Waste heat recovery system

Abstract

The present utility model relates to the technical field of heat energy cooling, and in particular to a waste heat recovery system. The waste heat recovery system comprises a steam compression unit, a heat source cooling unit and a heat recovery unit, wherein the steam compression unit comprises an evaporator, a compressor, a condenser and an expansion valve, and a refrigerant circulates in a refrigeration circuit formed by a first refrigerant flow channel of the evaporator, the compressor, a second refrigerant flow channel of the condenser and the expansion valve; the heat source cooling unit comprises a heat source, a cooling liquid tank and a first liquid pump, and a first cooling liquid circulates in a cooling circuit formed by the heat source, a first cooling liquid flow channel of the evaporator, the cooling liquid tank and the first liquid pump, to cool the heat source; and the heat recovery unit comprises a hot liquid tank and a second liquid pump, and a second cooling liquid circulates in a heating circuit formed by the hot liquid tank, the second liquid pump and a second cooling liquid flow channel of the condenser, to heat liquid in the hot liquid tank. The waste heat recovery system provided by the present utility model achieves the recovery and utilization of heat, reduces heat emission to the environment, and is environmentally friendly and energy-saving.

Description

A waste heat recovery system Technical Field

[0001] The utility model relates to the technical field of heat source cooling, in particular to a waste heat recovery system. Background Art

[0002] Solar energy storage and charging, as well as related equipment like charging and discharging, and testing, generates significant heat during operation, necessitating cooling of these high-temperature components. Existing cooling systems typically use fans to dissipate this heat into the atmosphere. This approach suffers from poor heat dissipation, high energy consumption, high costs, high noise levels, unusable heat emissions, and environmental pollution.

[0003] The invention patent with application number "202211569082.2" and name "Cooling system of charging system and control method thereof" discloses a cooling system, which includes a steam compression condensing unit and a forced convection cooling unit. The steam compression condensing unit and the forced convection cooling unit share an evaporator, and the power module is cooled by evaporating heat through the evaporator. Compared with simply using a fan, this method uses liquid cooling to dissipate heat and has a better cooling effect. However, a fan is still required to dissipate heat from the condenser in the steam compression condensing unit and discharge the heat into the atmospheric environment. Therefore, there is still the problem that heat energy cannot be reused and pollutes the environment. Technical issues

[0004] In order to solve the technical problem that heat energy in the existing cooling system cannot be reused and pollutes the environment, the utility model provides a waste heat recovery system that can recover waste heat generated by the heat source to provide heat energy for bathing, air conditioning, floor heating and other daily uses, thereby reducing heat emissions to the environment and being environmentally friendly and energy-saving. Technical Solutions

[0005] The technical solutions adopted in this utility model are as follows:

[0006] A waste heat recovery system comprising:

[0007] a vapor compression unit comprising an evaporator, a compressor, a condenser, and an expansion valve, the evaporator comprising a first refrigerant flow channel and a first coolant flow channel, the condenser comprising a second refrigerant flow channel and a second coolant flow channel, the refrigerant circulates in a refrigeration circuit formed by the first refrigerant flow channel, the compressor, the second refrigerant flow channel, and the expansion valve;

[0008] a heat source cooling unit, the heat source cooling unit comprising a heat source, a coolant tank, and a first liquid pump, wherein a first coolant circulates in a cooling circuit formed by the heat source, the first coolant flow channel, the coolant tank, and the first liquid pump to cool the heat source;

[0009] The heat recovery unit includes a hot liquid tank and a second liquid pump. The second coolant circulates in a heating loop formed by the hot liquid tank, the second liquid pump and the second coolant flow channel to heat the liquid in the hot liquid tank.

[0010] Optionally, the second coolant and the liquid in the hot liquid tank are water, and the hot liquid tank is provided with a liquid outlet, which is used to release hot water for use.

[0011] Optionally, the hot liquid tank is provided with a liquid outlet and a liquid return port, and the liquid outlet and the liquid return port are connected to a liquid heating pipe for heating. Preferably, the second coolant and the liquid in the hot liquid tank are water.

