CN115773613A - Condensation prevention control method and device for heat pump system and heat pump system - Google Patents
Condensation prevention control method and device for heat pump system and heat pump system Download PDFInfo
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- CN115773613A CN115773613A CN202211413367.7A CN202211413367A CN115773613A CN 115773613 A CN115773613 A CN 115773613A CN 202211413367 A CN202211413367 A CN 202211413367A CN 115773613 A CN115773613 A CN 115773613A
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- 238000009833 condensation Methods 0.000 title claims abstract description 116
- 230000005494 condensation Effects 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 81
- 230000002265 prevention Effects 0.000 title claims abstract description 41
- 239000003507 refrigerant Substances 0.000 claims abstract description 215
- 238000001816 cooling Methods 0.000 claims abstract description 98
- 239000007788 liquid Substances 0.000 claims abstract description 95
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 84
- 238000005485 electric heating Methods 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 18
- 238000004590 computer program Methods 0.000 claims description 7
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 7
- 239000002826 coolant Substances 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention provides a heat pump system anti-condensation control method and device and a heat pump system, and relates to the technical field of heat pump system control. The control method comprises the following steps: acquiring the outdoor dew point temperature and the temperature of a refrigerant liquid pipe; judging whether the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature or not; if so, performing anti-condensation control, opening the second electronic expansion valve, adjusting the valve step of the first electronic expansion valve to be smaller than that of the second electronic expansion valve, and starting the electric heating of the water heater. According to the control method, when the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature, a condensation prevention measure is taken, most of the refrigerant flows through the second electronic expansion valve, only a small part of the refrigerant flows through the first electronic expansion valve and the refrigerant cooling pipe, water can be heated by electric heating after the water heater is started, the temperature of the refrigerant can be increased by heat exchange between water and the refrigerant, and the problem of condensation caused by low temperature of the refrigerant cooling pipe is effectively avoided in two aspects of slowing down temperature reduction and raising temperature.
Description
Technical Field
The invention relates to the technical field of heat pump system control, in particular to a condensation prevention control method and device for a heat pump system and the heat pump system.
Background
In the prior art, in a heat pump system, a refrigerant cooling function is used for cooling a control plate, and the effect is good, so that the application is wide. However, there are also many after-sales feedbacks, which cause condensed water to permeate into the control panel due to condensation of the refrigerant cooling pipe, thereby causing the problem of burnout of the control panel.
Disclosure of Invention
The invention aims to provide a condensation prevention control method for a heat pump system, which aims to solve the technical problem that a control plate is burnt out due to condensation of a refrigerant cooling pipe of the heat pump system in the prior art.
The invention provides an anti-condensation control method of a heat pump system, which is applied to the heat pump system, wherein a refrigerant side of the heat pump system comprises a refrigerant cooling pipe, a first electronic expansion valve and a second electronic expansion valve, the refrigerant cooling pipe is used for cooling a control plate, the first electronic expansion valve is connected with the refrigerant cooling pipe in series, and the second electronic expansion valve is connected with the first electronic expansion valve and the refrigerant cooling pipe in parallel; the water side of the heat pump system includes a water heater having electrical heating; the control method comprises the following steps: acquiring the outdoor dew point temperature and the temperature of a refrigerant liquid pipe; judging whether the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature or not; and if the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature, performing condensation prevention control, opening the second electronic expansion valve, adjusting the valve step of the first electronic expansion valve to be smaller than that of the second electronic expansion valve, and starting the electric heating of the water heater.
The condensation prevention control method for the heat pump system provided by the invention has the following beneficial effects that:
the heat pump system condensation prevention control method provided by the invention has the advantages that the temperature of the refrigerant liquid pipe is compared with the outdoor dew point temperature, when the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature, condensation prevention measures are taken, the second electronic expansion valve connected with the refrigerant cooling pipe in parallel is opened, and the valve step of the first electronic expansion valve connected with the refrigerant cooling pipe in series is controlled to be smaller than that of the second electronic expansion valve, so that most of the refrigerant flows through the second electronic expansion valve, only a small part of the refrigerant flows through the first electronic expansion valve and the refrigerant cooling pipe, all the refrigerants are effectively prevented from flowing through the first electronic expansion valve and the refrigerant cooling pipe, the temperature of the refrigerant cooling pipe can be controlled not to be too low, and the heat of heating devices of a control panel can be utilized to heat the refrigerant cooling pipe; meanwhile, when the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature, the electric heating of the water heater is started, the electric heating supplies water for heating, the circulating water temperature can be increased, and after the water temperature rises, the water exchanges heat with the refrigerant, the temperature of the refrigerant can be increased, and then the temperature of the refrigerant cooling pipe is increased.
