Waste heat utilization heat pump hot water system

Abstract

The utility model discloses a waste heat utilization heat pump hot water system, and relates to the technical field of heat pump equipment, the waste heat utilization heat pump hot water system comprises a water supply assembly, and the water supply assembly comprises a cold water tank, a hot water storage container and a shower; a first heat exchanger used for exchanging heat with shower waste water is arranged between the cold water tank and the hot water storage container, new water flows into the cold water tank from the first cold water inlet, absorbs heat of the shower waste water through the first heat exchanger and then flows into the hot water storage container, and the hot water storage container is provided with a hot water outlet directly or indirectly communicated with a shower. The first heat pump assembly and the first evaporator are arranged in the cold water tank, and the first condenser is arranged in the hot water storage container; the second evaporator is arranged above the shower so as to absorb gas waste heat, and the second condenser is arranged in the hot water storage container. Waste water waste heat and waste gas waste heat can be fully utilized.

Description

Technical Field

[0001] The present application relates to the technical field of heat pump equipment, and in particular to a waste heat utilization heat pump hot water system. Background Art

[0002] For shower water, due to the large number of users and wide range, energy consumption accounts for a considerable proportion of domestic hot water. Waste heat recovery and reuse is conducive to reducing carbon emissions, reducing consumption, reducing costs and increasing efficiency. It has significant economic value and is worthy of promotion and application.

[0003] At present, there are more and more studies on the utilization of waste heat of shower water, such as the patented technical solution (application number 201520325491.7, the name of the invention is a hot water system that pumps out heat, cools it down, and then exchanges heat with waste water). This patented technical solution adopts the method of increasing the temperature difference between new water and waste water to increase the absorption of waste heat from waste water, thereby saving more energy. Specifically, the heat pump system absorbs the heat of cold water, which can be supplied by tap water, so that the cold water is cooled and then exchanges heat with waste water in a wall-type manner, and then the heat pump system heats the new water after heat exchange with the absorbed heat. The beneficial effect is that the cold water absorbs more waste heat and waste water waste heat, thereby having higher energy efficiency. The significant advantage of the above patented technical solution is that: when the waste water does not need to enter the heat exchanger of the heat pump system, the waste heat of the waste water is better absorbed, and it has the characteristics of long life, less maintenance, and energy saving.

[0004] However, the above patented technical solution also has limitations, for example: 1. It only utilizes the waste heat of wastewater, and its heat is usually not self-sufficient and requires other auxiliary heat sources; 2. Heating can be continued when there is wastewater, and heating is forced to stop when there is no wastewater; therefore, not only does the energy-saving effect of this patented product need to be improved, but its promotion and application is also subject to many restrictions. Utility Model Content

[0005] The present application aims to solve at least one of the above-mentioned technical problems in the prior art to a certain extent. To this end, the present application provides a waste heat utilization heat pump hot water system, which can fully utilize the waste heat of waste water and the waste heat of waste gas from shower water, and the heating process will not be affected by waste water collection.

[0006] A waste heat utilization heat pump hot water system according to an embodiment of the present application includes a water supply component, the water supply component includes a cold water tank, a hot water storage container and a shower, the cold water tank is provided with a first cold water inlet for new water to be introduced, a first heat exchanger for exchanging heat with shower waste water is provided between the cold water tank and the hot water storage container, new water flows into the cold water tank from the first cold water inlet, and flows into the hot water storage container after absorbing the heat of the shower waste water through the first heat exchanger, the hot water storage container is provided with a hot water outlet directly or indirectly connected to the shower; a first heat pump component, the first heat pump component includes a first compressor, a first condenser, a first evaporator and a first throttling element forming a refrigerant cycle, the first evaporator is arranged inside the cold water tank, and the first condenser is arranged inside the hot water storage container; and a second heat pump component, the second heat pump component includes a second compressor, a second condenser, a second evaporator and a second throttling element forming a refrigerant cycle, the second evaporator is arranged above the shower to absorb gas waste heat, and the second condenser is arranged inside the hot water storage container.

