Air conditioning and hot water integrated system and control method thereof

Abstract

The present invention discloses an integrated air conditioning and hot water system and a control method thereof, comprising a water circulation loop, a refrigerant circulation loop and a phase change thermal storage unit; a solar collector and a water tank are arranged on the water circulation loop, and the solar collector and the water tank are connected; a compressor and an indoor heat exchanger are arranged on the refrigerant circulation loop, and the compressor and the indoor heat exchanger are connected; two ends of one path of the phase change thermal storage unit are respectively connected to the indoor heat exchanger and the compressor, and the first end of the other path is connected to the pipeline between the outlet of the solar collector and the water tank, and the second end is connected to the pipeline between the inlet of the solar collector and the water tank. The phase change thermal storage technology, solar energy technology and air source heat pump technology are combined. When the solar energy is sufficient, the phase change thermal storage technology is used to store the heat of the solar energy and the condensation heat of the compressor in the phase change thermal storage unit. When the solar energy is insufficient, the heat is extracted from the phase change thermal storage unit for heating and / or hot water, thereby realizing the transfer of heat in time and space.

Description

Technical Field

[0001] The present invention relates to the technical field of integrated air-conditioning and hot water devices, and in particular to an integrated air-conditioning and hot water system and a control method thereof. Background Art

[0002] As people's living standards improve, building energy consumption continues to increase, among which the energy consumption of building heating and domestic hot water has grown particularly fast. Therefore, in order to meet the increasingly tight energy consumption, new requirements have been put forward for energy structure and energy utilization.

[0003] Solar energy is a renewable and clean energy source with many advantages such as unlimited reserves, universal existence, clean utilization and good economy. However, its instability caused by weather and climate also restricts its further development. Air source heat pump is an efficient, energy-saving and environmentally friendly way of energy utilization, but there are still problems such as attenuation of low-temperature heating capacity, frosting and defrosting in winter affecting indoor thermal comfort, and waste of waste heat in outdoor heat exchangers for cooling in summer. Summary of the invention

[0004] In view of this, the present invention provides an integrated air conditioning and hot water system and a control method thereof, which absorbs solar energy and air energy through a phase change heat storage unit and an air source heat pump, thereby realizing the transfer and utilization of heat in time and space.

[0005] In order to solve the above problems, according to one aspect of the present application, an embodiment of the present invention provides an integrated air conditioning and hot water system, the integrated air conditioning and hot water system comprising:

[0006] A water circulation loop, a solar collector and a water tank are arranged on the water circulation loop, and the solar collector and the water tank are connected;

[0007] A refrigerant circulation loop, a compressor and an indoor heat exchanger are arranged on the refrigerant circulation loop, and the compressor and the indoor heat exchanger are connected;

[0008] The phase-change heat storage unit comprises two flow paths, wherein two ends of one path are respectively connected to the indoor heat exchanger and the compressor, and a first end of another path of the phase-change heat storage unit is connected to a pipeline between an outlet of the solar collector and a water tank, and a second end is connected to a pipeline between an inlet of the solar collector and the water tank;

[0009] When the indoor heat exchanger is used as an evaporator, the refrigerant discharged from the compressor enters the phase change heat storage unit and the water tank for heat exchange, and then enters the indoor heat exchanger to absorb heat; when the indoor heat exchanger is used as a condenser, the refrigerant discharged from the compressor enters the indoor heat exchanger and the water tank to release heat, and then enters the phase change heat storage unit for heat exchange.

[0010] In some embodiments, the phase change thermal storage unit includes a first heat exchanger and a phase change thermal storage layer, and the phase change thermal storage layer wraps the first heat exchanger.

[0011] In some embodiments, the phase change thermal storage layer is a phase change thermal storage material.

[0012] In some embodiments, the phase change temperature range of the phase change thermal storage layer is 30-55°C.

[0013] In some embodiments, the water circulation loop further includes a circulating water pump, one end of which is connected to the solar thermal collector, and the other end of which is respectively connected to the phase change thermal storage unit and the water tank.

[0014] In some embodiments, the water circulation loop also includes a water circulation branch, which is connected in parallel with the water tank. A second stop valve is provided on the water circulation branch, and another circuit of the phase change thermal storage unit is connected in series to the water circulation branch.

[0015] In some embodiments, the water circulation loop further includes a first stop valve, which is connected in series with the water tank and then in parallel with the water circulation branch.

[0016] In some embodiments, the refrigerant circulation loop further includes a four-way valve, and the indoor heat exchanger is connected to the compressor via the four-way valve.

[0017] In some embodiments, the refrigerant circulation loop also includes a first throttle, a second throttle and a third throttle, one end of the first throttle is connected to the indoor heat exchanger, the other end of the first throttle is respectively connected to the second throttle and the third throttle, the second throttle is connected to the phase change heat storage unit, and the third throttle is connected to the water tank.

[0018] In some embodiments, the refrigerant circulation loop further includes a second heat exchanger and a fourth throttle, and the second heat exchanger and the fourth throttle are connected in series and in parallel with the phase change thermal storage unit.