Preferably, the control method further includes: when the electric heating of the water heater is started, the variable frequency water pump is started.
Under this technical scheme, the frequency conversion water pump can accelerate hydrologic cycle rate to can transmit the heat of water to the refrigerant as early as possible, and then make the refrigerant cooling tube heat up fast.
Further, the control method further includes: and if the temperature of the refrigerant liquid pipe is higher than the outdoor dew point temperature, opening the first electronic expansion valve and closing the second electronic expansion valve.
Under this technical scheme, when refrigerant liquid pipe temperature was greater than outdoor dew point temperature, it showed that there is not the condensation risk in refrigerant liquid pipe, so, can normally control, make the refrigerant all flow through first electronic expansion valve and refrigerant cooling tube to make full use of refrigerant cooling tube is to the cooling effect of control panel.
Further, the control method further includes: in the process of carrying out anti-condensation control, judging whether the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature; and if the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature, gradually reducing the opening degree of the first electronic expansion valve until the temperature of the refrigerant liquid pipe is greater than the outdoor dew point temperature.
Under this technical scheme, at the in-process of preventing condensation control, if refrigerant liquid pipe temperature is less than or equal to outdoor dew point temperature, explain that the condensation risk has appeared in the refrigerant liquid pipe, and reduce the aperture of first electronic expansion valve, can further reduce the flow of the refrigerant of flowing through first electronic expansion valve and refrigerant cooling tube, thereby can alleviate the temperature reduction phenomenon of refrigerant cooling tube, and under the effect of the heat of control panel heating element and water system electrical heating etc., make the temperature of refrigerant cooling tube rise to above outdoor dew point temperature as early as possible, and prevent the production of condensation in time.
Further, the step of gradually decreasing the opening degree of the first electronic expansion valve includes: and closing the first electronic expansion valve at a preset speed.
Further, the control method further includes: and in the process of carrying out condensation prevention control, if the temperature of the refrigerant liquid pipe is greater than the outdoor dew point temperature, maintaining the current situation.
Under this technical scheme, if the in-process of preventing the condensation control, refrigerant liquid pipe temperature is greater than outdoor dew point temperature, shows that there is not the condensation risk in refrigerant liquid pipe, maintains the present situation, namely maintains the aperture of first electronic expansion valve and second electronic expansion valve unchangeably, maintains the electric heating state of water heater unchangeably.
Further, the control method further includes: in the process of maintaining the current situation, judging whether the temperature of the refrigerant liquid pipe is greater than or equal to the sum of the outdoor dew point temperature and a preset temperature, wherein the preset temperature is greater than zero; and if the temperature of the refrigerant liquid pipe is more than or equal to the sum of the outdoor dew point temperature and the preset temperature, the anti-condensation control is quitted.
Under this technical scheme, at the in-process of preventing condensation control, if refrigerant liquid pipe temperature exceeds outdoor dew point temperature by a definite temperature, it is higher than really to explain refrigerant liquid pipe temperature, and the possibility that it falls to outdoor dew point temperature in the short time is less, and the refrigerant liquid pipe takes place the risk of condensation also for a short time, so, at this moment, take and withdraw from the strategy of preventing condensation control, cold volume that can make full use of refrigerant liquid pipe carries out cooling to the control panel, improves the cooling effect to the control panel.
Further, the control method further includes: and in the process of maintaining the current situation, if the temperature of the refrigerant liquid pipe is less than the sum of the outdoor dew point temperature and the preset temperature difference, the current situation is continuously maintained.
Under this technical scheme, at the in-process of preventing condensation control, if refrigerant liquid pipe temperature is higher than outdoor dew point temperature, but the difference in temperature does not reach preset temperature, explains that refrigerant liquid pipe temperature's temperature is still not high enough, and it is bigger to drop to outdoor dew point temperature's possibility in the short time after preventing condensation control to withdraw from, and refrigerant liquid pipe takes place the risk height of condensation, so, continues to maintain the current situation unchangeably.
The second objective of the present invention is to provide a condensation prevention control device for a heat pump system, so as to solve the technical problem that a control panel is burnt out due to condensation of a cooling medium cooling pipe of the heat pump system in the prior art.