[0007] In an optional or preferred embodiment, the first heat exchanger has a first heat exchange channel and a second heat exchange channel for mutual heat exchange, the first heat exchange channel has a first water inlet and a first water outlet for collecting and discharging shower waste water, respectively, and the second heat exchange channel has a second water inlet connected to the cold water tank and a second water outlet connected to the inside of the hot water storage container. Further, the first heat exchanger is a partition heat exchanger, the new water introduced into the cold water tank absorbs heat through the first evaporator to form ice water, and the ice water in the cold water tank exchanges heat with the waste water flowing through the first heat exchange channel through the second heat exchange channel.

[0008] In an optional or preferred embodiment, a mixing water valve is provided between the hot water storage container and the shower, the mixing water valve having a hot water inlet for connecting to the hot water storage container, a second cold water inlet for introducing new water, and a mixing water outlet for connecting to the shower.

[0009] In an optional or preferred embodiment, an auxiliary heater for heating the hot water flowing therethrough is provided between the hot water storage container and the shower.

[0010] Another improvement is that a second heat exchanger is also arranged above the shower, and the two ends of the second heat exchanger are connected to the cold water tank through a circulating water inlet pipe and a circulating water outlet pipe respectively to form a circulating water heating system, so that the water in the cold water tank is continuously heated by the second heat exchanger, and the circulating water inlet pipe is provided with a circulating water pump. Furthermore, a fan is arranged above the shower to discharge the exhaust gas from the shower room and form an exhaust air duct for the exhaust gas, and the second evaporator and the second heat exchanger are arranged in the exhaust air duct. Furthermore, the second heat exchanger is located above the shower, the second evaporator is located above the second heat exchanger, and the fan is located above the second evaporator.

[0011] Another improvement is that the waste heat utilization heat pump hot water system also includes a third heat pump component, the third heat pump component includes a third compressor, a third condenser, a third heat exchanger and a third throttling element that form a refrigerant cycle, the third condenser is arranged inside the hot water storage container, and the third heat exchanger is used to exchange heat with shower waste water. Further, the third heat exchanger is a partition wall heat exchanger, the third heat exchanger has a third heat exchange channel and a fourth heat exchange channel that exchange heat with each other, the third heat exchange channel has a third water inlet and a third water outlet, the third water inlet is connected to the first water outlet to receive the shower waste water discharged from the first heat exchange channel and discharge it through the third water outlet, and the two ends of the fourth heat exchange channel are respectively connected to the third compressor and the third throttling element.

[0012] Based on the above technical solution, the embodiment of the present application has at least the following beneficial effects: the above technical solution sets two sets of heat pump components, namely the first heat pump component and the second heat pump component, the first condenser of the first heat pump component and the second condenser of the second heat pump component are both arranged in the hot water storage container, and can be used to heat the water in the hot water storage container; wherein, the water in the cold water tank flows to the hot water storage container after passing through the first heat exchanger, and can absorb the heat of the shower waste water through the first heat exchanger during use; the second evaporator of the second heat pump component is arranged above the shower, and can utilize the waste heat of the exhaust gas discharged during use and the heat in the air, and the exhaust gas is the water vapor generated during use. In the absence of waste water and exhaust gas, the second heat pump component can still utilize the heat in the air to continuously heat new water as needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present application is further described below with reference to the accompanying drawings and embodiments;

[0014] Figure 1 It is a structural schematic diagram of Embodiment 1 of the present application;

[0015] Figure 2 It is a structural diagram of Embodiment 2 of the present application;

[0016] Figure 3 It is a structural diagram of Embodiment 3 of the present application;

[0017] Figure 4 It is a structural diagram of embodiment 4 of the present application.

[0018] Reference numerals: first heat pump assembly 10, first compressor 11, first condenser 12, first evaporator 13, first throttling element 14;

[0019] A second heat pump assembly 20, a second compressor 21, a second condenser 22, a second evaporator 23, and a second throttling element 24;

[0020] Water supply assembly 30, cold water tank 31, drain valve 32, first heat exchanger 33, hot water storage container 34, mixing valve 35, shower 36, auxiliary heater 37, fan 38;

[0021] A second heat exchanger 41, a circulating water pump 42;

[0022] A third heat pump assembly 50 , a third compressor 51 , a third condenser 52 , a third heat exchanger 53 , and a third throttling element 54 . DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0024] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0029] Refer to the following Figures 1 to 4 , describes a waste heat utilization heat pump hot water system, and specifically presents four embodiments.

