JP7246545B2 - floor blower - Google Patents

Description

FIELD OF THE INVENTION The present invention relates to an annular heat exchanger for a floor duct and a floor duct equipped with the annular heat exchanger.
Specifically, an annular heat exchanger for a floor blowing device arranged in a radial air flow path toward the blowing port in a rear view of the blowing port of the floor blowing device, and an annular heat exchanger for the floor blowing device. It relates to a floor blower.

Floor blowers are installed on the floor and blow out the conditioned air supplied to the underfloor space to the above floor space to ensure the comfort of the above floor space in the vicinity of the installation location. Since there are individual differences in the sensation of coldness, as a countermeasure, the floor blower is equipped with an air volume adjustment damper. There is a floor blowing device which adjusts the blowing air volume of the blown regulated air, and responds to individual differences in sensation of heat and cold by adjusting the blowing air volume by adjusting the opening of the damper. (Patent document 1)

In addition, in a floor blower equipped with a blower fan, by adjusting the output of the blower fan, the amount of adjusted air blown out from the outlet of the floor blower into the space above the floor is adjusted. There is also a floor blower that adjusts the amount of blowing air to accommodate individual differences in sensations of heat and cold. (Patent document 2)

Japanese Unexamined Patent Application Publication No. 2004-205080 JP 2005-282917 A

However, since the adjusted air is blown out near the feet of the occupants, the occupants are more likely to feel the air draft with the floor air outlet than with the ceiling air outlet. The adjustment range is small and limited.

For this reason, the conventional floor blower, which blows the air from the underfloor space directly to the above floor space, may not be able to adequately respond to individual differences in sensation of heat or cold, even if the amount of blowing air is adjusted. In other words, there was a problem that the functionality of individual air conditioning was still low.

In view of this situation, the main object of the present invention is to effectively solve the above-mentioned problems through rational improvements to the floor blower.

A floor blowing device according to the present invention includes a case having a blowing outlet formed on the upper surface for blowing air from under the floor into an air-conditioned space and having a blowing fan inside, and an annular heat exchanger surrounding the case. In the floor blowing device, the annular heat exchanger includes an annular first heat transfer tube surrounding the case, an annular second heat transfer tube surrounding the case, and heat to the first heat transfer tube. a tapping unit having a first pipe connection for introducing a medium and a second pipe connection for discharging a heat medium from the second heat transfer tube, the tapping unit comprising: a first communication passage connecting the first pipe connection portion and the first heat transfer pipe; a second communication passage connecting the second heat transfer pipe and the second pipe connection portion; a third communication path connecting one heat transfer tube and the second heat transfer tube, a first partition partitioning the first communication path and the second communication path, and the first communication a second partition that partitions the passage and the third communication passage, the first pipe connection portion, the first communication passage, the first heat transfer tube, the third communication passage, The heat transfer medium is characterized in that the heat medium flows through the second heat transfer tube, the second communication path, and the second tube connecting portion in this order.

In this annular heat exchanger, the heat medium supplied to the first pipe connection portion flows through the first pipe connection portion, the first communication passage inside the tapping unit, the first heat transfer tube, the third heat transfer pipe inside the tapping unit. , the second heat transfer tube, the second communication path, and the second tube connecting portion inside the tapping unit in this order.

Therefore, in the floor blower equipped with this annular heat exchanger, the air that is sent from the underfloor space through the radial airflow path to the blowout port and is blown out from the blowout port to the above-floor space is radially distributed. In the process of passing through the air flow path, it is cooled or heated by exchanging heat with the heat medium flowing inside the heat transfer tubes arranged in the radial air flow path.

Therefore, compared to the conventional floor blowing equipment in which the air in the underfloor space is directly blown out to the above floor space, the heat or cold felt by the occupants in the above floor space near the installation location of the floor blowing equipment is blown out by the annular heat exchanger. Therefore, the amount of cooling or heating by the annular heat exchanger can be changed even for individual differences in the sensation of hotness or coldness of the occupants in the space above the floor. It is possible to respond more effectively by increasing the temperature, thereby effectively improving the functionality of the individual air conditioning.

