CN111043760B - Phase-change energy-storage type hot water system and control method thereof - Google Patents
Phase-change energy-storage type hot water system and control method thereof Download PDFInfo
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- CN111043760B CN111043760B CN201911296524.9A CN201911296524A CN111043760B CN 111043760 B CN111043760 B CN 111043760B CN 201911296524 A CN201911296524 A CN 201911296524A CN 111043760 B CN111043760 B CN 111043760B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 124
- 238000004146 energy storage Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000006835 compression Effects 0.000 claims abstract description 50
- 238000007906 compression Methods 0.000 claims abstract description 50
- 239000003507 refrigerant Substances 0.000 claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 230000008859 change Effects 0.000 claims description 18
- 230000000149 penetrating effect Effects 0.000 claims description 14
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 8
- 239000012782 phase change material Substances 0.000 description 6
- 239000011232 storage material Substances 0.000 description 6
- 238000005338 heat storage Methods 0.000 description 5
- 230000009977 dual effect Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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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
- F24H7/00—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release
- F24H7/02—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid
-
- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- 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 phase-change energy storage type hot water system and a control method thereof. The phase-change energy-storage type water heating system comprises a refrigerant compression device with a first compression part, a first four-way valve, a first water side heat exchanger, a first electronic expansion valve, a first stop valve, a second electronic expansion valve and a third heat exchanger which are sequentially connected through pipelines, and further comprises a phase-change energy storage device, wherein the phase-change energy storage device is internally provided with a phase-change heat exchanger, each opening on the first four-way valve is respectively communicated with an exhaust opening and an air suction opening of the first compression part, the first water side heat exchanger and the phase-change heat exchanger, and the other end of the phase-change heat exchanger is connected between the first stop valve and the second electronic expansion valve. According to the phase-change energy-storage type water heating system and the control method thereof, the phase-change energy-storage device and the water heat exchanger are separated, so that the water safety of the system can be improved while the advantage of high energy storage density of phase-change energy storage is utilized, and the heat exchange efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of phase-change heat storage, and particularly relates to a phase-change energy storage type hot water system and a control method thereof.
Background
The air source heat pump water heater is widely popularized and applied due to the characteristics of energy conservation, environmental protection, safety and the like, but the water tank is larger due to smaller heat storage density caused by the fact that the water storage tank of the conventional air source heat pump water heater utilizes the sensible heat of water to store heat, so that the air source heat pump water heater is restricted from being further popularized and used. In order to solve the above-mentioned shortcomings, research and development personnel have carried out necessary improvement on the basis of the traditional air source heat pump system, for example, the phase change energy storage technology is applied to the air source heat pump water heater, and can utilize the latent heat of the phase change material to store and release heat, and because the heat storage material has high heat storage density and relatively stable phase change temperature, the phase change heat storage water heater has the advantages of high energy storage density, relatively small volume and relatively stable heat release temperature. In particular operation, in the prior art, a corresponding phase-change energy storage tank is arranged on the basis of an air source heat pump hot water system, a refrigerant pipe for circulating a refrigerant of a compressor and a water pipe for circulating cold and hot water are arranged in the phase-change energy storage tank, and phase-change energy storage materials are filled between the refrigerant pipe and the water pipe, so that the thermal coupling (heat transfer) process between the refrigerant and the phase-change energy storage materials and water is realized.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide a phase-change energy-storage type water heating system and a control method thereof, and the water safety of the system can be improved while utilizing the advantage of high energy storage density of phase-change energy storage and improving heat exchange efficiency by adopting the separated design of the phase-change energy storage device and the water heat exchanger.
In order to solve the above problems, the present invention provides a phase-change energy-storage water heating system, which comprises a refrigerant compression device with a first compression part, a first four-way valve, a first water side heat exchanger, a first electronic expansion valve, a first stop valve, a second electronic expansion valve, and a third heat exchanger which are sequentially connected through pipelines, and further comprises a phase-change energy-storage device, wherein the phase-change energy-storage device is internally provided with a phase-change heat exchanger, the first four-way valve is provided with an Xa port penetrating through an exhaust port of the first compression part, an Xb port penetrating through one end of the first water side heat exchanger, an Xc port penetrating through an air suction port of the first compression part, and an Xd port penetrating through one end of the phase-change heat exchanger, and the other end of the phase-change heat exchanger is connected to a first pipeline between the first stop valve and the second electronic expansion valve.