The heat pump system condensation prevention control device provided by the invention can implement the control method, and comprises an acquisition module, a judgment module and an adjustment module, wherein the acquisition module is used for acquiring the outdoor dew point temperature and the refrigerant liquid pipe temperature; the judging module is used for judging whether the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature; the adjusting module is used for performing condensation prevention control, opening the second electronic expansion valve, adjusting the valve step of the first electronic expansion valve to be smaller than that of the second electronic expansion valve and starting the electric heating of the water heater if the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature; the heat pump system comprises a heat pump system, a first electronic expansion valve, a second electronic expansion valve, a refrigerant cooling pipe, a first electronic expansion valve, a second electronic expansion valve and a control panel, wherein the refrigerant cooling pipe, the first electronic expansion valve and the second electronic expansion valve are all positioned on the refrigerant side of the heat pump system, the refrigerant cooling pipe is used for cooling the control panel, the first electronic expansion valve is connected with the refrigerant cooling pipe in series, and the second electronic expansion valve is connected with the first electronic expansion valve and the refrigerant cooling pipe in parallel; the water heater is located on the water side of the heat pump system.
The control device provided by the present invention can implement the above-mentioned control method, so that all the advantageous effects of the above-mentioned control method can be obtained, and therefore, the details thereof are not described herein again.
The third objective of the present invention is to provide a heat pump system, so as to solve the technical problem that the control board is burned out due to condensation of the cooling pipe of the cooling medium of the heat pump system in the prior art.
The heat pump system provided by the invention has the advantages that the refrigerant side of the heat pump system comprises a refrigerant cooling pipe, a first electronic expansion valve and a second electronic expansion valve, the water side of the heat pump system comprises a water heater, the water heater is electrically heated, the heat pump system also comprises the condensation prevention control device of the heat pump system, the refrigerant cooling pipe is used for cooling a control plate, the first electronic expansion valve is connected with the refrigerant cooling pipe in series, the second electronic expansion valve is connected with the first electronic expansion valve and the refrigerant cooling pipe in parallel, and the condensation prevention control device of the heat pump system is used for controlling the first electronic expansion valve, the second electronic expansion valve and the water heater.
The heat pump system provided by the present invention can implement the above control method, so that all the beneficial effects of the above control method can be obtained, and therefore, the detailed description thereof is omitted.
A fourth object of the present invention is to provide a computer readable storage medium, so as to solve the technical problem in the prior art that a control board is burned down due to condensation of a cooling pipe of a cooling medium of a heat pump system.
The invention provides a computer readable storage medium, which stores a computer program, and when the computer program is read and operated by a processor, the anti-condensation control method of the heat pump system is realized.
The computer-readable storage medium provided by the present invention can implement the control method when the stored computer program runs, so that all the beneficial effects of the control method can be obtained, and the detailed description thereof is omitted here.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a simplified diagram of a refrigerant flow path of a heat pump system in the prior art;
fig. 2 is a simplified schematic diagram of a refrigerant flow path of the heat pump system according to the embodiment of the present invention;
FIG. 3 is a block diagram of a method for controlling anti-condensation of a heat pump system according to an embodiment of the present invention;
fig. 4 is a flowchart of a condensation prevention control method for a heat pump system according to an embodiment of the present invention;
fig. 5 is a block diagram of a condensation prevention control device of a heat pump system according to an embodiment of the present invention.
Description of reference numerals:
110-a control panel; 120-a compressor; 130-plate heat exchanger; 140-liquid tube temperature sensor; 150-a one-way valve assembly; 160-refrigerant cooling pipes; 170-a first electronic expansion valve; 180-a second electronic expansion valve; 190-outdoor heat exchanger; 210-an ambient temperature sensor; 220-ambient humidity sensor; 230-electric heating; 231-an exhaust valve; 240-expansion tank; 250-variable frequency water pump; 260-water flow switch; 270-a safety valve;
910-an acquisition module; 920-a judgment module; 930 — an adjustment module.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the prior art, as shown in fig. 1, when a heat pump system is operated to heat (water), when the outdoor temperature is high, the humidity is high, and the temperature of the inlet water is low, the temperature of the cooling U-tube of the refrigerant is lower than the outdoor dew pointTemperature T 2 In this case, condensed water is formed on the cooling U-shaped tube, and the control plate 110 is easily burned out when water drops slide down to the control plate 110. For example, the temperature of outdoor 24 deg.C and humidity 90% (the dew point temperature can be calculated as 22 deg.C), starting heating operation, and if the temperature of inlet water is 10 deg.C, the temperature T of refrigerant liquid pipe is 1 Generally, the temperature is slightly higher than about 3 ℃, namely about 13 ℃ of the refrigerant entering the refrigerant cooling U pipe, and is far lower than the outdoor dew point temperature by 22 ℃, so that the condensation of the refrigerant cooling U pipe is caused. Along with the heating (water) operation of the heat pump system, the inlet water temperature is higher and higher, and the temperature T of the refrigerant liquid pipe is the same 1 Will also be higher and higher when the temperature T of the refrigerant liquid pipe is higher 1 And no condensation risk exists after the temperature is higher than the outdoor dew point temperature. But often at the refrigerant tube temperature T 1 Before rising, dew condensation has already occurred, so the present application mainly addresses this problem.