[0019] According to another aspect of the present application, an embodiment of the present invention provides a control method for an integrated air-conditioning and hot water system, which is used to control the integrated air-conditioning and hot water system, including:

[0020] Determine the current season and control the working mode of the air conditioning and hot water system according to the season, specifically:

[0021] In summer, the refrigerant discharged from the compressor enters the phase change thermal storage unit and the water tank to release heat;

[0022] Then it enters the indoor heat exchanger to absorb heat;

[0023] Then it enters the compressor to complete the refrigeration of the refrigerant circulation circuit;

[0024] In winter, the refrigerant discharged from the compressor enters the indoor heat exchanger and water tank to release heat;

[0025] Then it enters the phase change thermal storage unit to absorb the heat stored in the phase change thermal storage unit;

[0026] It then enters the compressor to complete the heating of the refrigerant circulation circuit.

[0027] In some embodiments, the control method of the integrated air conditioning and hot water system further includes hot water production in a water circulation loop, specifically:

[0028] In winter, the circulating water pump drives the water in the water tank into the solar collector, where the water is heated and then enters the water tank and phase change thermal storage unit to release heat, completing the water circulation loop to produce hot water.

[0029] In summer, the circulating water pump drives water into the solar thermal collector, and the water enters the water tank after being heated in the solar thermal collector, completing the hot water production of the water circulation loop 1.

[0030] In some embodiments, the control method of the integrated air conditioning and hot water system further includes: in the transition season, the water circulation loop is specifically used to make hot water:

[0031] The circulating water pump drives the cold water in the water tank into the solar collector for heating;

[0032] When the water temperature in the water tank does not reach the set temperature, the first stop valve opens and the second stop valve closes, and the heated water enters the water tank for heating or replaces the cold water in the water tank, completing the hot water making process;

[0033] When the water temperature in the water tank reaches the set temperature, the first stop valve is closed, the second stop valve is opened, and the heated water enters the phase change heat storage unit to release heat, completing the heat storage process.

[0034] In some embodiments, when the phase change thermal storage unit has completed heat storage in summer or heat release in winter:

[0035] When the refrigerant circulation loop is used for refrigeration, when the temperature of the heat storage material is 5-10°C higher than the phase change temperature, the phase change heat storage unit has completed heat storage and releases heat through the second heat exchanger;

[0036] When the refrigerant circulation loop is used for heating, when the temperature of the heat storage material is 5-10°C higher than the ambient temperature, the phase change heat storage unit has completed heat release and absorbs heat through the second heat exchanger.

[0037] Compared with the prior art, on the one hand, the air conditioning and hot water integrated system provided by the present invention has at least the following beneficial effects:

[0038] Phase change thermal storage technology, solar energy technology and air source heat pump technology are combined. When solar energy is sufficient, phase change thermal storage technology is used to store the heat of solar energy and the condensation heat of the compressor in the phase change thermal storage unit. When solar energy is insufficient, heat is extracted from the phase change thermal storage unit for heating and / or hot water, realizing the transfer of heat in time and space.

[0039] In addition, storing the heat from solar energy and the condensation heat from the compressor improves energy utilization efficiency and reduces thermal pollution. The heat extracted from the phase change thermal storage unit is used for heating and / or hot water. The extracted heat is combined with the current heat to increase the heating capacity in winter and avoid the problem of frequent frosting of air source heat pumps in winter.

[0040] On the other hand, the control method of the air-conditioning hot water system provided by the present invention is designed based on the above-mentioned air-conditioning hot water system. Its beneficial effects refer to the beneficial effects of the above-mentioned air-conditioning hot water system, which will not be elaborated here.

[0041] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a structural schematic diagram of an air conditioning and hot water integrated system provided by an embodiment of the present invention;

[0043] Figure 2 is another structural schematic diagram of an air conditioning and hot water integrated system provided by an embodiment of the present invention;

[0044] Figure 3 It is a flow chart of a control method of an integrated air conditioning and hot water system provided by an embodiment of the present invention.

[0045] in:

[0046] 1. Water circulation loop; 2. Refrigerant circulation loop; 3. Phase change thermal storage unit; 11. Solar collector; 12. Water tank; 13. Circulating water pump; 14. First stop valve; 15. Water circulation branch; 16. Second stop valve; 21. Compressor; 22. Indoor heat exchanger; 23. Four-way valve; 24. First throttle; 25. Second throttle; 26. Third throttle; 27. Second heat exchanger; 28. Fourth throttle; 31. First heat exchanger; 32. Phase change thermal storage layer. DETAILED DESCRIPTION

[0047] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention application are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0048] In the description of the present invention, it should be clarified that terms such as "vertical", "lateral", "longitudinal", "front", "rear", "left", "right", "up", "down", and "horizontal" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are merely for the convenience of describing the present invention. They do not mean that the devices or elements referred to must have a specific direction or position, and therefore cannot be understood as limitations on the present invention.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Example 1