Preferably, the phase-change energy-storage type water heating system further comprises a second four-way valve, the refrigerant compression device further comprises a second compression part, a second four-way valve, a second water side heat exchanger and a third electronic expansion valve, the second four-way valve is provided with a Ya port communicated with an exhaust port of the second compression part, a Yb port communicated with one end of the second water side heat exchanger, a Yc port communicated with an air suction port of the second compression part and a Yd port communicated with one end of the phase-change heat exchanger, and the other end of the second water side heat exchanger is connected with the first pipeline through the third electronic expansion valve.
Preferably, the first water side heat exchanger has a first water pipe outlet and the second water side heat exchanger has a second water pipe inlet, and the first water pipe outlet is connected with the second water pipe inlet in a penetrating manner.
Preferably, the air suction port of the first compression part is connected with the air suction port of the second compression part through a second stop valve, and/or a third stop valve is arranged on a pipeline between the Yb port and one end of the second water side heat exchanger, and/or a fourth stop valve is arranged on a pipeline between the Yd port and one end of the phase change heat exchanger.
Preferably, a fifth stop valve is arranged on a pipeline between the Xd port and the one end of the phase-change heat exchanger.
Preferably, a second pipeline is arranged between the first electronic expansion valve and the first stop valve, a third pipeline is arranged between the second electronic expansion valve and the third heat exchanger, and the system further comprises a fourth pipeline, a sixth stop valve is arranged on the fourth pipeline, and the fourth pipeline is arranged between the second pipeline and the third pipeline.
Preferably, the heat exchange tube flow path of the phase change heat exchanger is arranged in the phase change energy storage device in a Z shape or an i shape.
The invention also provides a control method for the phase-change energy storage type water heating system, which comprises the following steps:
acquiring an operation mode;
and controlling the on-off of a cut-off valve and/or an electronic expansion valve in the system and the on-off flow path switching of the four-way valve according to the acquired operation mode, so that the system operates in the acquired operation mode.
Preferably, when the operation mode is a small-load single-heat-source heating mode, the fifth stop valve and the second electronic expansion valve are controlled to be conducted, the Xa port and the Xd port of the first four-way valve and the Xb port and the Xc port of the first four-way valve are controlled to be respectively conducted, and the first stop valve, the second stop valve, the third stop valve, the fourth stop valve, the sixth stop valve, the first electronic expansion valve and the third electronic expansion valve are controlled to be cut off; or,
when the operation mode is a large-load single-heat-source heating mode, the fifth stop valve, the second electronic expansion valve, the second stop valve and the fourth stop valve are controlled to be switched on, the Xa port and the Xd port and the Xb port and the Xc port of the first four-way valve are controlled to be respectively switched on, the Ya port and the Yd port and the Yb port and the Yc port of the second four-way valve are controlled to be respectively switched on, and the first stop valve, the third stop valve, the sixth stop valve, the first electronic expansion valve and the third electronic expansion valve are controlled to be switched off.
Preferably, when the operation mode is a small-load single-heat-source heat release mode, the first electronic expansion valve, the first stop valve and the fifth stop valve are controlled to be switched on, the Xa port and the Xb port of the first four-way valve and the Xd port and the Xc port of the first four-way valve are controlled to be respectively switched on, and the second electronic expansion valve, the second stop valve, the third stop valve, the fourth stop valve, the sixth stop valve and the third electronic expansion valve are controlled to be switched off; or,
when the operation mode is a large-load single-heat-source heat release mode, the first electronic expansion valve, the first stop valve, the fifth stop valve, the fourth stop valve and the third electronic expansion valve are controlled to be conducted, the Xa port and the Xb port and the Xd port and the Xc port of the first four-way valve are controlled to be respectively conducted, the Ya port and the Yb port and the Yd port and the Yc port of the second four-way valve are controlled to be respectively conducted, and the second electronic expansion valve, the second stop valve, the third stop valve and the sixth stop valve are controlled to be cut off.