Configuration diagram of the air conditioning system Top view of floor blower Cross-sectional view of an annular heat exchanger installed in a floor blower Perspective view of an annular heat exchanger Structural drawing of the tapping unit Diagram showing the flow of heat medium in the piping system during the cooling period A diagram showing the state of the heat medium flow in the piping system during the heating period Configuration diagram of a piping system showing another embodiment Cross-sectional view of an annular heat exchanger showing another embodiment Configuration diagram of an air conditioning system showing another embodiment

FIG. 1 shows an air-conditioning system in an air-conditioned room 1. A plurality of desks 2 are installed in the air-conditioned room 1, and a plurality of personnel (occupants) are present in the room.

On the ceiling 3 of the air-conditioned room 1, a plurality of ceiling blow-out fixtures 4 are installed in a dispersed state together with lighting fixtures and the like, and the space 5 behind the ceiling of the air-conditioned room 1 is a common supply for the plurality of ceiling blow-out fixtures 4. Used as an air chamber.

That is, the adjusted air SA whose temperature and humidity are adjusted by the separately installed air conditioner 6 is supplied to the air supply chamber 5 utilizing the space above the ceiling by the air supply fan 7 through the air supply duct 8, and is supplied to this air supply chamber 5. The adjusted air SA is blown into the air-conditioned room 1 from each ceiling blower 4 .

A system in which the air supply duct 8 from the air conditioner 6 is duct-connected to each ceiling blower 4 via a branch duct may be adopted.

A wall suction device 10 is installed on the room wall 9 of the air-conditioned room 1 , and a return air duct 11 extending from the wall suction device 10 is connected to a return air port of the air conditioner 6 .

That is, in parallel with the adjusted air SA being blown out from the ceiling blower 4, the indoor air RA in the air-conditioned room 1 is sucked into the wall suction device 10, and the air RA sucked into the wall suction device 10 is The air is returned to the air conditioner 6 through the return air duct 11 by the return air fan 12 .

A part of the air RA sucked into the wall suction device 10 is discharged to the outside as the discharged air EA through the exhaust duct 13 branched from the return air duct 11 for the purpose of ventilation of the air-conditioned room 1. .

The air RA returned to the return air port of the air conditioner 6 is mixed inside the air conditioner 6 with fresh air OA for ventilation (that is, outside air) taken into the air conditioner 6 from the outdoors through the outside air intake duct 14. , the temperature and humidity of the mixed air RA and OA are adjusted by the cooling coil 6a, the heating coil 6b, the humidifier 6C, and the like in the air conditioner 6. As shown in FIG.

The mixed air RA and OA whose temperature and humidity have been adjusted in the air conditioner 6 is fed again to the air supply chamber 5 through the air supply duct 8 as the adjusted air SA, and is blown out from the ceiling blower 4 into the air-conditioned room 1. .

The floor 15 of the air-conditioned room 1 has a so-called double-floor structure installed with a gap between it and the frame slab 16, and the underfloor space 17 between the floor 15 and the frame slab 16 serves as an underfloor chamber. It's being used.

A plurality of floor suction devices 18 are installed in a distributed state in the passage portion 15a of the floor 15, while a floor discharge device 19 is installed in the under-desk portion 15b of each desk 2 on the floor 15. As shown in FIG.

Each of the floor suction device 18 and the floor blower device 19 is installed on the floor 15 in such a manner that their upper surfaces are flush with the upper surface of the floor 15, and each floor blower device 19 is equipped with a blowout fan 20. Equipped.

That is, the air RA' in the under-floor space 17 is blown out to the under-desk space of each desk 2 through the floor blow-out device 19 by the operation of the blow-out fan 20 in each floor blow-out device 19 .

Further, as the blow-out fan 20 in each floor blow-out device 19 operates, the indoor air RA in the air-conditioned room 1 is taken into the underfloor space 17 through each floor suction device 18 in the passage portion 15a.

