CN110793199A - Heat pump water heater system - Google Patents
Heat pump water heater system Download PDFInfo
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- CN110793199A CN110793199A CN201911085356.9A CN201911085356A CN110793199A CN 110793199 A CN110793199 A CN 110793199A CN 201911085356 A CN201911085356 A CN 201911085356A CN 110793199 A CN110793199 A CN 110793199A
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- refrigerant pipeline
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1818—Arrangement or mounting of electric heating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H2250/00—Electrical heat generating means
- F24H2250/08—Induction
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- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention provides a heat pump water heater system, which comprises a compressor, a throttling component, a first heat exchanger, a second heat exchanger and a first energy storage device, wherein the compressor is provided with an air inlet and an air outlet; the first heat exchanger is connected between the air inlet and the throttling component; the second heat exchanger is provided with a first refrigerant pipeline and a first water inlet pipeline, and the first refrigerant pipeline is connected between the exhaust port and the throttling component; the first energy storage device is provided with a second water inlet pipeline, and the second water inlet pipeline is connected in series with the water outlet end of the first water inlet pipeline. According to the heat pump water heater system provided by the embodiment of the invention, the second heat exchanger and the first energy storage device are combined, so that twice heating of water flow can be realized, the quick heating effect is improved, and the water tank attached to the traditional heat pump water heater can be eliminated, so that the energy consumption is saved, the development cost is reduced, the floor area of the heat pump water heater system is reduced, and the bacterial growth is reduced.
Description
Technical Field
The invention relates to the technical field of air conditioner manufacturing, in particular to a heat pump water heater system.
Background
The water heaters in the market at present mainly comprise four types, namely solar water heaters, gas water heaters, electric water heaters and heat pump water heaters. The solar water heater utilizes natural energy and has the characteristic of energy conservation, but the heating effect of the solar water heater is greatly influenced by weather; the gas water heater and the electric water heater have good quick heating effect, but the energy waste is serious, and the national guidelines for energy conservation and emission reduction are not met. The traditional heat pump water heater uses electric energy to drive and utilizes an air heat source to heat water, has the advantage of energy saving, but has the defects of poor quick heating effect, large occupied area, easy bacteria breeding in a water tank and the like.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art.
To this end, one aspect of the present invention provides a heat pump water heater system.
In view of the above, according to one aspect of the present invention, there is provided a heat pump water heater system, the heat pump water heater system comprising a compressor, a throttling component, a first heat exchanger, a second heat exchanger and a first energy storage device, the compressor being provided with an air inlet and an air outlet; the first heat exchanger is connected between the air inlet and the throttling component; the second heat exchanger is provided with a first refrigerant pipeline and a first water inlet pipeline, and the first refrigerant pipeline is connected between the exhaust port and the throttling component; the first energy storage device is provided with a second water inlet pipeline, and the second water inlet pipeline is connected in series with the water outlet end of the first water inlet pipeline.
The heat pump water heater system provided by the embodiment of the invention is characterized in that a compressor, a second heat exchanger, a throttling part and a first heat exchanger are sequentially connected into a refrigerant circulating system, the second heat exchanger is provided with a first refrigerant pipeline for passing a refrigerant and a first water inlet pipeline for passing water flow, high-temperature refrigerant discharged from the compressor releases heat and condenses in the first refrigerant pipeline, heat can be transferred to the water flow in the first water inlet pipeline, and therefore, the water is directly heated. The heat pump water heater system also comprises a first energy storage device which can accumulate heat and is provided with a second water inlet pipeline, and the second water inlet pipeline is connected with the first water inlet pipeline in series, so that the water flow flowing out of the first water inlet pipeline can be heated continuously in the second water inlet pipeline, and the heating effect is fully ensured. By combining the second heat exchanger and the first energy storage device, the heat pump water heater system provided by the embodiment of the invention can realize twice heating of water flow, improves the quick heating effect, and can cancel a water tank attached to a traditional heat pump water heater, so that the energy consumption is saved, the development cost is reduced, the floor area of the heat pump water heater system is reduced, and the bacterial growth is reduced.
In addition, the heat pump water heater system provided by the technical scheme of the invention also has the following additional technical characteristics:
in one possible design, the first energy storage device is provided with a second refrigerant pipeline, and the second refrigerant pipeline is connected with the first refrigerant pipeline in parallel.
In the design, the first energy storage device is also provided with a second refrigerant pipeline which is connected with the first refrigerant pipeline in parallel, namely, the high-temperature refrigerant discharged by the compressor can also flow through the second refrigerant pipeline to transfer heat to the first energy storage device, and at the moment, the high-temperature exhaust of the compressor can be used for supplying heat to the first energy storage device, so that the first energy storage device is ensured to have a stable heat source, an additional heat storage heat source is not required to be arranged, the heating of water can be directly completed by using the exhaust of the compressor, and the structure of the heat pump water heater system is facilitated to be simplified.
In one possible design, the heat pump water heater system further includes a memory configured to store a computer program and a processor; the processor is configured to execute the computer program to implement: and controlling the on-off of the first refrigerant pipeline and the second refrigerant pipeline.
In the design, the heat pump water heater system further comprises a storage and a processor, so that on-off control over the first refrigerant pipeline and the second refrigerant pipeline is achieved, whether water is heated by the second heat exchanger or not can be selected, whether heat is supplemented for the first energy storage device or not can be selected, and flexible control over the heat pump water heater system is achieved.
In one possible design, the heat pump water heater system further comprises: and the water outlet pipeline is connected with the second water inlet pipeline in parallel.
In the design, a water outlet pipeline connected with the second water inlet pipeline in parallel is further arranged in the heat pump water heater system, different water flow paths can be realized by selecting one of the water outlet pipeline and the second water inlet pipeline to be communicated, and different heating schemes can be adopted to meet different heating requirements. Specifically, when the water outlet pipeline is communicated, water enters from the first water inlet pipeline and then flows out from the water outlet pipeline without flowing through the second water inlet pipeline, so that the water is heated only by the second heat exchanger; when the second water inlet pipeline is conducted, water can continuously flow into the second water inlet pipeline and then flow out after entering from the first water inlet pipeline, and does not flow out from the water outlet pipeline, so that the water can be heated by the second heat exchanger and the first energy storage device successively.
In one possible design, the water outlet pipeline is provided with a first valve body, and the second water inlet pipeline is provided with a second valve body; the processor is further configured to execute the computer program to implement: and controlling the opening and closing of the first valve body and the second valve body according to the outlet water temperature.
In the design, the water outlet pipeline and the second water inlet pipeline are respectively provided with the first valve body and the second valve body, so that the on-off of the water outlet pipeline and the second water inlet pipeline can be conveniently realized by controlling the on-off of the water outlet pipeline and the second water inlet pipeline, and different water flow paths are realized. By configuring the processor to control the opening and closing of the first valve body and the second valve body according to the outlet water temperature, whether the current heating amount is enough or not can be determined according to the outlet water temperature, and then a reasonable water flow path is determined.
In one possible design, the processor is further configured to execute the computer program to implement: determining that the water temperature is smaller than a first water outlet threshold value, controlling the first valve body to close, and controlling the second valve body to open; and determining that the water temperature is greater than or equal to a second water outlet threshold, controlling the first valve body to open, controlling the second valve body to close, and controlling the second water outlet threshold to be greater than or equal to the first water outlet threshold.