Preferably, when the operation mode is a small-load double-heat-source heating mode, the fifth stop valve, the first electronic expansion valve and the second electronic expansion valve are controlled to be conducted, the Xa port and the Xd port of the first four-way valve and the Xb port and the Xc port of the first four-way valve are controlled to be respectively conducted, and the second stop valve, the third stop valve, the fourth stop valve, the sixth stop valve and the third electronic expansion valve are controlled to be cut off; or,
when the operation mode is a large-load double-heat-source heating mode, the fifth stop valve, the first stop valve, the third stop valve, the fourth stop valve, the first electronic expansion valve, the second electronic expansion valve and the third electronic expansion valve are controlled to be conducted, the Xa port and the Xd port of the first four-way valve and the Xb port and the Xc port of the first four-way valve are controlled to be respectively conducted, and the second stop valve and the sixth stop valve are controlled to be cut off.
Preferably, when the operation mode is a dual-heat-source heat release mode, the third stop valve, the third electronic expansion valve, the second electronic expansion valve, the fourth stop valve, the first electronic expansion valve and the sixth stop valve are controlled to be conducted, the Xa port and the Xb port and the Xd port and the Xc port of the first four-way valve are controlled to be respectively conducted, the Ya port and the Yb port and the Yd port and the Yc port of the second four-way valve are controlled to be respectively conducted, and the second stop valve, the first stop valve and the fifth stop valve are controlled to be cut off.
Preferably, when the operation mode is a single heat pump small-load heating mode, the first electronic expansion valve and the sixth stop valve are controlled to be conducted, the Xa port and the Xb port of the first four-way valve and the Xd port and the Xc port of the first four-way valve are controlled to be respectively conducted, and the second stop valve, the first stop valve, the fifth stop valve, the third electronic expansion valve, the second electronic expansion valve and the fourth stop valve are controlled to be cut off; or,
when the operation mode is a single heat pump large-load heating mode, the first electronic expansion valve, the sixth stop valve, the second stop valve, the third electronic expansion valve and the second electronic expansion valve are controlled to be conducted, the Xa port and the Xb port and the Xd port of the first four-way valve are controlled to be respectively conducted, the Ya port and the Yb port and the Yd port and the Yc port of the second four-way valve are controlled to be respectively conducted, and the first stop valve, the fifth stop valve and the fourth stop valve are controlled to be cut off.
According to the phase-change energy-storage type water heating system and the control method thereof, the first water side heat exchanger and the phase-change energy-storage device are arranged in a mutually independent and separated mode, and the refrigerant pipe, the water pipe and the phase-change energy-storage material are not integrated in one component, so that the water safety of the system can be improved while the advantage of high energy storage density of phase-change energy storage is utilized, and meanwhile, the heat exchange area between the phase-change refrigerant pipe and the phase-change material in the phase-change energy-storage device and the heat exchange area between the refrigerant pipe and the water pipe in the first water side heat exchanger are improved, so that the heat exchange energy efficiency of the system is improved.
Drawings
FIG. 1 is a schematic diagram of a phase-change energy-storage water heating system according to an embodiment of the present invention, wherein black arrows show the flow direction of water in a water pipe;
FIG. 2 is a schematic diagram of the hot water system of FIG. 1 in a high load single heat source charging mode, with black arrows showing the circulating flow direction of the refrigerant;
FIG. 3 is a schematic diagram of the hot water system of FIG. 1 in a high load dual heat source charging mode, with black arrows showing the circulating flow direction of the refrigerant;
FIG. 4 is a schematic diagram of the hot water system of FIG. 1 in a high load single heat source heat release mode, wherein black arrows show the circulating flow direction of the refrigerant;
FIG. 5 is a schematic diagram of the hot water system of FIG. 1 in a dual heat source heat release mode, wherein the black arrows illustrate the circulating flow direction of the refrigerant;
FIG. 6 is a schematic diagram of the hot water system of FIG. 1 in a single heat pump high load heating mode, with black arrows showing the circulating flow direction of the refrigerant;
FIG. 7 is a schematic diagram of an internal structure of the phase change energy storage device of FIG. 1;
fig. 8 is a schematic diagram illustrating another internal structure of the phase change energy storage device in fig. 1.
The reference numerals are expressed as:
10. a third heat exchanger; 111. a first compression section; 112. a first four-way valve; 113. a first water side heat exchanger; 114. a first electronic expansion valve; 115. a first stop valve; 116. a second electronic expansion valve; 20. a phase change energy storage device; 211. a second compression section; 212. a second four-way valve; 213. a second water side heat exchanger; 214. a third electronic expansion valve; 31. a second shut-off valve; 32. a third stop valve; 33. a fourth shut-off valve; 34. and a fifth stop valve.