[0012] Furthermore, the hot liquid tank is provided with a liquid replenishing port, and a float valve is provided in the hot liquid tank, and the float valve is connected to the liquid replenishing port. When the liquid level in the hot liquid tank is lower than the set liquid level threshold, the float valve opens and the liquid replenishing port replenishes liquid into the hot liquid tank.

[0013] Furthermore, the hot liquid tank also includes a temperature sensor, a solenoid valve, a liquid filling port and an overflow port. The solenoid valve is connected to the liquid filling port. When the temperature sensor detects that the liquid temperature in the hot liquid tank exceeds the set high temperature threshold, the solenoid valve opens, and the liquid filling port forces cold liquid to be added into the hot liquid tank, and excess liquid flows out from the overflow port.

[0014] Furthermore, a temperature sensor and an electric heater are provided in the hot liquid tank. When the temperature sensor detects that the temperature of the liquid in the hot liquid tank is lower than a set low temperature threshold, the electric heater assists in heating.

[0015] Furthermore, there are at least two hot liquid tanks, and at least two of the hot liquid tanks are arranged in parallel or independently.

[0016] Furthermore, the heat source is a heat-generating component in the solar storage and charging system.

[0017] Furthermore, there are at least two heat sources, and at least two of the heat sources are connected in parallel.

[0018] Furthermore, a temperature measuring device is provided at the heat source, and when the temperature measuring device detects that the temperature reaches the starting condition, the heat source cooling unit, the steam compression unit and the heat recovery unit start working. Beneficial effects

[0019] Beneficial effects of the utility model:

[0020] The utility model provides a waste heat recovery system, which uses liquid cooling to cool the heat source, has a good cooling effect, and the entire system operates without a fan, with low energy consumption and low noise.

[0021] The utility model provides a waste heat recovery system which only needs to be connected to a heat source through a pipe joint and does not require the installation of a fan, is convenient for production installation and later maintenance, has a high protection level, and prolongs the service life of the entire system.

[0022] The utility model provides a waste heat recovery system, in which a first refrigerant flow channel and a first coolant flow channel are provided in the evaporator, and a second refrigerant flow channel and a second coolant flow channel are provided in the condenser, so as to ensure that each fluid circulates independently and dissipates heat sufficiently, and the heat source cooling unit, the steam compression unit and the heat recovery unit are relatively independent and have high reliability.

[0023] The utility model provides a waste heat recovery system, which completely converts the heat generated by the heat source into high-temperature thermal energy, and recycles it to provide the thermal energy needed for life, eliminating heat emissions to the environment, being environmentally friendly and energy-saving, and realizing the production of clean energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic structural diagram of a waste heat recovery system according to Example 1;

[0025] Figure 2 is a schematic diagram of the structure of the waste heat recovery system applied to the solar storage and charging system;

[0026] FIG3 is a schematic structural diagram of a waste heat recovery system according to a second embodiment.

[0027] in,

[0028] Vapor compression unit 1, evaporator 11, first refrigerant flow channel 111, first coolant flow channel 112, compressor 12, condenser 13, second refrigerant flow channel 131, second coolant flow channel 132, expansion valve 14, first connecting pipe 15;

[0029] Heat source cooling unit 2, heat source 21, coolant tank 22, first liquid pump 23, second connecting pipeline 24;

[0030] Heat recovery unit 3 , hot liquid tank 31 , liquid outlet 311 , liquid return port 312 , liquid replenishing port 313 , float valve 314 , temperature sensor 315 , solenoid valve 316 , overflow port 317 , electric heater 318 , second liquid pump 32 , and third connecting pipeline 33 . Best Mode for Carrying Out the Invention

