WO2021088202A1 - 热泵系统的智能除霜控制方法及系统 - Google Patents
热泵系统的智能除霜控制方法及系统 Download PDFInfo
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- WO2021088202A1 WO2021088202A1 PCT/CN2019/124771 CN2019124771W WO2021088202A1 WO 2021088202 A1 WO2021088202 A1 WO 2021088202A1 CN 2019124771 W CN2019124771 W CN 2019124771W WO 2021088202 A1 WO2021088202 A1 WO 2021088202A1
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- subsystems
- subsystem
- defrosting
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- control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
Definitions
- This application relates to the field of heat pump technology, and in particular to a method and system for intelligent defrosting control of a heat pump system.
- Ultra-low temperature air source heat pump (hereinafter referred to as low temperature heat pump) is an energy-saving and widely used heating equipment.
- low temperature heat pump When the surface temperature of the evaporator is lower than the dew point temperature of the air and less than 0°C, the fins of the evaporator will be frosted, resulting in heating The effect is affected and the defrost must be timely.
- low-temperature heat pumps With the popularization of low-temperature heat pumps, its superior energy-saving effects have been increasingly recognized by the market.
- the heating effect due to the attenuation of the heating capacity of the unit after frosting, the heating effect is poor, and water needs to be drawn during the defrosting process.
- the end heat source causes the water temperature to drop, especially in some areas with high moisture content in the air. During the defrosting period, the water temperature fluctuates greatly and it is difficult to meet user requirements, which has always restricted the promotion of low-temperature heat pumps.
- This application provides an intelligent defrosting control method and system for a heat pump system to solve the existing technical problem of large water temperature fluctuations during defrosting of low-temperature heat pumps.
- the embodiments of this application can avoid water temperature fluctuations during defrosting and ensure users' water demand And comfort.
- an embodiment of the present application provides a defrosting control method for a heat pump system.
- the heat pump system includes two sub-systems sharing a water-side heat exchanger.
- the defrosting control method includes:
- the method further includes:
- the actual value of the output water temperature of the water-side heat exchanger is controlled to be within the normal fluctuation range of the target value of the output water temperature of the water-side heat exchanger.
- the preset power value corresponding to the target value of the output water temperature of the water-side heat exchanger is used to control the system of the other subsystem as the target power.
- the steps of heat output power include:
- the power value corresponding to the target value is the heating output power of another subsystem in the target power control.
- the compressor of the other subsystem is started, and the preset power value corresponding to the target value of the output water temperature of the water-side heat exchanger is used.
- the step of target power controlling the heating output power of another subsystem includes:
- the one of the subsystems When it is detected that the one of the subsystems meets the defrost exit condition, the one of the subsystems is controlled to stand by, and the other one of the subsystems continues to operate in the heating mode.
- the step of controlling one of the sub-systems to perform a defrosting action specifically includes:
- the one subsystem is controlled to perform a defrosting action.
- the method further includes:
- control the compressor of one of the sub-systems When controlling one of the sub-systems to perform defrosting action, control the compressor of one of the sub-systems to increase the frequency to the second preset frequency, control the four-way valve of one of the sub-systems to energize and turn off the fan, and control
- the opening degree of the electronic expansion valve of one of the subsystems is to the defrost opening degree.
- the method further includes :
- the frequency of the one of the subsystems is reduced to a third preset frequency, the four-way valve of the one of the subsystems is controlled to lose power, and the one of the subsystems is controlled to lose power.
- the opening degree of the electronic expansion valve of a subsystem is to the heating opening degree to exit the defrosting state;
- the compressor of the one of the subsystems is controlled to turn off so that the one of the subsystems is on standby, and the other of the subsystems continues to operate in the heating mode.
- the step of controlling the heating output power of another subsystem in which the value is the target power includes:
- the one of the subsystems When it is detected that the one of the subsystems meets the defrost exit condition, the one of the subsystems is controlled to re-run the heating mode, and the other one of the subsystems continues to run the heating mode.
- the step of controlling one of the subsystems to perform a defrosting action specifically includes:
- the compressor of the other subsystem When the compressor of the other subsystem is up to the fifth preset frequency, control the one of the subsystems to perform the defrosting action, so as to match the preset output water temperature target of the water-side heat exchanger
- the power value corresponding to the value is the heating output power of the other subsystem in the target power control, wherein the heating output power is equal to the fifth preset frequency
- the one of the subsystems When it is detected that the one of the subsystems meets the defrost exit condition, the one of the subsystems is controlled to re-run the heating mode, and the other one of the subsystems continues to run the heating mode.