Detailed Description
Referring to fig. 1 to 8, according to an embodiment of the present invention, there is provided a phase-change energy storage type water heating system including a refrigerant compression device having a first compression unit 111, a first four-way valve 112, a first water side heat exchanger 113, a first electronic expansion valve 114, a first stop valve 115, a second electronic expansion valve 116, and a third heat exchanger 10 connected in sequence by a pipe, and further including a phase-change energy storage device 20, wherein the phase-change energy storage device 20 includes a phase-change heat exchanger, the first four-way valve 112 includes an Xa port penetrating through an exhaust port of the first compression unit 111, an Xc port penetrating one end of the first water side heat exchanger 113, an Xd port penetrating one end of the first compression unit 111, and the other end of the phase-change heat exchanger is connected to a first pipe between the first stop valve 115 and the second electronic expansion valve 116, and the first water side heat exchanger 113 includes a corresponding pipe and a water pipe, so as to realize heat exchange of refrigerant between water and refrigerant in the water pipe. In this technical solution, because the first water side heat exchanger 113 and the phase-change energy storage device 20 are separately disposed relatively to each other, instead of integrating the refrigerant pipe, the water pipe and the phase-change energy storage material into one component, the water safety of the system can be improved while the advantage of high energy storage density of phase-change energy storage is utilized, and simultaneously, the heat exchange area between the phase-change refrigerant pipe and the phase-change material in the phase-change energy storage device 20 and the heat exchange area between the refrigerant pipe and the water pipe in the first water side heat exchanger 113 are improved, thereby improving the heat exchange energy efficiency of the system.
Further, the phase-change energy-storage type water heating system further includes a second four-way valve 212, the refrigerant compression device further includes a second compression portion 211, a second four-way valve 212, a second water-side heat exchanger 213, and a third electronic expansion valve 214, the second four-way valve 212 includes a Ya port penetrating through an exhaust port of the second compression portion 211, a Yb port penetrating through one end of the second water-side heat exchanger 213, a Yc port penetrating through an air suction port of the second compression portion 211, and a Yd port penetrating through one end of the phase-change heat exchanger, and the other end of the second water-side heat exchanger 213 is connected to the first pipeline through the third electronic expansion valve 214. In this technical solution, on the one hand, the second compression portion 211 included in the refrigerant compression device makes the displacement of the refrigerant compression device have a space that can be increased, so that the phase-change energy-storage hot water system is improved in load adaptability, for example, only one compression portion, such as the first compression portion 111, can be operated when the load is small, and two compression portions, such as the first compression portion 111 and the second compression portion 211, that are simultaneously operated and connected in parallel when the load is large, are beneficial to ensuring that the motor driving portion corresponding to the compression portion always operates near the higher motor efficiency, the aforementioned small load and the large load are relatively similar, and the specific load dividing standard is set according to the actual situation; on the other hand, the second water-side heat exchanger 213 is provided to provide the water heating system with the two water temperatures selectable. The refrigerant compression device in this technical solution may be formed by connecting two independent compressors in parallel, that is, the first compression part 111 is one compressor and the second compression part 211 is the other compressor, or the refrigerant compression device may be a double-cylinder compressor with two compression parts, which is a more conventional technology, and the present invention is not limited in particular.
Further, the first water side heat exchanger 113 has a first water pipe outlet, the second water side heat exchanger 213 has a second water pipe inlet, and the first water pipe outlet is connected with the second water pipe inlet in a penetrating manner, that is, the water in the first water pipe is conveyed to the second water side heat exchanger 213 for heat exchange after heat exchange of the refrigerant in the first water side heat exchanger 13, so that the water can be subjected to step heating or refrigerating, and the corresponding heat exchange efficiency is improved. Specifically, for example, by changing the operating frequency of the first compression portion 111 or the second compression portion 211, and further changing the refrigerant displacement and the temperature of the corresponding compression portion, the condensation temperature or the evaporation temperature of the first water side heat exchanger 113 and/or the second water side heat exchanger 213 is adjusted differently, so that the temperature difference between the condensation temperature or the evaporation temperature and the water inlet temperature in the water pipe is reduced, and further the corresponding heat exchange efficiency is improved. The water flow direction in the water pipe in the technical scheme can be the best opposite to the refrigerant in the refrigerant pipe in the corresponding heat exchanger, so that reverse heat exchange is formed, and the heat exchange efficiency is improved.
