CN113623706A - Anti-freezing protection method, anti-freezing protection system and water system heat pump unit - Google Patents
Anti-freezing protection method, anti-freezing protection system and water system heat pump unit Download PDFInfo
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- CN113623706A CN113623706A CN202010386253.2A CN202010386253A CN113623706A CN 113623706 A CN113623706 A CN 113623706A CN 202010386253 A CN202010386253 A CN 202010386253A CN 113623706 A CN113623706 A CN 113623706A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 282
- 238000007710 freezing Methods 0.000 title claims abstract description 125
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 104
- 238000010257 thawing Methods 0.000 claims abstract description 49
- 238000005057 refrigeration Methods 0.000 claims abstract description 29
- 239000003507 refrigerant Substances 0.000 claims description 33
- 230000002528 anti-freeze Effects 0.000 claims description 23
- 238000001514 detection method Methods 0.000 claims description 16
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 230000008014 freezing Effects 0.000 abstract description 12
- 238000001816 cooling Methods 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 3
- 108010053481 Antifreeze Proteins Proteins 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/12—Tube and panel arrangements for ceiling, wall, or underfloor heating
- F24D3/14—Tube and panel arrangements for ceiling, wall, or underfloor heating incorporated in a ceiling, wall or floor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
-
- 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
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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
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0003—Exclusively-fluid systems
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
-
- 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
- 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
- F25B49/00—Arrangement or mounting of control or safety devices
-
- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/005—Arrangement or mounting of control or safety devices of safety devices
-
- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/04—Preventing the formation of frost or condensate
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Combustion & Propulsion (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to an anti-freezing protection method and an anti-freezing protection system for a water system heat pump unit and the water system heat pump unit. The anti-freezing protection method comprises the following steps: and judging whether the working mode of the heat pump unit is a refrigeration working mode or a heating working mode, executing refrigeration anti-freezing protection if the working mode of the heat pump unit is judged to be the refrigeration working mode, and executing heating anti-freezing protection if the working mode of the heat pump unit is judged to be the heating working mode. The heating anti-freezing protection comprises heating operation anti-freezing protection and defrosting anti-freezing protection. When heating operation is protected against freezing, if the outlet water temperature of the heat exchanger is detected to be not higher than the inlet water temperature, the heat pump unit stops operating and sends an alarm signal. In the defrosting and anti-freezing protection, if the water outlet temperature is lower than the water temperature limit value, the machine is stopped to operate and an alarm signal is sent. Therefore, the anti-freezing protection in the refrigeration and heating working modes can be realized, and the anti-freezing protection in the defrosting working process can be realized.
Description
Technical Field
The invention relates to an anti-freezing protection method and an anti-freezing protection system for a water system heat pump unit and the water system heat pump unit with the anti-freezing protection system.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
A water system heat pump unit is a system that realizes temperature control by supplying cold water or hot water to a user side. Specifically, the water system heat pump unit firstly utilizes a refrigerant to heat or cool water through the plate heat exchanger, and then uses a water pump to send cold water or hot water into an air conditioner or a floor heating system of a user through a water pipe, so that the aim of refrigerating or heating is fulfilled. At present, the water system heat pump units on the market are almost installed outdoors. In this case, during the winter season, when the ambient temperature is below zero, the water in the unit freezes, with the risk of freezing the water-side heat exchanger. Once the heat exchanger is damaged, causing damage and leakage to the water system, the entire system will not work. In such a context, the freeze protection control of the unit and the reliability of the control will be very important.
The general anti-freezing protection mode is divided into anti-freezing protection under two conditions of refrigeration in summer and standby in winter. The refrigeration and freeze protection in summer generally occurs in the refrigeration operation in summer, when the system detects that the water temperature is too low and the risk of freezing exists, the compressor is stopped, and the system does not supply water for cooling any more so as to protect. In winter, the water pump of the water system starts to operate or the heating operation is automatically started to increase the water temperature when the environmental temperature is lower than zero in a standby state, so that the anti-freezing protection is realized.
In most cases, the water system heat pump unit does not need anti-freezing protection during heating operation in winter. Because the water system side is in the high temperature side during heating operation, the water temperature is higher than the freezing point and the environmental temperature during normal heating operation, and the risk of freezing does not exist. Most antifreeze protection controls do not take into account the antifreeze protection during heating operation.