- the compressor of the other subsystem when the compressor of the other subsystem is increased to a fifth preset frequency, control one of the subsystems to perform a defrosting action, so as to exchange with the water side by a preset
- the power value corresponding to the target value of the output water temperature of the heater is the target power to control the heating output power of the other subsystem, wherein the step of the heating output power being equal to the fifth preset frequency specifically includes:
- control the compressor of one of the sub-systems When controlling one of the sub-systems to perform defrosting action, control the compressor of one of the sub-systems to increase the frequency to the sixth preset frequency, control the four-way valve of one of the sub-systems to energize and turn off the fan, and control The opening degree of the electronic expansion valve of one of the subsystems to the defrost opening degree;
- the step of controlling one of the subsystems to re-run the heating mode and the other one of the subsystems to continue to run the heating mode after detecting that one of the subsystems meets the defrost exit condition Specifically including:
- the frequency of one of the subsystems is reduced to the seventh preset frequency, the four-way valve of one of the subsystems is controlled to lose power and the fan is restarted, and control The opening degree of the electronic expansion valve of one of the subsystems to the heating opening degree to exit the defrosting state;
- control one of the subsystems After exiting the defrosting state, control one of the subsystems to re-run the heating mode.
- the method further includes:
- the present application also provides a defrost control system for a heat pump system, the heat pump system includes two sub-systems sharing a water-side heat exchanger, the control system includes a controller, and the controller is configured to:
- the controller is further configured to:
- the actual value of the output water temperature of the water-side heat exchanger is controlled to be within the normal fluctuation range of the target value of the output water temperature of the water-side heat exchanger.
- the controller is further configured to:
- the power value corresponding to the target value is the heating output power of another subsystem in the target power control.
- the controller is further configured to:
- the one of the sub-systems When it is detected that one of the sub-systems meets the defrost exit condition, the one of the sub-systems is controlled to stand by, and the other one of the sub-systems continues to run the heating mode.
- the controller is further configured to:
- the one subsystem is controlled to perform a defrosting action.
- the controller is further configured to:
- control the compressor of one of the sub-systems When controlling one of the sub-systems to perform defrosting action, control the compressor of one of the sub-systems to increase the frequency to the second preset frequency, control the four-way valve of one of the sub-systems to energize and turn off the fan, and control
- the opening degree of the electronic expansion valve of one of the subsystems is to the defrost opening degree.
- the controller is further configured to:
- the frequency of the one of the subsystems is reduced to a third preset frequency, the four-way valve of the one of the subsystems is controlled to lose power, and the one of the subsystems is controlled
- the opening degree of the electronic expansion valve of a subsystem is to the heating opening degree to exit the defrosting state;
- the compressor of the one of the subsystems is controlled to turn off so that the one of the subsystems is on standby, and the other of the subsystems continues to operate in the heating mode.
- the controller is further configured to:
- the one of the subsystems When it is detected that the one of the subsystems meets the defrost exit condition, the one of the subsystems is controlled to re-run the heating mode, and the other one of the subsystems continues to run the heating mode.
- the controller is further configured to:
- the compressor of the other subsystem When the compressor of the other subsystem is up to the fifth preset frequency, control the one of the subsystems to perform the defrosting action, so as to match the preset output water temperature target of the water-side heat exchanger
- the power value corresponding to the value is the heating output power of the other subsystem in the target power control, wherein the heating output power is equal to the fifth preset frequency
- the one of the subsystems When it is detected that the one of the subsystems meets the defrost exit condition, the one of the subsystems is controlled to re-run the heating mode, and the other one of the subsystems continues to run the heating mode.
- the controller is further configured to:
- control the compressor of one of the sub-systems When controlling one of the sub-systems to perform defrosting action, control the compressor of one of the sub-systems to increase the frequency to the sixth preset frequency, control the four-way valve of one of the sub-systems to energize and turn off the fan, and control The opening degree of the electronic expansion valve of one of the subsystems to the defrost opening degree;
- the controller is further configured to:
- the frequency of one of the subsystems is reduced to the seventh preset frequency, the four-way valve of one of the subsystems is controlled to lose power and the fan is restarted, and control The opening degree of the electronic expansion valve of one of the subsystems to the heating opening degree to exit the defrosting state;
- control one of the subsystems After exiting the defrosting state, control one of the subsystems to re-run the heating mode.
- the controller is further configured to:
- the present application provides an intelligent defrosting control method and system for a heat pump system, and any embodiment thereof has the following beneficial effects:
- the heating capacity degradation caused by it will be compensated by the other subsystem, so that one of the subsystems can be defrosted normally. It can also ensure that the output water temperature does not fluctuate during the defrosting process, thereby realizing continuous and uninterrupted operation of the heating mode, improving heating stability, and further ensuring the user's water demand and comfort, which is conducive to the popularization and application of low-temperature heat pumps.
