CN112923515B - Defrosting method of heat pump unit - Google Patents
Defrosting method of heat pump unit Download PDFInfo
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- CN112923515B CN112923515B CN202110297180.4A CN202110297180A CN112923515B CN 112923515 B CN112923515 B CN 112923515B CN 202110297180 A CN202110297180 A CN 202110297180A CN 112923515 B CN112923515 B CN 112923515B
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- pump unit
- heat pump
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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
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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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
- 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
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F24F11/88—Electrical aspects, e.g. circuits
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Thermal Sciences (AREA)
- Human Computer Interaction (AREA)
- Air Conditioning Control Device (AREA)
Abstract
A defrosting method of a heat pump unit judges whether to enter a defrosting mode or not according to the difference value between the outdoor heat exchanger temperature T3 and the lowest value T30 of the recorded outdoor heat exchanger temperature T3 between the first test time and the second test time at the first running time, so that the unit can defrost when the attenuation of T3 is detected; whether the defrosting mode is started or not is judged according to the difference value between the environment temperature T4 and the temperature T3 of the outdoor heat exchanger at the second running time, so that the heat pump unit can be started in the defrosting mode when the heat pump unit is not frosted normally; whether the defrosting mode is started or not is judged according to the environmental temperature T5 of the indoor heat exchanger, so that the phenomenon that the temperature of the indoor heat exchanger is too low when the indoor heat exchanger is started in the defrosting mode, and the interior of a heat pump unit is frozen is avoided; the heat pump unit is enabled to enter defrosting on the premise that the judgment results of three conditions detected in each step are yes, so that the heat pump unit cannot frequently defrost.
Description
Technical Field
The invention relates to the technical field of air-conditioning heat pump units, in particular to a defrosting method of a heat pump unit.
Background
Generally, when an air conditioner operates in a heating mode, an indoor heat exchanger and an outdoor heat exchanger respectively perform condensation heat release and evaporation heat absorption. In winter, the outdoor environment temperature is low, and the evaporation and heat absorption of the outdoor heat exchanger can cause the water vapor in the air to be condensed into frost and attached to the surface of the outdoor heat exchanger or the surface of an outdoor unit, so that the evaporation and heat absorption capacity of the outdoor heat exchanger is reduced, the heating capacity of the air conditioner is reduced, and defrosting is needed in time. At present, a heat pump unit can judge whether defrosting is needed or not according to the ambient temperature and the temperature of an evaporator tube, but the judgment is not accurate, whether frosting attenuation occurs in the heat pump unit or not can not be judged accurately, and a temperature sensor can misjudge the ambient temperature and the temperature of the evaporator tube, so that frequent defrosting of the heat pump unit is caused, the water temperature of a heat pump is reduced, and high water temperature cannot be provided continuously; in addition, when the unit encounters high humidity or freezing rain weather, the unit cannot normally enter defrosting.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a defrosting method of a heat pump unit.