[0051] This embodiment provides an integrated air conditioning and hot water system. Figure 1 As shown, the air conditioning and hot water integrated system includes: a water circulation loop 1, a refrigerant circulation loop 2 and a phase change heat storage unit; wherein, a solar collector 11 and a water tank 12 are arranged on the water circulation loop 1, and the solar collector 11 and the water tank 12 are connected; a compressor 21 and an indoor heat exchanger 22 are arranged on the refrigerant circulation loop 2, and the compressor 21 and the indoor heat exchanger 22 are connected; the phase change heat storage unit 3 includes two flow paths, and the two ends of one path are respectively connected to the indoor heat exchanger 22 and the compressor 21; the first end of the other path of the phase change heat storage unit 3 is connected to the pipeline between the outlet of the solar collector 11 and the water tank 12, and the second end is connected to the pipeline between the inlet of the solar collector 11 and the water tank 12.

[0052] Specifically, when the indoor heat exchanger 22 is used as an evaporator, the refrigerant discharged from the compressor 21 enters the phase change thermal storage unit 3 and the water tank 12 to exchange heat, and then enters the indoor heat exchanger 22 to absorb heat;

[0053] When the indoor heat exchanger 22 is used as a condenser, the refrigerant discharged from the compressor 21 enters the indoor heat exchanger 22 and the water tank 12 to release heat, and then enters the phase change thermal storage unit 3 to exchange heat.

[0054] In this way, the above structure is adopted to combine the solar collector 11, the indoor heat exchanger 22 in the air source heat pump, and the phase change thermal storage unit 3. When the solar collector 11 can collect sufficient heat, the phase change thermal storage unit 3 is used to store the heat of the solar energy and the condensation heat of the compressor 21 in the phase change thermal storage unit 3. When the solar collector 11 cannot collect sufficient solar energy, heat is extracted from the phase change thermal storage unit 3 for heating and / or hot water, thereby realizing the transfer of heat in time and space, improving energy utilization efficiency, and reducing thermal pollution; at the same time, it also increases the heating amount in winter, avoiding the problem of frequent frost on the indoor heat exchanger 22 in winter.

[0055] In some embodiments:

[0056] The phase-change heat storage unit 3 includes a first heat exchanger 31 and a phase-change heat storage layer 32 . The phase-change heat storage layer 32 wraps the first heat exchanger 31 .

[0057] Specifically, the first heat exchanger 31 can be a heat exchanger of any structure such as a finned tube heat exchanger, a spiral coil heat exchanger, a serpentine tube heat exchanger, etc. The tube of the first heat exchanger 31 is used to carry water or refrigerant, and the phase change heat storage layer 32 is encapsulated on the outside of the tube.

[0058] Specifically, the phase change heat storage layer 32 is a phase change heat storage material, preferably a composite phase change heat storage material, and the phase change temperature range of the phase change heat storage layer 32 is: 30-55°C.

[0059] Phase change thermal storage is a high-tech energy storage technology based on phase change thermal storage materials or composite phase change thermal storage materials. Phase change thermal storage has been widely studied due to its advantages of constant temperature and high thermal storage density, and is particularly suitable for conditions where heat supply is discontinuous or supply and demand are not coordinated. Phase change thermal storage technology is an effective means to solve the contradiction between energy supply time and space, and is one of the important ways to improve energy utilization. It can be used to solve the contradiction between thermal energy supply and demand.

[0060] In the summer when cooling and hot water production are required, the first heat exchanger 31 and the water tank heat exchanger are used as condensers, and the indoor heat exchanger 22 is used as an evaporator; while the indoor heat exchanger 22 provides cooling for the room, the condensation heat of the compressor 21 is stored in the phase change heat storage layer 32 and the water tank 12. If the water temperature in the water tank does not reach the set temperature, the water circulation loop 1 provides heat to the water tank 12 when there is sufficient solar energy, and the water circulation loop 15 provides heat to the water tank when there is insufficient solar energy.

[0061] In winter, when heating and hot water production are required, when solar energy is sufficient, the solar energy provides heat to the water circulation loop 1 on the one hand, and provides heat to the phase change heat storage unit 3 on the other hand; when solar energy is insufficient, the first heat exchanger 31 is used as an evaporator, and the indoor heat exchanger 22 is used as a condenser, and the indoor heat exchanger 22 extracts the heat stored in the phase change heat storage layer 32 for the water circulation loop 1 and the refrigerant circulation loop 2; in this way, the utilization rate of solar energy is improved, and at the same time, the problems caused by frost on the indoor heat exchanger 22 are reduced.

[0062] In some embodiments:

[0063] The water circulation loop 1 also includes a circulating water pump 13 , one end of which is connected to the solar collector 11 , and the other end of which is respectively connected to the phase change thermal storage unit 3 and the water tank 12 , for driving the circulating water in the water circulation loop 1 into the solar collector 11 .