- both sub-systems can continuously provide a higher-temperature refrigerant for the shared water-side heat exchanger to ensure the heat exchange effect of the water-side heat exchanger, so as to stabilize the hot water on the user side.
- Supply provides guarantee.
- the heating mode of the standby subsystem can be activated to make up for the attenuation of heating capacity when one of the subsystems enters the defrosting operation, so that the heat can be effectively maintained.
- the water output is stable; when both systems are running in heating mode, when one of the subsystems is in defrosting operation, the heating output capacity of the other subsystem is increased to maintain the heat output, so as to avoid fluctuations in water temperature. Ensure the user's water demand and comfort.
- Fig. 1 is a flow chart of the defrosting control method of the heat pump system according to the first embodiment of the present application
- FIG. 2 is a flow chart of the defrost control method of the heat pump system according to the first embodiment of the present application
- FIG. 3 is a flow chart of the defrost control method of the heat pump system according to the second embodiment of the present application.
- Fig. 4 is a flow chart of the defrosting control method of the heat pump system according to the third embodiment of the present application.
- the first embodiment of the present application provides a defrost control method for a heat pump system.
- the heat pump system includes two sub-systems sharing a water-side heat exchanger, and each sub-system has an independent air-side heat exchange.
- the two systems do not affect each other, that is, the startup and shutdown of any one system will not affect the safe operation of the other system.
- this embodiment provides a defrosting control method, which includes the steps:
- the defrosting operation is an important part of the defrosting mode operation.
- the refrigerant flow path is switched through the four-way valve to perform the heating and defrosting action of the evaporator.
- the frost action the high-temperature refrigerant of the subsystem will not have a heat exchange effect on the shared water-side heat exchanger.
- both subsystems can continuously provide a higher temperature refrigerant for the shared water-side heat exchanger to ensure the heat exchange effect of the water-side heat exchanger, thereby providing heat for the user Stable water supply provides guarantee.
- the heating capacity degradation caused by it will be compensated by the other subsystem, so that one of the subsystems can be defrosted normally, and it can be guaranteed during the defrosting process.
- the output water temperature does not fluctuate, thereby realizing the continuous and uninterrupted operation of the heating mode, improving the heating stability, and further ensuring the user's water demand and comfort, which is conducive to the popularization and application of low-temperature heat pumps.
- the defrosting control method further includes the steps:
- the actual value of the output water temperature of the water-side heat exchanger is also the actual value of the output water temperature of the heat pump system.
- the other subsystem should be controlled
- the heating output power of the heat pump system is increased, so that the actual value of the output water temperature of the heat pump system is maintained within the normal fluctuation range of the output water temperature target value (the output water temperature target value ⁇ the set temperature difference).
- step S1 when controlling one of the subsystems to perform the defrosting operation, use the preset power value corresponding to the target value of the output water temperature of the water-side heat exchanger as the target power
- steps of controlling the heating output power of another subsystem include:
- S10 When controlling one of the sub-systems to perform defrosting operation, start the compressor of the other sub-system or increase the frequency of the compressor of the other sub-system, and set the preset frequency with the water-side heat exchanger.
- the power value corresponding to the target value of the output water temperature is the target power to control the heating output power of another subsystem.
- the heating mode of the standby subsystem can be activated to make up for the attenuation of heating capacity when one of the subsystems enters the defrosting operation, so that the heat can be effectively maintained.
- the water output is stable; when both systems are running in heating mode, when one of the subsystems is in defrosting operation, the heating output capacity of the other subsystem is increased to maintain the heat output, so as to avoid fluctuations in water temperature. Ensure the user's water demand.
- step S10 one of the subsystems is controlled to perform defrosting.
- start the compressor of another subsystem and use the preset power value corresponding to the target value of the output water temperature of the water-side heat exchanger to control the heating output power of the other subsystem.
- the state of the two subsystems is determined according to the load demand.
- One of the subsystems is in the operating heating mode, and the other subsystem is in the standby state.
- one of the subsystems should be controlled to perform the defrosting action only after the other one of the subsystems has been activated and compensated for the attenuation of the heating capacity of the one of the subsystems.
- the defrosting operation is an important link in the operation of the defrosting mode. After the subsystem enters the defrosting preparation state, the refrigerant flow path is switched through the four-way valve to perform the heating and defrosting action of the evaporator. During the defrosting action, The high-temperature refrigerant of the subsystem will not have a heat exchange effect on the shared water-side heat exchanger.
