CN113758071B - Anti-condensation control method for refrigerant heat dissipation module of water machine system - Google Patents
Anti-condensation control method for refrigerant heat dissipation module of water machine system Download PDFInfo
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- CN113758071B CN113758071B CN202111016369.8A CN202111016369A CN113758071B CN 113758071 B CN113758071 B CN 113758071B CN 202111016369 A CN202111016369 A CN 202111016369A CN 113758071 B CN113758071 B CN 113758071B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
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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
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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
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Abstract
The application relates to the technical field of coolant heat dissipation and condensation prevention, and provides a condensation prevention control method for a coolant heat dissipation module of a water machine system, wherein the condensation prevention control method comprises the steps of acquiring an ambient temperature and an inlet temperature of an inlet end of the coolant heat dissipation module; starting an anti-condensation mode when the ambient temperature is not less than the sum of the inlet temperature and a first compensation temperature; and exiting the condensation prevention mode under the condition that the difference between the upper limit temperature of the refrigerant heat dissipation module and the inlet temperature is not greater than a first preset temperature and/or the current water inlet temperature of the water machine is not less than the environment temperature. The condensation prevention control method provided by the embodiment of the application not only can effectively prevent the refrigerant heat dissipation module from forming condensation, but also can protect the water machine system while preventing condensation.
Description
Technical Field
The application relates to the technical field of coolant heat dissipation and condensation prevention, in particular to a condensation prevention control method for a coolant heat dissipation module of a water machine system.
Background
The heat pump cold/hot water machine system has a heating mode and a cooling mode to provide hot water or cold water to a user. In the related art, a coolant heat dissipation module is disposed in the water machine system, and the coolant heat dissipation module includes a coolant heat dissipation pipeline and an electric control device disposed on the coolant heat dissipation pipeline, and the coolant flowing through the coolant heat dissipation pipeline is used to dissipate heat of the electric control device.
Under the heating mode of water machine system, ambient temperature is higher relatively, and the temperature of refrigerant heat dissipation module is lower relatively, and under the condition that the temperature of refrigerant heat dissipation module is less than the dew point temperature of environment, refrigerant heat dissipation module can produce the condensation, and the condensation probably leads to problems such as electric control unit electric leakage or short circuit, causes the safety risk.
Disclosure of Invention
In view of this, the present application provides a method for controlling condensation prevention of a refrigerant heat dissipation module of a water machine system.
In order to achieve the above object, an embodiment of the present application provides a method for controlling condensation prevention of a refrigerant heat dissipation module of a water machine system, including:
acquiring the ambient temperature and the inlet temperature of the inlet end of the refrigerant heat dissipation module;
starting an anti-condensation mode when the ambient temperature is not less than the sum of the inlet temperature and a first compensation temperature;
and exiting the condensation prevention mode under the condition that the difference between the upper limit temperature of the refrigerant heat dissipation module and the inlet temperature is not greater than a first preset temperature and/or the current water inlet temperature of the water machine is not less than the environment temperature.
In some embodiments, the anti-condensation mode comprises:
increasing a first electronic expansion valve on the water machine side to a first upper limit step number;
and increasing the opening degree of a second electronic expansion valve at the outdoor heat exchanger side every other first period according to a preset step number.
In some embodiments, the increasing the opening degree of the second electronic expansion valve at the outdoor heat exchanger side every first period by a preset number of steps includes:
and increasing the second electronic expansion valve to a second upper limit step number.
In some embodiments, after increasing the first electronic expansion valve on the water machine side to a first upper limit number of steps, the anti-condensation mode comprises:
and reducing the rotating speed of the water pump according to the preset rotating speed every other second period.
In some embodiments, the reducing the rotation speed of the water pump at the preset rotation speed every second period includes:
and reducing the water pump to a lower limit rotating speed.
In some embodiments, after reducing the water pump to the lower limit rotation speed, the anti-condensation mode includes:
and keeping the first electronic expansion valve at a first upper limit step number, the second electronic expansion valve at a second upper limit step number and the water pump at a lower limit rotating speed for continuously operating for a first preset time.
In some embodiments, after maintaining the first electronic expansion valve at the first upper limit step number, the second electronic expansion valve at the second upper limit step number, and the water pump at the lower limit speed for the first preset time period, the anti-condensation mode includes:
and increasing the frequency of the compressor according to the preset frequency every third period.
In some embodiments, after increasing the frequency of the compressor at the preset frequency every third period, the anti-condensation mode includes:
increasing the compressor to an upper limit frequency.
In some embodiments, the first compensation temperature is between 0 ℃ and 5 ℃; and/or the presence of a gas in the gas,
the first preset temperature is between 2 and 5 ℃.
In some embodiments, after the anti-condensation mode is initiated, the anti-condensation control method comprises:
stopping the water machine system under the condition that the current outlet water temperature of the water machine is not less than the sum of the set outlet water temperature and the second compensation temperature of the water machine and meets a first preset condition, wherein the first preset condition is as follows: and the continuous operation time of the anti-condensation mode reaches a second preset time, and the ambient temperature is not less than the sum of the inlet temperature and the first compensation temperature.