[0064] In some embodiments:

[0065] The water circulation loop 1 also includes a water circulation branch 15 , which is connected in parallel with the water tank 12 . A second stop valve 16 is provided on the water circulation branch 15 , and another circuit of the phase change thermal storage unit 3 is connected in series to the water circulation branch 15 .

[0066] The water circulation loop 1 further includes a first stop valve 14 , which is connected in series with the water tank 12 and then in parallel with the water circulation branch 15 .

[0067] In a specific embodiment:

[0068] The first stop valve 14 and the second stop valve 16 are both opened or closed according to the actual heat load; for example, when the solar energy is sufficient, the first stop valve 14 and the second stop valve 16 are both opened, and the solar energy is not only used to provide heat, but the excess solar energy is also stored; when the solar energy is insufficient, the first stop valve 14 is opened and the second stop valve 16 is closed, and the solar energy is only used to provide heat. When the heat cannot meet the demand, the phase change thermal storage unit 3 will release heat to participate in heating.

[0069] In a specific embodiment:

[0070] The refrigerant circulation circuit 2 further includes a four-way valve 23 , and the indoor heat exchanger 22 is connected to the compressor 21 via the four-way valve 23 .

[0071] Specifically, Figure 1 As shown, the four ports of the four-way valve 23 are respectively: E port, S port, C port and D port. The positions of the slide valves of the four-way valve 23 are different, and the corresponding water circulation circuits 1 and refrigerant circulation circuits 2 are different.

[0072] In some embodiments, the refrigerant circulation loop 2 also includes a first throttle 24, a second throttle 25 and a third throttle 26, one end of the first throttle 24 is connected to the indoor heat exchanger 22, the other end of the first throttle 24 is respectively connected to the second throttle 25 and the third throttle 26, the second throttle 25 is connected to the phase change heat storage unit 3, and the third throttle 26 is connected to the water tank 12.

[0073] The first throttle 24, the second throttle 25 and the third throttle 26 have three functions in the air conditioning and hot water integrated system; the first is to convert high-temperature and high-pressure liquid into low-temperature and low-pressure liquid; to provide boiling conditions for the refrigerant in the evaporator; the second is to automatically adjust the system refrigerant flow rate and adjust its evaporation temperature according to changes in the system load; the third is to control the range of superheat at the evaporator outlet and give full play to the heat exchange efficiency of the evaporator.

[0074] In some embodiments, Figure 2 As shown, the refrigerant circulation circuit 2 further includes a second heat exchanger 27 and a fourth throttle 28 , and the second heat exchanger 27 and the fourth throttle 28 are connected in series and then connected in parallel with the phase change heat storage unit 3 .

[0075] In this way, during cooling or heating, heat can be released or absorbed through the second heat exchanger 27, which can avoid affecting efficiency and user experience due to the completion of heat storage or heat release of the phase change heat storage unit 3.

[0076] The working process of an air conditioning and hot water integrated system provided in this embodiment is as follows:

[0077] In the hot water and cooling mode in summer, the heat exchanger in the water tank 12 and the first heat exchanger 31 in the phase change heat storage unit 3 act as a condenser, and the indoor heat exchanger 22 acts as an evaporator. While the indoor heat exchanger 22 provides cooling for the room, the condensation heat is stored in the water tank 12 and the phase change heat storage layer 32. Solar energy participates in the water circulation according to the load demand to provide heat for the water tank 12, which can reduce the waste of condensation heat and improve energy utilization efficiency.

[0078] In this mode, the sliding valve of the four-way valve 23 moves up, the E port and the S port are connected, the D port and the C port are connected, the first throttle 24, the second throttle 25 and the third throttle 26 are opened according to the logic control, and the first stop valve 14 and the second stop valve 16 are opened or closed according to the heat load.

[0079] The working process of the refrigerant circulation loop 2 is as follows: the high-temperature and high-pressure refrigerant gas discharged from the compressor 21 is divided into two paths, one path passes through the four-way valve 23 to enter the phase change heat storage unit 3, and the other path enters the water tank 12, and the condensation heat is stored in the phase change heat storage layer 32 and the water. Then, it passes through the second throttle 25 and the third throttle 26 for throttling and pressure reduction, and then merges, passes through the first throttle 24 to enter the first heat exchanger 31, absorbs heat in the indoor air and evaporates, and then passes through the four-way valve 23 to enter the compressor 21 to complete the cycle.

[0080] The working process of the water circulation loop 1 is as follows: the cold water in the water tank 12 enters the solar collector 11 driven by the circulating water pump 13, is heated therein, and then enters the water tank 12 through the second stop valve 16 to complete the circulation.