- This embodiment realizes the alternate operation heating mode and alternate defrosting between the two subsystems.
- the other subsystem in the standby state will be awakened and activated, and repeat Steps S12 to S14 are executed, and this cycle is repeated.
- step S13 after controlling one of the sub-systems to enter the defrost preparation state, start the other one of the sub-systems, and use the preset target value of the output water temperature of the water-side heat exchanger.
- the step of controlling one of the subsystems to perform the defrosting action specifically includes:
- step S133 when the heating output power of the other subsystem reaches the target power, controlling one of the subsystems to perform a defrosting action, the method further includes:
- control the compressor of one of the sub-systems When controlling one of the sub-systems to perform defrosting action, control the compressor of one of the sub-systems to increase the frequency to the second preset frequency, control the four-way valve of one of the sub-systems to energize and turn off the fan, and control
- the opening degree of the electronic expansion valve of one of the subsystems is to the defrost opening degree.
- step S14 when it is detected that one of the subsystems meets the defrost exit condition, one of the subsystems is controlled to stand by, and the other one of the subsystems continues to operate.
- the method further includes:
- the frequency of the one of the subsystems is reduced to a third preset frequency, the four-way valve of the one of the subsystems is controlled to lose power, and the one of the subsystems is controlled
- the opening degree of the electronic expansion valve of a subsystem is to the heating opening degree to exit the defrosting state;
- the compressor of the one of the subsystems is controlled to turn off so that the one of the subsystems is on standby, and the other of the subsystems continues to operate in the heating mode.
- Step 1 The heat pump system is turned on and running, and according to the load demand, it is determined that only the system A is turned on, and the system B is in a standby state.
- Step 2 System A requests to enter the defrost, computer control system A enters the defrost preparation state, and system B is awakened at the same time.
- Step 3 After the system A receives and enters the defrost preparation state, the compressor of the system A is reduced to the first preset frequency Fdefstart (Fdefstart is a preset parameter, which is obtained through laboratory test data and needs to meet the requirements of the compressor When operating at this frequency, the compressor discharge pressure-suction pressure ⁇ P, P is a preset threshold, determined according to the pressure difference during safe operation in the compressor specification), and then wait for the system B to be awakened.
- Fdefstart is a preset parameter, which is obtained through laboratory test data and needs to meet the requirements of the compressor
- the compressor discharge pressure-suction pressure ⁇ P, P is a preset threshold, determined according to the pressure difference during safe operation in the compressor specification
- Step 4 After the system B receives the wake-up signal, it immediately starts and outputs according to the target power control capability corresponding to the target value of the output water temperature, which can compensate for the attenuation of the system A's ability after frequency reduction at this time.
- Step 5 After detecting the successful wake-up of system B, control system A officially enters the defrosting action.
- Step 6 When the system A enters the defrosting action, the compressor of the system A is increased to the second preset frequency Fdefrun (Fdefrun is a preset parameter, which is obtained through laboratory test data and needs to meet the requirements of the compressor for defrosting. After frost, when running at this frequency, the defrost can defrost cleanly), turn off the fan, the four-way valve is energized, and open the electronic expansion valve to the defrost opening degree.
- Fdefrun is a preset parameter, which is obtained through laboratory test data and needs to meet the requirements of the compressor for defrosting.
- frost when running at this frequency, the defrost can defrost cleanly
- the four-way valve is energized, and open the electronic expansion valve to the defrost opening degree.
- Step 7 After the system A officially enters the defrost, as the defrost causes the water temperature to drop, the system B will automatically increase the frequency, increase the capacity output, and further compensate for the attenuation of the unit's capacity, so that the water temperature remains constant and does not fluctuate.
- Step 8 System A enters the defrost exit state after reaching the defrost exit condition.
- Step 9 The compressor of system A is reduced to the third preset frequency FdefEnd (FdefEnd is a preset parameter, which is obtained through laboratory test data, and needs to meet the requirement of running at this frequency after the compressor exits defrosting.
- Compressor discharge pressure-suction pressure ⁇ P, P is a preset threshold value, determined according to the pressure difference during safe operation in the compressor specification), the electronic expansion valve returns to the initial opening, and the four-way valve loses power.
- Step 10 After the system A exits the defrost, the compressor is turned off, leaving only the system B to continue to run in the heating mode.
- Step 11 When the system B needs to enter the defrost, repeat the above steps to wake up the system A in this cycle.
- the third embodiment of the present application realizes further optimization.
- the step of controlling the heating output power of another subsystem of the compressor frequency with the preset power value corresponding to the target value of the output water temperature of the water-side heat exchanger as the target power specifically includes :
- the state of the two subsystems is judged according to the load demand, and the two subsystems are in the running heating mode.