In fact, however, during operation of the water system heat pump unit, if there is a fault in the system, such as a damaged component such as a four-way valve on the refrigerant side or a failed reversal, the water system may still freeze when the amount of water in the system is particularly low and, for example, automatic defrosting. This is also where most anti-freeze protection schemes are ignored.
Disclosure of Invention
In order to overcome the defect that the prior art does not have anti-freezing protection control under the condition that a four-way valve in a system has faults and in the automatic defrosting process, the invention aims to provide a novel and efficient anti-freezing protection method for a water system heat pump unit. The invention also aims to provide an anti-freezing protection system for executing the anti-freezing protection method and a water system heat pump unit with the anti-freezing protection system.
Specifically, the anti-freezing protection method of the water system heat pump unit comprises a working mode judging step. In the working mode judging step, judging whether the working mode of the water system heat pump unit is a refrigeration working mode or a heating working mode, and executing refrigeration anti-freezing protection if the working mode of the water system heat pump unit is judged to be the refrigeration working mode; and if the working mode of the water system heat pump unit is judged to be a heating working mode, heating anti-freezing protection is executed. The heating anti-freezing protection comprises a defrosting judgment step. In the defrosting judging step, judging whether a water system heat pump unit is operating defrosting work, and if not, executing heating operation anti-freezing protection; if so, defrost antifreeze protection is performed. Wherein, the protection of heating operation frostproofing includes: a temperature detection step, wherein in the temperature detection step, the water inlet temperature and the water outlet temperature of water of a heat exchanger for heat exchange between a refrigerant of a water system heat pump unit and the water are detected; a temperature determination step: in the temperature judging step, whether the water outlet temperature is higher than the water inlet temperature is judged, if so, the water system heat pump unit is judged to work normally and the heating working mode is continued, and if not, the water system heat pump unit is judged to be abnormal, the water system heat pump unit stops running and an alarm signal is sent out.
Wherein, the protection of heating operation frostproofing still includes: and a restarting step: after the water system heat pump unit stops running for a preset time, restarting a heating working mode of the water system heat pump unit and executing heating anti-freezing protection; locking the machine: and if the restarting step is continuously and repeatedly executed for more than a preset number of times, locking the water system heat pump unit and not executing the restarting step.
Wherein, the defrosting and antifreezing protection comprises the following steps: detecting the temperature of the outlet water; judging whether the water outlet temperature is lower than a water temperature limit value or not; if not, the defrosting operation is continued, and if so, the water system heat pump unit stops operating and sends an alarm signal.
After the water system heat pump unit stops running for a preset time, the heating working mode of the water system heat pump unit is restarted.
The anti-freezing protection system of the water system heat pump unit comprises: the temperature detection device is used for detecting the water temperature of water circulating in the water system heat pump unit; a main controller coupled in electrical communication with the temperature detection device; the shutdown device is connected with the main controller in an electric communication mode and used for shutting down the water system heat pump unit according to the instruction of the main controller; and the alarm device is connected with the main controller in an electric communication mode and sends out an alarm signal according to the instruction of the main controller. The main controller is configured to include: the refrigeration anti-freezing control module is used for executing refrigeration anti-freezing protection in a refrigeration working mode of the water system heat pump unit; and the heating anti-freezing control module executes heating anti-freezing protection under the heating working mode of the water system heat pump unit. The heating anti-freezing control module comprises a heating operation anti-freezing control module and a defrosting anti-freezing control module. Under the heating working mode of the water system heat pump unit, the heating anti-freezing control module firstly judges whether the water system heat pump unit is operating defrosting work, if not, the heating operation anti-freezing control module executes heating operation anti-freezing protection; and if so, executing defrosting anti-freezing protection by the defrosting anti-freezing control module. The system comprises a heating operation anti-freezing control module, a water system heat pump unit, a water inlet control module, a water outlet control module and a heating operation anti-freezing control module, wherein the heating operation anti-freezing control module is used for judging whether the water outlet temperature of water of a heat exchanger for exchanging heat between refrigerant of the water system heat pump unit and water is higher than the water inlet temperature or not, and if so, the water system heat pump unit is enabled to continue the heating working mode; if not, the shutdown device stops the operation of the water system heat pump unit and the alarm device sends out an alarm signal.