[0030] Embodiment 1

[0031] Refer to the following Figure 1 , describing a waste heat utilization heat pump hot water system, including a first heat pump component 10, a second heat pump component 20 and a water supply component 30.

[0032] In this embodiment, two sets of heat pump components are provided, namely, a first heat pump component 10 and a second heat pump component 20. The first heat pump component 10 includes a first compressor 11, a first condenser 12, a first evaporator 13 and a first throttling element 14 forming a refrigerant cycle. The second heat pump component 20 includes a second compressor 21, a second condenser 22, a second evaporator 23 and a second throttling element 24 forming a refrigerant cycle.

[0033] The water supply assembly 30 includes a cold water tank 31, a hot water storage container 34 and a shower 36. The cold water tank 31 is provided with a first cold water inlet for new water to be introduced. A first heat exchanger 33 for exchanging heat with shower waste water is provided between the cold water tank 31 and the hot water storage container 34. New water flows into the cold water tank 31 from the first cold water inlet, and flows into the hot water storage container 34 after absorbing the heat of the shower waste water through the first heat exchanger 33. The hot water storage container 34 is provided with a hot water outlet directly or indirectly connected to the shower 36.

[0034] In this embodiment, two sets of heat pump components are provided, namely, a first heat pump component 10 and a second heat pump component, a first condenser 12 is provided inside the hot water storage container 34, and a second condenser 22 is provided inside the hot water storage container 34. Both the first condenser 12 and the second condenser 22 are provided in the hot water storage container 34, and can be used to heat the water in the hot water storage container 34, and the first condenser 12 and the second condenser 22 are independent of each other.

[0035] The working principle of the heat pump assembly is a prior art, and those skilled in the art can refer to relevant materials for understanding, so it will not be repeated here. Taking the first heat pump assembly 10 as an example, its operation process is described, specifically: the refrigerant is driven by the first compressor 11, and flows through the first condenser 12, the first throttling element 14, and the first evaporator 13 in sequence, and then returns to the first compressor 11, and the first throttling element 14 adopts an expansion valve. After being sucked into the first compressor 11, the refrigerant is compressed into a high-temperature and high-pressure airflow. When the airflow flows through the first condenser 12, it releases heat to gradually cool down the new water that needs to be heated, and then it is throttled to become a low-pressure and low-temperature refrigerant when it flows through the expansion valve, and then enters the first evaporator 13 to absorb the heat of the water and gradually heat up and undergo a phase change. The vaporized refrigerant is sucked into the first compressor 11 again to form a continuous cycle. The operation process of the second heat pump assembly 20 can be understood with reference to the first heat pump assembly 10.

[0036] Reference Figure 1, the working principle of the waste heat utilization of exhaust gas in this embodiment is explained. The second evaporator 23 is arranged above the shower 36 to absorb the waste heat of gas. The shower is usually installed on the upper part of the shower room. During use, the shower room will generate a large amount of exhaust gas. The exhaust gas is the water vapor generated. The water vapor generated during the use process has not only sensible heat, but also huge latent heat. Among them, the exhaust gas above the shower is the most dense. Therefore, the second evaporator 23 is arranged above the shower 36. When the second heat pump assembly 20 is running, heat can be absorbed through the second evaporator 23 to improve the heating effect of the second condenser 22. In this way, the waste heat of the exhaust gas discharged during use and the heat in the air can be fully utilized.

[0037] Specifically, the first heat exchanger 33 has a first heat exchange channel and a second heat exchange channel for exchanging heat with each other, the first heat exchange channel has a first water inlet and a first water outlet for collecting and discharging shower waste water, respectively, and the second heat exchange channel has a second water inlet connected to the cold water tank 31 and a second water outlet connected to the inside of the hot water storage container 34. Further, the first heat exchanger 33 is a partition wall heat exchanger.

