Multi-mode hot water supply system

Abstract

The utility model relates to the technical field of high-temperature heat pumps and waste heat recovery, and discloses a multi-mode hot water supply system. The multi-mode hot water supply system comprises a low-temperature-stage heat pump module, a high-temperature-stage heat pump module, a phase change heat reservoir and a condensation evaporator. The condensation evaporator is connected with at least one of the low-temperature-stage condenser, the low-temperature-stage evaporator, the high-temperature-stage evaporator and the high-temperature-stage condenser, and the low-temperature-stage evaporator is communicated with a waste heat water source. At least one of the low-temperature-stage condenser, the high-temperature-stage condenser and the phase-change heat reservoir communicates with a circulating water source and is used for heating circulating water to a preset temperature. According to the multi-mode hot water supply system, hot water of 40-145 DEG C can be provided according to different heat using temperatures, different operation modes are switched according to different peak and valley electricity prices, and the overall energy efficiency of a unit can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to high temperature heat pump and waste heat recovery technical field, especially in a kind of multi-mode hot water supply system. BACKGROUND

[0002] In the high-temperature water source heat pump field, when the waste heat side water temperature is higher, such as 40-60 ℃ waste heat water temperature, single-stage system is used, and higher outlet water temperature, such as 90-120 ℃, can be realized, but the range of water temperature that can be provided is relatively small, and it is not suitable for low waste heat occasions. When the waste heat side water temperature is lower, a cascade system is generally used for heating, but compared with the peak-valley time-of-use electricity price phase change heat storage, the power consumption is larger, and the range of water temperature provided is relatively small.

[0003] Single-stage system is used for heating, and higher outlet water temperature, such as 120 ℃, can be realized, but increasing the outlet water temperature will be limited by the waste heat side water temperature, which will cause the system to be out of the normal operating range, and this system is also not suitable for low waste heat occasions, such as 10-30 ℃ waste heat occasions. Although the cascade system can solve the problem of low waste heat source water temperature, the overall unit power consumption is large, and the range of water temperature that can be provided is relatively small.

[0004] The utility model discloses a kind of multi-mode hot water supply systems for the above problems, which can realize wide temperature range heating. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the problem that heating temperature range is limited in prior art, and provides a kind of multi-mode hot water supply system, which realizes wide temperature range efficient heating by multi-mode heating collaborative control, realizes flexible mode switching and energy efficient utilization.

[0006] To solve the above technical problems, the embodiment of the utility model discloses a kind of multi-mode hot water supply systems, it includes:

[0007] Low-temperature stage heat pump module, comprising low-temperature stage compressor, low-temperature stage condenser, low-temperature stage expansion valve and low-temperature stage evaporator connected in sequence;

[0008] High-temperature stage heat pump module, comprising high-temperature stage compressor, high-temperature stage condenser, high-temperature stage expansion valve and high-temperature stage evaporator connected in sequence;

[0009] Phase change heat storage, the phase change heat storage is connected with at least one of low-temperature stage condenser, high-temperature stage evaporator and high-temperature stage condenser;

[0010] Condensing evaporator, the condensing evaporator is connected with at least one of low-temperature stage condenser, low-temperature stage evaporator and high-temperature stage evaporator;

[0011] The low-temperature stage evaporator is in communication with a waste heat water source, and at least one of the low-temperature stage condenser, the high-temperature stage condenser and the phase change heat accumulator is in communication with a circulating water source, for heating the circulating water to a predetermined temperature.

[0012] In an embodiment of the first aspect, the multi-mode hot water supply system further comprises a water pump assembly, the water pump assembly comprising:

[0013] a first water pump disposed on a pipeline between the phase change heat accumulator and the low-temperature stage condenser;

[0014] a second water pump disposed on a pipeline between the phase change heat accumulator and the high-temperature stage evaporator; and

[0015] a third water pump disposed on a pipeline for input of the circulating water.

[0016] Preferably, one or more of the first water pump, the second water pump and the third water pump is a variable frequency water pump.