The defrosting and antifreezing control module judges whether the water temperature is lower than a water temperature limit value, and if not, the defrosting operation is continued; if yes, the shutdown device stops the operation of the water system heat pump unit and sends out an alarm signal through the alarm device.
The anti-freezing protection system further comprises a locking device. If the times of continuously and repeatedly executing the stop operation of the water system heat pump unit and sending out the alarm signal exceed the preset times, the water system heat pump unit is locked by the locking device and the locking signal is sent out by the alarm device.
The water system heat pump unit comprises the anti-freezing protection system.
Drawings
The drawings described herein are for illustrative purposes only of exemplary embodiments and are not intended to limit the scope of the present disclosure.
Fig. 1 is a schematic diagram showing a connection line of an exemplary water system heat pump unit according to the present invention.
FIG. 2 is a schematic view of the connection between the main controller of the water system heat pump unit and other devices of the heat pump unit according to the present invention.
FIG. 3 is a control flow diagram of a freeze protection method according to the present invention.
Detailed Description
The invention relates to a water system heat pump unit, and an anti-freezing protection system and an anti-freezing protection method thereof.
Fig. 1 is a schematic view schematically showing a connection line of a water system heat pump unit according to the present invention. As shown in fig. 1, the heat pump unit of the water system according to the present invention is divided into a refrigerant side a, a water side B, and a user side C. On the refrigerant side a, the refrigerant stored in the refrigerant tank 21 is sent to the compressor 22 through a refrigerant pipe, and the compressor 22 compresses the refrigerant and outputs a high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant is sent to the four-way valve 23. The four-way valve 23 determines whether to deliver the refrigerant to the outdoor heat exchanger 24 or to a heat exchanger where the refrigerant and water are heat exchanged, which is the plate heat exchanger 14, by switching different outlets and inlets of the refrigerant. In the cooling operation mode of the water system heat pump unit, the refrigerant is first sent to the outdoor heat exchanger 24 (acting as a condenser) and then sent to the plate heat exchanger 14. In the plate heat exchanger 14, the refrigerant exchanges heat with water circulating in the water side B to cool the water, thereby cooling the user side. In the heating operation mode, the high-temperature refrigerant flowing out of the four-way valve 23 is sent to the plate heat exchanger 14. At the plate heat exchanger 14, the refrigerant heats the water circulating in the water side B, thereby achieving heating on the user side.
On the water side B, a water inlet 17, a water pump 11, a water inlet temperature sensor 12, a pressure release valve 13, a plate heat exchanger 14, a water outlet temperature sensor 15, a water flow switch 16, and a water outlet 18 are provided in this order along the direction of water flow. The water inlet 17 and the water outlet 18 are connected to the terminal equipment on the user side C. The water pump 11 is used to pump water to circulate in the respective water flow lines on the user side. The water inlet temperature sensor 12 is used to detect the inlet water temperature of the water before entering the plate heat exchanger 14. The pressure release valve 13 serves as a protection for preventing the water pressure in the water flow line from being excessively high. Both refrigerant and water flow into the plate heat exchanger 14 and heat exchange is achieved in the plate heat exchanger 14. The water outlet temperature sensor 15 is used to detect the outlet water temperature of the water flowing out of the plate heat exchanger 14 where the heat exchange is completed. The water flow switch 16 is used for detecting the water flow in the water flow pipeline of the water side B, and sending out an alarm signal when the water flow in the water flow pipeline is too low so as to remind a user of supplementing water into the water flow pipeline.
As described above, when the ambient temperature is lower than zero, the water side of the water system heat pump unit is easily frozen, and then the water side heat exchanger and the water flow pipeline are easily frozen, which may cause water leakage of the heat pump unit. Therefore, the common water system heat pump unit is provided with an anti-freezing protection system. Because the water system heat pump unit generally operates in a heating operation mode in winter, because the water side is positioned at a high-temperature side during heating operation, and the water temperature is higher than the freezing point and the environmental temperature during normal heating operation, the risk of freezing does not exist, and the anti-freezing protection control aiming at the heating operation is not set. However, when there is a failure in the heat pump unit, for example, when the four-way valve fails after being powered on, i.e., when the commutation fails or the commutation is wrong, although the control system indicates that the heat pump unit is performing the heating operation mode, the refrigerant actually circulates on the refrigerant side in the cooling operation mode, and at this time, the water circulating on the water side is cooled rather than heated, so there is a risk of freezing the water on the water side at this time. However, because the signal received by the control system is that the water system heat pump unit operates in the heating working mode, the control system does not start the anti-freezing protection. There is therefore a risk of icing in the heat pump unit which cannot be detected in good time.
