CN111306658A - Defrosting method of dehumidifier - Google Patents
Defrosting method of dehumidifier Download PDFInfo
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- CN111306658A CN111306658A CN202010149964.8A CN202010149964A CN111306658A CN 111306658 A CN111306658 A CN 111306658A CN 202010149964 A CN202010149964 A CN 202010149964A CN 111306658 A CN111306658 A CN 111306658A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
- F24F3/1405—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification in which the humidity of the air is exclusively affected by contact with the evaporator of a closed-circuit cooling system or heat pump circuit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/01—Timing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a defrosting method of a dehumidifier, which comprises the steps of detecting the temperature condition of a first heat exchanger in real time within a period of time, comparing the temperature condition with a preset temperature, comparing the average temperature of the first heat exchanger before v minutes and the average temperature of the first heat exchanger before w minutes with the average temperature Tna obtained in real time twice, judging the state needing defrosting as long as one temperature comparison meets the preset requirement, starting defrosting, stopping a fan at first in the defrosting process, ensuring that the fan continuously supplies air, and then dehumidifying through a second heat exchanger, so as to obtain the effect of realizing dehumidification at the initial stage of defrosting.
Description
Technical Field
The invention relates to the technical field of dehumidifiers, in particular to a defrosting method of a dehumidifier.
Background
The dehumidifier is also called dehumidifier, drier and dehumidifier, generally divided into two categories of civil dehumidifier and industrial dehumidifier, belonging to one part of air-conditioning family. Generally, a conventional dehumidifier is composed of a compressor, a heat exchanger, a fan, a water container, a cabinet, and a controller.
The working principle is as follows: the wet air is pumped into the machine by a fan and passes through a heat exchanger, water molecules in the air are condensed into water drops, the treated dry air is discharged out of the machine, and the indoor humidity is kept at the proper relative humidity by circulation.
Therefore, with the expansion of the application range of dehumidifier products, the dehumidifier is also applied to some areas of high latitude in europe, north america and the like, in these areas, because the dehumidifier is mostly at medium and low temperature, the air dew point temperature is close to zero or even lower than zero, when the dehumidifier runs for a period of time, the surface of the evaporator is easy to frost and form ice, at this time, a defrosting action needs to be executed, the defrosting of the existing dehumidifier judges whether the dehumidifier needs defrosting by detecting the single pipe temperature of the evaporator, the pipe temperature of the evaporator can only judge that the pipe temperature of the evaporator is below 0 ℃, the frosting condition can occur, and the defrosting action is executed after the preset time, therefore, the dehumidifier can not be accurately detected under the frosting condition, and the defrosting quantity at this time enters the defrosting stage after being attenuated for a period of time, and the dehumidification capacity is not beneficial to maximization, and the energy waste is serious because the dehumidification is carried out under the frosting condition, and the whole dehumidification is forcibly cut off to reduce the dehumidification efficiency in the defrosting process at present, so that the defrosting starting time selection is not accurate in the conventional defrosting method, the dehumidification effect is poor, the energy waste is serious, the defrosting can not be carried out maximally, and the dehumidification effect is reduced.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provide a defrosting method of a dehumidifier, which can accurately obtain defrosting starting time, quickly defrost and synchronously dehumidify in a dehumidification process so as to improve the dehumidification effect.
In order to achieve the above object, the present invention provides a defrosting method for a dehumidifier, which comprises the following steps:
step S1, providing a dehumidifier, wherein the dehumidifier comprises a first heat exchanger, a second heat exchanger, a compressor, a pressure reducer, a fan, a four-way reversing valve and a temperature detector arranged on the first heat exchanger;
step S2, when the product runs into a dehumidification state, the four-way reversing valve is controlled to enable the refrigerant to flow from the compressor to the second heat exchanger, the pressure reducer and the first heat exchanger in sequence and then return to the compressor, and at the moment, the fan enables gas to be blown to the second heat exchanger from the first heat exchanger side of the dehumidifier; the first heat exchanger is monitored for temperature,
step S3, obtaining the operation time L of the compressor, obtaining the preset operation time LS of the compressor, and judging whether L ≧ LS is established; if yes, go to step S4; if not, returning to the step S2;
step S4, acquiring y temperature conditions of the first heat exchanger before x minutes, calculating Tna as an average temperature value of the y first heat exchangers before x minutes according to a formula of Tna { Tn + T (n-1) + T (n-2) }/y, and recording;