In the present embodiment, as shown in fig. 2, a refrigerant side of the heat pump system includes a refrigerant cooling pipe 160, a first electronic expansion valve 170 and a second electronic expansion valve 180, a water side includes a water heater having an electric heater 230, the heat pump system further includes a heat pump system anti-condensation control device, the refrigerant cooling pipe 160 is used for cooling the control board 110, the first electronic expansion valve 170 is connected in series with the refrigerant cooling pipe 160, the second electronic expansion valve 180 is connected in parallel with the first electronic expansion valve 170 and the refrigerant cooling pipe 160, and the heat pump system anti-condensation control device is used for controlling the first electronic expansion valve 170, the second electronic expansion valve 180 and the water heater. In addition, as shown in fig. 2, the electric heater 230 is provided with an exhaust valve 231, the water side of the heat pump system further includes an expansion tank 240, a variable frequency water pump 250, a water flow switch 260 and a safety valve 270, and the structure and the working principle thereof are all the prior art and are not described again.
The condensation prevention control method for a heat pump system provided in this embodiment is applied to the heat pump system with a water heater as shown in fig. 3, and when a control board is at risk of condensation, the first electronic expansion valve and the second electronic expansion valve may be adjusted, and the method for heating water by synchronously adjusting electric heating on the water side (i.e., the water heater side) includes:
and S302, acquiring the outdoor dew point temperature and the refrigerant liquid pipe temperature.
Specifically, in the present embodiment, the outdoor dew point temperature is calculated by the outdoor environment temperature measured by the environment temperature sensor 210 and the outdoor environment humidity measured by the environment humidity sensor 220; the coolant tube temperature is measured by a tube temperature sensor 140 mounted on the coolant tube.
S304, judging whether the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature.
And S306, if the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature, performing anti-condensation control, opening the second electronic expansion valve 180, and adjusting the valve step of the first electronic expansion valve 170 to be less than that of the second electronic expansion valve 180.
Specifically, the method for controlling condensation prevention of a heat pump system according to this embodiment may further determine whether the temperature of the refrigerant liquid pipe is greater than the outdoor dew point temperature, and if not, perform condensation prevention control.
Specifically, in the present embodiment, the refrigerant cooling pipe is a U-shaped pipe, but in other embodiments of the present application, the refrigerant cooling pipe is not limited thereto, and may be a pipe with other shapes, for example: the refrigerant cooling pipe is a coiled pipe. In addition, in this embodiment, the control board is a main control board, but in other embodiments of the present application, the control board may also be a sub-control board.
In the condensation prevention control method for the heat pump system provided by the embodiment, the temperature of the refrigerant liquid pipe is compared with the outdoor dew point temperature, and when the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature, a condensation prevention measure is taken to open the second electronic expansion valve connected with the refrigerant cooling pipe in parallel, and the valve step of the first electronic expansion valve connected with the refrigerant cooling pipe in series is controlled to be smaller than that of the second electronic expansion valve, so that most of the refrigerant flows through the second electronic expansion valve, and only a small part of the refrigerant flows through the first electronic expansion valve and the refrigerant cooling pipe, thereby effectively preventing all the refrigerants from flowing through the first electronic expansion valve and the refrigerant cooling pipe, further controlling the temperature of the refrigerant cooling pipe not to be too low, and heating the refrigerant cooling pipe by using the heat of a heating device of the control board; meanwhile, when the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature, the electric heating of the water heater is started, the electric heating supplies water for heating, the circulating water temperature can be increased, and after the water temperature rises, the water exchanges heat with the refrigerant, the temperature of the refrigerant can be increased, and then the temperature of the refrigerant cooling pipe is increased.
Preferably, the control method provided in this embodiment further includes: when the electric heating of the water heater is started, the variable frequency water pump is started. Under this technical scheme, the frequency conversion water pump can accelerate hydrologic cycle rate to can transmit the heat of water to the refrigerant as early as possible, and then make the refrigerant cooling tube heat up fast.