Further, in order to enable the hot water system to have more operation modes, it is preferable that the air suction port of the first compression part 111 and the air suction port of the second compression part 211 are connected through a second stop valve 31, and/or a third stop valve 32 is arranged on a pipeline between the Yb port and the one end of the second water side heat exchanger 213, and/or a fourth stop valve 33 is arranged on a pipeline between the Yd port and the one end of the phase change heat exchanger, and in specific application, the hot water system can be switched between modes by controlling the on or off states of the stop valves, the on-off flow path of the four-way valve and the on-off of the corresponding electronic expansion valve, so as to meet different use requirements of users. Further, a fifth stop valve 34 is provided on the pipe line between the Xd port and the one end of the phase change heat exchanger.
Preferably, a second pipeline is disposed between the first electronic expansion valve 114 and the first stop valve 115, a third pipeline is disposed between the second electronic expansion valve 116 and the third heat exchanger 10, and a fourth pipeline is further included, and a sixth stop valve 35 is disposed on the fourth pipeline, and the fourth pipeline is disposed between the second pipeline and the third pipeline.
As a specific implementation manner of the phase-change energy storage device, the phase-change energy storage device includes the phase-change heat exchanger and the phase-change energy storage material wrapped outside the phase-change heat exchanger, that is, the phase-change material, it can be understood that the phase-change material is encapsulated in the outer shell, at this time, in order to improve the heat exchange efficiency of the phase-change energy storage device, preferably, the heat exchange tube flow path of the phase-change heat exchanger is in a zigzag shape (as shown in fig. 8) or an i-shaped shape (as shown in fig. 7) in the phase-change energy storage device 20, and no existing U-shaped arrangement is adopted, so that the phenomenon of mutual heat exchange (that is, refrigerant reheating) caused by too short distance between the inlet and the outlet of the U-shaped refrigerant tube is effectively prevented. Furthermore, the heat exchanger for phase change can be realized by adopting a corresponding heat exchanger, and is beneficial to be defined as an energy storage heat exchanger, wherein the energy storage heat exchanger can adopt any one of a common fin tube heat exchanger, a spiral coil heat exchanger and a coiled tube heat exchanger. The phase change temperature range of the phase change material is preferably 40-60 ℃ so as to meet the demands of users.
According to an embodiment of the present invention, there is also provided a control method for the phase-change energy storage type water heating system, including:
acquiring an operation mode;
and controlling the on-off of a cut-off valve and/or an electronic expansion valve in the system and the on-off flow path switching of the four-way valve according to the acquired operation mode, so that the system operates in the acquired operation mode.
Preferably, when the operation mode is a small-load single-heat-source heating mode, the fifth stop valve 34 and the second electronic expansion valve 116 are controlled to be turned on, the Xa port and the Xd port, and the Xb port and the Xc port of the first four-way valve 112 are controlled to be turned on respectively, and the first stop valve 115, the second stop valve 31, the third stop valve 32, the fourth stop valve 33, the sixth stop valve 35, the first electronic expansion valve 114 and the third electronic expansion valve 214 are controlled to be turned off; or,
as shown in fig. 2, when the operation mode is the large-load single-heat-source heat-charging mode, the fifth stop valve 34, the second electronic expansion valve 116, the second stop valve 31, and the fourth stop valve 33 are controlled to be turned on, the Xa port and the Xd port, and the Xb port and the Xc port of the first four-way valve 112 are controlled to be turned on, and the Ya port and the Yd port, and the Yb port and the Yc port of the second four-way valve 212 are controlled to be turned on, respectively, and the first stop valve 115, the third stop valve 32, the sixth stop valve 35, the first electronic expansion valve 114, and the third electronic expansion valve 214 are controlled to be turned off.