In some embodiments, the second predetermined period of time is between 5min and 10 min; and/or the presence of a gas in the gas,
the second compensation temperature is 2-5 ℃.
In some embodiments, after stopping the water machine system, the anti-condensation control method includes:
and restarting the water machine system under the condition that the difference between the set water outlet temperature and the current water outlet temperature is not less than a second preset temperature and a second preset condition is met, wherein the second preset condition is as follows: and the continuous stopping time of the water machine system reaches a third preset time, and/or the difference between the inlet temperature and the environment temperature is not less than the condensation risk removing temperature.
In some embodiments, the third predetermined period of time is between 10min and 20 min; and/or the presence of a gas in the atmosphere,
the condensation risk relieving temperature is 2-5 ℃; and/or the presence of a gas in the gas,
the second preset temperature is between 2 and 5 ℃.
The condensation prevention control method provided by the embodiment of the application not only can effectively prevent the refrigerant heat dissipation module from forming condensation, but also can protect the water machine system while preventing condensation; the inlet temperature is corrected through the first compensation temperature, so that whether condensation risks exist or not is judged more accurately, and the judgment result is more accurate.
Drawings
Fig. 1 is a schematic structural diagram of a water machine system according to an embodiment of the present application;
fig. 2 is a block flow diagram of an anti-condensation control method in an embodiment of the present application.
Detailed Description
It should be noted that, in the present application, technical features in examples and embodiments may be combined with each other without conflict, and the detailed description in the specific embodiment should be understood as an explanation of the gist of the present application and should not be construed as an improper limitation to the present application. In the description of the embodiments of the present application, the orientation or positional relationship is that of the water machine system in normal use, it should be understood that these orientation terms are only used for convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present application.
In order to facilitate understanding of the anti-condensation control method provided in the embodiment of the present application, a description is first given to a water machine system provided in the embodiment of the present application, and the water machine system may execute the anti-condensation control method provided in the embodiment of the present application. The water machine system may be a heat pump cold/hot water machine system. For example, referring to fig. 1, the water machine system includes a water machine 20, a compressor 30, an outdoor heat exchanger 40, a refrigerant heat dissipation module 10, a water pump 50, a first electronic expansion valve 60, and a second electronic expansion valve 70. The refrigerant heat dissipation module 10 includes a refrigerant heat dissipation pipeline and an electric control device disposed on the refrigerant heat dissipation pipeline, the refrigerant heat dissipation pipeline is communicated with the water machine 20 and the outdoor heat exchanger 40, the refrigerant heat dissipation pipeline is used for circulating a refrigerant, and heat generated by the electric control device is taken away by the refrigerant circulating in the refrigerant heat dissipation pipeline to dissipate heat for the electric control device. The first electronic expansion valve 60 is disposed between the water machine 20 and the cooling pipe of the refrigerant, and the second electronic expansion valve 70 is disposed between the outdoor heat exchanger 40 and the cooling pipe of the refrigerant. The water pump 50 is connected to a water inlet end of the water machine 20 to supply water to the water machine 20. The compressor 30 may be connected to the outdoor heat exchanger 40 and the water machine 20 through a four-way valve 100, respectively.
The water machine 20, the compressor 30, the outdoor heat exchanger 40, the refrigerant heat dissipation pipeline, the water pump 50, the first electronic expansion valve 60 and the second electronic expansion valve 70 together form a heat exchange system in which the refrigerant can flow. When the water machine system is in a cooling mode or a heating mode and the water machine 20 and the outdoor heat exchanger 40 work, one of the water machine 20 and the outdoor heat exchanger 40 is an evaporator, the other of the water machine 20 and the outdoor heat exchanger 40 is a condenser, a refrigerant can be changed into a liquid state from a gas state by heat release in the condenser, and heat absorption in the evaporator is changed into a gas state from a liquid state. The refrigerant is compressed by the compressor 30 after heat exchange through the evaporator to be changed into high-pressure high-temperature gas, the high-pressure high-temperature gas is conveyed to the condenser through a pipeline to release heat and be changed into medium-temperature high-pressure liquid, the medium-temperature high-pressure liquid is sent to the first electronic expansion valve 60 and the second electronic expansion valve 70 through the pipeline, the first electronic expansion valve 60 and the second electronic expansion valve 70 perform throttling and pressure reduction to form low-temperature low-pressure gas-liquid mixture, and the low-temperature low-pressure gas-liquid mixture enters the evaporator again for heat exchange. The heat of the water flow in the water machine 20 is transferred to the outdoor air flow through the refrigerant by the continuous circulating heat exchange, so that the temperature rise or the temperature drop of the water flow in the water machine 20 is realized.