[0017] In an embodiment of the first aspect, the multi-mode hot water supply system further comprises:

[0018] a third three-way valve, a first valve port, a second valve port and a third valve port of the third three-way valve being connected with the high-temperature stage evaporator, a third valve port of a fifth three-way valve and a circulating water outlet pipeline respectively;

[0019] a fourth three-way valve, a first valve port, a second valve port and a third valve port of the fourth three-way valve being connected with the high-temperature stage evaporator, a third valve port of a sixth three-way valve and a circulating water source respectively;

[0020] a fifth three-way valve, a first valve port, a second valve port and a third valve port of the fifth three-way valve being connected with the low-temperature stage condenser, the phase change heat accumulator and a second valve port of the third three-way valve respectively; and

[0021] a sixth three-way valve, a first valve port, a second valve port and a third valve port of the sixth three-way valve being connected with the low-temperature stage condenser, the phase change heat accumulator and the high-temperature stage evaporator respectively.

[0022] In an embodiment of the first aspect, the multi-mode hot water supply system further comprises:

[0023] a first three-way valve, a first valve port, a second valve port and a third valve port of the first three-way valve being connected with the condensing evaporator, the low-temperature stage evaporator and the low-temperature stage condenser respectively; and

[0024] a second three-way valve, a first valve port, a second valve port and a third valve port of the second three-way valve being connected with the low-temperature stage compressor, the low-temperature stage condenser and the condensing evaporator respectively.

[0025] In an embodiment of the first aspect, the multi-mode hot water supply system further comprises:

[0026] a seventh three-way valve, first, second and third valve ports of which are connected with the high-temperature stage condenser, the high-temperature stage evaporator and the condensing evaporator respectively; and

[0027] an eighth three-way valve, first, second and third valve ports of which are connected with the high-temperature stage compressor, the high-temperature stage evaporator and the condensing evaporator respectively.

[0028] In an implementation form of the first aspect, the second valve port and the third valve port of the first three-way valve are communicated, the second valve port and the third valve port of the fourth three-way valve are communicated, the second valve port and the third valve port of the fifth three-way valve are communicated, and the second valve port and the third valve port of the sixth three-way valve are communicated.

[0029] In an implementation form of the first aspect, the second valve port and the third valve port of the first three-way valve are communicated, the first valve port and the second valve port of the second three-way valve are communicated, the second valve port and the third valve port of the fourth three-way valve are communicated, the first valve port and the third valve port of the fifth three-way valve are communicated, and the first valve port and the third valve port of the sixth three-way valve are communicated.

[0030] In an implementation form of the first aspect, the first valve port and the second valve port of the fourth three-way valve are communicated, the second valve port and the third valve port of the fifth three-way valve are communicated, the second valve port and the third valve port of the sixth three-way valve are communicated, and the first valve port and the second valve port of the seventh three-way valve are communicated.

[0031] In an implementation form of the first aspect, the first valve port and the second valve port of the first three-way valve are communicated, the first valve port and the third valve port of the second three-way valve are communicated, the first valve port and the third valve port of the seventh three-way valve are communicated, and the first valve port and the third valve port of the eighth three-way valve are communicated.

[0032] In an implementation form of the first aspect, the predetermined temperature is 40-145℃.

[0033] Compared with the prior art, the application has the beneficial effects that 40-145℃ hot water can be provided according to different heat utilization temperatures, and different operation modes can be switched by using different peak-valley electricity prices, so that the overall energy efficiency of the unit can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 A schematic view of a multi-mode hot water supply system in the utility model is shown;

[0035] Figure 2 A schematic view of a valve port of any three-way valve in the utility model is shown.