- one of the subsystems should be controlled to perform the defrosting action only after the compressor of the other subsystem increases the output power and compensates for the attenuation of the heating capacity of the one subsystem.
- the defrosting operation is an important link in the operation of the defrosting mode. After the subsystem enters the defrosting preparation state, the refrigerant flow path is switched through the four-way valve to perform the heating and defrosting action of the evaporator. During the defrosting action, The high-temperature refrigerant of the subsystem will not have a heat exchange effect on the shared water-side heat exchanger.
- This embodiment realizes the simultaneous operation of heating mode and alternate defrosting between the two sub-systems.
- the other sub-system in operation is immediately increased in frequency and repeated Steps S16 to S18 are executed, and this cycle is repeated.
- step S17 after controlling one of the sub-systems to enter the defrost preparation state, increase the compressor frequency of the other one of the sub-systems, and then set the frequency with the water-side heat exchanger at a preset value.
- the power value corresponding to the target value of the output water temperature is the target power after controlling the heating output power of the other subsystem, and then the step of controlling one of the subsystems to perform a defrosting action specifically includes:
- step S173 when the compressor of the other sub-system is up to the fifth preset frequency, control one of the sub-systems to perform a defrosting action, thereby pre-
- the power value corresponding to the target value of the output water temperature of the water-side heat exchanger is assumed to be the target power to control the heating output power of the other subsystem, wherein the heating output power is equal to the fifth preheater
- the steps to set the frequency include:
- control the compressor of one of the sub-systems When controlling one of the sub-systems to perform defrosting action, control the compressor of one of the sub-systems to increase the frequency to the sixth preset frequency, control the four-way valve of one of the sub-systems to energize and turn off the fan, and control The opening degree of the electronic expansion valve of one of the subsystems to the defrost opening degree;
- step S18 when it is detected that one of the sub-systems meets the defrost exit condition, the one sub-system is controlled to re-run the heating mode, and the other sub-system is
- the steps for the system to continue operating in heating mode include:
- the frequency of one of the subsystems is reduced to the seventh preset frequency, the four-way valve of one of the subsystems is controlled to lose power and the fan is restarted, and control The opening degree of the electronic expansion valve of one of the subsystems to the heating opening degree to exit the defrosting state;
- control one of the subsystems After exiting the defrosting state, control one of the subsystems to re-run the heating mode.
- the method further includes:
- Step 1 The heat pump system starts up and runs, and according to the load demand, both system A and system B are in running state.
- Step 2 System A requests to enter the defrosting request, and the computer control system A enters the defrosting preparation state.
- Step 3 After the system A receives and enters the defrost preparation state, the compressor of the system A is reduced to the fourth preset frequency Fdefstart (Fdefstart is a preset parameter, which is obtained through laboratory test data and needs to meet the compressor operation At this frequency, the compressor discharge pressure-suction pressure ⁇ P, P is a preset threshold, which is determined according to the pressure difference during safe operation in the compressor specification), and the compressor of system A is down-frequency caused by the unit The capacity drops, resulting in a drop in water temperature. At this time, the compressor of system B immediately increases (synchronizes) to the fifth preset frequency, so as to compensate for the decrease in capacity of system A at this time.
- Fdefstart is a preset parameter, which is obtained through laboratory test data and needs to meet the compressor operation
- ⁇ P, P is a preset threshold, which is determined according to the pressure difference during safe operation in the compressor specification
- the compressor of system A is down-frequency caused by the unit The capacity drops, resulting in a drop in water
- Step 4 After the system B receives the frequency increase of the system A, when the water temperature has been maintained, the system A officially enters the defrosting action.
- Step 5 System A enters the defrosting action, and the compressor frequency is increased to the sixth preset frequency Fdefrun (Fdefrun is a preset parameter, which is obtained through laboratory test data, and needs to meet the requirements of the compressor after defrosting. At this frequency, the defrost can defrost cleanly), turn off the fan, the four-way valve is energized, and open the electronic expansion valve to the defrost opening degree.
- Fdefrun is a preset parameter, which is obtained through laboratory test data, and needs to meet the requirements of the compressor after defrosting. At this frequency, the defrost can defrost cleanly), turn off the fan, the four-way valve is energized, and open the electronic expansion valve to the defrost opening degree.
- Step 6 Assuming that system A is in the defrosting process, before exiting the defrosting process, system B also proposes to enter the defrosting request at this time, the computer saves the defrosting request of system B, but does not respond to the defrosting request of system B, system B Keep running.