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] The purpose of this utility model is to provide a waste heat recovery system, which includes three parts. The first part is a heat source cooling unit, which cools the heat source that generates heat. The second part is a steam compression unit, which exchanges heat with the heat source cooling unit through an evaporator. The third part is a heat recovery unit, which exchanges heat with the condenser in the steam compression unit. The recovered heat energy is used to provide living heat energy for bathing, air conditioning, floor heating, etc., thereby realizing heat recycling and reducing heat emissions to the environment. It is environmentally friendly and energy-saving. It also has the advantages of working without a fan during operation, reducing equipment size, reducing noise, saving energy, and reducing costs. This waste heat recovery system is not only suitable for photovoltaic charging and storage systems, and can cool down heat sources such as the charging system and energy storage system of photovoltaic charging and storage systems, but is also suitable for other use scenarios with large heat generation, and can also achieve heat recovery and reduce heat emissions. The following is a detailed description through specific embodiments. Example 1

[0033] As shown in FIG1 , this embodiment provides a waste heat recovery system, which includes a vapor compression unit 1, a heat source cooling unit 2 and a heat recovery unit 3, wherein the vapor compression unit 1 includes an evaporator 11, a compressor 12, a condenser 13 and an expansion valve 14, the evaporator 11 includes a first refrigerant flow channel 111 and a first coolant flow channel 112, the condenser 13 includes a second refrigerant flow channel 131 and a second coolant flow channel 132, the evaporator 11, the compressor 12, the condenser 13, the expansion valve 14 and the first connecting pipe 15 form a refrigeration circuit, and the refrigerant circulates in the refrigeration circuit; further, the heat source cooling unit 2 includes It includes a heat source 21, a coolant tank 22 and a first liquid pump 23. The heat source 21 is a heat-generating component / cooled component. The heat source 21, the first coolant flow channel 112 in the evaporator 11, the coolant tank 22, the first liquid pump 23 and the second connecting pipe 24 form a cooling circuit. The coolant circulates in the cooling circuit to cool the heat source 21. Furthermore, the heat recovery unit 3 includes a hot liquid tank 31 and a second liquid pump 32. The hot liquid tank 31, the second liquid pump 32, the second coolant flow channel 132 in the condenser 13 and the third connecting pipe 33 form a heating circuit. The second coolant circulates in the heating circuit to heat the liquid in the hot liquid tank 31.

[0034] In the heat source cooling unit 2, the cooling method of the heat source 21 is liquid cooling, and the first coolant in the coolant tank 22 circulates in the cooling circuit. Specifically, the first coolant can be selected from but not limited to water or ethylene glycol aqueous solution, etc., and is powered by the first liquid pump 23. The low-temperature fluid in the coolant tank 22 is input into the heat source 21. After absorbing the heat generated by the heat source 21, it becomes a medium-low temperature fluid and flows into the evaporator 11, and exchanges heat with the ultra-low temperature refrigerant in the evaporator 11. After releasing heat, it becomes a low-temperature liquid and flows into the coolant tank 22. In this way, the first coolant circulates in the cooling circuit.

[0035] In the vapor compression unit 1, the refrigerant circulates in the refrigeration circuit. Specifically, the refrigerant can be selected from but not limited to R32 refrigerant, R410A refrigerant, R134A refrigerant, etc. The compressor 12 performs work and compresses the refrigerant into an ultra-high temperature refrigerant. The ultra-high temperature refrigerant releases heat in the condenser 13 and becomes a medium temperature refrigerant. The medium temperature refrigerant is throttled by the expansion valve 14 and becomes an ultra-low temperature refrigerant. The refrigerant flows into the evaporator 11 to perform heat exchange with the medium and low temperature fluid in the cooling circuit. In this way, the refrigerant circulates in the refrigeration circuit.

[0036] In the heat recovery unit 3, the second coolant in the hot liquid tank 31 circulates in the heating circuit. Specifically, the second coolant can be, but is not limited to, water or an ethylene glycol aqueous solution. Powered by a second liquid pump 32, the medium-temperature fluid is input into the condenser 13, where it undergoes heat exchange with the ultra-high-temperature refrigerant in the refrigeration circuit. After absorbing heat, it becomes a high-temperature fluid, which then flows into the hot liquid tank 31, repeating the cycle until the set temperature is reached. It should be noted that although the second coolant in this embodiment has the word "cooling" in its name, this does not necessarily mean that it has a cooling function. Instead, it circulates in the heating circuit until the liquid in the hot liquid tank 31 reaches the set temperature.