In order to solve the problem, the novel anti-freezing protection system is arranged in the water system heat pump unit. The novel anti-freezing protection system can perform anti-freezing protection on the heating working mode and the refrigerating working mode of the water system heat pump unit.
Specifically, according to one embodiment of the present invention, an antifreeze protection system includes a main controller that performs antifreeze protection control, and detection means, shutdown means, alarm means, and lock means, which are required for performing the antifreeze protection control, and are coupled in electrical communication with the main controller. As shown in fig. 2, the master controller is coupled in electrical communication with the detection device, the shutdown device, the alarm device, and the latch device. The main controller is constructed to comprise a refrigeration anti-freezing control module for performing anti-freezing protection aiming at a refrigeration working mode of the water system heat pump unit and a heating anti-freezing control module for performing heating anti-freezing protection aiming at a heating working mode of the water system heat pump unit. The main controller also comprises a counter, and the counter is used for counting the number of times of shutdown of the heat pump unit within a certain time. The detection device comprises a temperature detection device arranged in the water system heat pump unit. Specifically, the temperature detection means includes a water inlet temperature sensor 12 for detecting the temperature of the inlet water to the plate heat exchanger 14 and a water outlet temperature sensor 15 for detecting the temperature of the outlet water from the plate heat exchanger 14. Signals of the inlet water temperature and the outlet water temperature detected by the water inlet temperature sensor 12 and the water outlet temperature sensor 15 are transmitted to the main controller. The shutdown device can receive the instruction of the main controller to shut down the water system heat pump unit. The alarm device can send out an alarm signal according to the instruction of the main controller. The locking device can lock the water system heat pump unit according to the instruction of the main controller and send a locking signal by the alarm device. The term "lock" used herein means that the water system heat pump unit cannot be automatically restarted, or manually started by pressing a line controller connected with a main controller, and the water system heat pump unit can be started by only powering off the whole water system heat pump unit, then powering on, and then manually started by pressing the line controller.
Furthermore, the heating antifreeze protection according to the invention also allows for defrosting. It should be noted that when the defrosting operation is performed, the water system heat pump unit performs the cooling operation, and then the temperature of the water side is lowered, so that there is a risk of freezing water. In order to eliminate the risk of water freezing during defrosting operations, the heating antifreeze protection according to the invention also comprises a defrosting antifreeze control module. When the defrosting operation is protected from freezing, the outlet water temperature of the heat exchanger side during the defrosting operation is detected. If the detected outlet water temperature is lower than a certain water temperature limit value, the defrosting and antifreezing control module stops the compressor and sends out an alarm signal. After waiting for a period of time, restarting the heating working mode of the water system heat pump unit.
The operation steps of the antifreeze protection method according to the present invention will be described in detail with reference to fig. 3. After the anti-freezing protection system is started, firstly, a working mode judging step is executed, namely: the main controller firstly judges whether the water system heat pump unit is in a refrigeration working mode or a heating working mode. And if the water system heat pump unit is judged to be in the refrigeration working mode, the refrigeration anti-freezing protection is executed by the refrigeration anti-freezing control module. And if the water system heat pump unit is judged to be in the heating working mode, the heating anti-freezing protection is executed by the heating anti-freezing control module.
Wherein, under the heating mode of the water system heat pump unit, the heating anti-freezing protection is executed by the heating anti-freezing control module. The heating anti-freezing protection comprises heating operation anti-freezing protection and defrosting anti-freezing protection. The heating anti-freezing protection firstly executes a defrosting judgment step. In the defrosting judging step, judging whether the water system heat pump unit is operating defrosting work, and if the water system heat pump unit is judged not to operate defrosting work, executing heating operation anti-freezing protection; and if the water system heat pump unit is judged to be operating defrosting work, defrosting and antifreezing protection is executed.