[0081] In the winter working condition of hot water and heating mode, when there is sufficient sunlight, solar energy provides heat to the water tank on the one hand, reducing the heat load on the water tank side, and on the other hand provides heat to the phase change heat storage unit 3; when there is insufficient sunlight, the indoor heat exchanger 22 and the heat exchanger in the water tank 12 act as condensers, and the first heat exchanger 31 in the phase change heat storage unit 3 acts as an evaporator. The indoor heat exchanger 22 extracts the heat stored in the phase change heat storage unit 3 for use in the indoor environment and the water tank 12, which can improve the utilization efficiency of solar energy, increase the heating evaporation temperature of the indoor heat exchanger 22 and thereby increase the heating amount, and reduce the problems caused by frosting and defrosting.

[0082] In this mode, the four-way valve slide moves downward, the E port and the D port are connected, the S port and the C port are connected, the first throttle 24, the second throttle 25 and the third throttle 26 are opened according to the logic control, and the first stop valve 14 and the second stop valve 16 are opened or closed according to the heat load.

[0083] The working process of the refrigerant circulation loop 2 is as follows: the high-temperature and high-pressure refrigerant gas discharged from the compressor 21 is divided into two paths, one path passes through the four-way valve 23 to enter the indoor heat exchanger 22, and the other path enters the water tank 12. After the refrigerant releases heat to the indoor environment and water, it passes through the first throttle 24 and the third throttle 26 for throttling and pressure reduction, and then merges, passes through the second throttle 25 to enter the phase change heat storage unit 3, absorbs the heat stored in the phase change heat storage material, and then passes through the four-way valve 23 to enter the compressor 21 to complete the cycle.

[0084] The working process of the water circulation loop 1 is as follows: the circulating water enters the solar collector 11 driven by the circulating water pump 13, and is divided into two paths after being heated therein, and respectively enters the water tank 12 and the phase change thermal storage unit 3 to heat the water and phase change thermal storage material therein, and then enters the circulating water pump 13 again after merging to complete the cycle.

[0085] In the transition season hot water making mode, when there is sufficient sunlight, solar energy provides heat for the water tank 12 and the phase change heat storage unit 3; when there is insufficient sunlight, the heat exchanger in the water tank 12 acts as a condenser, the first heat exchanger 31 in the phase change heat storage unit 3 acts as an evaporator, and the indoor heat exchanger 22 extracts the heat stored in the phase change heat storage unit 3 for use in the water tank 12, which can improve the utilization efficiency of solar thermal energy.

[0086] In this mode, the four-way valve slide moves downward, the E port and the D port are connected, the S port and the C port are connected, the first throttle 24 is closed, the second throttle 25 and the third throttle 26 are opened according to the logic control, and the first stop valve 14 and the second stop valve 16 are opened or closed according to the heat load.

[0087] The working process of the refrigerant circulation loop 2 is as follows: the high-temperature and high-pressure refrigerant gas discharged from the compressor 21 enters the water tank 12. After the refrigerant releases heat to the water in the water tank 12, it enters the phase change heat storage unit 3 after throttling and reducing the pressure through the third throttle 26 and the second throttle 25, where it absorbs the heat stored in the phase change heat storage material, and then enters the compressor 21 through the four-way valve 23 to complete the cycle.

[0088] The working process of the water circulation loop 1 is divided into two situations: when the heat collection amount of the solar collector 11 reaches the preset condition, the circulating water enters the solar collector 11 under the drive of the circulating water pump 13, the first stop valve 14 and the second stop valve 16 are both opened, and the heated water enters the water tank 12 and the phase change thermal storage unit 3 to heat the water and the phase change thermal storage material therein, and then enters the circulating water pump 13 again after merging to complete the cycle, complete the hot water production, and also complete the heat storage; when the heat collection amount of the solar collector 11 does not reach the preset condition, the first stop valve 14 is opened, the second stop valve 16 is closed, and the heated water enters the water tank 12 to release heat to complete the hot water production.

[0089] Example 2

[0090] This embodiment provides a control method for an air conditioning and hot water integrated system. Figure 3 As shown, it is used to control the air conditioning and hot water integrated system of Example 1, including:

[0091] S11, determine the current season;

[0092] S12, controlling the working mode of the air conditioning and hot water integrated system according to the season, specifically:

[0093] In summer, S121, the refrigerant discharged from the compressor 21 enters the phase change thermal storage unit 3 and the water tank 12 to release heat;

[0094] S122, then enters the indoor heat exchanger 22 to absorb heat;

[0095] S123, then enters the compressor 21 to complete the refrigeration of the refrigerant circulation loop 2;

[0096] In winter, S1201, the refrigerant discharged from the compressor 21 enters the indoor heat exchanger 22 and the water tank 12 to release heat;

[0097] S1202, then enter the phase change thermal storage unit 3 to absorb the heat stored in the phase change thermal storage unit 3;

[0098] S1203, then enters the compressor 21 to complete the heating of the refrigerant circulation circuit 2.

