JP2009250585A - Total enthalpy heat exchange element and total enthalpy heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a total enthalpy heat exchange element having excellent humidity exchange efficiency. <P>SOLUTION: The total enthalpy heat exchange element 10 includes partition plates 1 and spacing plates 2 for holding spaces between the partition plates 1, and the partition plates 1 and the spacing plates are bonded to each other by a water borne pressure sensitive adhesive 3. The partition plate 1 includes a water soluble adsorbent and thickener, and the thickener is at least one type selected from a group comprising water soluble polyoxyethylene having 100,000 or more of weighted mean molecular weight, hydroxyethylcellulose and anionic polymer in which a counter ion is a lithium ion. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a total heat exchange element and a total heat exchanger that are used in an air conditioner, a ventilator, or the like and perform total heat exchange of latent heat and sensible heat between two airs having different temperatures and humidity.

  Conventionally, as shown in FIG. 1, there is a partition plate 1 and a spacing plate 2 that holds the spacing between the partition plates 1, and the total heat exchange in which the partition plate 1 and the spacing plate 2 are bonded with an adhesive 3 Element 10 is known. In this total heat exchange element 10, a first laminar air flow path 4 and a second laminar air flow path 5 orthogonal to the first laminar air flow path 4 are formed by the partition plate 1 and the spacing plate 2. The latent heat and sensible heat are exchanged between the first air 6 flowing through the first layered air flow path 4 and the second air 7 flowing through the second layered air flow path 5 using the partition plate 1 as a medium. The The total heat exchange element 10 is formed by applying an adhesive 3 to the tip of the spacing plate 2 in advance and bonding and integrating the partition plate 1 to form a unit structural member. The adhesive 3 can be applied to the substrate and stacked in a plurality of layers so that the direction of the spacing plate 2 is perpendicular to every other step.

Since the partition plate 1 serves as a medium for exchanging latent heat and sensible heat between the first air 6 and the second air 7, the heat transfer performance and moisture permeability performance of the partition plate 1 are the total heat exchange element 10. Greatly affects the exchange efficiency of sensible heat and latent heat. The moisture permeability of the partition plate 1 is preferably higher from the viewpoint of improving the latent heat exchange efficiency (humidity exchange efficiency). For the spacing plate 2, paper made of cellulose fiber (pulp) is generally used in consideration of cost.
From the viewpoint of imparting moisture permeability, the partition plate 1 generally contains a hygroscopic agent. As the moisture absorbent, water-soluble moisture absorbents such as deliquescent alkali metal salts typified by lithium chloride and calcium chloride, and alkaline earth metal salts are used. It has also been proposed to use a water-insoluble hygroscopic agent such as silica gel or a strong acid / base ion exchange resin (see, for example, Patent Documents 1, 2, and 3). Furthermore, it has also been proposed to use the water-soluble hygroscopic agent and a surfactant in combination (see, for example, Patent Document 4).
It has also been proposed that the partition plate 1 and the spacing plate 2 contain a flame retardant or the like from the viewpoint of ensuring fire safety.

In the total heat exchange element 10, in particular, it is required to reduce a permeation amount of a gas (for example, CO ₂ ) other than humidity (water vapor) between the first air 6 and the second air 7. Therefore, the partition plate 1 is required to have high gas shielding properties in addition to the above-described moisture permeability (moisture absorption) performance. Therefore, as the material of the partition plate 1 with improved gas shielding properties, finely beaten pulp fibers (see, for example, Patent Document 5), paper made by blending microfibrillated cellulose as a filler (for example, Patent Document) 6), a water-soluble resin such as polyvinyl alcohol is applied to the surface of the partition plate 1 (paper) to close the pores (see, for example, Patent Document 1), and a surfactant is applied to a microporous substrate. The thing which closed the hole (for example, refer patent document 7) etc. is proposed.

Moreover, in the adhesion part between the partition plate 1 and the space | interval board 2, when application | coating of the adhesive agent 3 is inadequate and a clearance gap exists between both plates, if air leaks from a clearance gap, another flow path will be carried out. Since CO _{2 and the} like leak when mixed with air, it is also required that no gap be formed.
As the adhesive 3, starch glue or vinyl acetate water-based adhesive used in cardboard molding is used. This is because when an organic solvent adhesive is used as the adhesive 3, the organic solvent itself remaining in the adhesive 3 is diffused, and the odor accompanying the radiation is generated, which is preferable as the total heat exchange element 10 for an air conditioner. This is because the production equipment for the total heat exchange element 10 requires complicated and expensive equipment such as an intake / exhaust device for explosion-proofing and organic solvent recovery, resulting in an increase in cost.

JP-A-4-25476 JP-A-10-153398 JP 2003-251133 A JP-A-8-233485 International Publication No. 2002/099193 Japanese Patent No. 3791726 JP 60-48498 A

  However, the total heat exchange element 10 using the partition plate 1 containing a water-soluble hygroscopic agent has a problem that the actual humidity exchange efficiency is lower than the expected humidity exchange efficiency. This is an inherent phenomenon that occurs when the partition plate 1 containing the water-soluble hygroscopic agent and the spacing plate 2 are bonded with a water-based adhesive. In order to elucidate the mechanism of this phenomenon, the present inventors conducted the following experiment.