The heating operation anti-freezing protection method comprises the following steps:
(1) a temperature detection step: here, the temperature detection means detecting the temperature of water flowing in a water flow pipe on the water side of the water system heat pump unit, detecting the temperature of water entering the heat exchanger where the refrigerant and the water exchange heat through the water inlet temperature sensor 12, and detecting the temperature of water leaving the heat exchanger through the water outlet temperature sensor 15.
(2) A temperature determination step: and judging whether the water outlet temperature is higher than the water inlet temperature. And if the outlet water temperature is higher than the inlet water temperature, judging that the water system heat pump unit is performing normal heating operation. Therefore, the water system heat pump unit continues to normally operate, and the alarm device does not send any alarm signal. If the outlet water temperature is not higher than the inlet water temperature, the abnormal operation of the water system heat pump unit is judged, the water system heat pump unit is stopped by the stopping device, namely, the water system heat pump unit is stopped, and an alarm signal is sent by the alarm device.
The heating operation anti-freeze protection can also include:
(3) and a restarting step: after the water system heat pump unit stops running for a preset time, restarting a heating working mode of the water system heat pump unit and executing heating anti-freezing protection;
(4) locking the machine: after the water system heat pump unit stops running, the value of the counter is increased by one, and if the number of times of continuously and repeatedly executing the shutdown step exceeds the preset number, namely the value of the counter exceeds the preset value, the water system heat pump unit is locked through the locking device, and the restarting step is not executed any more. And sends out a lock signal via the alarm device. The predetermined number of times can be, for example, 3 times.
The abnormal operation of the water system heat pump unit may be caused by a failure condition after a four-way valve in the water system heat pump unit is powered on. That is, although the main controller instructs the water system heat pump unit to perform the heating operation mode, the four-way valve does not properly communicate with the inlet and outlet in the heating operation mode, thereby causing a flow error of the refrigerant, so that the refrigerant performs a circulation flow in the cooling operation mode. This results in a situation where the outlet water temperature of the heat exchanger is not higher than the inlet water temperature. Through the heating anti-freezing protection, the main controller can timely find the abnormal reversing condition of the four-way valve and inform a user, the user can timely maintain the water system heat pump unit, the condition that the water side heat exchanger of the water system heat pump unit is frozen due to the fact that the user finds out the abnormal reversing condition is avoided, and loss of the user is reduced to the minimum.
In addition, as described above, the heating antifreeze protection according to the present invention further includes a defrost antifreeze control module. Specifically, the defrosting anti-freezing protection comprises the following steps:
(i) a defrosting temperature detection step: and detecting the outlet water temperature of water flowing out of a heat exchanger in the heat pump unit of the water system.
(ii) A defrosting water temperature judging step: judging whether the water outlet temperature is lower than a water temperature limit value or not, and if the water outlet temperature is not lower than the water temperature limit value, continuing to operate the defrosting operation; if the temperature of the outlet water is lower than the water temperature limit value, the water system heat pump unit stops running and sends out an alarm signal.
And (3) executing the restarting step after stopping the operation of the water system heat pump unit and sending alarm information for a certain time.
FIG. 3 illustrates the overall operation of the heating antifreeze protection system according to the present invention. The integral working process of the heating anti-freezing protection system comprises the following steps:
firstly, judging whether a water system heat pump unit is in a refrigeration working mode or a heating working mode, and if the water system heat pump unit is judged to be in the refrigeration working mode, executing refrigeration anti-freezing protection; and if the water system heat pump unit is judged to be in the heating working mode, heating anti-freezing protection is executed. And after the water system heat pump unit is judged to be in the heating working mode, judging whether the water system heat pump unit is running defrosting work or not, and if the water system heat pump unit is not running defrosting work, executing the heating running anti-freezing protection. And if the water system heat pump unit is operating defrosting work, executing the defrosting and antifreezing protection.