It is to be noted here that: the description of the embodiment of the water machine system provided by the embodiment of the application is similar to that of the embodiment of the anti-condensation control method, and the beneficial effects similar to those of the embodiment of the method are achieved. For technical details which are not disclosed in the embodiments of the water machine system of the present application, please refer to the description of the embodiments of the method of the present application for understanding.
Referring to fig. 1 and fig. 2, an embodiment of the present application provides a condensation prevention control method for a refrigerant heat dissipation module of a water machine system, where the condensation prevention control method includes:
s100: and acquiring the ambient temperature and the inlet temperature of the inlet end of the refrigerant heat dissipation module.
For example, referring to fig. 2, in an embodiment, the inlet temperature sensor 80 may be disposed at the inlet end of the refrigerant heat dissipation module 10 to detect the temperature of the inlet end of the refrigerant heat dissipation module 10. The inlet end of the refrigerant heat dissipation module 10 is the side where the refrigerant enters the refrigerant heat dissipation module 10 in the heating mode of the water dispenser system. That is, the inlet temperature sensor 80 is disposed between the refrigerant heat dissipation module 10 and the water machine 20, that is, the inlet temperature sensor 80 measures the temperature of the inlet end of the refrigerant heat dissipation module 10 in real time.
The ambient temperature is obtained in a non-limiting manner, and for example, in an embodiment, referring to fig. 2, an ambient temperature sensor 90 may be disposed on the outdoor heat exchanger 40 to detect the ambient temperature. Generally, the outdoor heat exchanger 40 is installed outside the house, and the ambient temperature is measured in real time by the ambient temperature sensor 90, which is simple to operate.
S200: and starting the anti-condensation mode under the condition that the ambient temperature is not less than the sum of the inlet temperature and the first compensation temperature.
On the one hand, factors such as the air humidity in the environment influence the dew point temperature at which condensation forms, i.e. the dew point temperature differs at different air humidities. Therefore, the first compensation temperature can be determined according to the air humidity, for example, the dew point temperatures at different air humidities are converted into the dew point temperature at the drying air, and the dew point temperature difference therebetween can be the first compensation temperature. Like this, to the different condition of air humidity, rectify the import temperature through first compensation temperature to judge more accurately whether there is condensation risk. On the other hand, since the refrigerant enters the refrigerant heat dissipation module 10 through the inlet end, the inlet temperature is higher than the outlet end temperature of the refrigerant heat dissipation module 10 and the middle area temperature of the refrigerant heat dissipation module 10, that is, the inlet temperature of the refrigerant at the inlet end of the refrigerant heat dissipation module 10 is higher than the temperatures at other positions of the refrigerant heat dissipation module 10, if the ambient temperature is greater than or equal to the sum of the inlet temperature and the first compensation temperature, the ambient temperature is inevitably greater than the sum of the outlet end temperature of the refrigerant heat dissipation module 10 and the first compensation temperature, and the ambient temperature is inevitably greater than the sum of the middle area temperature and the first compensation temperature of the refrigerant heat dissipation module 10, therefore, whether condensation risk exists is judged through the inlet temperature, compared with the outlet end temperature or the middle area temperature, the condition of delayed judgment is avoided, and the judgment result is more accurate.
In an embodiment, when the ambient temperature is lower than the sum of the inlet temperature and the first compensation temperature, it is determined that the refrigerant heat dissipation module 10 has no risk of condensation, and the water machine system can normally heat without starting the condensation prevention mode.
Like this, the water machine system is under the heating mode, if ambient temperature is greater than or equal to the sum of import temperature and first compensation temperature, and refrigerant heat dissipation module 10 has the condensation risk, and the water machine system starts the condensation mode of preventing to avoid refrigerant heat dissipation module 10 to generate the condensation, influence electrically controlled device's security.
The first compensation temperature is a natural number greater than or equal to zero.
S300: and exiting the condensation prevention mode under the condition that the difference between the upper limit temperature of the refrigerant heat dissipation module and the inlet temperature is not greater than a first preset temperature and/or the current water inlet temperature of the water machine is not less than the environment temperature.
The upper limit temperature of the refrigerant heat dissipation module 10 is the highest temperature that ensures the effective operation of the electric control device. The refrigerant heat dissipation module 10 is in danger of being burnt out when exceeding the upper limit temperature. The upper temperature limit is greater than the inlet temperature, and therefore, the first predetermined temperature is a natural number greater than or equal to zero. If the difference between the upper limit temperature and the inlet temperature is greater than a first preset temperature, the risk of burning the electric control device exists. Therefore, the difference between the upper limit temperature and the inlet temperature is controlled to be less than or equal to the first preset temperature so as to ensure the safe operation of the electric control device.
The current inlet water temperature of the water machine 20 refers to the real-time temperature of the water flow entering the water inlet of the water machine 20. For example, a water inlet temperature sensor may be provided at the water inlet of the water machine 20 to detect the current water inlet temperature.