A 5 cm square nonporous paper was immersed in a 2% by weight aqueous solution of cobalt chloride for 5 minutes, and then dried on a hot plate heated to 120 ° C., and the state was photographed every other minute (FIG. 2). Here, cobalt chloride is not a water-soluble hygroscopic agent, but it is easily dissolved in water like the water-soluble hygroscopic agent, and it turns blue in a dry atmosphere and red in a wet atmosphere, so that the dry state can be judged visually. For this reason, it was used in this experiment instead of the water-soluble moisture absorbent.
As a result, as shown in FIG. 2, the entire surface of the nonporous paper immediately after being immersed in the cobalt chloride aqueous solution is red (light color in FIG. 2), and blue (from dark in FIG. As the drying progresses, blue tint is generated on the paper surface, and it is found that the color at the edge where drying proceeds faster becomes darker.

Considering the mechanism of the above phenomenon based on the above experimental results, when the partition plate 1 and the spacing plate 2 are integrated with a water-based adhesive, the water of the water-based adhesive solvent is dried. The water-soluble hygroscopic agent in the central part of the slow partition plate 1 moves to the peripheral part of the fast partition plate 1 and decreases in concentration, and the moisture permeability of the partition plate 1 in that part decreases. It is thought that the humidity exchange efficiency has decreased.
Therefore, in order to maintain the moisture permeability of the partition plate 1, it is conceivable to include a large amount of a water-soluble moisture absorbent in the partition plate 1. However, the partition plate 1 absorbs and softens the heat during the production of the total heat exchange element 10. However, the handleability during the production is very poor, and the total heat exchange element 10 may not be produced.
In addition, it is conceivable to use a water-insoluble moisture absorbent as the moisture absorbent to be contained in the partition plate 1, but the water-insoluble moisture absorbent is poor in the effect of increasing the moisture permeability of the partition plate 1 compared to the water-soluble moisture absorbent. There is a problem that it is difficult to be contained in the partition plate 1 and the processing cost is increased.
On the other hand, when an organic solvent-based adhesive that does not dissolve the water-soluble hygroscopic agent is used for bonding the partition plate 1 and the spacing plate 2, there are problems with volatile organic compounds (VOC), odors, and production equipment as described above. appear.

  The present invention has been made to solve the above-described problems, and is contained in a partition plate when a partition plate containing a water-soluble moisture absorbent and a spacing plate are bonded with an aqueous adhesive. An object of the present invention is to provide a total heat exchange element and a total heat exchanger excellent in humidity exchange efficiency by preventing the water-soluble moisture absorbent from being unevenly distributed and suppressing a decrease in moisture permeability of the partition plate.

As a result of intensive studies to solve the above problems, the present inventors have included a specific thickener together with a water-soluble hygroscopic agent in the partition plate, thereby making the partition plate and the spacing plate into an aqueous adhesive. It has been found that the water-soluble moisture absorbent can be prevented from being unevenly distributed in the partition plate (particularly the central portion of the partition plate).
That is, the present invention is a total heat exchange element having a partition plate and a spacing plate for maintaining a spacing between the partition plates, and the partition plate and the spacing plate are bonded with an aqueous adhesive, The partition plate contains a water-soluble hygroscopic agent and a thickener, and the thickener has a weight-average molecular weight of 100,000 or more, water-soluble polyoxyethylene, hydroxyethyl cellulose, and the counter ion is a lithium ion. A total heat exchange element characterized in that it is at least one selected from the group consisting of anionic polymers.
Moreover, this invention comprises the said total heat exchange element, It is a total heat exchanger characterized by the above-mentioned.

  According to the present invention, when the partition plate containing the water-soluble hygroscopic agent and the spacing plate are bonded with the aqueous adhesive, the water-soluble hygroscopic agent contained in the partition plate is prevented from being unevenly distributed. By suppressing the decrease in moisture permeability, a total heat exchange element and a total heat exchanger excellent in humidity exchange efficiency can be provided.

Embodiment 1 FIG.
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view of the total heat exchange element of the present embodiment. In FIG. 1, the basic configuration of the total heat exchange element 10 is the same as that of a conventional total heat exchange element.
The total heat exchange element 10 has a partition plate 1 and a spacing plate 2 that keeps the spacing between the partition plates 1, and the partition plate 1 and the spacing plate 2 are bonded together with an adhesive 3. In this total heat exchange element 10, a first laminar air flow path 4 and a second laminar air flow path 5 orthogonal to the first laminar air flow path 4 are formed by the partition plate 1 and the spacing plate 2. The latent heat and sensible heat are exchanged between the first air 6 flowing through the first laminar air flow path 4 and the second air 7 flowing through the second air flow path 5 using the partition plate 1 as a medium. .

Partition plate 1 used in the present embodiment contains a water-soluble moisture absorbent and a thickener.
A water-soluble hygroscopic agent is a component which gives the effect which improves the moisture permeability of the partition plate 1, and will not be specifically limited if it is generally used in the said technical field. For example, a deliquescent alkali metal salt such as lithium chloride or a deliquescent alkaline earth metal salt such as calcium chloride or magnesium chloride can be used as the water-soluble moisture absorbent. From the viewpoint of increasing the moisture permeability of the partition plate 1 with a smaller content, lithium chloride is most preferred, followed by calcium chloride and then magnesium chloride.