In order to achieve the above object, the present invention provides a defrosting method for a heat pump unit, wherein the heat pump unit comprises an outdoor unit and an indoor unit, the indoor unit comprises an indoor heat exchanger, the outdoor unit comprises an outdoor heat exchanger, and the defrosting method is characterized in that: the outdoor unit also comprises an outdoor temperature sensor for detecting the temperature T3 of the outdoor heat exchanger and an ambient temperature sensor for detecting the ambient temperature T4; the indoor unit also comprises an indoor temperature sensor for detecting the temperature T5 of the indoor heat exchanger; the defrosting method comprises the following steps:
step S1: starting a heat pump unit to operate a heating mode;
step S2: in step S1, if the heat pump unit is not powered on for the first time, the heat pump unit detects and records the lowest value T30 of the temperature T3 of the outdoor heat exchanger between the first test time and the second test time, and then operates step S3; if the heat pump unit is powered on and started for the first time, the heat pump unit detects and judges whether T3 is lower than a first preset temperature, whether T4-T3 is higher than a second preset temperature and whether T5 is higher than a third preset temperature, if yes, the heat pump unit enters a defrosting mode, otherwise, the heat pump unit continues to normally operate;
step S3: after the heat pump unit is started to operate for a first operation time, the heat pump unit detects and judges whether T3 is smaller than a fourth preset temperature, whether T30-T3 is larger than a fifth preset temperature and whether T5 is larger than a third preset temperature, if yes, the heat pump unit enters a defrosting mode, otherwise, the heat pump unit operates according to the step S4;
step S4: after the heat pump unit is started up and operates for the second operation time, the heat pump unit detects and judges whether T3 is smaller than a sixth preset temperature, whether T4-T3 is larger than the second preset temperature and whether T5 is larger than the third preset temperature, if yes, the heat pump unit enters a defrosting mode, otherwise, the heat pump unit operates according to the step S5;
step S5: and after the heat pump unit is started up and operates for the third operation time, if the heat pump unit detects and judges that the T3 is lower than the seventh preset temperature, the heat pump unit enters a defrosting mode, otherwise, the heat pump unit continues to operate normally.
Further, the first predetermined temperature is-12 ℃, the second predetermined temperature is 4 ℃, the third predetermined temperature is 4 ℃, the fourth predetermined temperature is-7 ℃, the fifth predetermined temperature is 2.5 ℃, the sixth predetermined temperature is-14 ℃, and the seventh predetermined temperature is 0 ℃.
Further, the first operation time is 40 minutes, the second operation time is 70 minutes, the third operation time is 150 minutes,
further, the first test time is 7 minutes, and the second test time is 12 minutes.
Further, the outdoor unit further includes a compressor.
Further, the outdoor unit also comprises a four-way valve, wherein the four-way valve comprises an interface A, an interface B, an interface C and an interface D.
Further, the output end of the compressor is connected with an interface A of the four-way valve, one end of the outdoor heat exchanger is connected with an interface B of the four-way valve, the input end of the compressor is connected with an interface C of the four-way valve, one end of the indoor heat exchanger is connected with an interface D of the four-way valve, and the other end of the outdoor heat exchanger is connected with the other end of the indoor heat exchanger.
Further, the outdoor temperature sensor is arranged on a pipeline at one end of the outdoor heat exchanger.
Further, the ambient temperature sensor is disposed on a casing of the outdoor heat exchanger.
Further, the indoor temperature sensor is arranged on a pipeline at one end of the indoor heat exchanger.
The invention has the beneficial effects that: judging whether to enter a defrosting mode according to the difference value between the outdoor heat exchanger temperature T3 and the recorded outdoor heat exchanger temperature T3 at the first running time and the lowest value T30 between the first test time and the second test time, so that the unit can defrost when the attenuation of the T3 is detected; whether the defrosting mode is started or not is judged according to the difference value between the environment temperature T4 and the temperature T3 of the outdoor heat exchanger at the second running time, so that the heat pump unit can be started in the defrosting mode when the heat pump unit is not frosted normally; whether the defrosting mode is started or not is judged according to the environmental temperature T5 of the indoor heat exchanger, so that the phenomenon that the temperature of the indoor heat exchanger is too low when the indoor heat exchanger is started in the defrosting mode, and the interior of a heat pump unit is frozen is avoided; the heat pump unit is enabled to enter defrosting on the premise that the judgment results of three conditions detected in each step are yes, so that the heat pump unit cannot frequently defrost.
Drawings
FIG. 1 is a schematic diagram of a heat pump unit.
Fig. 2 is a schematic diagram of the steps of the defrosting method.
The system comprises an outdoor temperature sensor 1, an environment temperature sensor 2, an indoor temperature sensor 3, a compressor 4, a four-way valve 5, an outdoor heat exchanger 6, an outdoor unit 7, an indoor heat exchanger 8 and an indoor unit 9.