In this design, how to control the opening and closing of the first valve body and the second valve body according to the outlet water temperature is specifically defined. When the outlet water temperature is lower than the first outlet water threshold value, the water temperature is considered to be still lower, the heating amount is insufficient, and the water can sequentially flow through the first water inlet pipeline and the second water inlet pipeline by controlling the closing of the first valve body and the opening of the second valve body, namely, the second heat exchanger and the first energy storage device are used for realizing the heating twice, so that the quick heating function is realized; when the water outlet temperature is larger than or equal to the second water outlet threshold value, the water temperature is considered to be high enough, the water enters a stable heating state, the water can only flow through the first water inlet pipeline by controlling the opening of the first valve body and the closing of the second valve body, the heating is realized by the second heat exchanger, and the heat stored by the first energy storage device is not utilized. Further, when the second water outlet threshold is greater than the first water outlet threshold, there is an intermediate temperature interval that is greater than or equal to the first water outlet threshold and less than the second water outlet threshold, and at this time, the first valve body may be controlled to be closed and the second valve body may be controlled to be opened, and the first valve body may also be controlled to be opened and the second valve body may also be closed, which is not limited herein.
In one possible design, the processor is further configured to execute the computer program to implement: and determining that the temperature of the water is always greater than or equal to a second water outlet threshold value within a preset time length, and controlling the first valve body to be opened and the second valve body to be closed.
In the design, when the water temperature is determined to be larger than or equal to the second water outlet threshold value, timing is carried out simultaneously, after the condition that the water temperature is determined to be higher is maintained for a preset time, the stable heating state is considered to be reached, misjudgment and improper control caused by temporary rising of the water outlet temperature can be avoided, and stable and sufficient water outlet is ensured.
In one possible design, the second water exit threshold is greater than the first water exit threshold, the processor being further configured to execute the computer program to: and determining that the water temperature is greater than or equal to the first water outlet threshold and less than the second water outlet threshold, and controlling the first valve body and the second valve body to keep the current opening and closing state.
In the design, how to control the opening and closing of the first valve body and the second valve body according to the outlet water temperature when the second outlet water threshold is larger than the first outlet water threshold is further limited. The water outlet temperature which is more than or equal to the first water outlet threshold and less than the second water outlet threshold is not too low, but is not high enough, the heating is considered to be in an unstable state at the moment, the current opening and closing state is kept by controlling the first valve body and the second valve body, the temperature interval which is more than or equal to the first water outlet threshold and less than the second water outlet threshold can be used as a buffer interval, frequent adjustment of the first valve body and the second valve body is avoided, and stable operation of the system is facilitated to be ensured.
In one possible design, the heat pump water heater system further comprises: the first end of the four-way valve is connected with the air inlet, the second end of the four-way valve is connected with the air outlet, the third end of the four-way valve is connected with one end of the first heat exchanger, which is far away from the throttling component, and the fourth end of the four-way valve is connected with one end of the first refrigerant pipeline, which is far away from the throttling component; and the second energy storage device is connected with the first refrigerant pipeline in parallel.
In the design, the four-way valve and the second energy storage device are additionally arranged in the system, so that the circulation direction of the refrigerant can be conveniently and rapidly adjusted, and different running modes are realized. Specifically, the first end is connected with the third end, the second end is connected with the fourth end, and the refrigerant can flow in sequence according to the compressor, the second heat exchanger, the throttling component, the first heat exchanger and the compressor as described above, so that the refrigerant is condensed and released in the second heat exchanger to heat water; the first end is connected with the fourth end, the second end is connected with the third end, a refrigerant can flow in sequence of the compressor, the first heat exchanger, the throttling component, the second energy storage device and the compressor, heat is condensed and released in the first heat exchanger, defrosting of the first heat exchanger is achieved, the second energy storage device is used for replacing the second heat exchanger, the refrigerant can absorb heat and evaporate in the second energy storage device, a heat source is provided for a defrosting process, system energy consumption is reduced, circulation reliability is guaranteed, heat of water flow cannot be absorbed, heating of water can be achieved through the first energy storage device, and therefore the function of heating water while defrosting is achieved.
In one possible design, the processor is further configured to execute the computer program to implement: controlling the conduction mode of the four-way valve to switch the heat pump water heater system between a pure heating mode and a defrosting heating mode; under the defrosting and heating mode, the second energy storage device is controlled to be conducted, and the first refrigerant pipeline and the second refrigerant pipeline are controlled to be disconnected; and under the pure heating mode, the on-off of the second energy storage device, the first refrigerant pipeline and the second refrigerant pipeline is controlled according to the exhaust temperature of the compressor.
In this design, the processor is further configured to control a conduction mode of the four-way valve to realize adjustment of the refrigerant circulation direction, so that the system is switched between different operation modes. Specifically, when the first end of the four-way valve is connected with the third end and the second end is connected with the fourth end, the system is in a pure heating mode, and at the moment, the exhaust heat can be reasonably selected and distributed according to the heat supply capacity of the compressor by controlling the on-off of the second energy storage device, the first refrigerant pipeline and the second refrigerant pipeline according to the exhaust temperature of the compressor. When the first end is connected with the fourth end, and the second end is connected with the third end, the system is in a defrosting and heating mode, at the moment, the second energy storage device is controlled to be conducted, the first refrigerant pipeline and the second refrigerant pipeline are controlled to be disconnected, the second energy storage device can be used for replacing the first refrigerant pipeline and the second refrigerant pipeline to release heat, and heat loss of the first refrigerant pipeline and the second refrigerant pipeline is avoided.
In one possible design, the processor executes a computer program to control the on/off of the second energy storage device, the first refrigerant pipeline and the second refrigerant pipeline according to the exhaust temperature of the compressor, and the method includes: determining that the exhaust temperature is less than a first exhaust threshold value, controlling the first refrigerant pipeline to be conducted, and controlling the second energy storage device and the second refrigerant pipeline to be disconnected; and determining that the exhaust temperature is greater than or equal to a second exhaust threshold value, and controlling the conduction of the second energy storage device, the first refrigerant pipeline and the second refrigerant pipeline, wherein the second exhaust threshold value is greater than the first exhaust threshold value.
In the design, the on-off of the second energy storage device, the first refrigerant pipeline and the second refrigerant pipeline is specifically limited according to the exhaust temperature of the compressor in the pure heating mode. When the exhaust temperature is lower than a lower first exhaust threshold value, the heat supply amount is still low at the moment, the second energy storage device and the second refrigerant pipeline are controlled to be disconnected by controlling the conduction of the first refrigerant pipeline, the heating of water can be preferentially met, and the reliability of heating water is ensured. When the exhaust temperature is greater than or equal to the higher second exhaust threshold value, the heat supply amount is sufficient at the moment, and the second energy storage device, the first refrigerant pipeline and the second refrigerant pipeline can be controlled to be conducted, so that on the premise of meeting the requirement of heating water, the first energy storage device and the second energy storage device are used for storing waste heat generated in the heating process of the system, and the functions of quick heating and defrosting and heating water simultaneously are realized. Furthermore, when the exhaust temperature of the compressor is greater than or equal to the first exhaust threshold and less than the second exhaust threshold, the heat supply amount is medium, the first refrigerant pipeline is controlled to be conducted, and besides, one of the second energy storage device and the second refrigerant pipeline can be conducted alternatively, so that the heat supply amount is fully utilized.