[0099] In this way, this embodiment combines the solar collector 11, the indoor heat exchanger 22 in the air source heat pump, and the phase change thermal storage unit 3. When the solar collector 11 can collect sufficient heat, the phase change thermal storage unit 3 is used to store the heat of the solar energy and the condensation heat of the compressor 21 in the phase change thermal storage unit 3. When the solar collector 11 cannot collect sufficient solar energy, heat is extracted from the phase change thermal storage unit 3 for heating and / or hot water, thereby realizing the transfer of heat in time and space, improving energy utilization efficiency, and reducing thermal pollution; at the same time, it also increases the heating amount in winter, avoiding the problem of frequent frosting of the indoor heat exchanger 22 in winter.

[0100] In some embodiments:

[0101] In summer, the air conditioning and hot water system is used for cooling and hot water production;

[0102] Refrigeration is specifically:

[0103] The condensation heat discharged from the compressor 21 enters the phase change heat storage unit 3 and the water tank 12 to release heat; then, it enters the indoor heat exchanger 22 after throttling and pressure reduction, absorbs the heat of the air in the indoor heat exchanger 22 and evaporates, and then enters the compressor 21 through the four-way valve 23 to complete the refrigeration;

[0104] Hot water production is specifically as follows:

[0105] The circulating water pump 13 drives the cold water in the water tank 12 to enter the solar collector 11 , and after being heated in the solar collector 11 , the cold water enters the water tank 12 and the phase change thermal storage unit 3 to release heat, thus completing the hot water production of the water circulation loop 1 .

[0106] Specifically, in this mode, the heat exchanger in the water tank 12 and the first heat exchanger 31 in the phase change heat storage unit 3 act as a condenser, and the indoor heat exchanger 22 acts as an evaporator. The indoor heat exchanger 22 provides cooling for the room while storing the condensation heat in the water tank 12 and the phase change heat storage layer 32. Solar energy participates in the water circulation according to the load demand to provide heat for the water tank 12; the four-way valve 23 slides upward, the E port and the S port are connected, the D port and the C port are connected, the first throttle 24, the second throttle 25 and the third throttle 26 are logically controlled to control the opening, and the first stop valve 14 and the second stop valve 16 are opened or closed according to the heat load.

[0107] The working process of the refrigerant circulation loop 2 is as follows: the high-temperature and high-pressure refrigerant gas discharged from the compressor 21 is divided into two paths, one path passes through the four-way valve 23 to enter the phase change heat storage unit 3, and the other path enters the water tank 12, and the condensation heat is stored in the phase change heat storage layer 32 and the water. Then, it passes through the second throttle 25 and the third throttle 26 for throttling and pressure reduction, and then merges, passes through the first throttle 24 to enter the first heat exchanger 31, absorbs heat in the indoor air and evaporates, and then passes through the four-way valve 23 to enter the compressor 21 to complete the cycle.

[0108] The working process of the water circulation loop 1 is as follows: the cold water in the water tank 12 enters the solar collector 11 driven by the circulating water pump 13, is heated therein, and then enters the water tank 12 through the second stop valve 16 to complete the circulation.

[0109] In a specific embodiment:

[0110] In winter, the air conditioning and hot water system is used for heating and hot water production;

[0111] Heating is as follows:

[0112] The condensation heat discharged from the compressor 21 enters the indoor heat exchanger 22 and the water tank 12 to release heat, and then enters the phase change heat storage unit 3 after throttling and pressure reduction and absorbs the heat stored in the phase change heat storage unit 3, and then enters the compressor 21 through the four-way valve 23 to complete heating;

[0113] Hot water production is specifically as follows:

[0114] The circulating water pump 13 drives the cold water to enter the solar thermal collector 11, and the cold water enters the water tank 12 after being heated in the solar thermal collector 11, thereby completing the hot water production.

[0115] Specifically, when there is sufficient sunlight, solar energy provides heat to the water tank on the one hand, reducing the heat load on the water tank side, and provides heat to the phase change heat storage unit 3 on the other hand; when there is insufficient sunlight, the indoor heat exchanger 22 and the heat exchanger in the water tank 12 act as condensers, and the first heat exchanger 31 in the phase change heat storage unit 3 acts as an evaporator. The indoor heat exchanger 22 extracts the heat stored in the phase change heat storage unit 3 for use in the indoor environment and the water tank 12, which can improve the utilization efficiency of solar energy, increase the heating evaporation temperature of the indoor heat exchanger 22 and thereby increase the heating amount, and reduce the problems caused by frosting and defrosting.

[0116] In this mode, the four-way valve slide moves downward, the E port and the D port are connected, the S port and the C port are connected, the first throttle 24, the second throttle 25 and the third throttle 26 are opened according to the logic control, and the first stop valve 14 and the second stop valve 16 are opened or closed according to the heat load.

[0117] The working process of the refrigerant circulation loop 2 is as follows: the high-temperature and high-pressure refrigerant gas discharged from the compressor 21 is divided into two paths, one path passes through the four-way valve 23 to enter the indoor heat exchanger 22, and the other path enters the water tank 12. After the refrigerant releases heat to the indoor environment and water, it passes through the first throttle 24 and the third throttle 26 for throttling and pressure reduction, and then merges, passes through the second throttle 25 to enter the phase change heat storage unit 3, absorbs the heat stored in the phase change heat storage material, and then passes through the four-way valve 23 to enter the compressor 21 to complete the cycle.