As shown in FIGS. 2 and 3, the floor blower 19 is equipped with an annular heat exchanger 22, and the air RA' drawn from the underfloor space 17 into each floor blower 19 by the operation of the blowout fan 20. is cooled or heated by the annular heat exchanger 22 to readjust its temperature, and this temperature-adjusted air RA' is discharged from the upper outlet portion 19a of the floor blower device 19 to the desk on the floor as the floor blowing air FA. It is blown out into the lower space.

The floor blowing device 19 has a basket-like case 19b, and a disk-shaped blowing port portion 19a having a large number of blowing holes a is attached to an opening on the upper surface side of the basket-like case 19b. The blowout fan 20 is installed inside the basket-like case 19b.

A plurality of air intakes 23 are formed in the peripheral surface of the cage-like case 19b, and when the blowout fan 20 inside the case is operated, the surrounding air RA' in the underfloor space 17 is By the suction function of the blowout fan 20, the intake air RA' is sucked into the basket-shaped case 19b through the air intake port 23, and this intake air RA' is made into the floor blowout air FA by the blowing function of the blowout fan 20, and the plurality of blowout holes a in the blowout port portion 19. It is blown out into the space under the desk above.

FIG. 4 shows an annular heat exchanger 22 installed in the floor blower 19. This annular heat exchanger 22 is positioned around the basket-like case 19b in the floor blower 19 (that is, when viewed from the rear with respect to the blowout port 19a). is arranged in a radial airflow path K) toward the outlet portion 19a.

The annular heat exchanger 22 includes two heat transfer tubes 24a, 24b and a tapping unit 25 to which these heat transfer tubes 24a, 24b are connected. It is formed in an annular bent shape surrounding the basket-like case 19b when viewed.

The two heat transfer tubes 24a and 24b are dispersed in the vertical direction (that is, the direction perpendicular to the blowout port 19a). The end on the outlet side is connected to each side of the tapping unit 25 .

In addition, to the front portion of the tapping unit 25, an inlet-side pipe connector 27a (an example of a first pipe connection portion) to which the heat medium supply pipe 26a is connected, and a heat medium return pipe 26b are connected. An outlet-side pipe connector 27b (which is an example of a second pipe connection portion) is provided.

As shown in FIG. 5, inside the tapping unit 25, there are a transition communication path rm (an example of a third communication path) and an inlet-side communication path ri (an example of a first communication path). and an outlet-side communication passage ro (an example of a second communication passage) are formed, and the two heat transfer tubes 24a and 24b are connected in series by a transfer communication passage rm.

In serial communication of the heat transfer tubes 24a and 24b, the heat medium inlet i of the heat transfer tube 24a located on the upstream side communicates with the pipe connector 27a on the inlet side through the inlet side communication path ri, and the pipe connector 27a located on the downstream side. The heat medium outlet o of the heat transfer tube 24b communicates with the pipe connector 27b on the outlet side through the outlet side communication passage ro.

The tapping unit 25 is formed of a box-shaped case 25a and a partition plate 25b (an example of a first partition and a second partition) provided inside the box-shaped case 25a, The transition communication path rm, the inlet side communication path ri, and the outlet side communication path ro inside the tapping unit 25 are formed by partitioning the inside of the box-shaped case 25a with the partition plate 25b.

The annular heat exchanger 22 has two plate-shaped base materials 28a and 28b, and these plate-shaped base materials 28a and 28b surround the blow-out port 19a of the floor blow-out device 19 when viewed from the rear. These two plate-like substrates 28a and 28b are formed in an annular shape, and are spaced apart from each other so as to form a radial air flow path K around the outer circumference of the basket-like case 19b.

A large number of heat transfer fins 29 are provided between the two plate-like substrates 28a and 28b, and these heat transfer fins 29 are arranged radially with respect to the outlet portion 19a of the floor blower device 19 when viewed from the rear. Each of these heat transfer fins 29 is connected to the plate-like substrates 28a and 28b so as to span between the plate-like substrates 28a and 28b.