In one possible design, the processor executes a computer program to control the on/off of the second energy storage device, the first refrigerant pipeline and the second refrigerant pipeline according to the exhaust temperature of the compressor, and further includes: recording a temperature interval which is greater than or equal to the first exhaust threshold and smaller than the third exhaust threshold as a first transition interval, and recording a temperature interval which is greater than or equal to the third exhaust threshold and smaller than the second exhaust threshold as a second transition interval; determining that the exhaust temperature is increased to a first transition region or the exhaust temperature is reduced to a second transition region, and controlling a second energy storage device, a first refrigerant pipeline and a second refrigerant pipeline to keep the current on-off state; and determining that the exhaust temperature is increased to a second transition region or the exhaust temperature is reduced to a first transition region, controlling the second energy storage device to be communicated with the first refrigerant pipeline, and controlling the second refrigerant pipeline to be disconnected.
In the design, how to control the on-off of the second energy storage device, the first refrigerant pipeline and the second refrigerant pipeline according to the exhaust temperature of the compressor when the exhaust temperature of the compressor is greater than or equal to a first exhaust threshold and less than a second exhaust threshold is further limited. The temperature interval is first divided into a first lower transition interval and a second higher transition interval. When the exhaust temperature rises from a value smaller than a first exhaust threshold to a first transition section, the exhaust temperature may rise temporarily and is not stable, the first transition section can be used as a buffer section in the exhaust temperature rising process, the first refrigerant pipeline is still kept connected, the second energy storage device and the second refrigerant pipeline are still disconnected, the heat supply is considered to be in a stable intermediate state when the exhaust temperature continues to rise to the second transition section, and one of the second energy storage device and the second refrigerant pipeline is connected on the basis of connecting the first refrigerant pipeline, so that the heat supply is fully utilized, specifically, the second energy storage device is connected, and the function of defrosting and heating water of the system can be preferentially ensured. On the contrary, when the exhaust temperature is reduced to the second transition section from the second exhaust threshold value or more, the exhaust temperature may be temporarily reduced, the second refrigerant pipeline does not need to be immediately disconnected, the second transition section is used as a buffer section in the exhaust temperature reduction process, the second energy storage device, the first refrigerant pipeline and the second refrigerant pipeline are still kept connected, and when the exhaust temperature is continuously reduced to the first transition section, the second refrigerant pipeline is disconnected, so that the heat supply amount is reasonably utilized.
In one possible design, the heat pump water heater system further comprises: the electromagnetic heating module (IH module, inductive heating, direct heating) is disposed between the exhaust port and the first refrigerant pipeline, and/or the electromagnetic heating module is disposed between the exhaust port and the second refrigerant pipeline, and/or the electromagnetic heating module is disposed on the first water inlet pipeline, and/or the electromagnetic heating module is disposed on the second water inlet pipeline.
In the design, the heat pump water heater system also comprises an electromagnetic heating module which can supply heat by means of electric power, so that the electromagnetic heating module is matched with the first energy storage device, and when the heat storage capacity of the first energy storage device is insufficient, a better quick heating effect is provided for the system. The electromagnetic heating module may be disposed between the exhaust port and the first refrigerant pipeline and/or between the exhaust port and the second refrigerant pipeline to heat the refrigerant flowing into the first refrigerant pipeline and/or the second refrigerant pipeline, or disposed on the first water inlet pipeline and/or the second water inlet pipeline to directly heat the water flow. It is understood that the number of the electromagnetic heating modules may be at least one, that is, at least one of the four positions may be arbitrarily selected, and at least one electromagnetic heating module may be provided at each of the selected positions, depending on the scheme of the positions to be provided.
In one possible design, the processor is further configured to execute the computer program to implement: determining that the water temperature is smaller than a third water outlet threshold value, and controlling the electromagnetic heating module to be started; and determining that the water temperature is greater than or equal to a fourth water outlet threshold value, and controlling the electromagnetic heating module to be closed, wherein the fourth water outlet threshold value is greater than or equal to a third water outlet threshold value.
In this design, it is specifically defined how the processor controls the opening and closing of the electromagnetic heating module. Since the electromagnetic heating module functions similarly to the first energy storage means, a similar control scheme can also be used. When the water outlet temperature is lower than a third water outlet threshold value, the water temperature is considered to be too low, the heating amount is insufficient, additional heat can be provided by controlling the electromagnetic heating module to be started, and the quick heating effect is improved; when the water outlet temperature is larger than or equal to the fourth water outlet threshold value, the water temperature is considered to be high, the water enters a stable heating state, or the heating requirement can be met only by means of the first energy storage device, at the moment, the electromagnetic heating module is controlled to be closed, extra heat provided by the electromagnetic heating module can be omitted, and electric energy consumption is reduced. Further, when the fourth water outlet threshold is greater than the third water outlet threshold, there is an intermediate temperature interval that is greater than or equal to the third water outlet threshold and less than the fourth water outlet threshold, and at this time, the electromagnetic heating module may be controlled to be turned on, and the electromagnetic heating module may also be controlled to be turned off, which is not limited herein.
In one possible design, the fourth water exit threshold is greater than the third water exit threshold, the processor being further configured to execute the computer program to: and determining that the water temperature is greater than or equal to a third water outlet threshold and less than a fourth water outlet threshold, and controlling the electromagnetic heating module to keep the current opening and closing state.
In the design, how to control the opening and closing of the electromagnetic heating module according to the outlet water temperature when the fourth outlet water threshold is larger than the third outlet water threshold is further limited. The water outlet temperature which is more than or equal to the third water outlet threshold and less than the fourth water outlet threshold is not too low but not high enough, the heating is considered to be in an unstable state at the moment, the current opening and closing state is kept by controlling the electromagnetic heating module, the temperature interval which is more than or equal to the third water outlet threshold and less than the fourth water outlet threshold can be used as a buffer interval, the electromagnetic heating module is prevented from being opened and closed frequently, and the stable operation of the system is ensured.
Additional aspects and advantages in accordance with the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 shows a schematic structural diagram of a heat pump water heater system according to a first embodiment of the invention;
fig. 2 shows a schematic control logic diagram of the first valve body and the second valve body of the first embodiment of the invention;
fig. 3 shows a schematic structural diagram of a heat pump water heater system according to a second embodiment of the invention;
fig. 4 is a schematic diagram illustrating on-off control logic of the second energy storage device, the first refrigerant pipeline, and the second refrigerant pipeline according to a second embodiment of the present invention;
fig. 5 shows a schematic structural diagram of a heat pump water heater system according to a third embodiment of the invention;
FIG. 6 shows a schematic control logic diagram of an electromagnetic heating module of a third embodiment of the present invention;
fig. 7 shows a schematic structural diagram of a heat pump water heater system according to a fourth embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the component names in fig. 1, fig. 3, fig. 5 and fig. 7 is:
100 compressor, 102 air inlet, 104 air outlet, 200 first heat exchanger, 300 second heat exchanger, 302 first refrigerant pipeline, 304 first water inlet pipeline, 400 first energy storage device, 402 second refrigerant pipeline, 404 second water inlet pipeline, 406 second valve body, 502 gas-liquid separator, 504 low-pressure tank, 600 water outlet pipeline, 602 first valve body, 700 four-way valve, 800 second energy storage device and 900 electromagnetic heating module.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
A heat pump water heater system provided according to some embodiments of the present invention is described below with reference to fig. 1-7.