[0118] The working process of the water circulation loop 1 is as follows: the circulating water enters the solar collector 11 driven by the circulating water pump 13, and is divided into two paths after being heated therein, and respectively enters the water tank 12 and the phase change thermal storage unit 3 to heat the water and phase change thermal storage material therein, and then enters the circulating water pump 13 again after merging to complete the cycle.

[0119] In a specific embodiment:

[0120] During the transition season, the air conditioning and hot water integrated system is used to produce hot water. The specific steps for producing hot water are:

[0121] The circulating water pump 13 drives water into the solar thermal collector 11 for heating;

[0122] When the water temperature in the water tank 12 does not reach the set temperature, the first stop valve 14 is opened, the second stop valve 16 is closed, and the heated water enters the water tank 12 to heat or replace the cold water in the water tank, completing the hot water making process;

[0123] When the water temperature in the water tank 12 reaches the set temperature, the first stop valve 14 is closed, the second stop valve 16 is opened, and the heated water enters the phase change heat storage unit 3 to release heat, completing the heat storage process.

[0124] Specifically, when there is sufficient sunlight, solar energy provides heat for the water tank 12 and the phase change heat storage unit 3; when there is insufficient sunlight, the heat exchanger in the water tank 12 acts as a condenser, the first heat exchanger 31 in the phase change heat storage unit 3 acts as an evaporator, and the indoor heat exchanger 22 extracts the heat stored in the phase change heat storage unit 3 for use in the water tank 12, thereby improving the utilization efficiency of solar thermal energy.

[0125] In this mode, the four-way valve slide moves downward, the E port and the D port are connected, the S port and the C port are connected, the first throttle 24 is closed, the second throttle 25 and the third throttle 26 are opened according to the logic control, and the first stop valve 14 and the second stop valve 16 are opened or closed according to the heat load.

[0126] The working process of the refrigerant circulation loop 2 is as follows: the high-temperature and high-pressure refrigerant gas discharged from the compressor 21 enters the water tank 12. After the refrigerant releases heat to the water in the water tank 12, it enters the phase change heat storage unit 3 after throttling and reducing the pressure through the third throttle 26 and the second throttle 25, where it absorbs the heat stored in the phase change heat storage material, and then enters the compressor 21 through the four-way valve 23 to complete the cycle.

[0127] The working process of the water circulation loop 1 is as follows: the circulating water enters the solar collector 11 driven by the circulating water pump 13, and is divided into two paths after being heated therein, and respectively enters the water tank 12 and the phase change thermal storage unit 3 to heat the water and phase change thermal storage material therein, and then enters the circulating water pump 13 again after merging to complete the cycle.

[0128] In addition, in a specific embodiment, the method further comprises:

[0129] In cooling mode, the temperature of the heat storage material is 5-10°C higher than the phase change temperature, indicating that the phase change heat storage unit has completed heat storage and releases heat to the outside through the second heat exchanger 27; in heating mode, the temperature of the heat storage material is 5-10°C higher than the ambient temperature, indicating that the phase change heat storage unit has completed heat release and absorbs heat through the second heat exchanger 27; in this way, the user experience is prevented from being affected by the phase change heat storage unit 3 being unable to continue to absorb heat after completing heat storage or being unable to continue to release heat after completing heat release.

[0130] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous technical features can be freely combined and superimposed.

[0131] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. An integrated air conditioning and hot water system, characterized in that: The air conditioning and hot water integrated system comprises: A water circulation loop (1), wherein a solar collector (11) and a water tank (12) are arranged on the water circulation loop (1), and the solar collector (11) and the water tank (12) are connected; A refrigerant circulation circuit (2), wherein a compressor (21) and an indoor heat exchanger (22) are provided on the refrigerant circulation circuit (2), and the compressor (21) and the indoor heat exchanger (22) are connected; The water circulation loop (1) further comprises a water circulation branch (15), wherein the water circulation branch (15) is connected in parallel with the water tank (12), and a second stop valve (16) is provided on the water circulation branch (15); A phase-change heat storage unit (3), wherein the phase-change heat storage unit (3) comprises two flow paths, wherein two ends of one flow path are respectively connected to an indoor heat exchanger (22) and a compressor (21); The other circuit of the phase-change heat storage unit (3) is connected in series to the water circulation branch (15); a first end of the other circuit of the phase-change heat storage unit (3) is connected to the pipeline between the outlet of the solar thermal collector (11) and the water tank (12), and a second end is connected to the pipeline between the inlet of the solar thermal collector (11) and the water tank (12); The water circulation loop (1) further comprises a first stop valve (14), wherein the first stop valve (14) is connected in series with the water tank (12) and then connected in parallel with the water circulation branch (15); When the indoor heat exchanger (22) is used as an evaporator, the refrigerant discharged from the compressor (21) enters the phase-change heat storage unit (3) and the water tank (12) to exchange heat, and then enters the indoor heat exchanger (22) to absorb heat; when the indoor heat exchanger (22) is used as a condenser, the refrigerant discharged from the compressor (21) enters the indoor heat exchanger (22) and the water tank (12) to release heat, and then enters the phase-change heat storage unit (3) to exchange heat; The phase-change heat storage unit (3) comprises a first heat exchanger (31) and a phase-change heat storage layer (32), wherein the phase-change heat storage layer (32) wraps the first heat exchanger (31).