- Step 7 System A enters the defrost exit state after reaching the defrost exit condition.
- Step 8 Frequency reduction of system A to the seventh preset frequency FdefEnd (FdefEnd is a preset parameter, which is obtained through laboratory test data, and needs to meet the requirement that after the compressor exits defrosting, when the compressor runs at this frequency, the compressor discharge Air pressure-suction pressure ⁇ P, P is a preset threshold, which is determined by the pressure difference during safe operation in the compressor specification), the electronic expansion valve returns to the initial opening, the four-way valve loses power, and the fan restarts.
- the system A compressor increases the frequency and restarts heating.
- Step 9 If system B does not send a defrost request, the compressor of system B will automatically reduce the frequency until the water temperature reaches a constant value.
- Step 10 System B sends a defrost request during the defrosting period of system A. At this time, it responds to the defrost request of system B.
- the compressor of system B is reduced to Fdefstart (Fdefstart is one).
- the preset parameter which is obtained through laboratory test data, needs to meet the compressor discharge pressure-suction pressure ⁇ P when the compressor is running at this frequency, and P is a preset threshold value, according to the compressor specification
- the pressure difference during safe operation is determined), due to the decrease of the unit capacity due to the frequency reduction of the system B, which leads to the decrease of the water temperature.
- the frequency of the system A immediately increases to compensate for the attenuation of the capacity after the frequency reduction of the system B at this time.
- Step 11 After the system B reaches the defrost exit condition, it enters the defrost exit state.
- Step 12 The frequency of system B is reduced to FdefEnd, the electronic expansion valve returns to the initial opening, the four-way valve loses power, and the fan restarts.
- the system B compressor increases the frequency and restarts heating.
- System A automatically reduces the frequency until the water temperature reaches a constant level.
- Step 13 But when the system sends out a defrost request again, repeat the above steps.
- the present application also provides a defrost control system suitable for the above-mentioned defrost control method.
- the heat pump system includes a controller and two sub-systems sharing a water-side heat exchanger.
- the control system includes a controller, and The controller is configured to:
- the controller is further configured to:
- the actual value of the output water temperature of the water-side heat exchanger is controlled to be within the normal fluctuation range of the target value of the output water temperature of the water-side heat exchanger.
- the controller is further configured to:
- the power value corresponding to the target value is the heating output power of another subsystem in the target power control.
- the controller is further configured to:
- the one of the subsystems When it is detected that the one of the subsystems meets the defrost exit condition, the one of the subsystems is controlled to stand by, and the other one of the subsystems continues to operate in the heating mode.
- the controller is further configured to:
- the one subsystem is controlled to perform a defrosting action.
- the controller is further configured to:
- control the compressor of one of the sub-systems When controlling one of the sub-systems to perform defrosting action, control the compressor of one of the sub-systems to increase the frequency to the second preset frequency, control the four-way valve of one of the sub-systems to energize and turn off the fan, and control
- the opening degree of the electronic expansion valve of one of the subsystems is to the defrost opening degree.
- the controller is further configured to:
- the frequency of the one of the subsystems is reduced to a third preset frequency, the four-way valve of the one of the subsystems is controlled to lose power, and the one of the subsystems is controlled
- the opening degree of the electronic expansion valve of a subsystem is to the heating opening degree to exit the defrosting state;
- the compressor of the one of the subsystems is controlled to turn off so that the one of the subsystems is on standby, and the other of the subsystems continues to operate in the heating mode.
- the controller is further configured to:
- the one of the subsystems When it is detected that the one of the subsystems meets the defrost exit condition, the one of the subsystems is controlled to re-run the heating mode, and the other one of the subsystems continues to run the heating mode.
- the controller is further configured to:
- the compressor of the other subsystem When the compressor of the other subsystem is up to the fifth preset frequency, control the one of the subsystems to perform the defrosting action, so as to match the preset output water temperature target of the water-side heat exchanger
- the power value corresponding to the value is the heating output power of the other subsystem in the target power control, wherein the heating output power is equal to the fifth preset frequency
- the one of the subsystems When it is detected that the one of the subsystems meets the defrost exit condition, the one of the subsystems is controlled to re-run the heating mode, and the other one of the subsystems continues to run the heating mode.
- the controller is further configured to:
- control the compressor of one of the sub-systems When controlling one of the sub-systems to perform defrosting action, control the compressor of one of the sub-systems to increase the frequency to the second preset frequency, control the four-way valve of one of the sub-systems to energize and turn off the fan, and control The opening degree of the electronic expansion valve of one of the subsystems to the defrost opening degree;
- the controller is further configured to:
- the frequency of the one of the subsystems is reduced to the sixth preset frequency, the four-way valve of the one of the subsystems is controlled to lose power and the fan is restarted, and control The opening degree of the electronic expansion valve of one of the subsystems to the heating opening degree to exit the defrosting state;
- control one of the subsystems After exiting the defrosting state, control one of the subsystems to re-run the heating mode.