  The thickener is formed by integrating the partition plate 1 and the spacing plate 2 with a water-based adhesive, and then water-soluble moisture absorption at the center of the partition plate 1 that is slow to dry when the water that is the solvent of the water-based adhesive dries. It is a component which gives the effect which prevents a moisture permeability fall of the partition plate 1 resulting from an agent moving to the peripheral part of the partition plate 1 which dries quickly, and reducing a density | concentration. Thickeners that provide such effects are polyoxyethylene, hydroxyethyl cellulose or anionic polymers. Among these, polyoxyethylene which is most excellent in the effect of preventing cost and moisture permeability reduction is preferable. Although hydroxyethyl cellulose is cheaper than polyoxyethylene, the effect of preventing a decrease in moisture permeability is slightly inferior. In addition, the anionic polymer has the same effect as that of polyoxyethylene in preventing moisture permeability reduction, but the cost is higher than that of polyoxyethylene. In addition, these thickeners can be used individually or in combination.

Polyoxyethylene is water-soluble and has a weight average molecular weight of 100,000 or more, preferably 1,000,000 or more. If the weight average molecular weight is less than 100,000, the effect of preventing the uneven distribution of the water-soluble hygroscopic agent cannot be obtained sufficiently. Further, those having no water solubility such as a water-insoluble polymer having a polyoxyethylene skeleton cannot obtain the above effects even if the weight average molecular weight is 100,000 or more.
In addition, some polyoxyethylenes are obtained by partially copolymerizing ethylene oxide with other alkylene oxides such as propylene oxide. The copolymerization of such other alkylene oxides has a weight average molecular weight. If it is 100,000 or more, the above-mentioned effect can be obtained in the same manner as the ethylene oxide homopolymer, but generally the hydrophilicity decreases and the moisture permeability of the partition plate 1 decreases as the content of other alkylene oxides increases. There is a tendency. Therefore, polyoxyethylene composed of a homopolymer of ethylene oxide is preferable.

  Hydroxyethyl cellulose is not particularly limited, and commercially available products can be used. Further, the higher the viscosity of the hydroxyethyl cellulose when it is made into an aqueous solution, the more preferable. Specifically, the viscosity of an aqueous solution containing 2% by mass of hydroxyethyl cellulose is preferably at least 1,000 mPa · s at 25 ° C. Furthermore, the average number of substitutions of hydroxyethylcellulose (average value of the number of hydroxyl groups of cellulose unit substituted with ethylene oxide) and the average number of moles of substitution (average number of moles of ethylene oxide added to the hydroxyl group of cellulose unit) In general, the average substitution number is 1.0 to 1.3, and the average substitution mole number is 1.8 to 2.5.

An anionic polymer has a lithium ion as a counter ion. Specifically, the anionic polymer is a polymer having a functional group such as carboxylic acid and sulfonic acid and having a counter ion of lithium ion. Among the anionic polymers, lithium polyacrylate, lithium polysulfonate, and lithium alginate are preferable from the viewpoint of moisture permeability and availability.
Similar to the hydroxyethyl cellulose, these anionic polymers are preferably those having a higher viscosity when made into an aqueous solution. Specifically, the viscosity of an aqueous solution containing 10% by mass of an anionic polymer is 200 mPa · s at 25 ° C. The above is preferable.

  The substrate of the partition plate 1 is not particularly limited as long as it is generally used in the technical field. For example, nonporous paper, resin film, cellulose fiber, nonwoven fabric such as polyolefin and polyester Porous substrates such as metal fibers and glass fibers can be used.

The method for containing the water-soluble hygroscopic agent and the thickener in the partition plate 1 is not particularly limited, and the thickener is added in the same manner as the known method for containing the water-soluble hygroscopic agent in the partition plate 1. What is necessary is just to use with a water-soluble moisture absorbent.
Specifically, the partition plate 1 containing a water-soluble moisture absorbent and a thickener is prepared by preparing an aqueous solution containing a water-soluble moisture absorbent and a thickener, and then applying the aqueous solution to the substrate of the partition plate 1. It can be produced by drying. In this method, an aqueous solution of a water-soluble hygroscopic agent and an aqueous solution of a thickener may be prepared separately, and each aqueous solution may be sequentially applied to the base material of the partition plate 1 and dried.
Moreover, when using paper as a base material of the partition plate 1, you may mix | blend a water-soluble moisture absorbent and a thickener at the time of papermaking.

The amount of the thickener contained in the partition plate 1 is preferably 0.5 g to ² g per 1 m ² of the partition plate 1 area. If the amount of the thickener is less than 0.5 g per 1 m ² of the partition plate 1, the effect of preventing the uneven distribution of the water-soluble moisture absorbent may not be obtained sufficiently. On the other hand, when the amount of the thickener exceeds ² g per 1 m ² of the partition plate 1, the effect of preventing the uneven distribution of the water-soluble moisture absorbent is obtained, but the moisture permeability of the partition plate 1 is reduced. There is.
Moreover, the amount of the water-soluble hygroscopic agent contained in the partition plate 1 is preferably 2 g or more, more preferably 4 g or more per 1 m ² of the partition plate 1 from the viewpoint of ensuring high moisture permeability. Moreover, since the water vapor transmission rate of the partition plate 1 becomes so large that the quantity of the water-soluble hygroscopic agent contained in the partition plate 1 is large, it is preferable that it is as much as possible from a viewpoint of water vapor transmission. However, the rate of increase in moisture permeability relative to the rate of increase in water-soluble hygroscopic agent contained in the partition plate 1 becomes moderate when the amount of the water-soluble hygroscopic agent exceeds 10 g per 1 m ² of the partition plate 1, and 20 g If it exceeds, it will be extremely small. Therefore, the amount of the water-soluble hygroscopic agent contained in the partition plate 1 is preferably 20 g or less, more preferably 10 g or less per 1 m ² area of the partition plate 1 in consideration of the cost and the effect on moisture permeability.