Preferably, when the operation mode is a small-load single-heat-source heat release mode, the first electronic expansion valve 114, the first stop valve 115 and the fifth stop valve 34 are controlled to be turned on, the Xa port and the Xb port, the Xd port and the Xc port of the first four-way valve 112 are controlled to be turned on respectively, and the second electronic expansion valve 116, the second stop valve 31, the third stop valve 32, the fourth stop valve 33, the sixth stop valve 35 and the third electronic expansion valve 214 are controlled to be turned off; or,
as shown in fig. 4, when the operation mode is the large-load single-heat-source heat release mode, the first electronic expansion valve 114, the first stop valve 115, the fifth stop valve 34, the fourth stop valve 33, and the third electronic expansion valve 214 are controlled to be turned on, the Xa port and the Xb port, and the Xd port and the Xc port of the first four-way valve 112 are controlled to be turned on, the Ya port and the Yb port, and the Yd port and the Yc port of the second four-way valve 212 are controlled to be turned on, and the second electronic expansion valve 116, the second stop valve 31, the third stop valve 32, and the sixth stop valve 35 are controlled to be turned off, and at this time, water in the water pipe performs heat exchange with the first user side heat exchanger 113 and the second user side heat exchanger 213 in a cascade manner to form hot water.
Preferably, when the operation mode is a small-load dual-heat-source heating mode, the fifth stop valve 34, the first stop valve 115, the first electronic expansion valve 114 and the second electronic expansion valve 116 are controlled to be turned on, the Xa port and the Xd port, the Xb port and the Xc port of the first four-way valve 112 are controlled to be respectively turned on, and the second stop valve 31, the third stop valve 32, the fourth stop valve 33, the sixth stop valve 35 and the third electronic expansion valve 214 are controlled to be turned off; or,
as shown in fig. 3, when the operation mode is the heavy-load dual-heat-source heating mode, the fifth stop valve 34, the first stop valve 115, the third stop valve 32, the fourth stop valve 33, the first electronic expansion valve 114, the second electronic expansion valve 116, and the third electronic expansion valve 214 are controlled to be turned on, the Xa port and the Xd port of the first four-way valve 112, the Xb port and the Xc port are controlled to be turned on, and the second stop valve 31 and the sixth stop valve 35 are controlled to be turned off, and at this time, water in the water pipe, the first user side heat exchanger 113 and the second user side heat exchanger 213 perform heat exchange for a step to form cold water.
As shown in fig. 5, preferably, when the operation mode is the dual heat source heat release mode, the third stop valve 32, the third electronic expansion valve 214, the second electronic expansion valve 116, the fourth stop valve 33, the first electronic expansion valve 114, and the sixth stop valve 35 are controlled to be turned on, the Xa port and the Xb port of the first four-way valve 112, the Xd port and the Xc port are controlled to be turned on, the Ya port and the Yb port and the Yd port of the second four-way valve 212 are controlled to be turned on, and the second stop valve 31, the first stop valve 115, and the fifth stop valve 34 are controlled to be turned off, and at this time, the water in the water pipe performs heat exchange with the first user side heat exchanger 113 and the second user side heat exchanger 213 in a cascade manner to form cold water.
Preferably, when the operation mode is the single heat pump small load heating mode, the first electronic expansion valve 114 and the sixth stop valve 35 are controlled to be turned on, the Xa port and the Xb port of the first four-way valve 112 and the Xd port and the Xc port are controlled to be turned on respectively, and the second stop valve 31, the first stop valve 115, the fifth stop valve 34, the third stop valve 32, the third electronic expansion valve 214, the second electronic expansion valve 116 and the fourth stop valve 33 are controlled to be turned off; or,
as shown in fig. 6, when the operation mode is the single heat pump heavy load heating mode, the first electronic expansion valve 114, the sixth stop valve 35, the second stop valve 31, the third stop valve 32, the third electronic expansion valve 214, and the second electronic expansion valve 116 are controlled to be turned on, the Xa port and the Xb port of the first four-way valve 112, the Xd port and the Xc port are controlled to be turned on, the Ya port and the Yb port and the Yd port of the second four-way valve 212 are controlled to be turned on, and the first stop valve 115, the fifth stop valve 34, and the fourth stop valve 33 are controlled to be turned off, so that a traditional heat pump hot water system is formed, and water in the water pipe, the first user side heat exchanger 113 and the second user side heat exchanger 213 perform heat exchange in a gradient manner, and then form cold water.