Further, according to another embodiment of the present invention, it is also possible to determine whether or not there is a failure in the four-way valve of the heat pump unit by an abnormality in the temperature of the refrigerant flowing on the refrigerant side. Specifically, temperature detection means, such as a temperature sensor 27 and an ambient temperature sensor 28 of the outdoor heat exchanger, can be provided at the coil of the outdoor heat exchanger of the water system heat pump unit for detecting the temperature of the coil of the outdoor heat exchanger and the ambient temperature outdoors, respectively. Here, the temperature of the coil of the outdoor heat exchanger represents the temperature of the refrigerant flowing therein. Whether the four-way valve works normally is judged by comparing the temperature of the coil pipe of the outdoor heat exchanger with the outdoor environment temperature. Specifically, the step of detecting the temperature of the heating operation for anti-freezing protection (1) may be replaced by the step of detecting the temperature (1') as follows: detecting the temperature of the coil of the outdoor heat exchanger and the outdoor ambient temperature by temperature detecting devices 27 and 28; the temperature determination step (2) may be replaced with the temperature determination step (2'): if the temperature of the outdoor heat exchanger coil is lower than the ambient temperature, the normal operation of the water system heat pump unit is judged; if the temperature of the outdoor heat exchanger coil is not lower than the ambient temperature, the water system heat pump unit is stopped and alarm information is sent out. The other steps are the same as those using the inlet water temperature and the outlet water temperature of the heat exchanger as the determination criteria, and are not described herein again.
The anti-freezing control system not only can carry out anti-freezing protection on the refrigeration mode and the heating mode of the heat pump unit, but also can carry out anti-freezing protection on the defrosting work of the heat pump unit, so that the anti-freezing protection of the heat pump unit is more comprehensive, the fault condition of a four-way valve of the heat pump unit can be timely found, the damage condition of components such as a heat exchanger and the like caused by freezing of a water side when the four-way valve is in fault is avoided, and the loss of a user is reduced. The anti-freezing protection system can judge whether the risk of icing exists in the system only by comparing the water temperature or the temperature of the refrigerant, so that the anti-freezing protection system has high reaction speed.
Exemplary couplings, configurations and/or steps are disclosed for describing the present invention in detail. Detailed descriptions of specific details, such as specific components, steps, and procedures, are provided for a more thorough explanation of the present disclosure. However, it will be apparent to one of ordinary skill in the art that specific details need not be employed, that example couplings, configurations, and/or steps may be embodied in many different forms and that these specific details and example steps should not be construed as limiting the scope of the present disclosure.
Reference numerals
Refrigerant side A
Side of B water
C user side
11 Water pump
12 water inlet temperature sensor
13 pressure relief valve
14 plate heat exchanger
15 water outlet temperature sensor
16 water flow switch
17 water inlet
18 water outlet
21 refrigerant tank
22 compressor
23 four-way valve
24 outdoor heat exchanger
27 temperature sensor of outdoor heat exchanger
28 ambient temperature sensor
Claims (8)
1. An anti-freezing protection method for a water system heat pump unit comprises the following steps:
a working mode judging step: judging whether the working mode of the water system heat pump unit is a refrigeration working mode or a heating working mode, and executing refrigeration anti-freezing protection if the working mode of the water system heat pump unit is judged to be the refrigeration working mode; if the working mode of the water system heat pump unit is judged to be a heating working mode, heating anti-freezing protection is executed,
the heating anti-freezing protection method comprises the following steps:
a defrosting judgment step: judging whether the water system heat pump unit is operating defrosting work or not, and if not, executing heating operation anti-freezing protection; if so, the defrosting anti-freezing protection is executed,
the heating operation anti-freezing protection method comprises the following steps:
a temperature detection step: detecting the water inlet temperature and the water outlet temperature of water of a heat exchanger for exchanging heat between a refrigerant of the water system heat pump unit and the water;
a temperature determination step: and judging whether the water outlet temperature is higher than the water inlet temperature, if so, judging that the water system heat pump unit works normally and continues the heating working mode, and if not, judging that the water system heat pump unit is abnormal, stopping the water system heat pump unit and sending an alarm signal.
2. The protection method of claim 1, wherein the heating operation freeze protection further comprises:
and a restarting step: after the water system heat pump unit stops running for a preset time, restarting the heating working mode of the water system heat pump unit and executing heating anti-freezing protection;
locking the machine: and if the restarting step is continuously and repeatedly executed for more than a preset number of times, locking the water system heat pump unit and not executing the restarting step any more.