Specifically, the condensation prevention control method for a heat pump system provided in this embodiment further includes: and if the temperature of the refrigerant liquid pipe is higher than the outdoor dew point temperature, opening the first electronic expansion valve and closing the second electronic expansion valve. When the temperature of the refrigerant liquid pipe is higher than the outdoor dew point temperature, the refrigerant liquid pipe is free of condensation risk, so that the normal control can be realized, the refrigerant can flow through the first electronic expansion valve and the refrigerant cooling pipe, and the cooling effect of the refrigerant cooling pipe on the control panel is fully utilized.
Specifically, the method for controlling condensation prevention of a heat pump system provided by this embodiment further includes: judging whether the temperature of a refrigerant liquid pipe is less than or equal to the outdoor dew point temperature or not in the process of carrying out anti-condensation control; and if the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature, gradually reducing the opening degree of the first electronic expansion valve until the temperature of the refrigerant liquid pipe is greater than the outdoor dew point temperature. In the process of condensation prevention control, if the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature, the condensation risk of the refrigerant liquid pipe is shown, the opening degree of the first electronic expansion valve is reduced, the flow of the refrigerant flowing through the first electronic expansion valve and the refrigerant cooling pipe can be further reduced, the temperature reduction phenomenon of the refrigerant cooling pipe can be relieved, and under the action of heat of a control panel heating device, electric heating of a water system and the like, the temperature of the refrigerant cooling pipe is increased to be higher than the outdoor dew point temperature as soon as possible, and the generation of condensation is prevented.
More specifically, in the present embodiment, the step of gradually decreasing the opening degree of the first electronic expansion valve includes: closing the first electronic expansion valve at a preset speed, for example: switch 10B per minute.
Specifically, the condensation prevention control method for a heat pump system provided in this embodiment further includes: in the process of anti-condensation control, if the temperature of the refrigerant liquid pipe is higher than the outdoor dew point temperature, the current situation is maintained. If the temperature of the refrigerant liquid pipe is higher than the outdoor dew point temperature in the process of anti-condensation control, the refrigerant liquid pipe has no condensation risk, and the current situation is maintained, namely the opening degrees of the first electronic expansion valve and the second electronic expansion valve are maintained unchanged, and the electric heating state of the water heater is maintained unchanged.
Specifically, the condensation prevention control method for a heat pump system provided in this embodiment further includes: in the process of maintaining the present situation, it is determined whether the temperature of the refrigerant liquid pipe is greater than or equal to the sum of the outdoor dew point temperature and a preset temperature, wherein the preset temperature is greater than zero, for example: the preset temperature may be 5 ℃; and if the temperature of the refrigerant liquid pipe is more than or equal to the sum of the outdoor dew point temperature and the preset temperature, the anti-condensation control is quitted. In the process of carrying out anti-condensation control, if the refrigerant liquid pipe temperature is higher than the outdoor dew point temperature by a certain temperature, the temperature of the refrigerant liquid pipe is really higher, the probability that the refrigerant liquid pipe falls to the outdoor dew point temperature in a short time is lower, and the risk that the refrigerant liquid pipe generates condensation is also low, so that at the moment, a strategy of quitting the anti-condensation control is adopted, the cold quantity of the refrigerant liquid pipe can be fully utilized to cool the control panel, and the cooling effect on the control panel is improved.
Specifically, the condensation prevention control method for a heat pump system provided in this embodiment further includes: in the process of maintaining the current situation, if the temperature of the refrigerant liquid pipe is less than the sum of the outdoor dew point temperature and the preset temperature difference, the current situation is continuously maintained. In the process of performing the anti-condensation control, if the temperature of the refrigerant liquid pipe is higher than the outdoor dew point temperature, but the temperature difference does not reach the preset temperature, it indicates that the temperature of the refrigerant liquid pipe is not high enough, the possibility that the temperature is reduced to the outdoor dew point temperature in a short time after the anti-condensation control is quitted is relatively high, the risk of condensation of the refrigerant liquid pipe is high, and therefore, the current situation is continuously maintained.