The partition plate 1 is required to have a gas shielding property in order to exchange latent heat and sensible heat without mixing gas between intake and exhaust. As a measure of the gas shielding property of the partition plate 1, in the measurement of the air permeability according to JIS P8117, the time required for 100 cm ³ of air to pass through the partition plate 1 having an area of 642 mm ² needs to be 5000 seconds or more. It is said. In order to obtain this air permeability, a hydrophilic resin may be applied to the partition plate 1. Further, from the viewpoint of improving the flame retardancy of the partition plate 1, a flame retardant may be contained in the partition plate 1.
The thickness of the partition plate 1 may be set as appropriate according to the size of the heat exchanger 10 to be produced, and is not particularly limited, but is generally 10 to 100 μm. When the thickness of the partition plate 1 is less than 10 μm, strength and gas shielding properties may be deteriorated. Moreover, when the thickness of the partition plate 1 exceeds 100 μm, desired moisture permeability may not be obtained.

The space plate 2 is not particularly limited as long as the space between the partition plates 1 can be kept constant, and a space plate generally used in the technical field can be used. For example, as the spacing plate 2, processed paper, other paper, resin, or the like can be used. Further, the spacing plate 2 can contain a flame retardant and the water-soluble moisture absorbent. The size of the spacing plate 2 is the same as that of the partition plate 1 in FIG. There is no particular limitation as long as it is not impaired.
Although the shape of the space | interval board 2 is corrugated in FIG. 1, if the effect of this invention is not impaired, it will not specifically limit.
Although the thickness of the space | interval board 2 will not be specifically limited unless the effect of this invention is impaired, Generally it is 50-200 micrometers.

  The adhesive 3 is not particularly limited as long as it is a water-based adhesive using water as a solvent, and those commonly used in the technical field can be used. As such an adhesive 3, for example, resin-based (vinyl acetate, vinyl acetate-acrylic acid ester copolymer system, ethylene-vinyl acetate copolymer (EVA) system, acrylic-vinyl acetate system, etc.) emulsion dispersion Examples thereof include mold adhesives, water-soluble polymer resins such as polyvinyl alcohol (PVA) and polyacrylic acid (PAA), and starch paste. These can be used alone or in combination.

Next, a method for manufacturing the total heat exchange element 10 will be described.
First, one partition plate 1 and one spacing plate 2 are bonded using the adhesive 3 by a corrugating machine to produce a unit structure member 10a as shown in FIG. Here, the expanded sectional view of the adhesion part between the partition plate 1 and the space | interval board 2 is shown in FIG. As shown in FIG. 4, the adhesive 3 is applied only to the pointed portion (ridge) of the spacing plate 2 using a roll coater, and the spacing plate 2 and the partition plate 1 are bonded and integrated.
Next, after applying the adhesive 3 to the pointed portion (ridge portion) of the interval plate 2 of the unit structural member 10a using a roll coater, another unit structural member 10a is rotated 90 ° to be overlapped and bonded. And the total heat exchange element 10 as shown in FIG. 1 can be manufactured by repeating this operation several times.
The total heat exchange element 10 manufactured in this way has the water-soluble moisture absorption contained in the partition plate 1 when the partition plate 1 containing the water-soluble moisture absorbent and the spacing plate 2 are bonded together with the adhesive 3. Since the uneven distribution of the agent can be prevented and the moisture permeability reduction of the partition plate 1 can be suppressed, the humidity exchange efficiency is excellent.

Embodiment 2. FIG.
FIG. 5 is a perspective view of the total heat exchanger 100 incorporating the total heat exchange element 10 according to Embodiment 1 with the top plate 101a removed. In FIG. 5, the total heat exchange element 10 is accommodated in a rectangular parallelepiped casing 101 having a removable top plate 101 a. An air inlet 104 and an air outlet 106 on the indoor side are provided on one of the opposing side surfaces of the housing 101, and an air inlet 105 and an air outlet 107 on the outdoor side are provided on the other side. The suction port 104 and the air outlet 107 and the air inlet 105 and the air outlet 106 are communicated with each other by a detachable exhaust passage 108 and an air supply passage 109 accommodated in the housing 101.
A blower 110 including an impeller 121, an electric motor 126, and a casing 211 is installed in the exhaust passage 108, and the indoor air is exhausted from the blowout port 107 to the outside. A blower 111 including an impeller 121, an electric motor 126, and a casing 211 is installed in the air supply passage 109, and outdoor air is supplied into the room through the air outlet 106.