Example one
As shown in fig. 1, a heat pump water heater system according to a first embodiment of the present invention includes a compressor 100, a throttling component, a first heat exchanger 200, a second heat exchanger 300, and a first energy storage device 400. The compressor 100 is provided with an air inlet 102 and an air outlet 104, the air inlet 102 is provided with an air inlet temperature sensor Th and a low-pressure switch K1, the air inlet 102 is also connected with a gas-liquid separator 502 and a low-pressure tank 504, and the air outlet 104 is provided with an air outlet temperature sensor Tp, a high-pressure switch K2 and a high-pressure sensor P; the throttling component can be an electronic Expansion valve EXV (electronic Expansion valve) as shown in FIG. 1, and can also be a capillary tube; the first heat exchanger 200 is connected between the air inlet 102 and the electronic expansion valve EXV, the first heat exchanger 200 may be a fin heat exchanger and is provided with a heat exchange temperature sensor T3 to detect a surface temperature thereof, the first heat exchanger 200 may be disposed outdoors to utilize outdoor heat, and an outdoor temperature sensor T4 may be correspondingly provided to detect an outdoor ambient temperature; the second heat exchanger 300 is used for heating water, and is provided with a first refrigerant pipeline 302 and a first water inlet pipeline 304, wherein the first refrigerant pipeline 302 is connected between the exhaust port 104 and the electronic expansion valve EXV; the first energy storage device 400 is provided with a second water inlet pipe 404, the second water inlet pipe 404 is connected in series to the water outlet end of the first water inlet pipe 304, the first energy storage device 400 may be, for example, a phase change energy storage device filled with a phase change material to store heat, water flowing through the second water inlet pipe 404 may absorb heat in the phase change material to realize heating water, the number of the first energy storage devices 400 may be at least one, and when the number of the first energy storage devices 400 is plural, the second water inlet pipes 404 in the plural first energy storage devices 400 may be connected in series in sequence to realize heating for plural times.
The heat pump water heater system provided by the embodiment of the invention is a direct-heating heat pump water heater system, and is characterized in that a compressor 100, a second heat exchanger 300, an electronic expansion valve EXV and a first heat exchanger 200 are sequentially connected into a refrigerant circulating system, the second heat exchanger 300 is provided with a first refrigerant pipeline 302 for passing a refrigerant and a first water inlet pipeline 304 for passing water to be heated (such as municipal water), high-temperature refrigerant discharged from the compressor 100 is subjected to heat release and condensation in the first refrigerant pipeline 302, and heat can be transferred to water flow in the first water inlet pipeline 304, so that the water is directly heated. The heat pump water heater system further comprises a first energy storage device 400 which can store heat and is provided with a second water inlet pipeline 404, wherein the second water inlet pipeline 404 is connected with the first water inlet pipeline 304 in series, so that water flowing out of the first water inlet pipeline 304 can be continuously heated in the second water inlet pipeline 404, and the heating effect is fully ensured. By combining the second heat exchanger 300 and the first energy storage device 400, the heat pump water heater system provided by the embodiment of the invention can realize twice heating of water flow, so that the quick heating effect is improved, and a water tank attached to a traditional heat pump water heater can be eliminated, so that the energy consumption is saved, the development cost is reduced, the floor area of the heat pump water heater system is reduced, and the bacterial growth is reduced.
Further, the first energy storage device 400 is provided with a second refrigerant pipeline 402, the second refrigerant pipeline 402 is connected in parallel with the first refrigerant pipeline 302, that is, the high-temperature refrigerant discharged by the compressor 100 can also flow through the second refrigerant pipeline 402 to transfer heat to the first energy storage device 400, specifically, the heat is transferred to the phase change material filled in the first energy storage device 400, and at this time, the high-temperature exhaust gas of the compressor 100 can be used for supplying heat to the first energy storage device 400, so that the first energy storage device 400 is ensured to have a stable heat source, an additional heat storage heat source does not need to be arranged, the water heating can be directly completed by using the exhaust gas of the compressor 100, and the structure of the heat pump water heater system. Specifically, when the number of the first energy storage devices 400 is multiple, the second refrigerant pipes 402 in the multiple first energy storage devices 400 may be connected in parallel to utilize the high-temperature exhaust gas of the compressor 100 as the heat source of the first energy storage device 400.
Further, the heat pump water heater system further comprises a memory (not shown in the figures) configured to store a computer program and a processor (not shown in the figures); the processor is configured to execute the computer program to implement: the on-off of the first refrigerant pipeline 302 and the second refrigerant pipeline 402 is controlled, so that whether the second heat exchanger 300 is used for heating water and whether heat is supplemented to the first energy storage device 400 can be selected, and the flexible control of the heat pump water heater system is realized. Specifically, when the on/off of the first refrigerant pipeline 302 and the second refrigerant pipeline 402 is controlled, how to control the operation can be determined according to the discharge temperature of the compressor 100, that is, from the perspective of the heating capacity of the compressor 100, or according to the discharge water temperature and the temperature of the first energy storage device 400, that is, from the perspective of the heat demand for heating water and storing energy.
Further, the heat pump water heater system further includes an outlet pipe 600 connected in parallel with the second inlet pipe 404, different water flow paths can be realized by selecting one of the outlet pipe 600 and the second inlet pipe 404 to be connected, and different heating schemes can be adopted to meet different heating requirements. Specifically, when the water outlet circuit 600 is turned on, water enters from the first water inlet circuit 304 and then flows out from the water outlet circuit 600 without flowing through the second water inlet circuit 404, so that the water is heated only by the second heat exchanger 300; when the second water inlet pipeline 404 is connected, water enters from the first water inlet pipeline 304, and then continuously flows into the second water inlet pipeline 404 and flows out, but does not flow out from the water outlet pipeline 600, so that the water can be heated by the second heat exchanger 300 and the first energy storage device 400 in sequence.
Furthermore, a first valve body 602 is disposed on the water outlet pipe 600, a second valve body 406 is disposed on the second water inlet pipe 404, and the first valve body 602 and the second valve body 406 may be, for example, electric ball valves; the processor is further configured to execute the computer program to implement: the first valve body 602 and the second valve body 406 are controlled to open and close according to the outlet water temperature, so that the outlet water pipeline 600 and the second inlet water pipeline 404 are switched on and off, and different water flow paths are realized. By configuring the processor to control the opening and closing of the first valve body 602 and the second valve body 406 according to the outlet water temperature, it can be determined from the outlet water temperature whether the current heating amount is sufficient, and thus a reasonable water flow path.
Specifically, a water outlet threshold value can be configured to control the opening and closing of the first valve body 602 and the second valve body 406 in combination with the water outlet temperature. When the outlet water temperature is still low and the heating amount is insufficient, the first valve body 602 is controlled to be closed and the second valve body 406 is controlled to be opened, so that the water can sequentially flow through the first water inlet pipeline 304 and the second water inlet pipeline 404, that is, the second heat exchanger 300 and the first energy storage device 400 are used for realizing two times of heating, and the quick heating function is realized; when the outlet water temperature is high enough to enter a stable heating state, the first valve body 602 is controlled to open and the second valve body 406 is controlled to close, so that the water only flows through the first water inlet pipeline 304, the second heat exchanger 300 is utilized to realize heating, and the heat stored in the first energy storage device 400 is not utilized. Specifically, the water outlet threshold may be a fixed value set according to the water demand, or a set temperature may be set by a user as an ideal water outlet temperature, and a reasonable water outlet threshold is configured in combination with the set temperature, that is, the water outlet threshold is a variation value associated with the set temperature.
For example, in a first aspect, a processor may be configured to execute a computer program to implement: determining that the water temperature is smaller than the water outlet threshold value, controlling the first valve body 602 to be closed, and controlling the second valve body 406 to be opened; when the water temperature is determined to be larger than or equal to the water outlet threshold value, the first valve body 602 is controlled to be opened, and the second valve body 406 is controlled to be closed.