Each of the heat transfer tubes 24a and 24b having an annular bent shape is installed in the annular heat exchanger 22 so as to pass through a large number of heat transfer fins 29 arranged radially. The plate-shaped base materials 28a and 28b are connected to the plate-shaped base materials 28a and 28b, respectively, at a part of the annular shape of the plate-shaped base materials 28a and 28b in the annular direction.

In addition, the bottom plate-shaped substrate which is the plate-shaped substrate on the side away from the blow-out port 19a in the direction perpendicular to the blow-out port 19a of the floor blower device 19 (that is, the lower side) among the plate-shaped base materials 28a and 28b 28b is closed by a closing plate 28c at the annular center hole portion of the bottom plate-shaped base material 28b.

Therefore, the closing plate 28c prevents the air RA' in the underfloor space 17 from being sucked into the basket-like case 19b through the central hole portion of the bottom plate-like base material 28b. Almost all of the sucked air RA' in the underfloor space 17 is sucked into the basket-like case 19b through the radial air flow paths K between the plate-like substrates 28a and 28b.

The bottom plate-shaped base material 28b may be formed as a disc-shaped member from the beginning instead of being formed as a separate member from the closing plate 28c.

In a state where the floor blower 19 is installed on the floor 15 of the air-conditioned room 1, the annular heat exchanger 22 is driven through the jack mechanism 30 interposed between the bottom plate-shaped base material 28 and the frame slab 16. It is supported by the building slab 16 .

FIG. 6 shows the piping system for the annular heat exchanger 22 installed in the floor bleed fixture 19 . The air conditioner 6 includes a cold water supply pipe 31a that supplies cold water C to the cooling coil 6a, and a return cold water CR that is sent out from the cooling coil 6a (that is, heat exchange with the air to be cooled in the cooling coil 6a to raise the temperature). A cold water return pipe 31b for guiding warmed cold water is connected.

Similarly, the air conditioner 6 includes a hot water supply pipe 32a that supplies hot water H to the heating coil 6b, and a return hot water HR sent from the heating coil 6b (that is, heat exchange with the air to be heated in the heating coil 6b). A hot water return pipe 32b is connected to guide the hot water whose temperature has been lowered by heating.

In the underfloor space 17, a common relay heat exchanger 33 for the plurality of floor blowing devices 19 is installed. A cold water outlet pipe 36a branched from the cold water outlet pipe 31a and a hot water outlet pipe 36b branched from the hot water outlet pipe 32a are connected to the heat medium feed pipe 35a on the primary side. ing.

A primary heat medium return pipe 35b is connected to the primary heat medium outlet 34b of the relay heat exchanger 33. The primary heat medium return pipe 35b is branched from the cold water return pipe 31b. The cold water return pipe 37a and the hot water return pipe 37b branched from the hot water return pipe 32b are connected.

A short-circuit pipe 38 is branched from the middle of the heat medium return pipe 35b on the primary side, and this short-circuit pipe 38 is connected to the middle point of the heat medium feed pipe 35a on the primary side.

The cold water outlet pipe 36a, the hot water outlet pipe 36b, the cold water return pipe 37a, and the hot water return pipe 37b are each provided with an on-off valve vk for switching between cooling and heating, and the short-circuit pipe 38 and the primary side heat medium feed pipe are interposed. 35a, a combined three-way valve vt for adjusting the temperature of the heat medium is interposed. A feed pump p1 is interposed.

A heat medium outlet 39a on the secondary side of the relay heat exchanger 33 is connected to a heat medium main pipe 40a on the going side, and a plurality of heat medium sending pipes 26a are branched from the heat medium main pipe 40a on the go side. These heat medium supply pipes 26a are individually connected to inlet side pipe connection portions 27a of the tapping units 25 in the annular heat exchangers 22 provided in the plurality of floor blowing devices 19, respectively.