Thus, if at least one of the difference between the upper limit temperature and the inlet temperature of the refrigerant heat dissipation module 10 is not greater than the first preset temperature and the current inlet water temperature of the water machine 20 is not less than the ambient temperature is satisfied, the anti-condensation mode is exited. For example, the condensation preventing mode may be exited when the difference between the upper limit temperature and the inlet temperature is not greater than the first preset temperature. For another example, the current inlet water temperature may not be less than the ambient temperature, and the anti-condensation mode is exited. For another example, the difference between the upper limit temperature and the inlet temperature is not greater than the first preset temperature, and the current inlet water temperature is not less than the ambient temperature, and the condensation preventing mode is exited. Thus, the water machine system is protected while preventing condensation.
The condensation prevention control method provided by the embodiment of the application not only can effectively prevent the refrigerant heat dissipation module 10 from forming condensation, but also can protect the water machine system while preventing condensation.
In an embodiment, before the obtaining of the ambient temperature and the inlet temperature of the inlet end of the refrigerant heat dissipation module, the method for controlling condensation prevention includes: and starting a heating mode of the water machine system.
Therefore, after the water machine system receives the heating starting instruction, the water machine system enters a heating mode. When the water machine system is in a heating mode, the water machine system monitors the inlet temperature and the ambient temperature so as to judge whether condensation risks exist in the whole heating process of the water machine system.
In one embodiment, when the water machine system is in the cooling mode, the refrigerant heat dissipation module 10 basically has no risk of condensation, and does not need to start the condensation prevention mode. That is, the water machine system may not monitor the ambient temperature and the inlet temperature in the cooling mode.
The first compensation temperature may be determined based on the air humidity. Illustratively, in one embodiment, the first compensation temperature is between 0 ℃ and 5 ℃. Illustratively, the first compensation temperature may be 0 ℃, 1 ℃, 2 ℃, 3 ℃, or 5 ℃, and so on. Like this, according to factors influence such as air humidity, rationally rectify the import temperature to judge more accurately whether there is the condensation risk.
In one embodiment, the first predetermined temperature is between 2 ℃ and 5 ℃. Illustratively, the first predetermined temperature may be 2 ℃, 3 ℃, 4 ℃, or 5 ℃, and so on. Therefore, the temperature of the refrigerant heat dissipation module 10 is prevented from approaching the upper limit temperature, and the risk of overheating the refrigerant heat dissipation module 10 is avoided.
In one embodiment, the anti-condensation mode comprises:
s210: and increasing the first electronic expansion valve on the water machine side to a first upper limit step number.
That is, the first electronic expansion valve 60 is opened to a larger opening degree in a shorter time, so that the flow rate of the refrigerant at the inlet end of the refrigerant heat dissipation module 10 can be rapidly increased, so as to effectively increase the inlet temperature in a shorter time.
It is understood that the first upper limit number of steps may be less than the limit number of steps of the first electronic expansion valve 60. The limit number of steps of the first electronic expansion valve 60 refers to the maximum number of steps of the first electronic expansion valve 60. The specific value of the first upper limit step number is not limited, for example, the limit step number of the first electronic expansion valve 60 is 2000 steps, and the first upper limit step number may be 1800 steps. For another example, the limit number of steps of the first electronic expansion valve 60 may be 500 steps, and the first upper limit number of steps may be 480 steps. Therefore, the flow rate of the refrigerant flowing through the first electronic expansion valve 60 can be increased to a greater extent, and the problem of instability caused by the fact that the first electronic expansion valve 60 is opened to a limit step number can be avoided.
S220: and increasing the opening degree of a second electronic expansion valve at the outdoor heat exchanger side every other first period according to a preset step number.
After the first electronic expansion valve 60 is adjusted, the opening degree of the second electronic expansion valve 70 is increased every first period according to the preset steps, so that the opening degree of the second electronic expansion valve 70 is gradually increased, the flow rate of the refrigerant is stably increased, the inlet temperature is stably increased, and the disorder of the water machine system is avoided.
In one embodiment, the predetermined number of steps is between 30 steps and 70 steps. Illustratively, the preset number of steps is 30 steps, 35 steps, 40 steps, 50 steps, 60 steps, 70 steps, or the like. Like this, on the one hand, can comparatively show increase refrigerant flow to effectively rise the inlet temperature, avoid refrigerant flow acceleration rate undersize, lead to the condition that can't effectively rise the inlet temperature. On the other hand, the opening degree of the second electronic expansion valve 70 can be increased smoothly and gradually, and the disorder of the water machine system caused by the sudden change of the refrigerant flow is avoided.
In one embodiment, the first period is between 8s and 11 s. Illustratively, the first period is 8s, 9s, 10s, 11s, or the like. Therefore, on one hand, it is avoided that the opening degree of the second electronic expansion valve 70 is increased slowly and the flow rate of the refrigerant is increased too slowly to effectively raise the inlet temperature due to the too long first period. On the other hand, the problem that the water machine system is disturbed due to sudden change of the opening degree of the second electronic expansion valve 70 and sudden change of the flow of the refrigerant caused by too short first period is avoided.
