Heat exchange system and heating equipment

Abstract

The utility model belongs to the technical field of household appliances, and particularly relates to a heat exchange system and heating equipment.The heat exchange system comprises a preheating device, the preheating device is arranged in a machine body of a heating stove, the preheating device communicates with a water supply end, and the preheating device is used for absorbing smoke heat in a smoke exhaust pipe of the heating stove; water output by the water supply end is preheated; the preheating device is arranged in the machine body, the heating device is arranged in the machine body, the preheating device, the heating device and the heat dissipation tail end of the heating furnace are communicated, and the heating device is used for absorbing heat generated by a combustion system of the heating furnace so as to heat water preheated by the preheating device; heated water is driven to circulate among the heat dissipation tail end, the heating device and the preheating device; according to the heat exchange system and the heating equipment, the heat efficiency of a heating furnace is improved.

Description

Technical Field

[0001] This application belongs to the field of household appliance technology, specifically relating to a heat exchange system and heating equipment. Background Technology

[0002] A gas-fired boiler is a household appliance that uses the heat generated by burning gas to heat water, and then uses the heated water as a heat source to transfer heat to the room in conjunction with underfloor heating to achieve winter heating.

[0003] The heat exchange system of the gas-fired boiler in the relevant technology includes a plate heat exchanger, which has a heating water inlet and a heating water outlet. Heating water is input through the heating water inlet, flows through the plate heat exchanger, and is output through the heating water outlet. The plate heat exchanger exchanges heat with the gas combustion system to heat the heating water flowing through the plate heat exchanger, so that the heating water flows through the underfloor heating system to heat the room.

[0004] However, after the heating water is radiated through the underfloor heating system, its temperature drops. In order to maintain the required indoor temperature, the combustion system needs to consume more gas to reheat the cooled heating water, which leads to a decrease in the thermal efficiency of the boiler. Utility Model Content

[0005] This application provides a heat exchange system and heating equipment to solve the technical problem in related technologies that heating water needs to consume more gas to reheat after dissipation, resulting in a decrease in the thermal efficiency of the heating boiler.

[0006] In a first aspect, this application provides a heat exchange system, comprising:

[0007] A preheating device is installed inside the heating furnace and is connected to the water supply end. The preheating device is used to absorb the heat of the flue gas in the flue pipe of the heating furnace to preheat the water output from the water supply end.

[0008] A heating device is provided inside the machine body. The preheating device, the heating device and the heat dissipation terminal of the heating furnace are connected. The heating device is used to absorb the heat generated by the combustion system of the heating furnace to heat the water preheated by the preheating device and drive the heated water to circulate between the heat dissipation terminal, the heating device and the preheating device.

[0009] In some embodiments, a water heating device is also included, which is disposed in the machine body. The preheating device, the water heating device and the water terminal are connected. The water heating device is used to absorb the heat generated by the combustion system to heat the water preheated by the preheating device and deliver the heated water to the water terminal.

[0010] In some embodiments, the preheating device includes a condenser having a water supply end and a first heating water outlet end, the water supply end being connected to the water supply end, and the first heating water outlet end being connected to the heating device.

[0011] In some embodiments, the heating device includes:

[0012] A heat exchanger having a second heating water outlet, a first heating water outlet connected to the heat exchanger, and a second heating water outlet connected to the inlet of the heat dissipation terminal. The heat exchanger is used to absorb the heat generated by the combustion system to heat the water preheated by the preheating device.

[0013] The condenser also has a heating water inlet, and the circulation mechanism is disposed on the heating water inlet. The heating water inlet is used to communicate with the outlet of the heat dissipation terminal. The circulation mechanism is used to drive the water heated by the heat exchanger to circulate between the heat dissipation terminal, the heat exchanger and the preheating device.

[0014] In some embodiments, the water heating device includes a gas heat exchanger having a domestic water inlet and a domestic water outlet. The domestic water inlet is used to communicate with the preheating device, and the domestic water outlet is used to communicate with the water outlet.

[0015] In some embodiments, the system further includes an inlet valve, which has an inlet channel and an outlet channel. One end of the inlet channel is connected to the water supply end, and the other end of the inlet channel is connected to the preheating device. One end of the outlet channel is connected to the preheating device, and the other end of the outlet channel is connected to the water heating device. The inlet channel is used to exchange heat with the outlet channel to heat the water in the inlet channel.