Similarly, a return-side heat medium main pipe 40b is connected to a secondary-side heat medium inlet 39b in the relay heat exchanger 33, and a plurality of heat medium return pipes 26b are connected from the return-side heat medium main pipe 40b. are branched, and these heat medium return pipes 26b are individually connected to the outlet side pipe connection portions 27b of the tapping units 25 in the annular heat exchangers 22 provided in the plurality of floor blowing devices 19, respectively.

The heat medium main pipe 40a on the forward side is provided with a heat medium feed pump p2 on the secondary side and a heat medium temperature sensor 41. As shown in FIG.

This heat medium temperature sensor 41 measures the temperature t of the secondary side heat medium n delivered from the secondary side heat medium outlet 39a in the relay heat exchanger 33, and the confluence three-way valve vt for heat medium temperature adjustment is , the cold water C or hot water H taken out through the cold water take-out pipe 36a or the hot water take-out pipe 36b and the return cold water C' or return hot water H' flowing back through the shunt pipe 38 are merged and mixed, and the mixture ratio is determined as the heat medium. It automatically adjusts according to the measured temperature t of the temperature sensor 41 .

In this piping system, as shown in FIG. 6, the on-off valves vk interposed in the cold water take-out pipe 36a and the cold water return pipe 37a are opened, and the hot water take-out pipe 36b and the hot water take-out pipe 36b are opened. The on-off valves vk interposed in each of the hot water return pipes 37b are closed, thereby operating the heat medium feed pump p1 on the primary side. It is taken out as a medium through the cold water take-out pipe 36a.

The chilled water C taken out through the chilled water take-out pipe 36a is mixed with the return chilled water C' returned through the shunt pipe 38 at the confluence three-way valve vt. The heat medium inlet 34 a on the primary side of the relay heat exchanger 33 is supplied.

In the relay heat exchanger 33, the cold water C supplied to the primary side heat medium inlet 34a of the relay heat exchanger 33 is converted into the secondary side heat flowing into the relay heat exchanger 33 from the secondary side heat medium inlet 39b. heat exchange with the heat medium n (water in this example), and as the heat exchange cools the heat medium n on the secondary side, the heat of the primary side in the relay heat exchanger 33 rises. From the medium outlet 34b, the cooled water C' is returned to the heat medium return pipe 35b on the primary side.

Further, the mixing ratio of the cold waters C and C' is automatically adjusted according to the temperature t measured by the heat medium temperature sensor 41 at the confluence three-way valve vt, and the temperature of the cold water C supplied to the relay heat exchanger 33 is adjusted. As a result, the secondary-side heat medium n that has flowed into the relay heat exchanger 33 from the secondary-side heat-medium inlet 39b is cooled to the set heat-medium temperature ts in the cooling period in heat exchange with the cold water C, and is delivered to the heat medium main pipe 40a.

Therefore, in the cooling period, the low-temperature secondary heat medium n cooled to the set heat medium temperature ts in the cooling period is driven through the heat medium feed pipes 26a by the operation of the secondary heat medium feed pump p2. It is fed to the annular heat exchanger 22 of each floor blower 19 .

The low-temperature secondary heat medium n supplied to the annular heat exchanger 22 of each floor blower 19 cools the air RA' through heat exchange with the underfloor air RA' blown into the under-desk space. It is returned to the heat medium inlet 39b on the secondary side of the relay heat exchanger 33 through each of the heat medium return pipes 26b and the heat medium main pipe 40b on the return side as the return heat medium n in an elevated state.

A portion of the return chilled water C′ sent from the primary side heat medium outlet 34b in the relay heat exchanger 33 to the primary side heat medium return pipe 35b is returned to the confluence three-way valve vt through the short circuit pipe 38. , the other portion of the return cold water C' is returned to the cold water return pipe 31b through the cold water return pipe 37a.

On the other hand, in this piping system, as shown in FIG. 7, the on-off valves vk interposed in the hot water take-out pipe 36b and the hot water return pipe 37b are opened, and the cold water take-out pipe 36a is opened. and the cold water return pipe 37a are closed, and the heat medium feed pump p1 on the primary side is operated, whereby the hot water H in the hot water supply pipe 32a is transferred to the primary side. It is taken out as a heat medium through the hot water take-out pipe 36b.