In one embodiment, the increasing the opening degree of the second electronic expansion valve at the outdoor heat exchanger side every first period by a preset number of steps includes:
s221: and increasing the second electronic expansion valve to a second upper limit step number.
The second upper limit number of steps may be less than the limit number of steps of the second electronic expansion valve 70. The limit number of steps of the second electronic expansion valve 70 refers to the maximum number of steps of the second electronic expansion valve 70. The specific value of the second upper limit step number is not limited, for example, the limit step number of the second electronic expansion valve 70 is 2000 steps, and the second upper limit step number may be 1800 steps. For another example, the limit number of steps of the second electronic expansion valve 70 may be 500 steps, and the second upper limit number of steps may be 480 steps. Therefore, the flow rate of the refrigerant flowing through the second electronic expansion valve 70 can be increased to a greater extent, and the problem of instability caused by the fact that the second electronic expansion valve 70 is opened to a limit step number can be avoided.
In one embodiment, after increasing the first electronic expansion valve on the water machine side to the first upper limit step number, the anti-condensation mode includes:
s230: and reducing the rotating speed of the water pump according to the preset rotating speed every other second period.
After the first electronic expansion valve 60 is adjusted, the rotation speed of the water pump 50 is reduced at every second period according to the preset rotation speed, so that the flow speed and the flow rate of the water flow in the water machine 20 are gradually reduced, and the inlet temperature is stably increased under the condition that the disorder of the water machine system is avoided.
It should be noted that there is no precedence relationship between step S220 and step 230. For example, step S220 may be performed first, and then step S230 may be performed. For another example, step S230 may be performed first, and then step S220 may be performed. For another example, step S230 and step 220 may be performed simultaneously.
In one embodiment, the second period is between 8s and 11 s. Illustratively, the second period is 8s, 9s, 10s, 11s, or the like. Therefore, on one hand, the situation that the rotation speed of the water pump 50 is reduced insufficiently due to too long second period and the water flow is decelerated too slowly to effectively raise the inlet temperature is avoided. On the other hand, the second period is prevented from being too short, so that the rotating speed of the water pump 50 and the water flow are prevented from suddenly changing, and the water machine system is prevented from being disordered.
The preset rotation speed may be determined by a preset ratio according to a difference between the maximum rotation speed and the minimum rotation speed of the water pump 50. In an embodiment, referring to fig. 1 and fig. 2, the predetermined ratio may be between 7% and 15%. Illustratively, the predetermined ratio is 7%, 8%, 10%, 12%, or 15%, etc. On the one hand, can reduce rivers flow comparatively showing to effectively rise the import temperature, avoid rivers flow to slow down the undersize, lead to the unable condition that effectively rises the import temperature. On the other hand, the revolution of the water pump 50 can be steadily and gradually reduced, and the disorder of a water machine system caused by the sudden change of the water flow is avoided.
In an embodiment, the reducing the rotation speed of the water pump according to the preset rotation speed every second period includes:
s231: and reducing the water pump to a lower limit rotating speed.
That is, the water pump 50 may be reduced to the lower limit rotation speed, and thus, the flow rate of the water flow is reduced to the lower limit flow rate. Thus, the inlet temperature is raised by adjusting the flow rate of the water flow while ensuring the heating function of the water machine system.
In one embodiment, after the reducing the water pump to the lower limit rotation speed, the anti-condensation mode includes:
s240: and keeping the first electronic expansion valve at a first upper limit step number, the second electronic expansion valve at a second upper limit step number and the water pump at a lower limit rotating speed for continuously operating for a first preset time.
That is, step S240 is implemented after steps S210, S221, and S231. Since the water machine system has a certain response time period to enter the steady state after the steps S210, S221 and S231 are performed, keeping the first electronic expansion valve 60 at the first upper limit step number, the second electronic expansion valve 70 at the second upper limit step number and the water pump 50 at the lower limit rotation speed for the first preset time period, the water machine system reaches the steady state within the first preset time period, so as to more accurately judge whether there is a condensation risk.
In one embodiment, the first predetermined time period is between 7s and 15 s. Illustratively, the first preset time period is 7s, 9s, 10s, 12s, 15s, or the like. Therefore, on one hand, the condensation risk of the refrigerant heat dissipation module 10 caused by too long first preset time can be avoided; and the situation that the water machine system cannot reach a stable state due to too short first preset time can be avoided, so that the accuracy of a judgment result is low.
In one embodiment, after the first electronic expansion valve is kept at the first upper limit step number, the second electronic expansion valve is kept at the second upper limit step number, and the water pump is kept at the lower limit rotating speed for a first preset time period, the anti-condensation mode includes:
s250: and increasing the frequency of the compressor according to the preset frequency every third period.
The frequency variation of the compressor 30 greatly affects the stability of the water machine system, and thus step S250 is performed after step S240 is performed. The frequency of the compressor 30 is increased, so that the circulation volume of the refrigerant can be increased to increase the inlet temperature, the temperature rise rate of the water temperature can be increased, and the retention time in the condensation risk interval can be shortened.