- the controller is further configured to:
- This application provides a defrosting control system for a heat pump system.
- the heating capacity degradation caused by it will be compensated by the other sub-system, so that one of the sub-systems
- the system can defrost normally, and can ensure that the output water temperature does not fluctuate during the defrosting process, so as to realize the continuous and uninterrupted operation of the heating mode, improve the heating stability, and further ensure the user's water demand and comfort, which is beneficial to Popularization and application of low temperature heat pumps.
- the device embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physically separate. Units can be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
- the connection relationship between the modules indicates that they have a communication connection between them, which can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art can understand and implement it without creative work.
Abstract
Description
Claims (13)
- 一种热泵系统的除霜控制方法,其特征在于,所述热泵系统包括共用一水侧换热器的二子系统,所述除霜控制方法包括:在控制其中一子系统进行除霜操作时,以预设的与所述水侧换热器的输出水温目标值对应的功率值为目标功率控制其中另一子系统的制热输出功率。
- 如权利要求1所述的热泵系统的除霜控制方法,其特征在于,所述方法还包括:控制所述水侧换热器的输出水温实际值在所述水侧换热器的输出水温目标值的正常波动范围内。
- 如权利要求1或2所述的热泵系统的除霜控制方法,其特征在于,所述在控制其中一子系统进行除霜操作时,以预设的与所述水侧换热器的输出水温目标值对应的功率值为目标功率控制其中另一子系统的制热输出功率的步骤,具体包括:在控制其中一子系统进行除霜操作时,启动其中另一子系统的压缩机或升高其中另一子系统的压缩机频率,并以预设的与所述水侧换热器的输出水温目标值对应的功率值为目标功率控制其中另一子系统的制热输出功率。
- 如权利要求3所述的热泵系统的除霜控制方法,其特征在于,所述在控制其中一子系统进行除霜操作时,启动其中另一子系统的压缩机,以预设的与所述水侧换热器的输出水温目标值对应的功率值为目标功率控制其中另一子系统的制热输出功率的步骤,具体包括:在所述热泵系统运行时,控制其中一子系统运行制热模式,而其中另一子系统待机;当接收到所述其中一子系统发出的除霜请求时,则控制所述其中一子系统运行除霜模式;在控制所述其中一子系统进入除霜准备状态后,启动所述其中另一子系统,在以预设的与所述水侧换热器的输出水温目标值对应的功率值为目标功率控制所述其中另一子系统的制热输出功率后,控制所述其中一子系统进行除霜动作;当检测到所述其中一子系统满足除霜退出条件后,控制所述其中一子系统待机,而所述其中另一子系统继续运行制热模式。
- 如权利要求4所述的热泵系统的除霜控制方法,其特征在于,所述在控制所述其中一子系统进入除霜准备状态后,启动所述其中另一子系统,在以预设的与所述水侧换热器的输出水温目标值对应的功率值为目标功率控制所述其中另一子系统的制热输出功率后,控制所述其中一子系统进行除霜动作的步骤,具体包括:根据所述其中一子系统发出的除霜请求控制所述其中一子系统进入除霜准备状态,并唤醒所述其中另一子系统;在控制所述其中一子系统进入除霜准备状态后,控制所述其中一子系统的压缩机降频至第一预设频率,并控制所述其中另一子系统的压缩机升频以使所述其中另一子系统的制热输出功率达到与所述水侧换热器的输出水温目标值对应的功率值;当所述其中另一子系统的制热输出功率达到所述目标功率时,控制所述其中一子系统进行除霜动作。