As another example, in a second approach, a processor may be configured to execute a computer program to implement: determining that the water temperature is smaller than a first water outlet threshold value, controlling the first valve body 602 to be closed, and controlling the second valve body 406 to be opened; determining that the water temperature is greater than or equal to a second water outlet threshold value, controlling the first valve body 602 to be opened, and controlling the second valve body 406 to be closed; when the water temperature is determined to be greater than or equal to the first water outlet threshold and less than the second water outlet threshold, the first valve body 602 and the second valve body 406 are controlled to keep the current open-close state. Wherein the second water outlet threshold is greater than the first water outlet threshold. Through setting a smaller first water outlet threshold value and a larger second water outlet threshold value, a temperature interval which is greater than or equal to the first water outlet threshold value and smaller than the second water outlet threshold value can be used as a buffer interval, the heating is considered to be in an unstable state at the moment, and the first valve body 602 and the second valve body 406 are controlled to keep the current opening and closing state, so that frequent adjustment of the first valve body 602 and the second valve body 406 is avoided, and stable operation of the system is ensured.
For the second solution, it can be understood that the control logic adopted when the outlet water temperature rises and falls is different, and is respectively referred to as the on logic and the off logic. As shown in fig. 2, if T0 is the first water outlet threshold and T0+ a is the second water outlet threshold, the start logic is:
when the outlet water temperature is less than T0, the first valve body 602 is closed, and the second valve body 406 is opened;
when the water outlet temperature is more than T0 and less than T0+ A, the first valve body 602 is closed, and the second valve body 406 is opened;
when the outlet water temperature is greater than T0+ a, the first valve body 602 is opened and the second valve body 406 is closed.
The closing logic is as follows:
when the outlet water temperature is greater than T0+ A, the first valve body 602 is opened, and the second valve body 406 is closed;
when the water outlet temperature is more than T0 and less than T0+ A, the first valve body 602 is opened, and the second valve body 406 is closed;
when the outlet water temperature is less than T0, the first valve body 602 is closed and the second valve body 406 is opened.
Further, for the turn-on logic, the processor may be further configured to execute the computer program to: and determining that the water temperature is always greater than or equal to the second water outlet threshold value in the preset time length, controlling the first valve body 602 to be opened, and controlling the second valve body 406 to be closed. At the moment, the misjudgment and improper control caused by temporary rising of the outlet water temperature can be avoided, and the stable and sufficient temperature outlet water is ensured. The preset time period is related to the performance of the compressor 100 and the water outlet requirement, and can be obtained through theoretical analysis and experiment, and can be set to 2 minutes to 3 minutes, for example.
It can be understood that when the heat pump water heater system is started, the outlet water temperature is often low, and the above opening logic is adopted to control the first valve body 602 to be closed and the second valve body 406 to be opened. The flow direction of the water is shown by the solid arrows in the hollow center of fig. 1: after the water to be heated is heated once by the second heat exchanger 300, the water flows to the first energy storage device 400 and the phase change material to complete the second heating, so that the quick heating function of the air energy water heater in the starting process is realized. When the outlet water temperature rises to some extent and the system is not stabilized yet, the first valve body 602 is kept closed and the second valve body 406 is opened. When the outlet water temperature is high enough, the system operates stably, the first valve body 602 is controlled to be opened, the second valve body 406 is controlled to be closed, the flow direction of water is shown by a hollow dotted arrow in fig. 1, the water to be heated flows out through the first valve body 602 after being heated by the second heat exchanger 300, and domestic water can be provided for users.
In addition, the discharge temperature of the compressor 100 is often low during start-up, and the flow of the refrigerant is shown by solid arrows in fig. 1: the low-temperature and low-pressure gaseous refrigerant is changed into a high-temperature and high-pressure state by the compressor 100; the high-temperature and high-pressure refrigerant is cooled only by the second heat exchanger 300. The refrigerant after heat exchange is decompressed by an electronic expansion valve EXV, evaporated in the first heat exchanger 200, subjected to gas-liquid separation by a low-pressure tank 504 and a gas-liquid separator 502, and returned to the compressor 100. In steady operation, the discharge temperature of the compressor 100 is high enough, and the flow direction of the refrigerant is shown by the solid dashed arrow in fig. 1: the low-temperature and low-pressure gaseous refrigerant is changed into a high-temperature and high-pressure state by the compressor 100; the high-temperature and high-pressure refrigerant passes through the first heat storage device and the second heat exchanger 300 to cool the refrigerant medium, wherein the first heat storage device is mainly used for recovering waste heat generated during the operation of the system and providing a heat source for the initial start. The low-temperature refrigerant is decompressed by an electronic expansion valve EXV, evaporated by the first heat exchanger 200, subjected to gas-liquid separation by the low-pressure tank 504 and the gas-liquid separator 502, and returned to the compressor 100 for complete heating cycle.
Example two
As shown in fig. 3, a heat pump water heater system according to a second embodiment of the present invention is additionally provided with a four-way valve 700 and a second energy storage device 800 on the basis of the first embodiment. A first end s of the four-way valve 700 is connected with the air inlet 102, a second end d of the four-way valve 700 is connected with the exhaust port 104, a third end c of the four-way valve 700 is connected with one end of the first heat exchanger 200 far away from the electronic expansion valve EXV, and a fourth end e of the four-way valve 700 is connected with one end of the first refrigerant pipeline 302 far away from the electronic expansion valve EXV; the second energy storage device 800 is connected in parallel to the first refrigerant pipe 302, and similar to the first energy storage device 400, the second energy storage device 800 may also be a phase change energy storage device filled with a phase change material, and the number of the second energy storage devices 800 may also be at least one, and when the number of the second energy storage devices is multiple, the multiple second energy storage devices 800 are all connected in parallel to the first refrigerant pipe 302.
In the heat pump water heater system provided by the second embodiment of the invention, the four-way valve 700 and the second energy storage device 800 are additionally arranged in the heat pump water heater system provided by the first embodiment, so that the circulation direction of a refrigerant can be conveniently and rapidly changed, and different operation modes can be realized. Specifically, the first end s is connected with the third end c, the second end d is connected with the fourth end e, so that the refrigerant can flow in the sequence of the compressor 100, the second heat exchanger 300, the electronic expansion valve EXV, the first heat exchanger 200 and the compressor 100, the refrigerant is condensed and released heat in the second heat exchanger 300, and water is heated; the first end s is connected with the fourth end e, the second end d is connected with the third end c, as shown by a solid two-dot chain line arrow in fig. 3, a refrigerant flows in the sequence of the compressor 100, the first heat exchanger 200, the electronic expansion valve EXV, the second energy storage device 800 and the compressor 100, the refrigerant is condensed and released in the first heat exchanger 200 to realize defrosting of the first heat exchanger 200, the second energy storage device 800 is used for replacing the second heat exchanger 300, so that the refrigerant can absorb heat and evaporate in the second energy storage device 800, a heat source is provided for a defrosting process, system energy consumption is reduced, circulation reliability is guaranteed, heat of water flow is not absorbed, the first energy storage device 400 can be used for heating water at the moment, and a function of making hot water during defrosting is realized.