It should be clear from the above that the single heat source or the double heat source refers to the number of heat exchangers functioning as evaporators in the hot water system (wherein the first water side heat exchanger and the second water side heat exchanger are used as one evaporator only) being one or two. For example, in fig. 1, the third heat exchanger 10 forms a single heat source as the sole evaporator within the system; the third heat exchanger 10 in fig. 2 is used as an evaporator, the first water side heat exchanger 113 and the second water side heat exchanger 213 are used as an evaporator to form a dual heat source, and the definition in other modes is the same as the logic and will not be repeated.
It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (8)
1. The phase-change energy-storage type water heating system is characterized by comprising a refrigerant compression device with a first compression part (111), a first four-way valve (112), a first water side heat exchanger (113), a first electronic expansion valve (114), a first stop valve (115), a second electronic expansion valve (116) and a third heat exchanger (10) which are sequentially connected through pipelines, and further comprising a phase-change energy storage device (20), wherein the phase-change energy storage device (20) is internally provided with a phase-change heat exchanger, the first four-way valve (112) is provided with an Xa port communicated with an exhaust port of the first compression part (111), an Xb port communicated with one end of the first water side heat exchanger (113), an Xc port communicated with an air suction port of the first compression part (111) and an Xd port communicated with one end of the phase-change heat exchanger, and the other end of the phase-change heat exchanger is connected to a first pipeline between the first stop valve (115) and the second electronic expansion valve (116); the refrigerant compression device further comprises a second four-way valve (212), a second compression part (211), a second four-way valve (212), a second water-side heat exchanger (213) and a third electronic expansion valve (214), wherein the second four-way valve (212) is provided with a Ya port communicated with an exhaust port of the second compression part (211), a Yb port communicated with one end of the second water-side heat exchanger (213), a Yc port communicated with an air suction port of the second compression part (211) and a Yd port communicated with one end of the phase-change heat exchanger, and the other end of the second water-side heat exchanger (213) is connected with the first pipeline through the third electronic expansion valve (214); the first water side heat exchanger (113) is provided with a first water pipe outlet, the second water side heat exchanger (213) is provided with a second water pipe inlet, and the first water pipe outlet is connected with the second water pipe inlet in a penetrating way; a third stop valve (32) is arranged on a pipeline between the Yb port and one end of the second water side heat exchanger (213), and/or a fourth stop valve (33) is arranged on a pipeline between the Yd port and one end of the phase change heat exchanger; a fifth stop valve (34) is arranged on a pipeline between the Xd port and one end of the phase change heat exchanger; the electronic expansion valve comprises a first electronic expansion valve (114) and a first stop valve (115), a second pipeline is arranged between the first electronic expansion valve (114) and the third heat exchanger (10), a third pipeline is arranged between the second electronic expansion valve (116) and the third heat exchanger, the electronic expansion valve further comprises a fourth pipeline, a sixth stop valve (35) is arranged on the fourth pipeline, and the fourth pipeline is arranged between the second pipeline and the third pipeline.
2. The water heating system according to claim 1, wherein the phase change heat exchanger heat exchange tube flow path is arranged in a zigzag or i-shape in the phase change energy storage device (20).
3. A control method for the phase change energy storage type hot water system of claim 1, comprising:
acquiring an operation mode;
and controlling the on-off of a stop valve and/or an electronic expansion valve in the system and the on-off flow path switching of the four-way valve according to the acquired operation mode, so that the system operates in the acquired operation mode.
4. The control method according to claim 3, wherein,
when the operation mode is a small-load single-heat-source heating mode, the fifth stop valve (34) and the second electronic expansion valve (116) are controlled to be conducted, the Xa port and the Xd port of the first four-way valve (112) and the Xb port and the Xc port of the first four-way valve (112) are controlled to be respectively conducted, and the first stop valve (115), the second stop valve (31), the third stop valve (32), the fourth stop valve (33), the sixth stop valve (35), the first electronic expansion valve (114) and the third electronic expansion valve (214) are controlled to be cut off; or,
when the operation mode is a large-load single-heat-source heating mode, the fifth stop valve (34), the second electronic expansion valve (116), the second stop valve (31) and the fourth stop valve (33) are controlled to be conducted, the Xa port and the Xd port, the Xb port and the Xc port of the first four-way valve (112) are controlled to be conducted respectively, the Ya port and the Yd port and the Yb port and the Yc port of the second four-way valve (212) are controlled to be conducted respectively, and the first stop valve (115), the third stop valve (32), the sixth stop valve (35), the first electronic expansion valve (114) and the third electronic expansion valve (214) are controlled to be cut off.