[0036] BRIEF DESCRIPTION OF DRAWINGS

[0037] 1, low temperature stage evaporator; 2, low temperature stage electronic expansion valve; 3, low temperature stage compressor; 4, first three-way valve; 5, second three-way valve; 6, low temperature stage condenser; 7, condensing evaporator; 8, first water pump; 9, second water pump; 10, third three-way valve; 11, fourth three-way valve; 12, fifth three-way valve; 13, sixth three-way valve; 14, seventh three-way valve; 15, high temperature stage electronic expansion valve; 16, high temperature stage evaporator; 17, eighth three-way valve; 18, phase change heat accumulator; 19, high temperature stage compressor; 20, high temperature stage condenser; 21, third water pump. DETAILED DESCRIPTION

[0038] The following will illustrate the embodiments of the present application by specific examples, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the present application.

[0039] In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0040] The terms "first", "second", and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "provided", "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present embodiment can be understood according to the specific circumstances.

[0042] In order to facilitate subsequent understanding, the professional terms appearing in this paper are further explained as follows:

[0043] Circulating water is a broad term referring to the water circulating in the entire multi-mode heating system, including user-side circulating water, heated supply water, and water in other possible paths.

[0044] User-side circulating water is the low-temperature stage of circulating water after use at the user end, and is part of the circulating water, referring to the cooled circulating water flowing back to the system at the user end.

[0045] The return water pipeline of the user-side circulating water is defined as a complete path in which low-temperature circulating water discharged by a user-side water equipment (such as a heating pipe network or a process equipment) returns to the multi-mode heat supply system for heating.

[0046] The heat storage side circulating water refers to waste heat water flowing through the heat storage side heat exchange pipeline, and the function thereof is to transfer heat in the externally input waste heat water to the phase change material in the phase change heat storage module, so as to realize heat storage.

[0047] The waste heat side circulating water refers to a medium flowing in a closed loop between the phase change heat storage module and the high-temperature level evaporator, and the heat source thereof is the heat storage of the phase change material, and the waste heat side circulating water provides a waste heat source for the high-temperature level heat pump module.

[0048] To make the purpose, technical scheme and advantages of the utility model clearer, the following will combine the attached Figure 1 and the attached Figure 2 to further describe the embodiments of the utility model in detail.

[0049] The utility model proposes a kind of multi-mode hot water supply system, be configured to provide heat to user-side circulating water, comprising: waste heat water input pipeline, for inputting external waste heat water;Low-temperature level heat pump module, include by low-temperature level compressor 3, low-temperature level condenser 6, low-temperature level expansion valve 2 and low-temperature level evaporator 1 by first pipeline sequentially connected and formed first closed loop, first closed loop is filled with low-temperature level refrigerant;High-temperature level heat pump module, include by high-temperature level compressor 19, high-temperature level condenser 20, high-temperature level expansion valve 15 and high-temperature level evaporator 16 by second pipeline sequentially connected and formed second closed loop, second closed loop is filled with high-temperature level refrigerant;First closed loop is the refrigerant circulation loop of low-temperature level heat pump module;Second closed loop is the refrigerant circulation loop of high-temperature level heat pump module;Phase change heat storage module, include phase change heat storage 18, phase change material filled in phase change heat storage 18, heat storage side heat exchange pipeline and exothermic side heat exchange pipeline;Condensation evaporator 7 is set between low-temperature level heat pump module and high-temperature level heat pump module;Switching valve group module, including three-way valve assembly and water pump assembly, be configured to be used to switch the flow path of user-side circulating water and waste heat water.

[0050] In some embodiments, the multi-mode hot water supply system further includes a water pump assembly, which includes: a second water pump 9 arranged at the outlet of the heat storage side heat exchange pipeline, for driving the waste heat water to flow into the high-temperature level heat pump module;A third water pump 21 is arranged at the inlet end of the return water pipeline of the user-side circulating water, for driving the flow of the user-side circulating water according to the water supply pressure of the user end.

[0051] In one embodiment, the three-way valve assembly includes a first three-way valve 4, a second three-way valve 5, a third three-way valve 10, a fourth three-way valve 11, a fifth three-way valve 12, a sixth three-way valve 13, a seventh three-way valve 14, and an eighth three-way valve 17.

[0052] The multi-mode hot water supply system can be switched to any of the following modes of operation by switching the on-off state of the valve group module.