[0037] In this way, the waste heat recovery system provided by this embodiment uses liquid cooling to cool the heat source 21. Compared with the existing technology, the entire system operates without a fan, has low energy consumption, low noise, and better heat dissipation and cooling effect; and it only needs to be connected to the heat source 21 through a pipe joint, without the need to install a fan, which is convenient for production installation and later maintenance, has a high level of protection, and a long service life of the entire system. The evaporator 11 of this embodiment is provided with a first refrigerant flow channel 111 and a first coolant flow channel 112, and the condenser 13 is provided with a second refrigerant flow channel 131 and a second coolant flow channel 132, to ensure that each fluid circulates independently and dissipates heat sufficiently, and the heat source cooling unit 2, the vapor compression unit 1 and the heat recovery unit 3 are relatively independent and highly reliable. Most importantly, this embodiment completely converts the heat generated by the heat source 21 into high-temperature thermal energy, and recycles it to provide the heat energy needed for life, eliminating heat emissions to the environment, being environmentally friendly and energy-saving, and realizing the production of clean energy.

[0038] As an embodiment of the present invention, a hot liquid tank 31 is used to provide hot water for bathing and other domestic uses. Specifically, the second coolant and the liquid in the hot liquid tank 31 are both water. The hot liquid tank 31 is provided with a liquid outlet 311, which is used to release hot water for bathing and other uses. Furthermore, this embodiment also provides a liquid replenishment port 313 on the hot liquid tank 31. The liquid replenishment port 313 is used to replenish tap water, and the replenished tap water is then heated to hot water for use. This embodiment also provides a float valve 314 to achieve automatic water replenishment. The float valve 314 is connected to the liquid replenishment port 313. When the liquid level in the hot liquid tank 31 is lower than the set liquid level threshold, the float ball descends, the valve of the float valve 314 opens, and tap water is replenished into the hot liquid tank 31 through the liquid replenishment port 313. When the water level is fully replenished, the float ball rises, causing the valve to close, stopping water replenishment.

[0039] Since the hot liquid tank 31 in this embodiment is used to provide hot water for bathing and other domestic purposes, it is necessary to ensure that the temperature of the liquid in the hot liquid tank 31 is always within a set temperature range. To this end, this embodiment provides a temperature sensor 315 to detect the water temperature in the hot liquid tank 31. When the water temperature exceeds the set high temperature threshold, the water is cooled by forced water replenishment; when the water temperature is lower than the set low temperature threshold, the water in the hot liquid tank 31 is heated by electric heating.

[0040] Specifically, in this embodiment, a temperature sensor 315 is provided in the hot liquid tank 31. A solenoid valve 316 and an overflow port 317 are also provided on the hot liquid tank 31. The solenoid valve 316 is connected to the liquid inlet 313. When the temperature sensor 315 detects that the water temperature in the hot liquid tank 31 exceeds a set high temperature threshold, the solenoid valve 316 opens, forcing cold tap water into the hot liquid tank 31 through the liquid inlet 313, causing the water level in the hot liquid tank 31 to rise. If the hot liquid tank 31 is large enough, tap water can be continuously added. However, there may be a special situation where too much water is added. Therefore, to ensure that there is sufficient space in the hot liquid tank to add tap water, an overflow port 317 is provided. Excess hot water flows out of the overflow port 317, ensuring that the water level remains safe in special circumstances and that the heat recovery system can function normally. The liquid inlet 313 can be positioned relatively far from the overflow port 317 so that the overflowed liquid is essentially hot water. In addition, it should be noted that the solenoid valve 316 and the float valve 314 are connected in parallel, that is, they are respectively connected to the liquid replenishing port 313, so as to ensure that water can be replenished when there is a lack of water or the water temperature is too high without affecting each other.