Further, the processor is further configured to execute the computer program to implement: controlling the conduction mode of the four-way valve 700 to switch the heat pump water heater system between a pure heating mode and a defrosting heating mode; in the defrosting and heating mode, the second energy storage device 800 is controlled to be connected, and the first refrigerant pipeline 302 and the second refrigerant pipeline 402 are controlled to be disconnected; in the pure heating mode, the second energy storage device 800, the first refrigerant pipeline 302 and the second refrigerant pipeline 402 are controlled to be on or off according to the exhaust temperature of the compressor 100.
Specifically, when the first end s of the four-way valve 700 is connected to the third end c and the second end d is connected to the fourth end e, the system is in a pure heating mode, and at this time, by controlling the on/off of the second energy storage device 800, the first refrigerant pipeline 302 and the second refrigerant pipeline 402 according to the exhaust temperature of the compressor 100, how to distribute the exhaust heat can be reasonably selected according to the heating capacity of the compressor 100.
When the first end s is connected with the fourth end e and the second end d is connected with the third end c, the system is in a defrosting and heating mode, at the moment, the second energy storage device 800 is controlled to be switched on, the first refrigerant pipeline 302 and the second refrigerant pipeline 402 are controlled to be switched off, heat can be released by using the second energy storage device 800 to replace the first refrigerant pipeline 302 and the second refrigerant pipeline 402, and heat loss of the first refrigerant pipeline 302 and the second refrigerant pipeline 402 is avoided. The flow direction of the refrigerant at this time is shown by the solid two-dot chain line arrow in fig. 3: the low-temperature and low-pressure gaseous refrigerant is changed into a high-temperature and high-pressure state by the compressor 100; after the high-temperature and high-pressure refrigerant is cooled by the first heat exchanger 200 and is depressurized by the electronic expansion valve EXV, the high-temperature and high-pressure refrigerant is evaporated into a low-temperature and low-pressure gaseous refrigerant by the second energy storage device 800, and at this time, the heat in the second energy storage device 800 is the waste heat recovered by the phase change material when the system normally operates. The refrigerant then passes through the low pressure tank 504 and the gas-liquid separator 502 to complete gas-liquid separation and then returns to the compressor 100. It can be understood that, in the defrosting heating mode, since the first energy storage device 400 is required to heat water, when the water outlet pipeline 600 is provided, the water outlet pipeline 600 is also controlled to be disconnected, the second water inlet pipeline 404 is controlled to be connected, that is, the first valve body 602 is controlled to be closed, and the second valve body 406 is controlled to be opened, where the water flows in the direction shown by the hollow two-dot chain line arrow in fig. 3.
Specifically, an exhaust threshold may be configured, and the exhaust temperature of the compressor 100 is combined to control the on/off of the second energy storage device 800, the first refrigerant pipeline 302 and the second refrigerant pipeline 402. The method comprises the steps of firstly configuring a first exhaust threshold, a third exhaust threshold and a second exhaust threshold which are sequentially increased, recording a temperature interval which is greater than or equal to the first exhaust threshold and smaller than the third exhaust threshold as a first transition interval, and recording a temperature interval which is greater than or equal to the third exhaust threshold and smaller than the second exhaust threshold as a second transition interval. The control scheme specifically comprises the following steps: determining that the exhaust temperature is lower than a first exhaust threshold value, controlling the first refrigerant pipeline 302 to be conducted, and controlling the second energy storage device 800 and the second refrigerant pipeline 402 to be disconnected, wherein the heat supply amount is low at the moment, the heating of water can be preferentially met, and the reliability of heating water is ensured; determining that the exhaust temperature is greater than or equal to a second exhaust threshold value, and controlling the second energy storage device 800, the first refrigerant pipeline 302 and the second refrigerant pipeline 402 to be conducted, wherein the heat supply is sufficient at the moment, and on the premise of meeting the requirement of heating water, the first energy storage device 400 and the second energy storage device 800 can be used for storing waste heat generated in the heating process of the system so as to realize the quick heating function and the defrosting and water heating function at the same time, thereby ensuring that all functions of the heat pump water heater system can be reliably operated; determining that the exhaust temperature rises to a first transition region or the exhaust temperature falls to a second transition region, and controlling the second energy storage device 800, the first refrigerant pipeline 302 and the second refrigerant pipeline 402 to keep the current on-off state, wherein the change of the exhaust temperature may be unstable at the moment, the first transition region can be used as a buffer region in the exhaust temperature rising process, and the second transition region can be used as a buffer region in the exhaust temperature falling process; and determining that the exhaust temperature is increased to a second transition region or the exhaust temperature is reduced to a first transition region, controlling the second energy storage device 800 to be communicated with the first refrigerant pipeline 302, and controlling the second refrigerant pipeline 402 to be disconnected, wherein the heat supply amount is considered to be in a stable intermediate state at the moment, and the second energy storage device 800 can be communicated so as to preferentially ensure that the system can realize the functions of defrosting and heating water simultaneously.
When the control scheme is implemented, it can be understood that the control logic adopted when the exhaust temperature rises and falls is different and is respectively marked as opening logic and closing logic. In addition, a third valve block SV1, a fourth valve block SV2 and a fifth valve block SV3 may be respectively disposed on the second accumulator 800, the first refrigerant pipeline 302 and the second refrigerant pipeline 402, which may be, for example, solenoid valves, and the on/off of the corresponding devices or pipelines may be realized by controlling the on/off of the solenoid valves. As shown in fig. 4, if TP is the first exhaust threshold, TP + B is the third exhaust threshold, and TP + C is the second exhaust threshold, the start logic is:
when the exhaust temperature is less than TP, the fourth valve body SV2 is opened, and the third valve body SV1 and the fifth valve body SV3 are closed;
when TP is less than exhaust temperature and less than TP + B, the fourth valve body SV2 is opened, and the third valve body SV1 and the fifth valve body SV3 are closed;
when TP + B < exhaust temperature < TP + C, the fourth valve body SV2 and the third valve body SV1 are opened, and the fifth valve body SV3 is closed;
when the exhaust temperature is higher than TP + C, the fourth valve body SV2, the third valve body SV1 and the fifth valve body SV3 are all opened.
Closing the logic:
when the exhaust temperature is higher than TP + C, the fourth valve body SV2, the third valve body SV1 and the fifth valve body SV3 are all opened;
when TP + B < exhaust temperature < TP + C, the fourth valve body SV2, the third valve body SV1 and the fifth valve body SV3 are all opened;
when TP is less than exhaust temperature and less than TP + B, the fourth valve body SV2 and the third valve body SV1 are opened, and the fifth valve body SV3 is closed;
when the exhaust gas temperature is less than TP, the fourth valve body SV2 is opened, and the third valve body SV1 and the fifth valve body SV3 are closed.
The direct-heating heat pump water heater system provided by the embodiment II is mainly divided into three operation modes of stable operation, defrosting operation and starting process. The defrost operation is as described above and will not be described further herein.
When starting, the discharge temperature of the compressor 100 is often low, and the above-mentioned opening logic needs to be adopted to control the first refrigerant pipeline 302 to be conducted and the second energy storage device 800 and the second refrigerant pipeline 402 to be disconnected, at this time, the flow direction of the refrigerant is as shown by the solid arrow in fig. 3: the low-temperature and low-pressure gaseous refrigerant is changed into a high-temperature and high-pressure state by the compressor 100; the high-temperature and high-pressure refrigerant is cooled only by the second heat exchanger 300. The refrigerant after heat exchange is decompressed by an electronic expansion valve EXV, evaporated in the first heat exchanger 200, subjected to gas-liquid separation by a low-pressure tank 504 and a gas-liquid separator 502, and then returned to the compressor 100.