- 如权利要求5所述的热泵系统的除霜控制方法,其特征在于,所述当所述其中另一子系统的制热输出功率达到所述目标功率时,控制所述其中一子系统进行除霜动作,所述方法还包括:当控制所述其中一子系统进行除霜动作时,控制所述其中一子系统的压缩机升频至第二预设频率,控制所述其中一子系统的四通阀通电并关闭风机,控制所述其中一子系统的电子膨胀阀的开度至除霜开度。
- 如权利要求4所述的热泵系统的除霜控制方法,其特征在于,所述当检测到所述其中一子系统满足除霜退出条件后,控制所述其中一子系统待机,而所述其中另一子系统继续运行制热模式,所述方法还包括:当检测到所述其中一子系统满足除霜退出条件后,控制所述其中一子系统降频至第三预设频率,控制所述其中一子系统的四通阀失电,控制所述其中一子系统的电子膨胀阀的开度至制热开度,以退出除霜状态;在退出所述除霜状态后,控制所述其中一子系统的压缩机关闭以使所述其中一子系统待机,而所述其中另一子系统继续运行制热模式。
- 如权利要求3所述的热泵系统的除霜控制方法,其特征在于,所述在控制其中一子系统进行除霜操作时,升高其中另一子系统的压缩机频率,以预设的与所述水侧换热器的输出水温目标值对应的功率值为目标功率控制其中另一子系统的制热输出功率的步骤,具体包括:在所述热泵系统运行时,控制其中一子系统、其中另一子系统运行制热模式;当接收到所述其中一子系统发出的除霜请求时,则控制所述其中一子系统运行除霜模式;在控制所述其中一子系统进入除霜准备状态后,升高所述其中另一子系统的压缩机频率,在以预设的与所述水侧换热器的输出水温目标值对应的功率值为目标功率控制所述其中另一子系统的制热输出功率后,控制所述其中一子系统进行除霜动作;当检测到所述其中一子系统满足除霜退出条件后,控制所述其中一子系统重新运 行制热模式,而所述其中另一子系统继续运行制热模式。
- 如权利要求8所述的热泵系统的除霜控制方法,其特征在于,所述在控制所述其中一子系统进入除霜准备状态后,升高所述其中另一子系统的压缩机频率,在以预设的与所述水侧换热器的输出水温目标值对应的功率值为目标功率控制所述其中另一子系统的制热输出功率后,控制所述其中一子系统进行除霜动作的步骤,具体包括:根据所述其中一子系统发出的除霜请求控制所述其中一子系统进入除霜准备状态;在控制所述其中一子系统进入除霜准备状态后,控制所述其中一子系统的压缩机降频至第四预设频率,同时控制所述其中另一子系统的压缩机升频至第五预设频率;当所述其中另一子系统的压缩机升频至第五预设频率时,控制所述其中一子系统进行除霜动作,从而以预设的与所述水侧换热器的输出水温目标值对应的功率值为目标功率控制所述其中另一子系统的制热输出功率,其中,所述制热输出功率等于所述第五预设频率;当检测到所述其中一子系统满足除霜退出条件后,控制所述其中一子系统重新运行制热模式,而所述其中另一子系统继续运行制热模式。
- 如权利要求9所述的热泵系统的除霜控制方法,其特征在于,所述当所述其中另一子系统的压缩机升频至第五预设频率时,控制所述其中一子系统进行除霜动作,从而以预设的与所述水侧换热器的输出水温目标值对应的功率值为目标功率控制所述其中另一子系统的制热输出功率,其中,所述制热输出功率等于所述第五预设频率的步骤,具体包括:当所述其中另一子系统的压缩机升频至第五预设频率时,控制所述其中一子系统进行除霜动作;当控制所述其中一子系统进行除霜动作时,控制所述其中一子系统的压缩机升频至第六预设频率,控制所述其中一子系统的四通阀通电并关闭风机,控制所述其中一子系统的电子膨胀阀的开度至除霜开度;以预设的与所述水侧换热器的输出水温目标值对应的功率值为目标功率控制所述其中另一子系统的制热输出功率,所述制热输出功率等于所述第五预设频率。
- 如权利要求8所述的热泵系统的除霜控制方法,其特征在于,所述当检测到所述其中一子系统满足除霜退出条件后,控制所述其中一子系统重新运行制热模式,而所述其中另一子系统继续运行制热模式的步骤,具体包括:当检测到所述其中一子系统满足除霜退出条件后,控制所述其中一子系统降频至第七预设频率,控制所述其中一子系统的四通阀失电并重启风机,控制所述其中一子 系统的电子膨胀阀的开度至制热开度,以退出除霜状态;在退出所述除霜状态后,控制所述其中一子系统重新运行制热模式。
- 如权利要求8所述的热泵系统的除霜控制方法,其特征在于,所述方法还包括:在控制所述其中一子系统进行除霜动作且不满足除霜退出条件时,当接收到所述其中另一子系统发出的除霜请求时,保存却不响应所述其中另一子系统的除霜请求。
- 一种热泵系统的除霜控制系统,其特征在于,所述热泵系统包括共用一水侧换热器的二子系统,所述控制系统包括控制器,所述控制器被配置成:在控制其中一子系统进行除霜操作时,以预设的与所述水侧换热器的输出水温目标值对应的功率值为目标功率控制其中另一子系统的制热输出功率。
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