2. The integrated air conditioning and hot water system according to claim 1, characterized in that: The phase change heat storage layer (32) is a phase change heat storage material.

3. The integrated air conditioning and hot water system according to claim 1 or 2, characterized in that: The phase change temperature range of the phase change heat storage layer (32) is 30-55°C.

4. The integrated air conditioning and hot water system according to claim 3, characterized in that: The water circulation loop (1) further comprises a circulating water pump (13), one end of the circulating water pump (13) being connected to the solar thermal collector (11), and the other end of the circulating water pump (13) being respectively connected to the phase change thermal storage unit (3) and the water tank (12).

5. The integrated air conditioning and hot water system according to claim 1, characterized in that: The refrigerant circulation circuit (2) further comprises a four-way valve (23), and the indoor heat exchanger (22) is connected to the compressor (21) via the four-way valve (23).

6. The integrated air conditioning and hot water system according to claim 5, characterized in that: The refrigerant circulation circuit (2) further comprises a first throttle (24), a second throttle (25) and a third throttle (26); one end of the first throttle (24) is connected to the indoor heat exchanger (22); the other end of the first throttle (24) is respectively connected to the second throttle (25) and the third throttle (26); the second throttle (25) is connected to the phase change heat storage unit (3); and the third throttle (26) is connected to the water tank (12).

7. The integrated air conditioning and hot water system according to claim 6, characterized in that: The refrigerant circulation circuit (2) further comprises a second heat exchanger (27) and a fourth throttle (28); the second heat exchanger (27) and the fourth throttle (28) are connected in series and then in parallel with the phase change heat storage unit (3).

8. A control method for an air conditioning and hot water integrated system, characterized in that: It is used to control the air conditioning and hot water integrated system according to any one of claims 1 to 7, comprising: Determine the current season, and control the working mode of the air conditioning and hot water integrated system according to the season, specifically: In summer, the refrigerant discharged from the compressor (21) enters the phase-change heat storage unit (3) and the water tank (12) to release heat; Then it enters the indoor heat exchanger (22) to absorb heat; Then, it enters the compressor (21) to complete the refrigeration of the refrigerant circulation circuit (2); In winter, the refrigerant discharged from the compressor (21) enters the indoor heat exchanger (22) and the water tank (12) to release heat; Then, it enters the phase-change heat storage unit (3) to absorb the heat stored in the phase-change heat storage unit (3); Then it enters the compressor (21) to complete the heating of the refrigerant circulation circuit (2).

9. The control method of the air conditioning and hot water integrated system according to claim 8, characterized in that: The control method of the integrated air-conditioning and hot water system also includes hot water production in the water circulation loop (1), specifically: In winter, the circulating water pump (13) drives water to enter the solar thermal collector (11), and after being heated in the solar thermal collector (11), the water enters the water tank (12) and the phase change heat storage unit (3) to release heat, thereby completing the hot water production of the water circulation loop (1); In summer, the circulating water pump (13) drives water to enter the solar thermal collector (11), and after being heated in the solar thermal collector (11), the water enters the water tank (12) and the phase change heat storage unit, completing the hot water production of the water circulation loop (1).

10. The control method of the air conditioning and hot water integrated system according to claim 8 or 9, characterized in that: The control method of the air conditioning and hot water integrated system also includes: During the transition season, the water circulation loop (1) produces hot water as follows: The circulating water pump (13) drives water into the solar thermal collector (11) for heating; When the water temperature in the water tank (12) does not reach the set temperature, the first stop valve (14) is opened, the second stop valve (16) is closed, and the heated water enters the water tank (12) to heat or replace the cold water in the water tank, thereby completing the hot water making process; When the water temperature in the water tank (12) reaches a set temperature, the first stop valve (14) is closed, the second stop valve (16) is opened, and the heated water enters the phase change heat storage unit (3) to release heat, completing the heat storage process.

11. The control method of the air conditioning and hot water integrated system according to claim 8 or 9, characterized in that: When the phase change heat storage unit (3) has completed heat storage in summer or heat release in winter: When the refrigerant circulation loop (2) is used for refrigeration, when the temperature of the heat storage material is 5-10° C. higher than the phase change temperature, the phase change heat storage unit completes heat storage and releases heat through the second heat exchanger (27); When the refrigerant circulation loop (2) is used for heating, when the temperature of the heat storage material is 5-10° C. higher than the ambient temperature, the phase change heat storage unit has completed heat release and absorbs heat through the second heat exchanger (27).

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