In one embodiment, the third period is between 8s and 11 s. Illustratively, the third period is 8s, 9s, 10s, 11s, or the like. In this way, on the one hand, the frequency of the compressor 30 is not increased enough and the refrigerant circulation amount is not enough due to the too long third period. On the other hand, the third period is prevented from being too short, and the frequency of the compressor 30 is suddenly changed to cause disorder of the water machine system.
In one embodiment, the predetermined frequency is between 5Hz and 15 Hz. Illustratively, the predetermined frequency is 5Hz, 6Hz, 8Hz, 10Hz, 13Hz, or 15Hz, etc. Thus, the frequency of the compressor 30 is increased more smoothly, and the inlet temperature is increased by adjusting the compressor 30 while ensuring stable heating of the water machine system.
In an embodiment, after increasing the frequency of the compressor at the preset frequency every third period, the anti-condensation mode includes:
s251: increasing the compressor to an upper frequency limit.
Thus, the refrigerant circulation amount can be increased to the upper limit, and the inlet temperature is increased by adjusting the compressor 30 under the condition of ensuring the stable heating of the water machine system.
In an embodiment, after the anti-condensation mode is started, the anti-condensation control method includes:
s400: stopping the water machine system under the condition that the current outlet water temperature of the water machine is not less than the sum of the set outlet water temperature and the second compensation temperature of the water machine and meets a first preset condition, wherein the first preset condition is as follows: and the continuous operation time of the anti-condensation mode reaches a second preset time, and the ambient temperature is not less than the sum of the inlet temperature and the first compensation temperature.
The set water outlet temperature can be set by a user according to the requirement. In the heating mode of the water machine system, the current outlet water temperature is usually greater than or equal to the set outlet water temperature, and the water machine system stops heating so as to avoid the influence on user experience caused by the fact that the current outlet water temperature exceeds the set outlet water temperature. During the operation of the anti-condensation mode, on one hand, since it is necessary to increase the opening degrees of the first and second electronic expansion valves 60 and 70, and to reduce the rotation speed of the water pump 50, etc. to increase the inlet temperature, the current outlet water temperature may be increased to some extent. In order to avoid that the current outlet water temperature exceeds the set outlet water temperature in a short time to cause the water machine system to stop in the condensation prevention mode, the set outlet water temperature is corrected through the second compensation temperature, and therefore the stop time of the water machine system is delayed.
On the other hand, the continuous operation duration of the anti-condensation mode reaches a second preset duration, in other words, within the time period of the second preset duration, the anti-condensation mode is continuously operated all the time, the first electronic expansion valve 60, the second electronic expansion valve 70, the water pump 50 and the like all reach the adjustment limit value, the ambient temperature is still not less than the sum of the inlet temperature and the first compensation temperature, that is, the refrigerant heat dissipation module 10 is still in the condensation risk, the water machine system is not heated any more by stopping the water machine system, condensation of the electric control device is avoided, the safety risk is reduced, and therefore the safety and the stability of the whole water machine system are guaranteed.
In one embodiment, the second predetermined time period is between 5min and 10 min. Illustratively, the second preset time period is 5min, 6min, 8min, 9min, 10min, or the like. Therefore, on one hand, the water machine system is prevented from being in the condensation risk for too long time, and on the other hand, the current outlet water temperature is guaranteed to be rapidly increased, so that the safety and the reliability of the water machine system are guaranteed.
In one embodiment, the second compensation temperature is between 2 ℃ and 5 ℃. Illustratively, the second compensation temperature may be 2 ℃, 3.5 ℃, 4 ℃, or 5 ℃, and so on. Therefore, the set outlet water temperature is corrected through the second compensation temperature, the stop time of the water machine system can be delayed, the current outlet water temperature is conveniently controlled within a reasonable range, and the influence on user experience caused by overhigh current outlet water temperature is avoided.
In one embodiment, after the water machine system is stopped, the anti-condensation control method includes:
s500: and restarting the water machine system under the conditions that the difference between the set outlet water temperature and the current outlet water temperature is not less than a second preset temperature and a second preset condition is met, wherein the second preset condition is as follows: and the continuous stopping time of the water machine system reaches a third preset time, and/or the difference between the inlet temperature and the environment temperature is not less than the condensation risk removing temperature.
After the water machine system is stopped, the heating mode and the condensation preventing mode are both stopped. In terms of heating of the water machine system, when the current outlet temperature of the water flow at the outlet end of the water machine 20 decreases and the difference between the set outlet temperature and the current outlet temperature is greater than or equal to the second preset temperature, the water flow at the outlet end of the water machine 20 needs to be heated, otherwise, the use of the water machine by a user is affected. That is, the water machine system needs to be restarted to heat, so as to avoid influencing the use of the user.