5. The control method according to claim 3, wherein,
when the operation mode is a small-load single-heat-source heat release mode, the first electronic expansion valve (114), the first stop valve (115) and the fifth stop valve (34) are controlled to be switched on, the Xa port and the Xb port of the first four-way valve (112) and the Xd port and the Xc port of the first four-way valve are controlled to be respectively switched on, and the second electronic expansion valve (116), the second stop valve (31), the third stop valve (32), the fourth stop valve (33), the sixth stop valve (35) and the third electronic expansion valve (214) are controlled to be switched off; or,
when the operation mode is a large-load single-heat-source heat release mode, the first electronic expansion valve (114), the first stop valve (115), the fifth stop valve (34), the fourth stop valve (33) and the third electronic expansion valve (214) are controlled to be conducted, the Xa port and the Xb port and the Xd port of the first four-way valve (112) are controlled to be conducted respectively, the Ya port and the Yb port and the Yd port of the second four-way valve (212) are controlled to be conducted respectively, and the second electronic expansion valve (116), the second stop valve (31), the third stop valve (32) and the sixth stop valve (35) are controlled to be cut off.
6. The control method according to claim 3, wherein,
when the operation mode is a small-load double-heat-source heating mode, the fifth stop valve (34), the first stop valve (115), the first electronic expansion valve (114) and the second electronic expansion valve (116) are controlled to be conducted, the Xa port and the Xd port of the first four-way valve (112) and the Xb port and the Xc port of the first four-way valve (112) are controlled to be respectively conducted, and the second stop valve (31), the third stop valve (32), the fourth stop valve (33), the sixth stop valve (35) and the third electronic expansion valve (214) are controlled to be cut off; or,
when the operation mode is a large-load double-heat-source heating mode, the fifth stop valve (34), the first stop valve (115), the third stop valve (32), the fourth stop valve (33), the first electronic expansion valve (114), the second electronic expansion valve (116) and the third electronic expansion valve (214) are controlled to be conducted, the Xa port and the Xd port of the first four-way valve (112) are controlled to be conducted, the Xb port and the Xc port are controlled to be conducted, and the second stop valve (31) and the sixth stop valve (35) are controlled to be cut off.
7. The control method according to claim 3, wherein,
when the operation mode is a dual-heat-source heat release mode, the third stop valve (32), the third electronic expansion valve (214), the second electronic expansion valve (116), the fourth stop valve (33), the first electronic expansion valve (114) and the sixth stop valve (35) are controlled to be conducted, the Xa port and the Xb port of the first four-way valve (112) and the Xd port and the Xc port of the second four-way valve (212) are controlled to be conducted respectively, and the Ya port and the Yb port and the Yd port and the Yc port of the second four-way valve (212) are controlled to be conducted respectively, so that the second stop valve (31), the first stop valve (115) and the fifth stop valve (34) are controlled to be cut off.
8. The control method according to claim 3, wherein,
when the operation mode is a single heat pump small-load heating mode, the first electronic expansion valve (114) and the sixth stop valve (35) are controlled to be conducted, the Xa port and the Xb port of the first four-way valve (112) and the Xd port and the Xc port of the first four-way valve are controlled to be respectively conducted, and the second stop valve (31), the first stop valve (115), the fifth stop valve (34), the third stop valve (32), the third electronic expansion valve (214), the second electronic expansion valve (116) and the fourth stop valve (33) are controlled to be cut off; or,
when the operation mode is the single heat pump large-load heating mode, the first electronic expansion valve (114), the sixth stop valve (35), the second stop valve (31), the third stop valve (32), the third electronic expansion valve (214) and the second electronic expansion valve (116) are controlled to be conducted, the Xa port and the Xb port of the first four-way valve (112) and the Xd port and the Xc port of the second four-way valve (212) are controlled to be conducted respectively, and the Ya port and the Yb port and the Yd port and the Yc port of the second four-way valve (212) are controlled to be conducted respectively, so that the first stop valve (115), the fifth stop valve (34) and the fourth stop valve (33) are controlled to be cut off.
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