step S5, acquiring the average temperature of the first heat exchanger before v and the average temperature of the first heat exchanger before w in advance, comparing the two average temperatures with Tna acquired in step S4, calculating by combining Tna calculation values through formula ① and formula ②, and recording to obtain the values of delta Tnav and delta Tnaw;
①【ΔTnav＝Tna-Tna(v-1)】
wherein Tna in formula ① is the current average heat exchanger temperature at the time of monitoring;
②【ΔTnaw＝Tna-Tna(w-1)】
wherein Tna in the formula ② is the current average heat exchange temperature during monitoring;
tna (w-1): w is the average heat exchange temperature of the previous time;
step S6, judging whether the DeltaTnav ≧ Xt continuously meets the record or whether the DeltaTnaw ≦ Ax continuously meets the record; xt and Ax are preset constants; if one of the two items is satisfied, the process proceeds to step S7; otherwise, go to step S2;
step S7, starting defrosting operation; recording the ambient temperature Ta; starting to calculate defrosting operation time;
step S8, entering a first defrosting operation state, wherein the compressor is opened, the polarity of the four-way valve is at a defrosting position, the blower is ensured to be in an opening state, and the second heat exchanger is utilized for dehumidification;
step S9 of determining whether Tn ≧ Ta is satisfied, and when the tube temperature Tn of the first heat exchanger is ≧ Ta, the routine proceeds to step S10; when the tube temperature Tn < Ta of the first heat exchanger, the process proceeds to step S8;
step S10, entering a defrosting operation state II, wherein the compressor is opened, the polarity of the four-way valve is in a defrosting position, and meanwhile, the air blower is ensured to be in a closing state; stopping dehumidification;
step S11, judging whether Tn ≧ Ts is established or not, and when the tube body temperature Tn ≧ Ts of the first heat exchanger, entering step S12; when the tube temperature Tn < Ts of the first heat exchanger, the process proceeds to step S10;
step S12 ends the defrosting operation.
Further, in order to ensure the detection accuracy, the value range of x in step S4 is 3min or more and 10min or less.
Further, in order to ensure the detection accuracy, v is taken to be within a range of 3min or more and 5min or less in step S5.
Further, in order to ensure the detection accuracy, in step S5, w is greater than or equal to 3min and less than or equal to 5 min.
According to the defrosting method of the dehumidifier, the temperature condition of the first heat exchanger within a period of time is detected in real time and is compared with the preset temperature, then the average temperature of the first heat exchanger before the point v and the average temperature of the first heat exchanger before the point w are obtained in advance and the average temperature Tna obtained in real time are compared twice, if only one temperature comparison meets the preset requirement, the state needing defrosting is judged, then defrosting is started, and meanwhile, the fan is not stopped at first in the defrosting process, so that the effect that the fan continuously supplies air and then performs dehumidification through the second heat exchanger is achieved, and the effect of achieving dehumidification at the initial stage of defrosting is achieved.
Drawings
Fig. 1 is a schematic flow chart of a defrosting method of a dehumidifier in embodiment 1.
FIG. 2 is a schematic view showing the construction of a dehumidifying apparatus in the defrosting method in embodiment 1;
fig. 3 is an experimental data temperature profile for the first heat exchange in example 1.
In the figure: the heat exchanger comprises a first heat exchanger 1, a second heat exchanger 2, a compressor 3, a decompressor 4, a fan 5, a four-way reversing valve 6 and a temperature detector 7.
Detailed Description
In order to more clearly understand the technical scheme of the invention, the invention is further illustrated by the following embodiments in combination with the accompanying drawings.
Example 1:
as shown in fig. 1, the defrosting method of a dehumidifier provided in this embodiment includes the following steps:
step S1, providing a dehumidifier, wherein the dehumidifier comprises a first heat exchanger, a second heat exchanger, a compressor, a pressure reducer, a fan, a four-way reversing valve and a temperature detector arranged on the first heat exchanger;
as shown in fig. 2, in the dehumidifier of the present embodiment, a first heat exchanger 1, a second heat exchanger 2, a compressor 3, a decompressor 4, a fan 5, a four-way reversing valve 6 and a temperature detector 7 arranged on the first heat exchanger 1 are arranged, the fan 5 is located at the rear end of the second heat exchanger 2, the first heat exchanger 1 is located at the front end of the second heat exchanger 2, two ends of the first heat exchanger 1 are respectively connected with one end of the decompressor 4 and one end of the four-way reversing valve 6, two ends of the second heat exchanger 2 are respectively connected with the other end of the decompressor 4 and the other end of the four-way reversing valve 6, and the other two ends of the four-way reversing valve 6 are connected with two ends of the;
step S2, when the product runs into a dehumidification state, the four-way reversing valve is controlled to enable the refrigerant to flow from the compressor to the second heat exchanger, the pressure reducer and the first heat exchanger in sequence and then return to the compressor, and at the moment, the fan enables gas to be blown to the second heat exchanger from the first heat exchanger side of the dehumidifier; the first heat exchanger is monitored for temperature,