Detailed Description
To facilitate an understanding of the invention, the invention is described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 1, in the present embodiment, a defrosting method of a heat pump unit includes an outdoor unit 7 and an indoor unit 9, where the outdoor unit 7 includes a compressor 4, a four-way valve 5, an outdoor unit 7 heat exchanger, an outdoor temperature sensor 1 for detecting an outdoor heat exchanger temperature T3, and an ambient temperature sensor 2 for detecting an ambient temperature T4, and the indoor unit 9 includes an indoor heat exchanger 8 and an indoor temperature sensor 3 for detecting an indoor heat exchanger temperature T5. The four-way valve 5 comprises an interface A, an interface B, an interface C and an interface D, wherein the output end of the compressor 4 is connected with the interface A of the four-way valve 5, one end of the outdoor heat exchanger 6 is connected with the interface B of the four-way valve 5, the input end of the compressor 4 is connected with the interface C of the four-way valve 5, and one end of the indoor heat exchanger 8 is connected with the interface D of the four-way valve 5. The other end of the outdoor heat exchanger 6 is connected with the other end of the indoor heat exchanger 8. The outdoor temperature sensor 1 is arranged on a pipeline at one end of the outdoor heat exchanger 6, the environment temperature sensor 2 is arranged on a shell of the outdoor heat exchanger 6, and the indoor temperature sensor 3 is arranged on a pipeline at one end of the indoor heat exchanger 8.
Referring to fig. 2, in the present embodiment, the defrosting method includes the following steps:
step S1: starting a heat pump unit to operate a heating mode;
step S2: in step S1, if the heat pump unit is not powered on for the first time, the heat pump unit detects and records the lowest value T30 of the temperature T3 of the outdoor heat exchanger between the time of running to the first test time and the time of running to the second test time, and then runs step S3, wherein the first test time is 7 minutes, and the second test time is 12 minutes.
If the heat pump unit is powered on and started for the first time, the heat pump unit detects and judges whether the temperature T3 of the outdoor heat exchanger is lower than a first preset temperature, whether the difference value between the environmental temperature T4 and the temperature T3 of the outdoor heat exchanger is higher than a second preset temperature, and whether the temperature T5 is higher than a third preset temperature, if the judgment results are yes, the heat pump unit enters a defrosting mode, otherwise, if the judgment result of one condition is no, the heat pump unit continues to normally operate, wherein the first preset temperature is-12 ℃, the second preset temperature is 4 ℃, and the third preset temperature is 4 ℃; namely, at the moment, if T3 is less than-12 ℃, T4-T3 is more than 4 ℃ and T5 is more than 4 ℃, the heat pump unit enters a defrosting mode, so that the defrosting can be rapidly carried out when the heat pump unit is powered on for the first time and the current fins are frosted.
Step S3: after the heat pump unit is started to operate for a first operation time, if the heat pump unit detects and judges whether T3 is smaller than a fourth preset temperature, whether T30-T3 is larger than a fifth preset temperature, and whether T5 is larger than a third preset temperature, if the judgment results are yes, the heat pump unit enters a defrosting mode, otherwise, if the judgment result of one of the conditions is no, the size of the temperature T3 of the outdoor heat exchanger is not accurately judged due to severe weather, or, the outdoor unit 7 is not frosted at the time, and the heat pump unit operates according to step S4. In this example, the first run time was 40 minutes, the fourth predetermined temperature was-7 ℃, and the fifth predetermined temperature was 2.5 ℃; namely, after the heat pump unit is started to operate for 40 minutes, if T3 is less than-7 ℃, T30-T3 is more than 2.5 ℃, T5 is more than 4 ℃, the heat pump unit enters a defrosting mode. Through detecting T3 and recording the lowest value T30 of the outdoor heat exchanger temperature T3 between the first test time and the second test time, the heat pump unit can accurately judge the condition that the performance of the heat pump unit is attenuated due to frosting, and therefore the heat pump unit can defrost in time. By detecting the temperature T5 of the indoor heat exchanger, the phenomenon that the temperature T5 of the indoor heat exchanger is too low when the heat pump unit operates in a defrosting mode, so that the indoor unit 9 is frozen is avoided.