From the condensation prevention of refrigerant heat dissipation module 10, on the one hand, can be that the duration of the continuous stop of water machine system reaches the third preset duration, and in the time period of the third preset duration, the environment transfers heat to refrigerant heat dissipation module 10 to promote the inlet temperature, and thus, the environment transfers heat to refrigerant heat dissipation module 10, and the requirement that the environment temperature is less than the sum of the inlet temperature and the first compensation temperature is met, thereby removing the condensation risk. On the other hand, it is also possible that the difference between the inlet temperature and the ambient temperature is not less than the condensation risk elimination temperature, in other words, the inlet temperature is higher than the ambient temperature and the difference between the two is greater than or equal to the condensation risk elimination temperature, and thus, it is also possible to determine that there is no condensation risk. That is to say, when the continuous stop time of the water machine system reaches the third preset time and the difference between the inlet temperature and the ambient temperature is not less than the condensation risk removing temperature, and under at least one of the two conditions, it can be determined that there is no condensation risk, and the refrigerant heat dissipation module 10 can operate safely.
In summary, when at least one of the two conditions that the continuous stop time of the water machine system reaches the third preset time and the difference between the inlet temperature and the ambient temperature is not less than the condensation risk removing temperature is met, and the difference between the set outlet temperature and the current outlet temperature is not less than the second preset temperature is met, the water machine system can be restarted, and the water machine system can be reheated without the condensation risk in the refrigerant heat dissipation module 10.
In one embodiment, the third predetermined time period is between 10min and 20 min. Illustratively, the third predetermined time period is 10min, 12min, 15min, 20min, or the like. Therefore, on one hand, the refrigerant heat dissipation module 10 has enough duration to absorb heat from the environment to raise the temperature, and ensures that the inlet temperature is higher, thereby avoiding frequent stop or restart of the water machine system. On the other hand, the influence of overlong system downtime of the water machine on the current outlet water temperature of the water outlet end is avoided, and the user experience is good.
In one embodiment, the condensation risk release temperature is between 2 ℃ and 5 ℃. Illustratively, the condensation risk relief temperature is 2 ℃, 2.5 ℃, 3 ℃, or 5 ℃, and so forth. Therefore, after the water machine system is restarted, the refrigerant heat dissipation module 10 enters the condensation prevention mode within a short time, so that the refrigerant heat dissipation module 10 is free of condensation risk, and the safety and the reliability of the water machine system are guaranteed.
In one embodiment, the second predetermined temperature is between 2 ℃ and 5 ℃. Illustratively, the second predetermined temperature is 2 ℃, 2.5 ℃, 3 ℃, or 5 ℃, and so on. Therefore, on one hand, the current outlet temperature of the water flow at the water outlet end is ensured to be proper, and the problem that the water machine system is still in a halt state to influence the use of a user when the current outlet temperature is too low can be avoided. On the other hand, the water machine system is prevented from being restarted too fast, and the water machine system enters the condensation prevention mode again in a short time, so that the water machine system is stopped or restarted frequently.
In an embodiment, after the water machine system is stopped, the anti-condensation control method includes:
s600: recording the risk of condensation and reporting an error.
That is, by recording the risk of condensation and reporting an error, a subsequent operator or user may find the error to report for repair or repair.
In an embodiment, before obtaining the inlet temperature of the inlet end of the refrigerant heat dissipation module and the ambient temperature, the anti-condensation control method includes: and starting the water machine system. That is, the water machine system is powered on. Thus, the water machine system can enter a heating mode or a cooling mode.
In one embodiment, the anti-condensation control method includes:
s700: and shutting down the water machine system.
That is, the user may shut down the water machine system according to the need when the water machine 20 is not needed. For example, the water machine system may shut down the water machine system after receiving the heating shutdown instruction.
Another aspect of the embodiments of the present application provides a storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps in the anti-condensation control method in any one of the embodiments of the present application.
It should be noted that, in the embodiment of the present application, if the control method is implemented in the form of a software functional module and sold or used as a standalone product, the control method may also be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application, in essence or parts contributing to the related art, may be embodied in the form of a software product, where the computer software product is stored in a storage medium and includes several instructions to enable a water machine system to execute all or part of the anti-condensation control method described in the various embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read Only Memory (ROM), a magnetic disk, or an optical disk. Thus, embodiments of the present application are not limited to any specific combination of hardware and software.