[0041] Furthermore, an electric heater 318 is installed within the hot liquid tank 31. When the temperature sensor 315 detects that the temperature of the second coolant, or water in the hot liquid tank 31, remains below a set low-temperature threshold after absorbing heat from the condenser 13 and circulating in the heating circuit for a certain period of time, the electric heater 318 activates auxiliary heating to ensure that the water temperature meets the actual hot water temperature. Furthermore, in winter, when the water temperature is too low, the low-temperature threshold can be set to an appropriate antifreeze temperature to prevent ice from forming and damage to pipes and equipment.

[0042] Preferably, there are at least two heat sources 21 in this embodiment, and at least two heat sources 21 are connected in parallel, so that the heat emitted by each heat source 21 will not be transferred to the next heat source 21. That is to say, the inlet of each heat source 21 is a low-temperature fluid, thereby ensuring the cooling effect of each heat source 21.

[0043] Preferably, in this embodiment, a temperature measuring device is provided at each heat source 21. When the temperature measuring device detects that the temperature has reached the starting condition, the heat source cooling unit 2, the vapor compression unit 1, and the heat recovery unit 3 begin to operate. Specifically, first, the first liquid pump 23 is turned on, and the first coolant begins to circulate. Subsequently, the vapor compression unit is turned on to transfer heat to the heat recovery unit. Then, the second liquid pump 32 is turned on, and the second coolant begins to circulate. The temperature of the water in the hot liquid tank 31 rises. At this time, the temperature of the hot liquid tank 31 is detected to meet the set constant temperature for domestic hot water required for bathing, etc. When the water temperature is too high, appropriate water replenishment is performed to control the temperature. When the water temperature is too low, the electric heater 318 is turned on to control the temperature according to the situation. When the water level is too low, water replenishment is automatically performed.

[0044] The waste heat recovery system of this embodiment can be used in a solar-energy storage and charging system, forming a solar-energy storage and charging system. Specifically, as shown in Figure 2, the solar-energy storage and charging system includes a photovoltaic system, a power grid, a distribution system, an energy storage system, and charging piles. The photovoltaic system and the power grid supply power to the distribution system; the energy storage system discharges power to the distribution system during peak hours and draws power from the distribution system during off-peak hours; the charging piles also draw power from the distribution system to charge vehicles and other charging devices; and the distribution system also provides electricity for daily use. There are multiple charging and discharging processes in the solar storage and charging system, and a large amount of heat will be generated during the charging and discharging process. This embodiment applies the above-mentioned waste heat recovery system to the solar storage and charging system to form a solar storage and charging heat system. On the one hand, the solar storage and charging system needs to be maintained in a reasonable operating temperature range, generally around 25°C. A lower temperature can be set as required to cool the energy storage system, charging piles and other heat-generating components / heat sources in the solar storage and charging system, improve the heat exchange efficiency, meet the high-power charging and heat dissipation requirements, and ensure the efficient and stable operation of the solar storage and charging system; on the other hand, the heat in the solar storage and charging heat is the heat recovered by the heat-generating devices in the cooling charging and discharging process. The recovered heat is used for domestic hot water such as bathing, reducing heat emissions to the environment and being environmentally friendly and energy-saving.

[0045] Of course, in other embodiments, the waste heat recovery system can also be applied to other scenarios to perform cooling and waste heat recovery.

[0046] From the above content, it can be seen that the waste heat recovery system provided in this embodiment adopts liquid cooling for cooling, which has a good cooling effect. At the same time, it also realizes heat recovery and utilization, reduces heat emissions to the environment, is environmentally friendly and energy-saving, and also has the advantages of no fan operation during operation, reduced equipment size, reduced noise, energy saving, and reduced costs. Example 2

[0047] As shown in FIG3 , this embodiment provides a waste heat recovery system, which also includes a heat source cooling unit 2 , a steam compression unit 1 and a heat recovery unit 3 . The difference from the first embodiment is that the hot water tank in this embodiment is used to provide heat energy requirements for air conditioning, floor heating, etc.