[0053] Phase change thermal storage mode :

[0054] According to the different peak-valley electricity prices, the phase change heat storage is carried out during the valley electricity period: the waste water at 5-30℃ enters the low-temperature level evaporator 1, the refrigerant absorbs the waste water heat to enter the low-temperature level compressor 3, enters the low-temperature level condenser 6 through the second three-way valve 5 (the first valve port and the second valve port are connected), heats the circulating water passing through the low-temperature level condenser 6, and the refrigerant cooled from the low-temperature level condenser 6 enters the low-temperature level evaporator 1 through the first three-way valve 4 (the second valve port and the third valve port are connected) after being throttled and decompressed by the low-temperature level electronic expansion valve 2, so as to complete a heat cycle process. The water heated by the low-temperature level condenser 6 enters the 90℃ phase change heat storage device 18 through the fifth three-way valve 12 (the first valve port and the second valve port are connected), heats the phase change material, and then enters the first water pump 8 through the sixth three-way valve 13 (the first valve port and the second valve port are connected) to complete the water circulation after being pressurized, the entire system continues to operate, the phase change material changes from solid to liquid, and other components do not participate in operation, and finally the phase change heat storage is completed.

[0055] Phase change direct heating mode:

[0056] The heat released by the phase change material heats the user side circulating water and outputs to the user end; the low-temperature level direct heating mode: the waste water releases heat to the low-temperature level refrigerant through the low-temperature level evaporator 1, the low-temperature level refrigerant is compressed and heats the user side circulating water at the low-temperature level condenser 6 and outputs to the user end; the phase change composite heating mode: the user side circulating water is heated and output to the user end through the high-temperature level condenser 20, and the heat required for the high-temperature level refrigerant cycle is provided by the phase change heat storage module; the cascade heating mode: the low-temperature level refrigerant transfers heat to the high-temperature level through the condenser evaporator 7, the high-temperature level refrigerant is compressed and heats the user side circulating water at the high-temperature level condenser 20 and outputs to the user end.

[0057] Specifically, in the phase change direct heating mode, the exothermic side inlet of the phase change heat accumulator 18 is connected to the third valve port of the sixth three-way valve 13, the exothermic side outlet of the phase change heat accumulator 18 is connected to the second valve port of the fifth three-way valve 12, and the user-side circulating water is pressurized by the third water pump 21 and then flows through the fourth three-way valve 11 and the sixth three-way valve 13 in sequence, enters the exothermic side heat exchange pipeline of the phase change heat accumulator 18, wherein the second valve port and the third valve port of the fourth three-way valve 11 are in communication to form a water inlet channel, and the second valve port and the third valve port of the sixth three-way valve 13 are in communication to guide the water flow into the exothermic side pipeline of the phase change heat accumulator 18 to absorb the heat released by the phase change material, and the water temperature is raised to the target temperature. The heated circulating water continues to flow through the fifth three-way valve 12 and the third three-way valve 10, and is delivered to the user end to realize direct independent heating of the phase change heat storage module, wherein the second valve port and the third valve port of the fifth three-way valve 12 are in communication, and the second valve port and the third valve port of the third three-way valve 10 are in communication.

[0058] In the phase change direct heating mode, the difference between the target outlet water temperature and the actual temperature of the user side can be monitored in real time, and the speed of the third water pump 21 is dynamically adjusted by using the PID algorithm. When the actual temperature is lower than the set value, the flow is increased, and vice versa to improve the heat exchange efficiency.

[0059] At the same time, the low-temperature stage compressor 3, the high-temperature stage compressor 19 and the condenser evaporator 7 are all stopped, the second valve port and the third valve port of the first three-way valve 4 are closed, and the first valve port and the second valve port of the second three-way valve 5 are closed, so as to block the circuit of the low-temperature stage refrigerant and the circuit of the high-temperature stage refrigerant, and ensure that the heat energy is only transmitted through the phase change heat storage module.

[0060] According to the phase change direct heating mode, the temperature of the circulating water output to the user end can reach 40-90℃.