The various embodiments/implementations provided herein can be combined with each other without contradiction.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (13)
1. A condensation prevention control method for a refrigerant heat dissipation module of a water machine system is characterized in that the water machine system comprises a water machine, an outdoor heat exchanger and a refrigerant heat dissipation module, the refrigerant heat dissipation module comprises a refrigerant heat dissipation pipeline and an electric control device arranged on the refrigerant heat dissipation pipeline, the refrigerant heat dissipation pipeline is communicated with the water machine and the outdoor heat exchanger, a first electronic expansion valve is arranged between the water machine and the refrigerant heat dissipation pipeline, a second electronic expansion valve is arranged between the outdoor heat exchanger and the refrigerant heat dissipation pipeline, a water pump is connected with a water inlet end of the water machine to supply water to the water machine, a compressor can be respectively connected with the outdoor heat exchanger and the water machine through a four-way valve, the water machine system is in a cooling mode or a heating mode, when the water machine and the outdoor heat exchanger work, one of the water machine and the outdoor heat exchanger is an evaporator, the other one of the water machine and the outdoor heat exchanger is a condenser, a refrigerant is compressed by the compressor after heat exchange through the evaporator to be high-pressure high-temperature gas, the high-pressure high-temperature gas is conveyed to the condenser through a pipeline to release heat and be changed into medium-temperature high-pressure liquid, the medium-temperature high-pressure liquid is conveyed to the first electronic expansion valve and the second electronic expansion valve through a pipeline, the first electronic expansion valve and the second electronic expansion valve are throttled and decompressed to form low-temperature low-pressure gas-liquid mixture, the low-temperature low-pressure gas-liquid mixture enters the evaporator again for heat exchange, the inlet end of the refrigerant heat dissipation module refers to the side of the refrigerant heat dissipation module where the refrigerant enters in the heating mode of the water machine system, and the refrigerant heat dissipation module comprises:
acquiring an ambient temperature and an inlet temperature of an inlet end of the refrigerant heat dissipation module;
starting an anti-condensation mode when the ambient temperature is not less than the sum of the inlet temperature and a first compensation temperature;
and exiting the condensation prevention mode under the conditions that the difference between the upper limit temperature of the refrigerant heat dissipation module and the inlet temperature is not greater than a first preset temperature and the current water inlet temperature of the water machine is not less than the environment temperature.
2. The anti-condensation control method according to claim 1, wherein the anti-condensation mode comprises:
increasing a first electronic expansion valve on the water machine side to a first upper limit step number;
and increasing the opening degree of a second electronic expansion valve at the outdoor heat exchanger side every other first period according to a preset step number.
3. The anti-condensation control method according to claim 2, wherein increasing the opening degree of the second electronic expansion valve on the outdoor heat exchanger side every first period in a preset number of steps includes:
and increasing the second electronic expansion valve to a second upper limit step number.
4. The anti-condensation control method according to claim 2, wherein the anti-condensation mode includes, after increasing the first electronic expansion valve on the water machine side to a first upper limit number of steps:
and reducing the rotating speed of the water pump according to the preset rotating speed every other second period.
5. The anti-condensation control method according to claim 4, wherein the reducing the rotation speed of the water pump according to the preset rotation speed every second period comprises:
and reducing the water pump to a lower limit rotating speed.
6. The anti-condensation control method according to claim 5, wherein the anti-condensation mode includes, after the water pump is reduced to the lower limit rotation speed:
and keeping the first electronic expansion valve at a first upper limit step number, the second electronic expansion valve at a second upper limit step number and the water pump at a lower limit rotating speed for continuously operating for a first preset time.
7. The anti-condensation control method according to claim 6, wherein after maintaining the first electronic expansion valve at the first upper limit step number, the second electronic expansion valve at the second upper limit step number and the water pump at the lower limit speed for the first preset time period, the anti-condensation mode comprises:
and increasing the frequency of the compressor according to the preset frequency every third period.
8. The anti-condensation control method according to claim 7, wherein the anti-condensation mode comprises, after increasing the frequency of the compressor at a preset frequency every third period:
increasing the compressor to an upper limit frequency.
9. The anti-condensation control method according to claim 1, wherein the first compensation temperature is between 0 ℃ and 5 ℃; and/or the presence of a gas in the gas,
the first preset temperature is between 2 ℃ and 5 ℃.
10. The anti-condensation control method according to claim 1, wherein after the anti-condensation mode is started, the anti-condensation control method comprises:
stopping the water machine system under the condition that the current outlet water temperature of the water machine is not less than the sum of the set outlet water temperature and the second compensation temperature of the water machine and meets a first preset condition, wherein the first preset condition is as follows: and the continuous operation time of the anti-condensation mode reaches a second preset time, and the ambient temperature is not less than the sum of the inlet temperature and the first compensation temperature.
11. The anti-condensation control method according to claim 10, wherein the second preset time is between 5min and 10 min; and/or the presence of a gas in the gas,
the second compensation temperature is 2-5 ℃.
12. The anti-condensation control method according to claim 10, wherein after stopping the water machine system, the anti-condensation control method comprises:
and restarting the water machine system under the condition that the difference between the set water outlet temperature and the current water outlet temperature is not less than a second preset temperature and a second preset condition is met, wherein the second preset condition is as follows: and the continuous stopping time of the water machine system reaches a third preset time, and/or the difference between the inlet temperature and the environment temperature is not less than the condensation risk removing temperature.
13. The anti-condensation control method according to claim 12, wherein the third preset time is 10-20 min; and/or the presence of a gas in the atmosphere,
the condensation risk relieving temperature is 2-5 ℃; and/or the presence of a gas in the gas,
the second preset temperature is between 2 ℃ and 5 ℃.
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