In steady operation, the discharge temperature of the compressor 100 is high enough, and the flow direction of the refrigerant is shown by the solid dashed arrows in fig. 3: the low-temperature and low-pressure gaseous refrigerant is changed into a high-temperature and high-pressure state by the compressor 100; the high-temperature and high-pressure refrigerant passes through the second heat storage device, the second heat exchanger 300 and the first heat storage device to realize the cooling of the refrigerant medium, wherein the second heat storage device and the first heat storage device are mainly used for recovering waste heat generated during the operation of the system and providing a heat source for defrosting and initial starting. The low-temperature refrigerant is decompressed by an electronic expansion valve EXV, evaporated by the first heat exchanger 200, subjected to gas-liquid separation by the low-pressure tank 504 and the gas-liquid separator 502, and returned to the compressor 100 for complete heating cycle.
It is conceivable that the control logic for heating water during the starting process and during the steady operation may be the control logic of the first embodiment, and will not be described herein again. Wherein, when starting, the water flow direction is shown by the hollow solid arrow in fig. 3; in steady operation, the water flow is shown by the hollow dashed arrows in FIG. 3.
EXAMPLE III
As shown in fig. 5, a heat pump water heater system according to a third embodiment of the present invention is provided, in which an electromagnetic heating module 900 is additionally provided on the first embodiment, specifically, on an extended pipeline of the second water inlet pipeline 404, that is, on an outlet water trunk pipeline after the second water inlet pipeline 404 and the outlet water pipeline 600 are merged. The electromagnetic heating module 900 may be powered by electricity to provide heat, and may be coupled to the first energy storage device 400 to provide better rapid heating effect for the system when the heat stored in the first energy storage device 400 is insufficient. It can be understood that the heat pump water heater system without the electromagnetic heating module 900 is particularly applicable to the environment south of the Yangtze river, and the heat pump water heater system with the electromagnetic heating module 900 is particularly applicable to the environment north of the Yangtze river or the environment with high requirement for quick heating.
Specifically, since the electromagnetic heating module 900 functions similarly to the first energy storage device 400, a water outlet threshold value can be configured as well, and the opening and closing of the electromagnetic heating module 900 are controlled in combination with the water outlet temperature. When the temperature of the outlet water is still lower and the heating amount is insufficient, additional heat can be provided by controlling the electromagnetic heating module 900 to be started, and the quick heating effect is improved; when the outlet water temperature is high enough to enter a stable heating state or the heating requirement can be met by only the first energy storage device 400, the electromagnetic heating module 900 is controlled to be turned off, so that the extra heat provided by the electromagnetic heating module 900 can be avoided, and the electric energy consumption is reduced. Specifically, the water outlet threshold may be a fixed value set according to the water demand, or a set temperature may be set by a user as an ideal water outlet temperature, and a reasonable water outlet threshold is configured in combination with the set temperature, that is, the water outlet threshold is a variation value associated with the set temperature.
For example, in a first aspect, a processor may be configured to execute a computer program to implement: determining that the water temperature is smaller than a water outlet threshold value, and controlling the electromagnetic heating module 900 to be started; and determining that the water temperature is greater than or equal to the water outlet threshold value, and controlling the electromagnetic heating module 900 to be closed.
As another example, in a second approach, a processor may be configured to execute a computer program to implement: determining that the water temperature is lower than a third water outlet threshold value, and controlling the electromagnetic heating module 900 to be started; determining that the water temperature is greater than or equal to a fourth water outlet threshold value, and controlling the electromagnetic heating module 900 to be closed; and determining that the water temperature is greater than or equal to the third water outlet threshold and less than the fourth water outlet threshold, and controlling the electromagnetic heating module 900 to keep the current opening and closing state. And the fourth water outlet threshold value is greater than or equal to the third water outlet threshold value. By setting a smaller third water outlet threshold and a larger fourth water outlet threshold, a temperature interval which is greater than or equal to the third water outlet threshold and smaller than the fourth water outlet threshold can be used as a buffer interval, the heating is considered to be in an unstable state at the moment, the electromagnetic heating module 900 is controlled to keep the current opening and closing state, frequent adjustment of the first valve body 602 and the second valve body 406 is avoided, and stable operation of the system is ensured. Further, since the electromagnetic heating module 900 consumes electric energy, the first energy storage device 400 may be preferentially used, the electromagnetic heating module 900 is turned on when the heat of the first energy storage device 400 is insufficient to meet the requirement of heating water, and the electromagnetic heating module 900 is turned off when the heat of the first energy storage device 400 is sufficient to meet the requirement of heating water, so that the third water outlet threshold may be smaller than the first water outlet threshold, and the fourth water outlet threshold may be smaller than the second water outlet threshold.
For the second solution, it can be understood that the control logic adopted when the outlet water temperature rises and falls is different, and is respectively referred to as the on logic and the off logic. As shown in fig. 6, if T1 is the third water outlet threshold and T1+ D is the fourth water outlet threshold, the start logic is:
when the water outlet temperature is less than T1, the electromagnetic heating module 900 is started;
when the water outlet temperature is more than T1 and less than T1+ D, the electromagnetic heating module 900 is started;
when the outlet water temperature is greater than T1+ D, the electromagnetic heating module 900 is turned off.
The closing logic is as follows:
when the outlet water temperature is greater than T1+ D, the electromagnetic heating module 900 is turned off;
when the water outlet temperature is more than T1 and less than T1+ D, the electromagnetic heating module 900 is closed;
when the effluent temperature is < T1, the electromagnetic heating module 900 is turned on.
In addition, it is conceivable that the control logic related to the flow paths of the heating water and the refrigerant may adopt the control logic in the first embodiment, and the description thereof is omitted. During starting, the flow direction of the refrigerant is shown by solid arrows in fig. 5, and the flow direction of the water is shown by hollow solid arrows in fig. 5; in steady operation, the flow of refrigerant is shown by the solid dashed arrows in fig. 5, and the flow of water is shown by the hollow dashed arrows in fig. 5.
Example four
As shown in fig. 7, a heat pump water heater system according to a fourth embodiment of the present invention is provided, in which an electromagnetic heating module 900 is additionally provided on the basis of the second embodiment, specifically, the electromagnetic heating module is provided between the fourth end e of the compressor 100 and the first refrigerant pipeline 302, and is further provided on a main line where the first refrigerant pipeline 302 and the second energy storage device 800 are merged, so as to be provided between the air outlet 104 and the first refrigerant pipeline 302 during the pure heating mode. In this embodiment, since the second refrigerant pipe 402 is connected in parallel to the downstream of the first refrigerant pipe 302, the electromagnetic heating module 900 can heat the refrigerants entering the first refrigerant pipe 302 and the second refrigerant pipe 402 at the same time. The control logic of the electromagnetic heating module 900 is the same as that of the embodiment, and is not described herein.
In addition, it is conceivable that, as in the second embodiment, the direct-heating heat pump water heater system provided in the fourth embodiment is also mainly divided into three operation modes, namely, a stable operation mode, a defrosting operation mode, and a start-up process mode. The control logic for the heating water and the cooling medium flow path may adopt the control logic of the second embodiment, and will not be described herein again. During starting, the flow direction of the refrigerant is shown by solid arrows in fig. 7, and the flow direction of the water is shown by hollow solid arrows in fig. 7; during stable operation, the flow direction of the refrigerant is shown by a solid dotted arrow in fig. 7, and the flow direction of the water is shown by a hollow dotted arrow in fig. 7; in the defrosting operation, the flow direction of the refrigerant is indicated by solid two-dot chain line arrows in fig. 7, and the flow direction of the water is indicated by hollow two-dot chain line arrows in fig. 7.