The total heat exchange element 10 is inserted from an insertion port 115 provided on the other side surface of the housing 101, and the first layered air flow path 4 (see FIG. 1) is communicated with the exhaust flow path 108, thereby The stratified air channel 5 (see FIG. 1) is installed in the middle of the exhaust channel 108 and the supply channel 109 so as to communicate with the intake channel 109. After insertion of the total heat exchange element 10, the insertion port 115 is closed with a lid 115a.
When each of the blowers 110 and 111 is operated, the indoor air is sucked from the indoor suction port 104 through a duct (not shown) as indicated by an arrow A, and the first layer of the exhaust flow path 108 and the total heat exchange element 10 is drawn. It passes through the air flow path 4 as indicated by an arrow B, and is exhausted to the outside as indicated by an arrow C from an outlet 107 on the outdoor side by an exhaust fan 110.
Further, the air is sucked from the outdoor suction port 105 through a duct (not shown) as indicated by an arrow D, passes through the air supply passage 109 and the second layered air flow path 5 of the total heat exchange element 10 as indicated by an arrow E, The air supply blower 111 blows out the air outlet 106 on the indoor side as indicated by an arrow F and supplies the air into the room through a duct (not shown). At this time, in the total heat exchange element 10, the exhaust air flow B (first air 6; see FIG. 1) and the supply air flow E (second air 7; see FIG. 1) are all interposed via the partition plate 1. Heat exchange is performed, and exhaust heat is collected to reduce the heating and cooling load.
Since the total heat exchanger 100 includes the total heat exchange element 10 having excellent humidity exchange efficiency, the humidity exchange efficiency of the total heat exchanger 100 is also improved.

EXAMPLES Hereinafter, although an Example demonstrates the detail of this invention, this invention is not limited by these.
The humidity exchange efficiency evaluated in the examples and comparative examples was evaluated by manufacturing total heat exchange elements of the same size and measuring them under the same test conditions (environmental conditions, airflow conditions, measurement conditions, etc.).
In order to measure the difference in humidity exchange efficiency in a high humidity environment and a low humidity environment, a condition conforming to the exchange efficiency measurement condition (summer condition) of JIS B8628 (total heat exchanger) is used as a high humidity environment. It measured using the conditions based on the exchange efficiency measurement conditions (cooling conditions) of ARI (American air-conditioning refrigeration association) 1060-RATING AIR-TO-AIR ENERGY RECOVERY VENTIRATION EQUIIPMENT as a low humidity environment. In each figure shown below, what was measured under the former condition is denoted as “JIS”, and what was measured under the latter condition is denoted as “ARI”.

Example 1
For the base material of the partition plate, a processed paper having a thickness of 25 μm, a basis weight of 22 g / m ² , and an air permeability measured in accordance with JIS P8117 of 5000 seconds or more is used. As the thickener, polyoxyethylene having a weight average molecular weight of 1,000,000 was used. The partition plate was prepared by preparing an aqueous solution containing LiCl and polyoxyethylene, and then applying the aqueous solution to a substrate and drying it. In the partition plate, the content of the water-soluble moisture absorbent and 4g / m ^2, the content of the thickener was varied in the range of 0~3g / m ^2.
As the spacing plate, white glossy high-quality paper having a weight of 40 g / m ² and a thickness of 100 μm was used.
As the water-based adhesive, a vinyl acetate emulsion adhesive (solid content 40%) was used.
After applying a water-soluble adhesive to the tip of the spacing plate using a roll coater, the spacing plate and the partition plate were bonded and integrated, and dried at 80 ° C. for 1 hour to obtain a unit structure member. Next, after applying a water-soluble adhesive to the tip of the interval plate of the unit structure member using a roll coater, another unit structure member was rotated 90 ° and overlapped, and dried at 80 ° C. for 1 hour. By repeating this operation a plurality of times, a total heat exchange element was produced.

The total heat exchange element thus obtained was measured for humidity exchange efficiency. The result is shown in FIG.
As shown in FIG. 6, high humidity exchange efficiency was obtained when the content of the thickener in the partition plate was in the range of 0.5 to 2.0 g / m ² . In particular, the humidity exchange efficiency (ARI) in a low-humidity environment is significant between the case where the content of the thickener in the partition plate is in the range of 0.5 to 2.0 g / m ^{2 and} the case where it is out of the range. There was a big difference.

(Example 2)
A total heat exchange element was obtained in the same manner as in Example 1 except that polyoxyethylene having a weight average molecular weight of 100,000 was used instead of polyoxyethylene having a weight average molecular weight of 1,000,000 as a thickener. Produced.
The total heat exchange element thus obtained was measured for humidity exchange efficiency. The result is shown in FIG.
As shown in FIG. 7, high humidity exchange efficiency was obtained when the content of the thickener in the partition plate was in the range of 0.5 to 2.0 g / m ² . In particular, the humidity exchange efficiency (ARI) in a low-humidity environment is significant between the case where the content of the thickener in the partition plate is in the range of 0.5 to 2.0 g / m ^{2 and} the case where it is out of the range. There was a big difference.

(Example 3)
A total heat exchange element was produced in the same manner as in Example 2 except that CaCl ₂ was used instead of LiCl as the water-soluble moisture absorbent.
The total heat exchange element thus obtained was measured for humidity exchange efficiency. The result is shown in FIG.
As shown in FIG. 8, high humidity exchange efficiency was obtained when the content of the thickener in the partition plate was in the range of 0.5 to 2.0 g / m ² . In particular, the humidity exchange efficiency (ARI) in a low-humidity environment is significant between the case where the content of the thickener in the partition plate is in the range of 0.5 to 2.0 g / m ^{2 and} the case where it is out of the range. There was a big difference.