The hot water H taken out through the hot water take-out pipe 36b is mixed with the returned hot water H' returned through the short-circuit pipe 38 at the confluence three-way valve vt. The heat medium inlet 34 a on the primary side of the relay heat exchanger 33 is supplied.

In the relay heat exchanger 33, the hot water H supplied to the primary side heat medium inlet 34a of the relay heat exchanger 33 is converted into the secondary side heat flowing into the relay heat exchanger 33 from the secondary side heat medium inlet 39b. Heat exchange with the heat medium n (water), and the temperature of the heat medium itself is lowered as the heat medium n on the secondary side is heated by this heat exchange, and is discharged from the heat medium outlet 34b on the primary side of the relay heat exchanger 33. It is sent out to the heat medium return pipe 35b on the primary side as return hot water H'.

Further, the mixing ratio of the hot water H and H' is automatically adjusted in the confluence three-way valve vt according to the temperature t measured by the heat medium temperature sensor 41, and the temperature of the hot water H supplied to the relay heat exchanger 33 is adjusted. As a result, the secondary-side heat medium n that has flowed into the relay heat exchanger 33 from the secondary-side heat medium inlet 39b is heated to the set heat medium temperature ts in the heating season in heat exchange with the hot water H, and is delivered to the heat medium main pipe 40a.

Therefore, in the heating season, the high-temperature secondary-side heat medium n heated to the set heat-medium temperature ts in the heating period is driven through each heat-medium supply pipe 26a by the operation of the secondary-side heat-medium feed pump p2. It is fed to the annular heat exchanger 22 of each floor blower 19 .

The high-temperature secondary heat medium n supplied to the annular heat exchanger 22 of each floor blower 19 heats the air RA' by heat exchange with the underfloor air RA' blown into the under-desk space. It is returned to the heat medium inlet 39b on the secondary side of the relay heat exchanger 33 through each of the heat medium return pipes 26b and the heat medium main pipe 40b on the return side as the return heat medium n.

A portion of the return hot water H' sent from the primary side heat medium outlet 34b of the relay heat exchanger 33 to the primary side heat medium return pipe 35b is returned to the confluence three-way valve vt through the short-circuit pipe 38. , the other portion of the return hot water H' is returned to the hot water return pipe 32b through the hot water return pipe 37b.

Each desk 2 in the air-conditioned room 1 is provided with a declaring device 42 that accepts declarations of "hot" or "cold" regarding the air-conditioning state. You can alternatively declare "hot" or "cold" for

A controller 43 is provided for centrally controlling all the floor blowers 19 in the air-conditioned room 1, and this controller 43 sends a report of "hot" to the reporter 42 of each desk 2. Then, the output of the blow-out fan 20 in the corresponding floor blow-out device 19 under the desk is increased by a predetermined adjustment range during the cooling period, and is decreased during the heating period, so that the corresponding floor blow-out device 19 blows into the under-desk space. The air volume Q of the air blown from the floor FA is increased by a predetermined adjusted air volume ΔQ during the cooling period, and is decreased during the heating period.

In addition, every time the controller 42 of each desk 2 declares that it is "cold", the controller 43 adjusts the output of the blow-out fan 20 of the floor blow-out device 19 under the corresponding desk by a predetermined adjustment width during the cooling period. during the heating period, and increased during the heating period to reduce the air volume Q of the floor blowing air FA blown out from the corresponding floor blowing device 19 into the space under the desk by a predetermined adjusted air volume ΔQ during the cooling period, and Increase during heating season.

That is, in the cooling period, the air obtained by further cooling the air RA′ in the underfloor space 17 by the ring-shaped heat exchanger 22 is blown out from the floor blowing device 19 into the under-desk space as floor blowing air FA. Compared to blowing the air RA' in the space directly under the desks, the cooling effect for each occupant using each desk 2 can be effectively enhanced.