[0038] Reference Figure 1 , the working principle of wastewater waste heat utilization in this embodiment is explained. The first evaporator 13 is arranged inside the cold water tank 31. After the new water is introduced into the cold water tank 31, the new water absorbs heat through the first evaporator 13 to form ice water. It should be noted that the ice water referred to in this application does not specifically refer to an ice-water mixture, but refers to water with a temperature lower than that of the new water at room temperature. In this embodiment, the new water that absorbs heat through the first evaporator 13 should usually not be lower than 2°C.

[0039] Then, the ice water in the cold water tank 31 flows through the first heat exchanger 33 to utilize the waste heat of the waste water. Specifically, the ice water in the cold water tank 31 exchanges heat with the waste water flowing through the first heat exchange channel through the second heat exchange channel. The new water absorbs the waste heat of the waste water and heats up rapidly. Then, it enters the hot water storage container 34, is heated by the first condenser 12 and the second condenser 22, and is mixed with the hot water in the hot water storage container 34 for continuous use by users. It can be understood that the new water first passes through the first evaporator 12 to absorb heat and cool down, which increases the temperature difference with the waste water and improves the heat exchange effect of the first heat exchanger 33. The waste water does not need to enter the condenser or evaporator of the heat pump assembly, and the waste heat can be recycled to the greatest extent.

[0040] By utilizing the waste heat of the waste water through the first heat exchanger, the above two sets of heat pump components can also operate in a non-use state, the water temperature in the cold water tank becomes lower and lower, and the water temperature in the hot water storage container becomes higher and higher.

[0041] Preferably, the cold water tank 31 is provided with a drain valve 32 to prevent the water pressure in the cold water tank 31 from being too high.

[0042] The waste heat utilization heat pump hot water system of this embodiment can utilize the heat of water vapor in the air. In addition, the waste heat utilization of waste water makes the waste heat utilization more sufficient, and can usually achieve a continuous supply of hot water. When used for the first time or in the absence of waste water, the heat in the air can be used to continuously heat new water by relying solely on the second heat pump component. In addition, both the cold water tank and the hot water storage container have a certain amount of water storage. When hot water is not used, the first heat pump component can still operate normally, absorbing the heat of the water in the cold water tank through the first evaporator, and heating the water in the hot water storage container through the first condenser.

[0043] Compared with the traditional technology, the waste heat utilization heat pump hot water system of this embodiment eliminates the supply of auxiliary heat source, the system is more energy-efficient, has a smaller power load, and has a wider range of applications.

[0044] In use, a water mixing valve 35 is provided between the hot water storage container 34 and the shower 36 , and the water mixing valve 35 has a hot water inlet for connecting to the hot water storage container 34 , a second cold water inlet for introducing new water, and a water mixing outlet for connecting to the shower 36 .

[0045] In addition, in some embodiments, an auxiliary heater 37 for heating the hot water flowing therethrough is provided between the hot water storage container 34 and the shower 36 . Specifically, the auxiliary heater 37 is provided between the hot water storage container 34 and the mixing valve 35 , and can further heat the water out of the hot water storage container 34 .

[0046] Embodiment 2

[0047] Refer to the following Figure 2 , describes a waste heat utilization heat pump hot water system, the difference between this embodiment and the first embodiment is that: a second heat exchanger 41 is further arranged above the shower 36, and both ends of the second heat exchanger 41 are connected to the cold water tank 31 through a circulating water inlet pipe and a circulating water outlet pipe respectively, so as to form a circulating water heating system, so that the water in the cold water tank 31 is continuously heated by the second heat exchanger 41. Among them, the circulating water inlet pipe is provided with a circulating water pump 42.

[0048] Specifically, a fan 38 is arranged above the shower 36 to discharge the exhaust gas from the shower room and form an exhaust air duct for the exhaust gas. The second evaporator 23 is arranged in the exhaust air duct, and the second heat exchanger 41 is also arranged in the exhaust air duct. Figure 2 Specifically, the second heat exchanger 41 is located above the shower 36 , the second evaporator 23 is located above the second heat exchanger 41 , and the fan 38 is located above the second evaporator 23 .