Step S4: after the heat pump unit is started up and operates for the second operation time, if the heat pump unit detects and judges whether T3 is smaller than a sixth preset temperature, whether T4-T3 is larger than the second preset temperature, and whether T5 is larger than the third preset temperature, if the judgment results are yes, the heat pump unit enters a defrosting mode, otherwise, if the judgment result of one condition is no, the heat pump unit operates according to the step S5.
In this example, the second run time was 70 minutes and the sixth predetermined temperature was-14 ℃; namely, after the heat pump unit is started to operate for 70 minutes, if T3 is less than-14 ℃, T4-T3 is more than 4 ℃, and T5 is more than 4 ℃, the heat pump unit enters a defrosting mode. Through detecting the temperature difference between T4 and T3, the heat pump unit can enter a defrosting mode when abnormal frosting occurs, wherein the abnormal frosting condition comprises the conditions that the bottom of the outdoor unit 7 is frozen, the heat pump unit frequently defrosts, the outdoor unit 7 frosts due to the fault of the environment temperature sensor 2, the outdoor unit 7 frosts due to the fact that the outdoor unit 7 meets the conditions of large humidity or frost in freezing rain weather, and the like, and the heat pump unit can also enter defrosting in time in a severe frosting environment.
Step S5: after the heat pump unit is started up and runs for a third running time, if the heat pump unit detects and judges that T3 is lower than a seventh preset temperature, the heat pump unit enters a defrosting mode, otherwise, the heat pump unit continues to run normally, wherein the third running time is 150 minutes, and the seventh preset temperature is 0 ℃; namely, after the heat pump unit is started to operate for 150 minutes, if T3 is less than 0 ℃, the heat pump unit enters a defrosting mode, so that the heat pump unit is prevented from defrosting for a long time under the condition that the temperature T3 and the ambient temperature T4 of the outdoor heat exchanger are misjudged.
The above-described embodiments are merely preferred embodiments of the present invention, which is not intended to limit the present invention in any way. Those skilled in the art can make many changes, modifications, and equivalents to the embodiments of the invention without departing from the scope of the invention as set forth in the claims below. Therefore, equivalent changes made according to the spirit of the present invention should be covered within the protection scope of the present invention without departing from the contents of the technical scheme of the present invention.
Claims (9)
1. The defrosting method of the heat pump unit comprises an outdoor unit (7) and an indoor unit (9), wherein the indoor unit (9) comprises an indoor heat exchanger (8), the outdoor unit (7) comprises an outdoor heat exchanger (6), and the defrosting method is characterized in that: the outdoor unit (7) also comprises an outdoor temperature sensor (1) for detecting the temperature T3 of the outdoor heat exchanger and an ambient temperature sensor (2) for detecting the ambient temperature T4; the indoor unit (9) also comprises an indoor temperature sensor (3) for detecting the temperature T5 of the indoor heat exchanger; the defrosting method comprises the following steps:
step S1: starting a heat pump unit to operate a heating mode;
step S2: in step S1, if the heat pump unit is not powered on for the first time, the heat pump unit detects and records the lowest value T30 of the temperature T3 of the outdoor heat exchanger between the first test time and the second test time, and then operates step S3; if the heat pump unit is powered on and started for the first time, the heat pump unit detects and judges whether T3 is smaller than a first preset temperature, whether T4-T3 is larger than a second preset temperature and whether the temperature T5 of the indoor heat exchanger is larger than a third preset temperature, if yes, the heat pump unit enters a defrosting mode, otherwise, the heat pump unit continues to normally operate;
step S3: after the heat pump unit is started to operate for a first operation time, the heat pump unit detects and judges whether T3 is smaller than a fourth preset temperature, whether T30-T3 is larger than a fifth preset temperature and whether T5 is larger than a third preset temperature, if yes, the heat pump unit enters a defrosting mode, otherwise, the heat pump unit operates according to the step S4;
step S4: after the heat pump unit is started up and operates for the second operation time, the heat pump unit detects and judges whether T3 is smaller than a sixth preset temperature, whether T4-T3 is larger than the second preset temperature and whether T5 is larger than the third preset temperature, if yes, the heat pump unit enters a defrosting mode, otherwise, the heat pump unit operates according to the step S5;
step S5: and after the heat pump unit is started up and operates for the third operation time, if the heat pump unit detects and judges that the T3 is lower than the seventh preset temperature, the heat pump unit enters a defrosting mode, otherwise, the heat pump unit continues to operate normally.