[0061] Low-temperature stage direct heating mode:

[0062] When the phase change heat storage module cannot meet the outlet water temperature demand of the user end due to insufficient stored heat or failure, the multi-mode hot water supply system switches to the low-temperature stage direct heating mode.

[0063] Specifically, the waste heat water flows through the low-temperature stage evaporator 1, releases low-grade heat to the low-temperature stage refrigerant, and the low-temperature stage refrigerant absorbs heat and enters the low-temperature stage compressor 3 to be compressed into high-temperature and high-pressure gas. The high-temperature and high-pressure gas enters the low-temperature stage condenser 6 through the second three-way valve 5, wherein the first valve port and the second valve port of the second three-way valve 5 are in communication, exchanges heat with the user-side circulating water in the low-temperature stage condenser 6, releases condensation heat to heat the user-side circulating water to the target temperature, and the high-temperature and high-pressure gas itself condenses into liquid and then flows through the first three-way valve 4 and enters the low-temperature stage electronic expansion valve 2 to throttle and depressurize, forming low-temperature and low-pressure two-phase fluid, wherein the second valve port and the third valve port of the first three-way valve 4 are in communication. The low-temperature and low-pressure two-phase fluid formed by throttling and depressurizing enters the low-temperature stage evaporator 1, absorbs low-grade heat in the waste heat water, and evaporates into gas, and finally returns to the low-temperature stage compressor 3.

[0064] The user-side circulating water is driven by the third water pump 21 after being pressurized, and then flows through the fourth three-way valve 11 and the sixth three-way valve 13 in turn, wherein the second valve port and the third valve port of the fourth three-way valve 11 are in communication, and the first valve port and the third valve port of the sixth three-way valve 13 are in communication. The user-side circulating water enters the low-temperature stage condenser 6, and the user-side circulating water absorbs the heat released by the low-temperature stage refrigerant in the low-temperature stage condenser 6, and the heated circulating water flows out from the outlet of the low-temperature stage condenser 6, and then flows through the fifth three-way valve 12 and the third three-way valve 10 in turn, wherein the first valve port and the third valve port of the fifth three-way valve 12 are in communication, and the second valve port and the third valve port of the third three-way valve 10 are in communication, and finally the circulating water is guided to the user end. The related valves of the high-temperature stage heat pump module and the phase change heat storage module remain closed state, ensuring that the heat energy is only transmitted through the low-temperature stage heat pump module.

[0065] According to the low-temperature stage direct heating mode, the temperature of the circulating water output to the user end can reach 40℃-90℃.

[0066] High temperature level direct heating mode

[0067] When the heat demand is relatively high, the phase change composite heating mode is adopted. Specifically, the user-side circulating water is driven by the third water pump 21 after being pressurized, and directly enters the high-temperature condenser 20. The high-temperature gaseous refrigerant discharged by the high-temperature compressor 19 releases condensation heat in the high-temperature condenser 20, and the user-side circulating water is heated to the target temperature and output to the user end; at the same time, the residual heat side water in the phase change heat accumulator 18 is heated after absorbing the heat released by the phase change material, and is guided to flow through the channel formed by the second valve port and the third valve port of the fifth three-way valve 12, and then enters the third three-way valve 10 and is guided to flow through the first valve port and the second valve port, and then is pressurized by the second water pump 9 and delivered to the high-temperature evaporator 16 to release heat to the high-temperature refrigerant. The residual heat side water after heat release continues to flow through the fourth three-way valve 11, and then returns to the phase change heat accumulator 18 through the outlet channel formed by the first valve port and the second valve port of the fourth three-way valve 11 and the second valve port and the third valve port of the sixth three-way valve 13, and is reheated, thereby forming a complete closed loop circulation circuit.

[0068] The high-temperature refrigerant from the outlet of the high-temperature compressor 19 enters the high-temperature condenser 20 to release heat and condense, and the liquid refrigerant is throttled and depressurized by the high-temperature electronic expansion valve 15, and then enters the high-temperature evaporator 16 through the first valve port and the second valve port of the seventh three-way valve 14 to absorb heat and evaporate, and then returns to the high-temperature compressor 19 through the first valve port and the second valve port of the eighth three-way valve 17, thereby completing the circulation of the high-temperature heat pump module.