Fig. 4 shows a flowchart of the condensation prevention control method for the heat pump system provided in this embodiment, and as shown in fig. 4, the control flow of the control method is as follows:
when the heat pump system is operated for heating (water), S402 is executed to judge T 1 ＞T 2 If the temperature is established, judging whether the temperature of the refrigerant liquid pipe is higher than the outdoor dew point temperature;
if T 1 ＞T 2 If yes, namely the temperature of the refrigerant liquid pipe is higher than the outdoor dew point temperature, S404 is executed, the second electronic expansion valve is closed, and the first electronic expansion valve is throttled;
if T 1 ＞T 2 If the temperature of the refrigerant liquid pipe is not equal to or lower than the outdoor dew point temperature, which indicates that the refrigerant cooling pipe has a condensation risk, S406 is executed to perform condensation prevention control;
specifically, S408 is executed, the second electronic expansion valve is opened, the valve step of the first electronic expansion valve is less than that of the second electronic expansion valve, and the electric heating is started;
s410, judging T 1 ＞T 2 Whether the temperature of the refrigerant liquid pipe is higher than the outdoor dew point temperature or not is judged, namely, whether the second electronic expansion valve is opened or not is judged under the condition that the valve step of the first electronic expansion valve is less than that of the second electronic expansion valve;
if T is 1 ＞T 2 If the second electronic expansion valve is opened and the step of the first electronic expansion valve is less than the step of the second electronic expansion valve, the temperature of the liquid pipe of the refrigerant is still less than or equal to the outdoor dew point temperature, which indicates that the refrigerant cooling pipe still has the risk of condensation, so S412 is executed, and the first electronic expansion valve is closed for 10B every minute until T 1 ＞T 2 ；
If T 1 ＞T 2 If the second electronic expansion valve is opened and the first electronic expansion valve step is less than the second electronic expansion valve step, the temperature of the refrigerant liquid pipe is higher than the outdoor dew point temperature, S414 is executed to maintain the current situation, that is, the first electronic expansion valve and the second electronic expansion valve both maintain the current opening degree;
S416judgment of T 1 ≥T 2 +5, namely, judging whether the temperature of the refrigerant liquid pipe is higher than the outdoor dew point temperature by more than 5 ℃ under the condition of maintaining the current situation;
if T 1 ≥T 2 If +5 is not established, the temperature of the refrigerant liquid pipe is higher than the outdoor dew point temperature, but the condensation prevention control is not enough to quit, so the current situation is continuously maintained;
if T 1 ≥T 2 If +5 is true, it means that the refrigerant liquid pipe temperature is relatively high and the risk of condensation is low, so S418 is executed to exit the condensation prevention control.
In summary, the present embodiment adds an expansion valve in the heat pump system, connects the expansion valve in parallel to the system, and provides a control method for the refrigerant-liquid pipe temperature T measured by the pipe temperature sensor 140 1 And outdoor dew point temperature T 2 Judging whether there is a risk of condensation, wherein T 2 The condensation problem can be effectively solved when heating (water) is operated.
In particular when there is no risk of condensation (T) 1 ＞T 2 ) And the second electronic expansion valve is closed. The refrigerant discharged from the compressor 120 is cooled by the plate heat exchanger 130 (through which the water pipe 230 passes from the plate heat exchanger 130), cooled by the refrigerant cooling U-tube for the main control board, throttled by the first electronic expansion valve, and then enters the outdoor heat exchanger 190 for evaporation, thereby completing the circulation;
when condensation risks exist (T1 is less than or equal to T2), the second electronic expansion valve is opened, most of the refrigerant discharged by the compressor 120 is cooled by the plate heat exchanger 130, and is throttled by the second electronic expansion valve, the valve step of the first electronic expansion valve is smaller than that of the second electronic expansion valve, and only a small part of the refrigerant is guaranteed to be cooled by the refrigerant cooling U pipe to the main control board; then the refrigerants passing through the two expansion valves meet and enter the outdoor heat exchanger 190 to be evaporated, thereby completing the cycle.
Synchronously, when there is the condensation risk, the electrical heating in the automatic opening water system, through the electrical heating feedwater heating to promote circulation temperature. When the electric heating is started, the variable frequency water pump is started, so that the water circulation quantity is increased, and the circulation is accelerated; when the water temperature rises, the water exchanges heat with the refrigerant in the plate heat exchanger, and the temperature of the refrigerant, namely the temperature detected by the liquid pipe temperature sensor, can be increased. Therefore, the anti-condensation control can be accelerated to exit, and the condensation risk of the main control panel is reduced.
A check valve assembly 150, including four check valves, is further disposed between the refrigerant liquid pipe and the first electronic expansion valve 170, the second electronic expansion valve 180, and the refrigerant cooling pipe 160, so as to ensure that the refrigerant always passes through the main control board and then the electronic expansion valves no matter the refrigerant pipe is used for cooling or heating.