Example 4
A total heat exchange element was produced in the same manner as in Example 1 except that hydroxyethyl cellulose (HEC) was used in place of polyoxyethylene having a weight average molecular weight of 1,000,000 as a thickener. Here, HEC having an aqueous solution containing 2% by mass of HEC having a viscosity of 1000 mPa · s at 25 ° C. was used.
The total heat exchange element thus obtained was measured for humidity exchange efficiency. The result is shown in FIG.
As shown in FIG. 9, high humidity exchange efficiency was obtained when the content of the thickener in the partition plate was in the range of 0.5 to 2.0 g / m ² . In particular, the humidity exchange efficiency (ARI) in a low-humidity environment is significant between the case where the content of the thickener in the partition plate is in the range of 0.5 to 2.0 g / m ^{2 and} the case where it is out of the range. There was a big difference.

(Example 5)
A total heat exchange element was produced in the same manner as in Example 1 except that hydroxyethyl cellulose (HEC) was used in place of polyoxyethylene having a weight average molecular weight of 1,000,000 as a thickener. Here, HEC having an aqueous solution containing 2% by mass of HEC having a viscosity of 5,000 mPa · s at 25 ° C. was used.
The total heat exchange element thus obtained was measured for humidity exchange efficiency. The result is shown in FIG.
As shown in FIG. 10, high humidity exchange efficiency was obtained when the content of the thickener in the partition plate was in the range of 0.5 to 2.0 g / m ² . In particular, the humidity exchange efficiency (ARI) in a low-humidity environment is significant between the case where the content of the thickener in the partition plate is in the range of 0.5 to 2.0 g / m ^{2 and} the case where it is out of the range. There was a big difference.

(Example 6)
Total heat exchange was carried out in the same manner as in Example 1 except that lithium polyacrylate having a weight average molecular weight of 500,000 was used instead of polyoxyethylene having a weight average molecular weight of 1,000,000 as a thickener. An element was produced. Here, a lithium polyacrylate having a viscosity of 1,800 mPa · s at 25 ° C. in an aqueous solution containing 10% by mass of lithium polyacrylate was used.
The total heat exchange element thus obtained was measured for humidity exchange efficiency. The result is shown in FIG.
As shown in FIG. 11, high humidity exchange efficiency was obtained when the content of the thickener in the partition plate was in the range of 0.5 to 2.0 g / m ² . In particular, the humidity exchange efficiency (ARI) in a low-humidity environment is significant between the case where the content of the thickener in the partition plate is in the range of 0.5 to 2.0 g / m ^{2 and} the case where it is out of the range. There was a big difference.

(Example 7)
Except that polyoxyethylene having a weight average molecular weight of 1,000,000 was used as the thickener, lithium polystyrene sulfonate having a weight average molecular weight of 1,200,000 was used. A heat exchange element was produced. As the polystyrene lithium sulfonate, an aqueous solution containing 10% by mass of lithium polystyrene sulfonate having a viscosity of 200 mPa · s at 25 ° C. was used.
The total heat exchange element thus obtained was measured for humidity exchange efficiency. The result is shown in FIG.
As shown in FIG. 12, high humidity exchange efficiency was obtained when the content of the thickener in the partition plate was in the range of 0.5 to 2.0 g / m ² . In particular, the humidity exchange efficiency (ARI) in a low-humidity environment is significant between the case where the content of the thickener in the partition plate is in the range of 0.5 to 2.0 g / m ^{2 and} the case where it is out of the range. There was a big difference.

(Example 8)
A total heat exchange element was produced in the same manner as in Example 1 except that lithium alginate having a polymerization degree of 650 was used instead of polyoxyethylene having a weight average molecular weight of 1,000,000 as a thickener. As the lithium alginate, an aqueous solution containing 1% by mass of lithium alginate having a viscosity of 1,000 mPa · s at 25 ° C. was used.
The total heat exchange element thus obtained was measured for humidity exchange efficiency. The result is shown in FIG.
As shown in FIG. 13, high humidity exchange efficiency was obtained when the content of the thickener in the partition plate was in the range of 0.5 to 2.0 g / m ² . In particular, the humidity exchange efficiency (ARI) in a low-humidity environment is significant between the case where the content of the thickener in the partition plate is in the range of 0.5 to 2.0 g / m ^{2 and} the case where it is out of the range. There was a big difference.

(Comparative Example 1)
A total heat exchange element in the same manner as in Example 1 except that polyoxyethylene having a weight average molecular weight of 1,000 was used instead of polyoxyethylene having a weight average molecular weight of 1,000,000 as a thickener. Was made.
The total heat exchange element thus obtained was measured for humidity exchange efficiency. The result is shown in FIG.
As shown in FIG. 14, even if the thickener is included in the partition plate, the effect of improving the humidity exchange efficiency is not seen, and conversely, the humidity exchange efficiency decreases as the content of the thickener increases. .
As can be seen from this result, even if the thickener used is polyoxyethylene, when the weight average molecular weight is less than 100,000, the effect of improving the humidity exchange efficiency cannot be obtained. The weight average molecular weight must be 100,000 or more.