[0069] The low-temperature heat pump module and the condenser evaporator 7 are stopped, and the low-temperature circuit is blocked, so that heat energy is only transmitted through the high-temperature heat pump module and the phase change heat accumulator module.

[0070] According to the phase change composite heating mode, the temperature of the circulating water output to the user end can reach 90-145°C.

[0071] In the phase change composite heating mode, the speed of the third water pump 21 can be dynamically adjusted according to the difference between the target outlet water temperature and the actual outlet water temperature of the user end through the PID algorithm, so as to adjust the flow of the user-side circulating water. When the actual temperature is lower than the target value, the speed of the third water pump 21 is increased to increase the flow; when the actual temperature is higher than the target value, the speed is reduced to reduce the flow, thereby enhancing the heat exchange efficiency.

[0072] Cascade heating mode

[0073] When the phase change heat accumulator 18 cannot provide waste heat for the high-temperature stage heat pump module, the multi-mode hot water supply system can be switched to the cascade heating mode, specifically, in the cascade heating mode, the high-temperature gaseous refrigerant discharged by the low-temperature stage compressor 3 enters the condensing side channel of the condensing evaporator 7 through the second three-way valve 5, and the low-temperature stage refrigerant liquefies after heating the high-temperature stage refrigerant by releasing condensing heat, wherein the first valve port and the third valve port of the second three-way valve 5 are in communication, the liquid low-temperature stage refrigerant flows out from the condensing side outlet of the condensing evaporator 7, and enters the low-temperature stage electronic expansion valve 2 through the first three-way valve 4 for throttling and pressure reduction, wherein the first valve port and the second valve port of the first three-way valve 4 are in communication, to form low-temperature and low-pressure fluid, which is evaporated into gaseous state after absorbing heat from the waste heat source in the low-temperature stage evaporator 1, and finally returns to the low-temperature stage compressor 3.

[0074] The high-temperature gaseous refrigerant discharged by the high-temperature stage compressor 19 enters the high-temperature stage condenser 20, liquefies after heating the user-side circulating water to 90-145 DEG C by releasing condensing heat, and finally guides the circulating water to the user end; the liquid refrigerant is throttled and pressure-reduced by the high-temperature stage electronic expansion valve 15, enters the evaporation side channel of the condensing evaporator 7 through the seventh three-way valve 14, wherein the first valve port and the third valve port of the seventh three-way valve 14 are in communication, absorbs heat released by the low-temperature stage refrigerant to evaporate into gaseous state, and the high-temperature stage refrigerant flows out from the evaporation side outlet of the condensing evaporator 7 and returns to the high-temperature stage compressor 19 through the eighth three-way valve 17, wherein the first valve port and the third valve port of the eighth three-way valve 17 are in communication.

[0075] By switching the communication state of the valve group module, the low-temperature stage heat pump module and the high-temperature stage heat pump module are ensured to be in cooperative heat exchange and no path is in series flow.

[0076] According to the cascade heating mode, the temperature of the circulating water output to the user end can reach 90-145 DEG C.

[0077] The multi-mode hot water supply system provided by the utility model realizes wide-temperature-range efficient heating, flexible mode switching and energy efficient utilization through multi-mode heating cooperative control.

[0078] Although the utility model has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood that the above description is a further detailed description of the utility model in combination with specific embodiments, and the specific implementation of the utility model cannot be limited to these descriptions. Those skilled in the art can make various changes in form and details, including making a number of simple inferences or substitutions, without departing from the spirit and scope of the utility model.