3. The antifreeze protection method of claim 1, wherein said defrost antifreeze protection comprises the steps of:
detecting the temperature of the outlet water;
judging whether the water outlet temperature is lower than a water temperature limit value or not; if not, the defrosting operation is continued, and if so, the water system heat pump unit stops operating and sends an alarm signal.
4. The antifreeze protection method according to claim 3, wherein the heating operation mode of the aqueous heat pump system is restarted after stopping the aqueous heat pump system for a predetermined time.
5. An anti-freezing protection system of a water system heat pump unit, wherein, the anti-freezing protection system comprises:
the temperature detection device is used for detecting the water temperature of water circulating in the water system heat pump unit;
a main controller coupled in electrical communication with the temperature detection device;
a shut down device coupled in electrical communication with the main controller, the shut down device shutting down the water system heat pump unit upon command of the main controller;
an alarm device, the main controller being coupled in electrical communication with the alarm device, the alarm device emitting an alarm signal in accordance with instructions from the main controller,
wherein the main controller is configured to include:
the refrigeration anti-freezing control module is used for executing refrigeration anti-freezing protection under the refrigeration working mode of the water system heat pump unit;
the heating anti-freezing control module executes heating anti-freezing protection under the heating working mode of the water system heat pump unit,
the heating anti-freezing control module comprises a heating operation anti-freezing control module and a defrosting anti-freezing control module, and under the heating working mode of the water system heat pump unit, the heating anti-freezing control module firstly judges whether the water system heat pump unit is operating defrosting work, and if not, the heating operation anti-freezing control module executes heating operation anti-freezing protection; if so, the defrosting anti-freezing protection is executed by the defrosting anti-freezing control module,
the heating operation anti-freezing control module is used for judging whether the water outlet temperature of water of a heat exchanger for exchanging heat between refrigerant of the water system heat pump unit and water is higher than the water inlet temperature or not, and if so, the water system heat pump unit is enabled to continue the heating working mode; if not, the shutdown device stops the operation of the water system heat pump unit and the alarm device sends out an alarm signal.
6. The antifreeze protection system of claim 5, wherein, at the defrosting and antifreeze control module, judging whether the outlet water temperature is lower than a water temperature limit value, if not, continuing to operate the defrosting operation; if so, the shutdown device stops the water system heat pump unit and sends out an alarm signal through the alarm device.
7. The antifreeze protection system of claim 5 or 6, wherein the antifreeze protection system further comprises a latch mechanism,
if the times of continuously and repeatedly executing the stop operation of the water system heat pump unit and sending out the alarm signal exceed the preset times, the water system heat pump unit is locked by the locking device and the alarm device sends out the locking signal.
8. A water system heat pump unit having an antifreeze protection system according to any one of claims 5 to 7.
Priority Applications (2)
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| CN202010386253.2A CN113623706B (en) | 2020-05-09 | 2020-05-09 | Anti-freezing protection method, anti-freezing protection system and water system heat pump unit |
| PCT/CN2020/122389 WO2021227365A1 (en) | 2020-05-09 | 2020-10-21 | Anti-freezing protection method, anti-freezing protection system, and heat pump unit of water system |
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| CN202010386253.2A CN113623706B (en) | 2020-05-09 | 2020-05-09 | Anti-freezing protection method, anti-freezing protection system and water system heat pump unit |
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Cited By (2)
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| CN114046591A (en) * | 2021-12-01 | 2022-02-15 | 南京天加环境科技有限公司 | Control method for household water machine |
| CN114294784A (en) * | 2021-12-28 | 2022-04-08 | 中山市爱美泰电器有限公司 | Defrosting control method for heat pump unit and heat pump unit |
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| CN114279108B (en) * | 2021-12-29 | 2023-09-12 | 中山市爱美泰电器有限公司 | Control method for preventing failure caused by water flow loss in heat pump refrigeration process |
| CN114739063B (en) * | 2022-04-26 | 2024-02-23 | 青岛海尔空调电子有限公司 | Heat pump unit and control method thereof |
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Also Published As
| Publication number | Publication date |
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| WO2021227365A1 (en) | 2021-11-18 |
| CN113623706B (en) | 2023-05-16 |
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