(Comparative Example 2)
A total heat exchange element in the same manner as in Example 1 except that polyoxyethylene having a weight average molecular weight of 10,000 was used instead of polyoxyethylene having a weight average molecular weight of 1,000,000 as a thickener. Was made.
The total heat exchange element thus obtained was measured for humidity exchange efficiency. The result is shown in FIG.
As shown in FIG. 15, even if the thickener is included in the partition plate, the effect of improving the humidity exchange efficiency is not seen. Conversely, the humidity exchange efficiency decreases as the content of the thickener increases. .
As can be seen from this result, even if the thickener used is polyoxyethylene, when the weight average molecular weight is less than 100,000, the effect of improving the humidity exchange efficiency cannot be obtained. The weight average molecular weight must be 100,000 or more.

(Comparative Example 3)
As a thickener, a block copolymer of ethylene oxide (EO) and propylene oxide (PO) instead of polyoxyethylene having a weight average molecular weight of 1,000,000 (weight average molecular weight 3000, EO / PO = 70 / 30 (mass ratio)) was used in the same manner as in Example 1 to produce a total heat exchange element.
The total heat exchange element thus obtained was measured for humidity exchange efficiency. The result is shown in FIG.
As shown in FIG. 16, even if the thickener is contained in the partition plate, the effect of improving the humidity exchange efficiency is not seen. Conversely, the humidity exchange efficiency decreases as the content of the thickener increases. .
As can be seen from this result, even if the thickener used is polyoxyethylene, when the weight average molecular weight is less than 100,000, the effect of improving the humidity exchange efficiency cannot be obtained. The weight average molecular weight must be 100,000 or more.

(Comparative Example 4)
A total heat exchange element in the same manner as in Example 1 except that polyoxyethylene having a weight average molecular weight of 50,000 was used instead of polyoxyethylene having a weight average molecular weight of 1,000,000 as a thickener. Was made.
The total heat exchange element thus obtained was measured for humidity exchange efficiency. The result is shown in FIG.
As shown in FIG. 17, even when the thickener is included in the partition plate, the effect of improving the humidity exchange efficiency is not seen, and conversely, the humidity exchange efficiency decreases as the content of the thickener increases. .
As can be seen from this result, even if the thickener used is polyoxyethylene, when the weight average molecular weight is less than 100,000, the effect of improving the humidity exchange efficiency cannot be obtained. The weight average molecular weight must be 100,000 or more.

(Comparative Example 5)
As in the case of Example 1, except that polyvinyl alcohol having a polymerization degree of 2,400 and a saponification degree of 98 mol% was used in place of polyoxyethylene having a weight average molecular weight of 1,000,000 as a thickener. A total heat exchange element was produced. As the polyvinyl alcohol, an aqueous solution containing 10% by mass of polyvinyl alcohol having a viscosity of 3,000 mPa · s at 25 ° C. was used.
The total heat exchange element thus obtained was measured for humidity exchange efficiency. The result is shown in FIG.
As shown in FIG. 18, even when the thickener is contained in the partition plate, the effect of improving the humidity exchange efficiency is not seen, and conversely, the humidity exchange efficiency decreases as the content of the thickener increases. .
As can be seen from this result, even if the thickener used is a water-soluble polymer, the effect of improving the humidity exchange efficiency cannot be obtained in the case of polyvinyl alcohol. Therefore, among the water-soluble polymers, hydroxyethyl cellulose is used as the thickener. Must be used.

(Comparative Example 6)
Total heat exchange was performed in the same manner as in Example 1 except that sodium polyacrylate having a weight average molecular weight of 500,000 was used in place of polyoxyethylene having a weight average molecular weight of 1,000,000 as a thickener. An element was produced.
The total heat exchange element thus obtained was measured for humidity exchange efficiency. The result is shown in FIG.
As shown in FIG. 19, the effect of improving the humidity exchange efficiency was not observed even when the thickener was included in the partition plate.
As can be seen from this result, when the counter ion of the anionic polymer used as the thickener is sodium ion, the effect of improving the humidity exchange efficiency cannot be obtained, so the counter ion of the anionic polymer must be lithium ion. Don't be.

(Comparative Example 7)
Except for using polystyrene sulfonate having a weight average molecular weight of 1,200,000 instead of polyoxyethylene having a weight average molecular weight of 1,000,000 as a thickener, A heat exchange element was produced.
The total heat exchange element thus obtained was measured for humidity exchange efficiency. The result is shown in FIG.
As shown in FIG. 20, the effect of improving the humidity exchange efficiency was not observed even when the thickener was included in the partition plate.
As can be seen from this result, when the counter ion of the anionic polymer used as the thickener is sodium ion, the effect of improving the humidity exchange efficiency cannot be obtained, so the counter ion of the anionic polymer must be lithium ion. Don't be.

(Comparative Example 8)
A total heat exchange element was produced in the same manner as in Example 1 except that sodium alginate having a polymerization degree of 650 was used as a thickener instead of polyoxyethylene having a weight average molecular weight of 1,000,000.
The total heat exchange element thus obtained was measured for humidity exchange efficiency. The result is shown in FIG.
As shown in FIG. 21, the effect of improving the humidity exchange efficiency was not observed even when the thickener was included in the partition plate.
As can be seen from this result, when the counter ion of the anionic polymer used as the thickener is sodium ion, the effect of improving the humidity exchange efficiency cannot be obtained, so the counter ion of the anionic polymer must be lithium ion. Don't be.