Since the cooling effect for each occupant is effectively enhanced in this way, the adjustment range of the air volume Q is limited when adjusting the blowing air volume Q according to the occupant's self-declaration of "hot" or "cold". However, when the air RA′ in the underfloor space 17 is blown out as it is, compared to simply adjusting the amount of blown air, Since the amount of air cooling also increases or decreases accordingly, the cooling effect on the occupants can be effectively adjusted.

Similarly, during the heating period, air obtained by further heating the air RA′ in the underfloor space 17 with the annular heat exchanger 22 is blown out from the floor blower 19 into the space under the desk as floor blowing air FA. The heating effect for each occupant using each desk 2 can be effectively enhanced as compared with blowing the air RA' in 17 directly into the space under the desk.

Since the heating effect for each occupant is effectively enhanced in this way, the adjustment range of the air volume Q is limited in adjusting the blowing air volume Q according to the occupant's self-declaration of "hot" or "cold". However, when the air RA′ in the underfloor space 17 is blown out as it is, compared to simply adjusting the amount of blown air, Since the amount of air heating also increases or decreases accordingly, it is possible to effectively adjust the heating effect for the occupants.

Therefore, according to the air-conditioning system of this example, it is possible to effectively improve the function of individual air-conditioning aimed at coping with individual differences in sensations of heat and cold.

[Another embodiment]
Next, another embodiment of the present invention is listed.

In the above-described embodiment, an example is shown in which the relay heat exchanger 33 is provided in the piping system for the annular heat exchanger 22, but instead of this, the relay heat exchanger 33 is omitted, as shown in FIG. , the cold water C or hot water H mixed by the confluence three-way valve vt is directly supplied to each of the annular heat exchangers 22 as the heat medium r through a plurality of heat medium feed pipes 26a branched from the heat medium feed pipe 35a. may be made.

In addition, the heat medium r supplied to the annular heat exchanger 22 is not limited to cold water C or hot water H supplied to cold/hot water using equipment such as the air conditioner 6, but is sent out from cold/hot water using equipment such as the air conditioner 6. Any heat medium may be used, such as return cold water CR, return hot water HR, or condensed refrigerant that is evaporated and vaporized in the annular heat exchanger 22 .

As shown in FIG. 9, an annular chamber 45 with a duct connection 45a is provided, which is arranged around the outlet 19a of the floor outlet fixture 19 and in the annular heat exchanger 22. A side outlet 47 may be formed in the outer periphery of the floor blower 19 through which a portion of the cooled or heated air RA' is delivered to the interior of the annular chamber 45. As shown in FIG.

In this way, as shown in FIG. 10, for example, a floor blower 19 equipped with an annular chamber 45 is installed on the floor 15 in the space under the desk, and a hose-like air outlet connected to the duct connection portion 45a of the annular chamber 45 is installed. is connected to the partition portion 49 of the desk 2, whereby part of the underfloor air RA′ cooled or heated by the annular heat exchanger 22 is transferred to the upper surface of the floor blowout fixture 19 as the floor blowout air FA. The other part of the underfloor air RA′ cooled or heated by the annular heat exchanger 22 is blown out from the blow-out port 19a into the space under the desk, and passes through the air duct 48 and the internal air passage 49a of the partition part 49 to the partition. It can also be blown out from the individual outlet 49 b of the portion 49 .

In the above-described embodiment, the air heating amount per unit time in the annular heat exchanger 22 changes as the air volume Q of the floor blowing air FA blown from the floor blowing device 19 is adjusted. However, by adjusting the flow rate and temperature of the heat medium n supplied to the annular heat exchanger 22 to adjust the amount of air heated per unit time in the annular heat exchanger 22, the air is blown out from the floor blower 19 The temperature of the floor blown air FA may be adjusted.

When the temperature of the floor blowing air FA blown from the floor blower 19 is adjusted by adjusting the air heating amount per unit time in the annular heat exchanger 22, the floor blowing from the floor blower 19 is adjusted. The amount of blown air FA may be either variable or fixed.