step S3, obtaining the operation time L of the compressor, obtaining the preset operation time LS of the compressor, and judging whether L ≧ LS is established; if yes, go to step S4; if not, returning to the step S2;
step S4, acquiring y temperature conditions of the first heat exchanger before x minutes, calculating Tna as an average temperature value of the y first heat exchangers before x minutes according to a formula of Tna { Tn + T (n-1) + T (n-2) }/y, and recording;
step S5, acquiring the average temperature of the first heat exchanger before v minutes and the average temperature of the first heat exchanger before w minutes in advance; then, comparing the Tna result obtained in step S4 with the two average temperatures, wherein: the average temperature of the first heat exchanger before v and the average temperature of the first heat exchanger before w are the Tna values before v and w, and Tna is calculated by using a formula of Tna ═ Tn + T (n-1) + T (n-2.)... times. + T (n- (y-1)) }/y;
calculating and recording the values of delta Tnav and delta Tnaw by combining the calculated value of Tna with the formula ① and the formula ②;
①【ΔTnav＝Tna-Tna(v-1)】
in the formula ①, Tna represents the current average heat exchanger temperature during monitoring, and actually represents the calculation result of the average value of the current heat exchanger temperature, namely if the current test time is 06: 30, the Tna value of the time period of 06: 30 needs to be obtained;
②【ΔTnaw＝Tna-Tna(w-1)】
wherein Tna in the formula ② is the current average heat exchange temperature during monitoring, and like Tna in the formula 1, if the test time is 06: 30 now, Tna value of the time period of 06: 30 needs to be obtained;
tna (w-1): w is the average heat exchange temperature of the previous time;
step S6, judging whether the DeltaTnav ≧ Xt continuously meets the record or whether the DeltaTnaw ≦ Ax continuously meets the record; xt and Ax are preset constants; if one of the two items is satisfied, the process proceeds to step S7; otherwise, go to step S2;
step S7, starting defrosting operation; recording the ambient temperature Ta; starting to calculate defrosting operation time;
step S8, entering a defrosting operation state I, wherein the compressor is turned on, the polarity of the four-way valve is in a defrosting position (the four-way valve structure comprises a slide block, the flow direction of a refrigerant is changed through the reciprocating of the slide block, the refrigerant is in a defrosting path or a dehumidifying path, and the switching and selection of the four-way valve path belong to the conventional technology, so the specific step is not described), and meanwhile, the blower is ensured to be in a turning-on state, and the second heat exchanger is used for dehumidifying;
step S9 of determining whether Tn ≧ Ta is satisfied, and when the tube temperature Tn of the first heat exchanger is ≧ Ta, the routine proceeds to step S10; when the tube temperature Tn < Ta of the first heat exchanger, the process proceeds to step S8;
step S10, entering a defrosting operation state II, wherein the compressor is opened, the polarity of the four-way valve is in a defrosting position, and meanwhile, the air blower is ensured to be in a closing state; stopping dehumidification;
step S11, judging whether Tn ≧ Ts is established or not, and when the tube body temperature Tn ≧ Ts of the first heat exchanger, entering step S12; when the tube temperature Tn < Ts of the first heat exchanger, the process proceeds to step S10;
step S12 ends the defrosting operation.
Further, in order to ensure the detection accuracy, the value range of x in step S4 is 3min or more and 10min or less.
Further, in order to ensure the detection accuracy, v is taken to be within a range of 3min or more and 5min or less in step S5.
Further, in order to ensure the detection accuracy, in step S5, w is greater than or equal to 3min and less than or equal to 5 min.
The following were analyzed by experimental data: see table below and shown in fig. 3: acquiring data every 10 minutes from each time point, wherein the preset time v of TnaV is two minutes; TnaW is preset for W and five minutes, then data is obtained by calculation according to the formula and is compared with preset data to realize that the temperature condition in a period of time on the first heat exchanger is detected in real time and is compared with the preset temperature, then the average temperature of the first heat exchanger before the point v and the average temperature of the first heat exchanger before the point W are obtained in advance are compared with the average temperature Tna obtained in real time twice, if only one temperature comparison meets the preset requirement, the defrosting state is judged to be the state needing defrosting, then the defrosting is started, and meanwhile, the fan is stopped continuously in the defrosting process to ensure that the fan continuously supplies air and then performs the dehumidifying function through the second heat exchanger, so that the effect of realizing dehumidification at the initial stage of defrosting is obtained, therefore, if one temperature is measured simply, the invention can accurately judge the defrosting amount at the most proper time by preventing the influence of the wave difference by using the average value, thereby accurately judging the defrosting amount of the current heat exchanger.