[0048] Specifically, the hot liquid tank 31 of this embodiment is provided with a liquid outlet 311 and a liquid return port 312, and the liquid outlet 311 and the liquid return port 312 are connected to a liquid heating pipe for heating, and the liquid heating pipe is part of the air conditioner or floor heating and is used to provide heat energy for heating. In Example 1, the liquid outlet is used to release hot water for use, and the water will not return to the hot liquid tank after use. In this embodiment, the liquid discharged from the liquid outlet 311 exchanges heat with the cold air in the room and then continues to return to the hot liquid tank 31 through the liquid return port 312, and so on. In other embodiments, the liquid heating pipe can also be directly connected in series in the heating circuit, that is, one end of the hot liquid tank 31 close to the second liquid pump 32 and the other end close to the condenser 13 are directly formed as the liquid outlet and the liquid return port, respectively.

[0049] The second coolant and the liquid in the hot liquid tank 31 of this embodiment may be selected from but not limited to water or ethylene glycol aqueous solution, preferably water.

[0050] Similar to the first embodiment, the hot liquid tank 31 of this embodiment further includes a temperature sensor 315, a solenoid valve 316, a liquid inlet 313, and an overflow port 317. The solenoid valve 316 is connected to the liquid inlet 313. When the temperature sensor 315 detects that the temperature of the liquid in the hot liquid tank 31 exceeds a predetermined high temperature threshold for heating, the solenoid valve 316 opens, forcing the liquid inlet 313 to replenish the hot liquid tank 31, with excess liquid flowing out of the overflow port 317. Similarly, this embodiment further includes an electric heater 318. When the temperature sensor 315 detects that the temperature of the liquid in the hot liquid tank 31 falls below a predetermined low temperature threshold for heating or antifreeze, the electric heater 318 provides auxiliary heating. Furthermore, the hot liquid tank 31 of this embodiment further includes a float valve 314 connected to the liquid inlet 313. When the second coolant level becomes too low due to evaporation or other reasons, the float valve 314 opens, allowing liquid to be replenished into the hot liquid tank 31 through the liquid inlet 313.

[0051] The waste heat recovery system of this embodiment is also applicable to, but not limited to, scenarios such as solar-storage-charging systems. Other parts can be implemented with reference to the first embodiment and will not be described in detail here.

[0052] From the above content, it can be seen that the waste heat recovery system provided in this embodiment can convert the heat generated by the heat source into thermal energy for use in air conditioning, floor heating, etc., thereby realizing the recycling of thermal energy and reducing heat emissions to the environment. Example 3

[0053] This embodiment provides a waste heat recovery system, also including a heat source cooling unit 2, a vapor compression unit 1, and a heat recovery unit 3. This embodiment differs from the first and second embodiments in that at least two hot liquid tanks 31 are provided in this embodiment, and at least two hot liquid tanks 31 are connected in parallel. That is, the inlet of each hot liquid tank 31 is fed with high-temperature fluid after heat exchange in the condenser 13, resulting in more uniform heating. Each hot liquid tank 31 can all adopt the solution for providing hot water for bathing in the first embodiment, or all adopt the solution for providing heat for air conditioning and floor heating in the second embodiment. Furthermore, the solutions of the first and second embodiments can be combined, and this embodiment does not impose any restrictions on this.

[0054] Preferably, each hot liquid tank 31 can also be set up independently and adopt an independent heating circuit, that is, multiple second coolant flow channels 132 are set in the condenser 13, and each coolant flow channel 132 corresponds to a hot liquid tank 31 and a second liquid pump 32 to form a heating circuit, and the liquids in each heating circuit do not affect each other.

[0055] The waste heat recovery system of this embodiment can be optionally applied to, but not limited to, scenarios such as solar-storage-charging systems. Other parts can be implemented with reference to Embodiment 1 / Embodiment 2 and will not be described in detail here.

[0056] From the above content, it can be seen that the waste heat recovery system provided in this embodiment can convert the heat generated by the heat source into thermal energy for use in bathing, air conditioning, floor heating, etc., thereby realizing the recycling of thermal energy and reducing heat emissions to the environment.