In summary, the embodiment of the present invention provides a direct-heating heat pump water heater system, which eliminates the use of the water tank of the conventional heat pump water heater by adding the first energy storage device 400 and the second energy storage device 800. The second energy storage device 800 uses the excess heat generated during the normal operation of the system in the defrosting process, thereby reducing the energy consumption of the system. The first energy storage device 400 heats the municipal water by the redundant heat generated during the normal operation of the system, and realizes the quick heating function during the starting of the system and the function of heating water during the defrosting of the system. The electromagnetic heating module 900 is added to realize the quick heating function when the system is started for the first time (the first energy storage device 400 has no heat) or when the first energy storage device 400 has insufficient heat. Compared with the traditional gas water heater and solar water heater, the system has the advantages of energy conservation, less environmental influence and the like; compared with the traditional heat pump water heater, the direct-heating heat pump water heater system eliminates the use of a water tank, and saves the development cost and the occupied area. Meanwhile, the first energy storage device 400 and the second energy storage device 800 increase the utilization rate of energy, and solve the problems that the traditional heat pump water heater is slow in heating speed and cannot heat water during defrosting.
In the description of the present specification, the terms "connect", "mount", "fix", and the like are to be understood in a broad sense, for example, "connect" may be a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (15)
1. A heat pump water heater system, comprising:
a compressor provided with an air inlet and an air outlet;
a throttling member;
a first heat exchanger connected between the air inlet and the throttle member;
the second heat exchanger is provided with a first refrigerant pipeline and a first water inlet pipeline, and the first refrigerant pipeline is connected between the exhaust port and the throttling component; and
the first energy storage device is provided with a second water inlet pipeline, and the second water inlet pipeline is connected with the water outlet end of the first water inlet pipeline in series.
2. The heat pump water heater system of claim 1,
the first energy storage device is provided with a second refrigerant pipeline, and the second refrigerant pipeline is connected with the first refrigerant pipeline in parallel.
3. The heat pump water heater system of claim 2, further comprising:
a memory configured to store a computer program;
a processor configured to execute the computer program to implement:
and controlling the on-off of the first refrigerant pipeline and the second refrigerant pipeline.
4. The heat pump water heater system of claim 3, further comprising:
and the water outlet pipeline is connected with the second water inlet pipeline in parallel.
5. The heat pump water heater system according to claim 4,
the water outlet pipeline is provided with a first valve body, and the second water inlet pipeline is provided with a second valve body;
the processor is further configured to execute the computer program to implement:
and controlling the opening and closing of the first valve body and the second valve body according to the outlet water temperature.
6. The heat pump water heater system of claim 5, wherein the processor is further configured to execute the computer program to implement:
determining that the water outlet temperature is lower than a first water outlet threshold value, controlling the first valve body to close, and controlling the second valve body to open;
and determining that the water outlet temperature is greater than or equal to a second water outlet threshold, controlling the first valve body to open, and controlling the second valve body to close, wherein the second water outlet threshold is greater than or equal to the first water outlet threshold.
7. The heat pump water heater system of claim 6, wherein the processor is further configured to execute the computer program to implement:
and determining that the outlet water temperature is always greater than or equal to the second outlet water threshold value within a preset time length, controlling the first valve body to be opened, and controlling the second valve body to be closed.
8. The heat pump water heater system of claim 6, wherein the second water exit threshold is greater than the first water exit threshold, the processor further configured to execute the computer program to:
and determining that the water outlet temperature is greater than or equal to the first water outlet threshold and smaller than the second water outlet threshold, and controlling the first valve body and the second valve body to keep the current opening and closing state.
9. The heat pump water heater system according to any one of claims 3 to 8, further comprising:
a first end of the four-way valve is connected with the air inlet, a second end of the four-way valve is connected with the air outlet, a third end of the four-way valve is connected with one end of the first heat exchanger, which is far away from the throttling component, and a fourth end of the four-way valve is connected with one end of the first refrigerant pipeline, which is far away from the throttling component;
and the second energy storage device is connected with the first refrigerant pipeline in parallel.
10. The heat pump water heater system of claim 9, wherein the processor is further configured to execute the computer program to implement:
controlling the conduction mode of the four-way valve to switch the heat pump water heater system between a pure heating mode and a defrosting heating mode;
under the defrosting and heating mode, the second energy storage device is controlled to be conducted, and the first refrigerant pipeline and the second refrigerant pipeline are controlled to be disconnected;
and under the pure heating mode, controlling the on-off of the second energy storage device, the first refrigerant pipeline and the second refrigerant pipeline according to the exhaust temperature of the compressor.
11. The heat pump water heater system according to claim 10, wherein the processor executing the computer program controls the second energy storage device, the first refrigerant pipeline, and the second refrigerant pipeline to be turned on and off according to the discharge temperature of the compressor, and the control includes:
determining that the exhaust temperature is smaller than a first exhaust threshold value, controlling the first refrigerant pipeline to be conducted, and controlling the second energy storage device and the second refrigerant pipeline to be disconnected;
and determining that the exhaust temperature is greater than or equal to a second exhaust threshold value, and controlling the second energy storage device, the first refrigerant pipeline and the second refrigerant pipeline to be communicated, wherein the second exhaust threshold value is greater than the first exhaust threshold value.
12. The heat-pump water heater system according to claim 11, wherein the processor executes the computer program to control the second energy storage device, the first refrigerant pipeline, and the second refrigerant pipeline to be turned on and off according to the discharge temperature of the compressor, and further comprising:
recording a temperature interval which is greater than or equal to the first exhaust threshold and smaller than a third exhaust threshold as a first transition interval, and recording a temperature interval which is greater than or equal to the third exhaust threshold and smaller than the second exhaust threshold as a second transition interval;
determining that the exhaust temperature is increased to the first transition interval or the exhaust temperature is decreased to the second transition interval, and controlling the second energy storage device, the first refrigerant pipeline and the second refrigerant pipeline to keep the current on-off state;
and determining that the exhaust temperature is increased to the second transition region or the exhaust temperature is reduced to the first transition region, controlling the second energy storage device to be communicated with the first refrigerant pipeline, and controlling the second refrigerant pipeline to be disconnected.
13. The heat pump water heater system according to any one of claims 3 to 8, further comprising:
the electromagnetic heating module is arranged between the exhaust port and the first refrigerant pipeline, and/or the electromagnetic heating module is arranged between the exhaust port and the second refrigerant pipeline, and/or the electromagnetic heating module is arranged on the first water inlet pipeline, and/or the electromagnetic heating module is arranged on the second water inlet pipeline.
14. The heat pump water heater system of claim 13, wherein the processor is further configured to execute the computer program to implement:
determining that the water outlet temperature is smaller than a third water outlet threshold value, and controlling the electromagnetic heating module to be started;
and determining that the water outlet temperature is greater than or equal to a fourth water outlet threshold, and controlling the electromagnetic heating module to be closed, wherein the fourth water outlet threshold is greater than or equal to the third water outlet threshold.
15. The heat pump water heater system of claim 14, wherein the fourth water exit threshold is greater than the third water exit threshold, the processor further configured to execute the computer program to:
and determining that the water outlet temperature is greater than or equal to the third water outlet threshold and smaller than the fourth water outlet threshold, and controlling the electromagnetic heating module to keep the current opening and closing state.
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Cited By (1)
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