In the above-described embodiment, the air RA′ cooled or heated by the annular heat exchanger 22 is blown out from the blow-out port 19a of the floor blow-out device 19 by the blow-out fan 20. Therefore, the air RA' in the underfloor space 17 may be blown out from the outlet portion 19a of the floor blower device 19 through the annular heat exchanger 22.

The air supplied to the underfloor space 17 to be blown out to the above-floor space through the floor blower 19 is not limited to the return air RA from the air-conditioned room 1, but may be regulated outside air whose humidity and temperature are adjusted by an outdoor air conditioner or an air conditioner. Alternatively, it may be conditioned air.
As an example, air whose humidity has been adjusted by an outdoor air conditioner is supplied from the ceiling to the air-conditioned room. It may be adjusted and supplied from the floor blower 19 to the air-conditioned room on the floor,
Alternatively, in parallel with supplying the air whose humidity has been adjusted by the outdoor air conditioner to the underfloor space, the temperature of the air supplied to the underfloor space is adjusted by the annular heat exchanger 22, and the air-conditioned room above the floor is supplied from the floor blower 19. You may make it blow-supply to .

Further, in order to supply air to the underfloor space 17, instead of supplying the air RA in the air-conditioned room 1 to the underfloor space 17 through the floor suction port 18 as shown in the above embodiment, You may make it supply to the space 17. FIG.

INDUSTRIAL APPLICABILITY The annular heat exchanger and the floor-blowing appliance according to the present invention can be used for floor-blowing air conditioning for living rooms for various purposes.

19 Floor blower 19a Blowout port K Radial air flow path 20 Blowout fan 22 Annular heat exchanger 24a, 24b Heat transfer tube 25 Tapping unit i Heat medium inlet o Heat medium outlet 26a Heat medium supply pipe 26b Heat medium return pipe 27a Inlet Side pipe connection part 27b Outlet side pipe connection part ri Inlet side communication path ro Outlet side communication path rm Crossover communication path 25a Box-shaped case 25b Partition plate 28a, 28b Plate-shaped base material 29 Heat transfer fin 28c Blocking plate 16 Frame slab (support body)
30 Jack mechanism RA' Air 20 Blow-out fan 47 Peripheral blow-out port (divided channel)
45a duct connection part 48 fan duct

Claims (5)

1. A floor blowing device comprising: a case having a blowing outlet formed on the upper surface for blowing air from under the floor into an air-conditioned space and having a blowing fan inside; and an annular heat exchanger surrounding the case,
The annular heat exchanger is
an annular first heat transfer tube surrounding the case;
an annular second heat transfer tube surrounding the case; and
a tapping unit formed with a first pipe connection portion for introducing a heat medium into the first heat transfer pipe and a second pipe connection portion for discharging a heat medium from the second heat transfer pipe; have
The tapping unit is
a first communication path that connects the first pipe connection portion and the first heat transfer pipe;
a second communication path that connects the second heat transfer tube and the second tube connection portion;
a third communication path connecting the first heat transfer tube and the second heat transfer tube;
a first partition that partitions the first communication path and the second communication path; and
a second partition that partitions the first communication path and the third communication path,
Said first pipe connection portion, said first communication passage, said first heat transfer pipe, said third communication passage, said second heat transfer pipe, said second communication passage, said second pipe connection portion A floor blowing device characterized in that the heat medium flows in the order of 2. The floor blower according to claim 1, wherein an intake is formed in the peripheral surface of said case, and air is taken into said case through said intake when said blow-out fan is driven. The annular heat exchanger includes two plate-shaped substrates, and heat transfer fins disposed between the two plate-shaped substrates for forming radial air paths around the case. 3. A floor blower according to claim 2, comprising: 4. The floor blowing device according to claim 3, wherein the first heat transfer pipe and the second heat transfer pipe are arranged so as to pass through the heat transfer fins. 5. The floor blowing device according to claim 4, wherein the first heat transfer pipe and the second heat transfer pipe are arranged vertically.

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