2. The defrosting method of a heat pump unit according to claim 1, characterized in that: the first predetermined temperature is-12 ℃, the second predetermined temperature is 4 ℃, the third predetermined temperature is 4 ℃, the fourth predetermined temperature is-7 ℃, the fifth predetermined temperature is 2.5 ℃, the sixth predetermined temperature is-14 ℃ and the seventh predetermined temperature is 0 ℃.
3. The defrosting method of a heat pump unit according to claim 1, characterized in that: the first run time was 40 minutes, the second run time was 70 minutes, and the third run time was 150 minutes.
4. The defrosting method of a heat pump unit according to claim 1, characterized in that: the first test time was 7 minutes and the second test time was 12 minutes.
5. The defrosting method of a heat pump unit according to claim 1, characterized in that: the outdoor unit (7) further comprises a compressor (4) and a four-way valve (5), wherein the four-way valve (5) comprises an interface A, an interface B, an interface C and an interface D.
6. A defrosting method of a heat pump unit according to claim 5, characterized in that: the output end of the compressor (4) is connected with an interface A of the four-way valve (5), one end of the outdoor heat exchanger (6) is connected with an interface B of the four-way valve (5), the input end of the compressor (4) is connected with an interface C of the four-way valve (5), one end of the indoor heat exchanger (8) is connected with an interface D of the four-way valve (5), and the other end of the outdoor heat exchanger (6) is connected with the other end of the indoor heat exchanger (8).
7. The defrosting method of a heat pump unit according to claim 1, characterized in that: the outdoor temperature sensor (1) is arranged on a pipeline at one end of the outdoor heat exchanger (6).
8. The defrosting method of a heat pump unit according to claim 1, characterized in that: the environment temperature sensor (2) is arranged on a shell of the outdoor heat exchanger (6).
9. The defrosting method of a heat pump unit according to claim 1, characterized in that: the indoor temperature sensor (3) is arranged on a pipeline at one end of the indoor heat exchanger (8).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110297180.4A CN112923515B (en) | 2021-03-19 | 2021-03-19 | Defrosting method of heat pump unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110297180.4A CN112923515B (en) | 2021-03-19 | 2021-03-19 | Defrosting method of heat pump unit |
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| CN112923515A CN112923515A (en) | 2021-06-08 |
| CN112923515B true CN112923515B (en) | 2022-03-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105987484B (en) * | 2015-02-28 | 2019-01-11 | 青岛海尔空调器有限总公司 | Defrosting control method and system when the frequent high temperature-proof of air-conditioning heating is protected |
| CN105928265B (en) * | 2016-05-31 | 2019-02-05 | 广东美的制冷设备有限公司 | Air-conditioning system and its defrosting control method |
| CN107246701A (en) * | 2016-09-13 | 2017-10-13 | 奥克斯空调股份有限公司 | A kind of air conditioner chamber's external heat exchanger defrosting or snow removing control method |
| EP3531045A4 (en) * | 2016-10-20 | 2019-08-28 | GD Midea Heating & Ventilating Equipment Co., Ltd. | Method and device for defrosting air conditioner |
| CN106594976B (en) * | 2016-11-11 | 2018-12-18 | 青岛海尔空调器有限总公司 | Machine cleaning method inside and outside air-conditioning |
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