[0057] In the description of the present invention, “plurality” means two or more, unless otherwise clearly defined.

[0058] In the present invention, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements.

[0059] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

Claims

1. A waste heat recovery system, characterized in that: include: A vapor compression unit (1), the vapor compression unit (1) comprising an evaporator (11), a compressor (12), a condenser (13) and an expansion valve (14), the evaporator (11) comprising a first refrigerant flow channel (111) and a first coolant flow channel (112), the condenser (13) comprising a second refrigerant flow channel (131) and a second coolant flow channel (132), and the refrigerant circulates in a refrigeration circuit formed by the first refrigerant flow channel (111), the compressor (12), the second refrigerant flow channel (131) and the expansion valve (14); A heat source cooling unit (2), the heat source cooling unit (2) comprising a heat source (21), a cooling liquid tank (22) and a first liquid pump (23), wherein a first cooling liquid circulates in a cooling circuit formed by the heat source (21), the first cooling liquid flow channel (112), the cooling liquid tank (22) and the first liquid pump (23) to cool the heat source (21); A heat recovery unit (3), the heat recovery unit (3) comprising a hot liquid tank (31) and a second liquid pump (32), wherein the second coolant circulates in a heating circuit formed by the hot liquid tank (31), the second liquid pump (32) and the second coolant flow channel (132), thereby heating the liquid in the hot liquid tank (31).

2. The waste heat recovery system according to claim 1, characterized in that: The liquid in the second coolant and the hot liquid tank (31) is water, and the hot liquid tank (31) is provided with a liquid outlet (311), and the liquid outlet (311) is used to release hot water for use.

3. The waste heat recovery system according to claim 1, characterized in that: The hot liquid tank (31) is provided with a liquid outlet (311) and a liquid return outlet (312), and the liquid outlet (311) and the liquid return outlet (312) are connected to a liquid heating pipe for heating.

4. The waste heat recovery system according to claim 2 or 3, characterized in that: The hot liquid tank (31) is also provided with a liquid replenishing port (313). A float valve (314) is provided in the hot liquid tank (31). The float valve (314) is connected to the liquid replenishing port (313). When the liquid level in the hot liquid tank (31) is lower than a set liquid level threshold, the float valve (314) opens, and the liquid replenishing port (313) replenishes liquid into the hot liquid tank (31).

5. The waste heat recovery system according to claim 2 or 3, characterized in that: The hot liquid tank (31) further comprises a temperature sensor (315), a solenoid valve (316), a liquid replenishing port (313) and an overflow port (317); the solenoid valve (316) is connected to the liquid replenishing port (313); when the temperature sensor (315) detects that the temperature of the liquid in the hot liquid tank (31) exceeds a set high temperature threshold, the solenoid valve (316) opens, the liquid replenishing port (313) forcibly replenishes cold liquid into the hot liquid tank (31), and excess liquid flows out from the overflow port (317).

6. The waste heat recovery system according to claim 2 or 3, characterized in that: A temperature sensor (315) and an electric heater (318) are also provided in the hot liquid tank (31). When the temperature sensor (315) detects that the temperature of the liquid in the hot liquid tank (31) is lower than a set low temperature threshold, the electric heater (318) performs auxiliary heating.

7. The waste heat recovery system according to claim 1, characterized in that: There are at least two hot liquid tanks (31), and at least two of the hot liquid tanks (31) are arranged in parallel or independently.

8. The waste heat recovery system according to claim 1, characterized in that: The heat source (21) is a heat generating component in the solar storage and charging system.

9. The waste heat recovery system according to claim 1 or 8, characterized in that: There are at least two heat sources (21), and at least two of the heat sources (21) are connected in parallel.

10. The waste heat recovery system according to claim 1 or 8, characterized in that: A temperature measuring device is provided at the heat source (21), and when the temperature measuring device detects that the temperature reaches a start-up condition, the heat source cooling unit (2), the steam compression unit (1) and the heat recovery unit (3) start to work.

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