[0049] In the circulating water heating system, under the action of the circulating water pump 42, the ice water in the cold water tank 31 flows through the second heat exchanger 41 to exchange heat with the exhaust gas, and the ice water flows back to the cold water tank 31 after being heated up. The circulating water heating system uses the cooled ice water to absorb the sensible heat of water vapor and the sensible heat of air through the second heat exchanger 41, continuously heats the ice water, and further improves the working efficiency of the first heat pump assembly 10.

[0050] Embodiment 3

[0051] Refer to the following Figure 3 , describing a waste heat utilization heat pump hot water system, the difference between this embodiment and the first embodiment is that the waste heat utilization heat pump hot water system also includes a third heat pump component 50. The third heat pump component 50 includes a third compressor 51, a third condenser 52, a third heat exchanger 53 and a third throttling element 54 that form a refrigerant cycle. The third condenser 52 is arranged inside the hot water storage container 34, and the third heat exchanger 53 is used to exchange heat with shower waste water. It can be understood that the heat of the shower waste water is absorbed by the third heat exchanger 53. When the third heat pump component 50 is in operation, the heat of the shower waste water is absorbed by the third heat exchanger 53, thereby improving the heating effect of the third condenser 52.

[0052] Specifically, the third heat exchanger 53 is a partition-type heat exchanger, and the third heat exchanger 53 has a third heat exchange channel and a fourth heat exchange channel for mutual heat exchange, and the third heat exchange channel has a third water inlet and a third water outlet, and the third water inlet is connected with the first water outlet to receive the shower waste water discharged from the first heat exchange channel and discharge it through the third water outlet, and the two ends of the fourth heat exchange channel are respectively connected with the third compressor 51 and the third throttling element 54. It can be understood that the third heat exchange channel of the third heat exchanger 53 is connected with the first heat exchange channel of the first heat exchanger 33, and the shower waste water still has residual heat after absorbing heat through the first heat exchanger 33. Through the continued heat absorption of the third heat exchanger 53, the heat of the shower waste water discharged during use can be further utilized.

[0053] The working mechanism of the third heat pump unit 50 can be understood with reference to the first heat pump unit 10 described above, except that the evaporator is replaced by a partitioning heat exchanger.

[0054] Embodiment 4

[0055] Refer to the following Figure 4 , describes a waste heat utilization heat pump hot water system. This embodiment uses the same circulating water heating system as the second embodiment. Under the action of the circulating water pump 42, the ice water in the cold water tank 31 flows through the second heat exchanger 41 to exchange heat with the exhaust gas, and the ice water flows back to the cold water tank 31 after heating. The circulating water heating system uses the cooled ice water to absorb the sensible heat of water vapor and the sensible heat of air through the second heat exchanger 41, continuously heats the ice water, and further improves the working efficiency of the first heat pump assembly 10.

[0056] The difference between this embodiment and the second embodiment is that the waste heat utilization heat pump hot water system also includes a third heat pump component 50. The third heat pump component 50 includes a third compressor 51, a third condenser 52, a third heat exchanger 53 and a third throttling element 54 that form a refrigerant cycle. The third condenser 52 is arranged inside the hot water storage container 34, and the third heat exchanger 53 is used to exchange heat with shower waste water. Specifically, the third heat exchanger 53 is a partition wall heat exchanger. The third heat exchanger 53 has a third heat exchange channel and a fourth heat exchange channel that exchange heat with each other. The third heat exchange channel has a third water inlet and a third water outlet. The third water inlet is connected to the first water outlet to receive the shower waste water discharged from the first heat exchange channel and discharge it through the third water outlet. The two ends of the fourth heat exchange channel are respectively connected to the third compressor 51 and the third throttling element 54.

[0057] It can be understood that, compared with the second embodiment, the fourth embodiment not only adopts a circulating water heating system, but also adds a third heat pump assembly 50. The third heat exchange channel of the third heat exchanger 53 is connected to the first heat exchange channel of the first heat exchanger 33. After the shower waste water absorbs heat through the first heat exchanger 33, there is still residual heat. Through the continued heat absorption of the third heat exchanger 53, when the third heat pump assembly 50 is running, the heat of the shower waste water is absorbed by the third heat exchanger 53, thereby improving the heating effect of the third condenser 52.