Claims

1. A multi-mode hot water supply system, characterized in that, The multi-mode hot water supply system includes: The low-temperature heat pump module includes a low-temperature compressor, a low-temperature condenser, a low-temperature expansion valve, and a low-temperature evaporator connected in sequence. The high-temperature heat pump module includes a high-temperature compressor, a high-temperature condenser, a high-temperature expansion valve, and a high-temperature evaporator connected in sequence. A phase change thermal energy storage device, wherein the phase change thermal energy storage device is connected to at least one of a low-temperature stage condenser, a high-temperature stage evaporator, and a high-temperature stage condenser; A condensing evaporator, wherein the condensing evaporator is connected to at least one of a low-temperature stage condenser, a low-temperature stage evaporator, and a high-temperature stage evaporator; The low-temperature evaporator is connected to the waste water source, and at least one of the low-temperature condenser, high-temperature condenser and phase change heat storage device is connected to the circulating water source to heat the circulating water to a predetermined temperature.

2. The multi-mode hot water supply system as described in claim 1, characterized in that, It also includes a water pump assembly, the water pump assembly comprising: The first water pump is installed on the pipeline between the phase change heat storage device and the low temperature stage condenser. A second water pump is installed on the pipeline between the phase change thermal storage unit and the high-temperature evaporator; and... The third water pump is installed on the pipeline used for input circulating water.

3. The multi-mode hot water supply system as described in claim 2, characterized in that, Also includes: The third three-way valve has its first, second, and third valve ports connected to the high-temperature evaporator, the third valve port of the fifth three-way valve, and the circulating water outlet pipe, respectively. The fourth three-way valve has its first, second, and third ports connected to the high-temperature evaporator, the third port of the sixth three-way valve, and the circulating water source, respectively. The fifth three-way valve has its first, second, and third valve ports connected to the low-temperature stage condenser, the phase change heat storage device, and the second valve port of the third three-way valve, respectively. The sixth three-way valve has its first, second, and third ports connected to the low-temperature condenser, phase change heat storage unit, and high-temperature evaporator, respectively.

4. The multi-mode hot water supply system as described in claim 3, characterized in that, Also includes: The first three-way valve has its first valve port, second valve port, and third valve port connected to the condenser-evaporator, the low-temperature evaporator, and the low-temperature condenser, respectively. The second three-way valve has its first, second, and third ports connected to the cryogenic compressor, cryogenic condenser, and condenser-evaporator, respectively.

5. The multi-mode hot water supply system as described in claim 4, characterized in that, Also includes: The seventh three-way valve has its first valve port, second valve port, and third valve port connected to the high-temperature stage condenser, the high-temperature stage evaporator, and the condenser-evaporator, respectively. as well as The eighth three-way valve has its first, second, and third ports connected to the high-temperature stage compressor, the high-temperature stage evaporator, and the condenser-evaporator, respectively.

6. The multi-mode hot water supply system as described in claim 3, characterized in that, The second and third valve ports of the third three-way valve are connected, the second and third valve ports of the fourth three-way valve are connected, the second and third valve ports of the fifth three-way valve are connected, and the second and third valve ports of the sixth three-way valve are connected.

7. The multi-mode hot water supply system as described in claim 4, characterized in that, The second and third valve ports of the first three-way valve are connected, the first and second valve ports of the second three-way valve are connected, the second and third valve ports of the fourth three-way valve are connected, the first and third valve ports of the fifth three-way valve are connected, and the first and third valve ports of the sixth three-way valve are connected.

8. The multi-mode hot water supply system as described in claim 5, characterized in that, The first and second valve ports of the fourth three-way valve are connected, the second and third valve ports of the fifth three-way valve are connected, the second and third valve ports of the sixth three-way valve are connected, and the first and second valve ports of the seventh three-way valve are connected.

9. The multi-mode hot water supply system as described in claim 5, characterized in that, The first valve port of the first three-way valve is connected to the second valve port, the first valve port of the second three-way valve is connected to the third valve port, the first valve port of the seventh three-way valve is connected to the third valve port, and the first valve port of the eighth three-way valve is connected to the third valve port.

10. The multi-mode hot water supply system as described in any one of claims 1-9, characterized in that, The predetermined temperature is 40-145℃.

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