The valve step of the first electronic expansion valve 170 is controlled to be much smaller than that of the second electronic expansion valve 180, so that only a small amount of refrigerant passes through the refrigerant cooling U-tube. Under the condition that the heating device of the main control panel heats, the temperature of the refrigerant in the refrigerant cooling U pipe is increased to be higher than the dew point temperature of the environment (through T) 1 And T 2 The difference further controls the valve step of the first electronic expansion valve 170, thereby controlling the flow rate of the refrigerant entering the refrigerant cooling U-tube. The lower the flow rate is, the easier the temperature of the refrigerant is heated to be higher than the dew point temperature by the device), and the generation of condensation is avoided.
In short, the following points can be summarized:
1. the heat pump system heats (water) and operates, firstly, T is judged 1 And T 2 If T is 1 ≤T 2 And if so, carrying out condensation risk and entering anti-condensation control. Otherwise, the condensation risk is avoided, and the control is normal (the second electronic expansion valve is closed).
2. Specifically, after entering the anti-condensation control, the second electronic expansion valve is opened, and the valve step for controlling the first electronic expansion valve is smaller than that of the second electronic expansion valve, so that a small amount of refrigerant passes through the refrigerant cooling U pipe to dissipate heat for the main control panel. Further, with T 1 ＞T 2 The valve step of the first electronic expansion valve is adjusted for the purpose.
And detecting whether the electric heating and the water pump are started or not, and automatically starting the electric heating and the water pump in the water system if the electric heating and the water pump are not actively started by a user.
And if the user turns on the electric heating and the water pump, the execution is preferentially performed according to the setting of the user.
3. When T is 1 ≥T 2 +5, exitAnd (4) condensation prevention function.
And after the condensation is withdrawn, if the user does not actively start the electric heating, the electric heating in the water system is automatically closed. If the user actively starts the electric heating, the electric heating is executed according to the setting of the user.
Wait for T 1 ≤T 2 And then re-entering the anti-condensation control.
Namely, the second electronic expansion valve is added, and a corresponding control method is provided, so that the problem of condensation of the cooling medium cooling U pipe when the heat pump heats water is solved, and the controller can be prevented from being burnt.
The heat pump system condensation prevention control device according to the present embodiment can implement the control method described above, and as shown in fig. 5, the control device includes: the system comprises an acquisition module 910, a judgment module 920 and an adjustment module 930, wherein the acquisition module 910 is used for acquiring an outdoor dew point temperature and a refrigerant liquid pipe temperature; the judging module 920 is configured to judge whether the temperature of the refrigerant liquid pipe is less than or equal to an outdoor dew point temperature; the adjusting module 930 is configured to perform condensation prevention control, open the second electronic expansion valve, adjust the valve step of the first electronic expansion valve to be smaller than the valve step of the second electronic expansion valve, and start electrical heating of the water heater if the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature; the first electronic expansion valve is connected with the refrigerant cooling pipe in series, and the second electronic expansion valve is connected with the first electronic expansion valve and the refrigerant cooling pipe in parallel; the water heater is located on the water side of the heat pump system. The control device provided in this embodiment can implement the control method described above, so that all the beneficial effects of the control method described above can be obtained, and therefore, the description thereof is omitted here.
The present embodiment also provides a computer-readable storage medium, where a computer program is stored, and when the computer program is read and executed by a processor, the method for controlling condensation prevention of a heat pump system as described above is implemented. In the computer-readable storage medium provided in this embodiment, when the stored computer program runs, the control method can be implemented, so that all the beneficial effects of the control method can be obtained, and details are not described herein.
Finally, it should also be noted that, in this document, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to the embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The condensation prevention control method of the heat pump system is characterized by being applied to the heat pump system, wherein a refrigerant side of the heat pump system comprises a refrigerant cooling pipe, a first electronic expansion valve and a second electronic expansion valve, the refrigerant cooling pipe is used for cooling a control panel, the first electronic expansion valve is connected with the refrigerant cooling pipe in series, and the second electronic expansion valve is connected with the first electronic expansion valve and the refrigerant cooling pipe in parallel; the water side of the heat pump system includes a water heater having electrical heating; the control method comprises the following steps:
acquiring the outdoor dew point temperature and the temperature of a refrigerant liquid pipe;
judging whether the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature or not;
if the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature, performing condensation prevention control, opening the second electronic expansion valve, adjusting the valve step of the first electronic expansion valve to be less than that of the second electronic expansion valve, and starting the electric heating of the water heater.