Claims (4)
1. A defrosting method of a dehumidifier is characterized by comprising the following steps:
step S1, providing a dehumidifier, wherein the dehumidifier comprises a first heat exchanger, a second heat exchanger, a compressor, a pressure reducer, a fan, a four-way reversing valve and a temperature detector arranged on the first heat exchanger;
step S2, when the product runs into a dehumidification state, the four-way reversing valve is controlled to enable the refrigerant to flow from the compressor to the second heat exchanger, the pressure reducer and the first heat exchanger in sequence and then return to the compressor, and at the moment, the fan enables gas to be blown to the second heat exchanger from the first heat exchanger side of the dehumidifier; the first heat exchanger is monitored for temperature,
step S3, obtaining the operation time L of the compressor, obtaining the preset operation time LS of the compressor, and judging whether L ≧ LS is established; if yes, go to step S4; if not, returning to the step S2;
step S4, acquiring y temperature conditions of the first heat exchanger before x minutes in real time, calculating Tna as an average temperature value of the y first heat exchangers before x minutes according to a formula of Tna = { Tn + T (n-1) + T (n-2) }/y, and recording;
step S5, acquiring the average temperature of the first heat exchanger before v and the average temperature of the first heat exchanger before w in advance, comparing the two average temperatures with Tna acquired in step S4, calculating by combining Tna calculation values through formula ① and formula ②, and recording to obtain the values of delta Tnav and delta Tnaw;
①【ΔTnav=Tna-Tna(v-1)】
wherein Tna in formula ① is the current average heat exchanger temperature at the time of monitoring;
②【ΔTnaw=Tna-Tna(w-1)】
wherein Tna in the formula ② is the current average heat exchange temperature during monitoring;
tna (w-1): w is the average heat exchange temperature of the previous time;
step S6, judging whether the DeltaTnav ≧ Xt continuously meets the record or whether the DeltaTnaw ≦ Ax continuously meets the record; xt and Ax are preset constants; if one of the two items is satisfied, the process proceeds to step S7; otherwise, go to step S2;
step S7, starting defrosting operation; recording the ambient temperature Ta; starting to calculate defrosting operation time;
step S8, entering a first defrosting operation state, wherein the compressor is opened, the polarity of the four-way valve is at a defrosting position, the blower is ensured to be in an opening state, and the second heat exchanger is utilized for dehumidification;
step S9 of determining whether Tn ≧ Ta is satisfied, and when the tube temperature Tn of the first heat exchanger is ≧ Ta, the routine proceeds to step S10; when the tube temperature Tn < Ta of the first heat exchanger, the process proceeds to step S8;
step S10, entering a defrosting operation state II, wherein the compressor is opened, the polarity of the four-way valve is in a defrosting position, and meanwhile, the air blower is ensured to be in a closing state; stopping dehumidification;
step S11, judging whether Tn ≧ Ts is established or not, and when the tube body temperature Tn ≧ Ts of the first heat exchanger, entering step S12; when the tube temperature Tn < Ts of the first heat exchanger, the process proceeds to step S10;
step S12 ends the defrosting operation.
2. The defrosting method of a dehumidifier according to claim 1, wherein x is selected from the range of 3min ≤ x ≤ 10min in step S4.
3. The defrosting method of a dehumidifier according to claim 1, wherein v is selected from the range of 3min and 5min in step S5.
4. The defrosting method of a dehumidifier according to claim 1, wherein w is selected from the range of 3min and 5min in step S5.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113847658A (en) * | 2021-10-22 | 2021-12-28 | 海信（广东）空调有限公司 | Dehumidifier and control method thereof |
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| CN106524388A (en) * | 2015-09-11 | 2017-03-22 | 弗德里希新能源科技(杭州)股份有限公司 | Defrosting control method for heat pump unit and air conditioner heat pump unit adopting defrosting control method |
| CN106091179A (en) * | 2016-06-20 | 2016-11-09 | 珠海格力电器股份有限公司 | Method for continuously dehumidifying and defrosting and dehumidifier |
| CN107062446A (en) * | 2017-05-08 | 2017-08-18 | 广东美的制冷设备有限公司 | Air channel structure, dehumidifier and dehumanization method |
| CN107449105A (en) * | 2017-07-05 | 2017-12-08 | 青岛海尔空调器有限总公司 | A kind of control method of air-conditioner defrosting |
| KR20190072724A (en) * | 2017-12-18 | 2019-06-26 | 주식회사 피코그램 | a control system of dehumidifier using fan cooler |
| CN110779164A (en) * | 2019-11-13 | 2020-02-11 | 宁波奥克斯电气股份有限公司 | Air conditioner defrosting control method and device, air conditioner and computer readable storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113847658A (en) * | 2021-10-22 | 2021-12-28 | 海信（广东）空调有限公司 | Dehumidifier and control method thereof |
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