[0058] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present application.

Claims

1. A waste heat utilization heat pump hot water system, characterized in that: include A water supply component, the water supply component comprising a cold water tank, a hot water storage container and a shower, the cold water tank being provided with a first cold water inlet for introducing new water, a first heat exchanger for exchanging heat with shower waste water being provided between the cold water tank and the hot water storage container, new water flowing into the cold water tank from the first cold water inlet, and flowing into the hot water storage container after absorbing heat of the shower waste water through the first heat exchanger, the hot water storage container being provided with a hot water outlet directly or indirectly connected to the shower; a first heat pump assembly, the first heat pump assembly comprising a first compressor, a first condenser, a first evaporator and a first throttling element for forming a refrigerant cycle, the first evaporator being arranged inside the cold water tank, and the first condenser being arranged inside the hot water storage container; as well as The second heat pump component includes a second compressor, a second condenser, a second evaporator and a second throttling element that form a refrigerant cycle. The second evaporator is arranged above the shower to absorb waste heat of the gas. The second condenser is arranged inside the hot water storage container.

2. The waste heat utilization heat pump hot water system according to claim 1, characterized in that: The first heat exchanger comprises a first heat exchange channel and a second heat exchange channel for exchanging heat with each other, the first heat exchange channel comprises a first water inlet and a first water outlet for collecting and discharging shower waste water respectively, and the second heat exchange channel comprises a second water inlet connected to the cold water tank and a second water outlet connected to the inside of the hot water storage container.

3. The waste heat utilization heat pump hot water system according to claim 2, characterized in that: The first heat exchanger is a partition-type heat exchanger. The new water introduced into the cold water tank absorbs heat through the first evaporator to form ice water. The ice water in the cold water tank exchanges heat with the waste water flowing through the first heat exchange channel through the second heat exchange channel.

4. The waste heat utilization heat pump hot water system according to claim 2 or 3, characterized in that: A second heat exchanger is also arranged above the shower, and both ends of the second heat exchanger are connected to the cold water tank through a circulating water inlet pipe and a circulating water outlet pipe respectively to form a circulating water heating system, so that the water in the cold water tank is continuously heated by the second heat exchanger, and the circulating water inlet pipe is provided with a circulating water pump.

5. The waste heat utilization heat pump hot water system according to claim 4, characterized in that: A fan is arranged above the shower to discharge the waste gas from the shower room and form a waste gas discharge duct, and the second evaporator and the second heat exchanger are arranged in the discharge duct.

6. The waste heat utilization heat pump hot water system according to claim 5, characterized in that: The second heat exchanger is located above the shower, the second evaporator is located above the second heat exchanger, and the fan is located above the second evaporator.

7. The waste heat utilization heat pump hot water system according to claim 2 or 3, characterized in that: The waste heat utilization heat pump hot water system also includes a third heat pump component, which includes a third compressor, a third condenser, a third heat exchanger and a third throttling element that form a refrigerant circulation. The third condenser is arranged inside the hot water storage container, and the third heat exchanger is used to exchange heat with shower waste water.

8. The waste heat utilization heat pump hot water system according to claim 7, characterized in that: The third heat exchanger is a partition-type heat exchanger, and has a third heat exchange channel and a fourth heat exchange channel for exchanging heat with each other. The third heat exchange channel has a third water inlet and a third water outlet. The third water inlet is connected to the first water outlet to receive shower waste water discharged from the first heat exchange channel and discharge it through the third water outlet. Both ends of the fourth heat exchange channel are respectively connected to the third compressor and the third throttling element.

9. The waste heat utilization heat pump hot water system according to claim 1, characterized in that: A water mixing valve is arranged between the hot water storage container and the shower, and the water mixing valve has a hot water inlet for communicating with the hot water storage container, a second cold water inlet for introducing new water, and a water mixing outlet for communicating with the shower.

10. The waste heat utilization heat pump hot water system according to claim 1, characterized in that: An auxiliary heater for heating the hot water flowing therethrough is arranged between the hot water storage container and the shower.

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