2. The heat pump system anti-condensation control method according to claim 1, characterized by further comprising:
and if the temperature of the refrigerant liquid pipe is higher than the outdoor dew point temperature, opening the first electronic expansion valve and closing the second electronic expansion valve.
3. The heat pump system anti-condensation control method according to claim 1, further comprising:
in the process of carrying out anti-condensation control, judging whether the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature;
and if the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature, gradually reducing the opening degree of the first electronic expansion valve until the temperature of the refrigerant liquid pipe is greater than the outdoor dew point temperature.
4. The heat pump system anti-condensation control method according to claim 3, wherein the step of gradually decreasing the opening degree of the first electronic expansion valve includes: and closing the first electronic expansion valve at a preset speed.
5. The heat pump system anti-condensation control method according to claim 3, characterized by further comprising:
and in the process of carrying out anti-condensation control, if the temperature of the refrigerant liquid pipe is greater than the outdoor dew point temperature, maintaining the current situation.
6. The heat pump system anti-condensation control method according to claim 5, further comprising:
in the process of maintaining the current situation, judging whether the temperature of the refrigerant liquid pipe is more than or equal to the sum of the outdoor dew point temperature and a preset temperature, wherein the preset temperature is more than zero;
and if the temperature of the refrigerant liquid pipe is more than or equal to the sum of the outdoor dew point temperature and the preset temperature, the anti-condensation control is quitted.
7. The heat pump system anti-condensation control method according to claim 6, further comprising:
and in the process of maintaining the current situation, if the temperature of the refrigerant liquid pipe is less than the sum of the outdoor dew point temperature and the preset temperature difference, the current situation is continuously maintained.
8. A heat pump system anti-condensation control apparatus capable of implementing the control method according to any one of claims 1 to 6, the control apparatus comprising:
the acquisition module is used for acquiring the outdoor dew point temperature and the temperature of the refrigerant liquid pipe;
the judging module is used for judging whether the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature;
the adjusting module is used for performing condensation prevention control, opening the second electronic expansion valve, adjusting the valve step of the first electronic expansion valve to be smaller than that of the second electronic expansion valve and starting the electric heating of the water heater if the temperature of the refrigerant liquid pipe is less than or equal to the outdoor dew point temperature; the heat pump system comprises a heat pump system, a first electronic expansion valve, a second electronic expansion valve, a refrigerant cooling pipe, a first electronic expansion valve, a second electronic expansion valve and a control panel, wherein the refrigerant cooling pipe, the first electronic expansion valve and the second electronic expansion valve are all positioned on the refrigerant side of the heat pump system, the refrigerant cooling pipe is used for cooling the control panel, the first electronic expansion valve is connected with the refrigerant cooling pipe in series, and the second electronic expansion valve is connected with the first electronic expansion valve and the refrigerant cooling pipe in parallel; the water heater is located on the water side of the heat pump system.
9. A heat pump system is characterized in that a refrigerant side of the heat pump system comprises a refrigerant cooling pipe, a first electronic expansion valve and a second electronic expansion valve, a water side of the heat pump system comprises a water heater, the water heater is electrically heated, the heat pump system further comprises the heat pump system condensation prevention control device according to claim 7, the refrigerant cooling pipe is used for cooling a control panel, the first electronic expansion valve is connected with the refrigerant cooling pipe in series, the second electronic expansion valve is connected with the first electronic expansion valve and the refrigerant cooling pipe in parallel, and the heat pump system condensation prevention control device is used for controlling the first electronic expansion valve, the second electronic expansion valve and the water heater.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when read and executed by a processor, implements the heat pump system anti-condensation control method according to any one of claims 1 to 6.
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| CN202211413367.7A CN115773613A (en) | 2022-11-11 | 2022-11-11 | Condensation prevention control method and device for heat pump system and heat pump system |
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| CN202211413367.7A CN115773613A (en) | 2022-11-11 | 2022-11-11 | Condensation prevention control method and device for heat pump system and heat pump system |
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| CN215808974U (en) * | 2021-07-29 | 2022-02-11 | 珠海格力电器股份有限公司 | Heat radiation structure of heat exchange system, heat exchange system and air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4308042A (en) * | 1980-04-11 | 1981-12-29 | Atlantic Richfield Company | Heat pump with freeze-up prevention |
| US20130152613A1 (en) * | 2010-09-30 | 2013-06-20 | Mitsubishi Electric Corporation | Air-conditioning apparatus |
| WO2017185733A1 (en) * | 2016-04-25 | 2017-11-02 | 广东美的暖通设备有限公司 | Air conditioning system and valve control method therefor |
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