(Comparative Example 9)
As a thickener, a hydrophilic polyurethane resin (polyethylene glycol) obtained by mixing and curing polymeric diphenylmethane diisocyanate, butanediol, polyoxyethylene, and polytetramethylene glycol in place of polyoxyethylene having a weight average molecular weight of 1,000,000. A total heat exchange element was produced in the same manner as in Example 1 except that the oxyethylene content was 50% by mass.
The total heat exchange element thus obtained was measured for humidity exchange efficiency. The result is shown in FIG.
As shown in FIG. 22, even if the thickener is included in the partition plate, the effect of improving the humidity exchange efficiency is not seen. Conversely, the humidity exchange efficiency decreases as the content of the thickener increases. .
As can be seen from this result, even if a hydrophilic polyurethane resin is used, the effect of improving the humidity exchange efficiency cannot be obtained. Therefore, in order to obtain the effect of improving the humidity exchange efficiency, a specific thickener must be used.

  As can be seen from the above results, the total heat exchange element of the present invention has a water-soluble moisture-absorbing material contained in the partition plate when the partition plate containing the water-soluble moisture-absorbing agent and the spacing plate are bonded with an aqueous adhesive. Since the uneven distribution of the agent can be prevented and the moisture permeability reduction of the partition plate can be suppressed, the humidity exchange efficiency is excellent.

It is a perspective view of a total heat exchange element. It is a photograph which shows the dry condition of the nonporous paper immersed in the cobalt chloride aqueous solution. It is a perspective view of the unit structural member of a total heat exchange element. It is an expanded sectional view of the adhesion part between a partition plate and a space plate. It is a perspective view of the state which removed the top plate of the total heat exchanger. It is a graph which shows the relationship between content of the thickener in the partition plate of Example 1, and humidity exchange efficiency. It is a graph which shows the relationship between content of the thickener in the partition plate of Example 2, and humidity exchange efficiency. It is a graph which shows the relationship between content of the thickener in the partition plate of Example 3, and humidity exchange efficiency. It is a graph which shows the relationship between content of the thickener in the partition plate of Example 4, and humidity exchange efficiency. It is a graph which shows the relationship between content of the thickener in the partition plate of Example 5, and humidity exchange efficiency. It is a graph which shows the relationship between content of the thickener in the partition plate of Example 6, and humidity exchange efficiency. It is a graph which shows the relationship between content of the thickener in the partition plate of Example 7, and humidity exchange efficiency. It is a graph which shows the relationship between content of the thickener in the partition plate of Example 8, and humidity exchange efficiency. It is a graph which shows the relationship between content of the thickener in the partition plate of the comparative example 1, and humidity exchange efficiency. It is a graph which shows the relationship between content of the thickener in the partition plate of the comparative example 2, and humidity exchange efficiency. It is a graph which shows the relationship between content of the thickener in the partition plate of the comparative example 3, and humidity exchange efficiency. It is a graph which shows the relationship between content of the thickener in the partition plate of the comparative example 4, and humidity exchange efficiency. It is a graph which shows the relationship between content of the thickener in the partition plate of the comparative example 5, and humidity exchange efficiency. It is a graph which shows the relationship between content of the thickener in the partition plate of the comparative example 6, and humidity exchange efficiency. It is a graph which shows the relationship between content of the thickener in the partition plate of the comparative example 7, and humidity exchange efficiency. It is a graph which shows the relationship between content of the thickener in the partition plate of the comparative example 8, and humidity exchange efficiency. It is a graph which shows the relationship between content of the thickener in the partition plate of the comparative example 9, and humidity exchange efficiency.

Explanation of symbols

  1 partition plate, 2 spacing plate, 3 adhesive, 4 first layered air flow path, 5 second layered air flow path, 6 first air, 7 second air, 10 total heat exchange element, 10a unit Structural member, 100 Total heat exchanger, 101a Top plate, 101 Housing, 104, 105 Suction port, 106, 107 Air outlet, 108 Exhaust flow channel, 109 Air supply channel, 110 Blower, 111 Blower, 115 Insertion port, 115a Lid, 121 impeller, 126 electric motor, 211 casing.

Claims (4)

A total heat exchange element having a partition plate and a spacing plate for maintaining a spacing between the partition plates, wherein the partition plate and the spacing plate are bonded with a water-based adhesive;
The partition plate contains a water-soluble hygroscopic agent and a thickener, and the thickener has a weight-average molecular weight of 100,000 or more, water-soluble polyoxyethylene, hydroxyethyl cellulose, and the counter ion is a lithium ion. A total heat exchange element, which is at least one selected from the group consisting of   2. The total heat exchange element according to claim 1, wherein the anionic polymer is at least one selected from the group consisting of lithium polyacrylate, lithium polysulfonate, and lithium alginate. Content of the said thickener in the said partition plate is 0.5-2g / m < ² >, The total heat exchange element of Claim 1 or 2 characterized by the above-mentioned.   A total heat exchanger comprising the total heat exchange element according to claim 1.

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