[0016] In some embodiments, the device further includes a valve body having a first inlet end and a first outlet end, the first inlet end being used to communicate with the heating device, and the first outlet end being used to communicate with the inlet end of the heat dissipation terminal.

[0017] In some embodiments, the valve body further has a second water outlet for communicating with the water heating device.

[0018] In some embodiments, a water flow detection device is also included, which is used to detect the water flow status at the water supply end and to turn the water heating device on or off when the water supply is started or stopped at the water supply end.

[0019] Secondly, this application provides a heating device, including a heat exchange system disposed on the body.

[0020] This application provides a heat exchange system and heating equipment. The heat exchange system provided by this application adopts a preheating device, which can use the heat of flue gas in the flue pipe of the heating furnace to preheat water. The preheated water can enter the heating device, so that the heating device can use the heat generated by the combustion system of the heating furnace to heat the water and transport the heated water to the heat dissipation terminal. Since the water entering the heating device has a certain temperature after being preheated by the preheating device, the heating time and gas consumption when heating the water to the same temperature are reduced, thereby indirectly improving the thermal efficiency of the heating furnace. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0022] Figure 1 This is a schematic diagram of the structure of a heat exchange system provided in an embodiment of this application.

[0023] Explanation of reference numerals in the attached drawings: 100, preheating device; 110, water supply end; 120, first heating water outlet; 130, heating water inlet; 200, heating device; 210, heat exchanger; 211, second heating water outlet; 220, circulation mechanism; 300, water heating device; 310, domestic water inlet; 320, domestic water outlet; 330, third outlet; 400, inlet valve; 410, inlet channel; 420, outlet channel; 430, valve body; 510, first inlet; 520, first outlet; 530, second outlet; 600, water flow detection device; 700, temperature detection device; 800, water supply end; 810, water usage terminal; 900, heat dissipation terminal.

[0024] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] The heat exchange system of the gas-fired boiler in the relevant technology includes a plate heat exchanger, which has a heating water inlet and a heating water outlet. Heating water is input through the heating water inlet, flows through the plate heat exchanger, and is output through the heating water outlet. The plate heat exchanger exchanges heat with the gas combustion system to heat the heating water flowing through the plate heat exchanger, so that the heating water flows through the underfloor heating system to heat the room.

[0027] However, after the heating water is radiated through the underfloor heating system, its temperature drops. In order to maintain the required indoor temperature, the combustion system needs to consume more gas to reheat the cooled heating water, which leads to a decrease in the thermal efficiency of the boiler.

[0028] To address the aforementioned technical problems, this application provides a heat exchange system and heating equipment. When hot water needs to be supplied to the heat dissipation terminals, the heating water circulates through a circulation mechanism between the condenser, heat exchanger, and heat dissipation terminals. As the heating water passes through the condenser, it utilizes the heat from the flue gas in the exhaust pipe to preheat the water. The preheated water then enters the heat exchanger, where it utilizes the heat from the boiler combustion system to further heat the water. This heated water is then transported to the heat dissipation terminals. Because the water entering the heat exchanger already has a certain temperature after preheating in the condenser, the need for the heat exchanger to heat the water to a lower temperature is reduced. The heating time and gas consumption at a given temperature are reduced, thus indirectly improving the thermal efficiency of the heating boiler. When users use the water terminal, the water supply can supply water to the condenser, allowing the water to be preheated through the condenser. The preheated water can then directly enter the gas heat exchanger, where it uses the heat from the combustion system to heat the water. The heated water can then be discharged through the domestic water outlet, making it convenient for users to use hot water. Because the water entering the gas heat exchanger already has a certain temperature after being preheated by the condenser, the heating time and gas consumption required for the gas heat exchanger to heat the water to the same temperature are reduced, thereby indirectly improving the thermal efficiency of the heating boiler.

[0029] The technical solutions of this application and how they solve the aforementioned technical problems are described in detail below with specific embodiments. These specific embodiments may exist independently or in combination with each other. Identical or similar concepts or processes may not be repeated in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0030] like Figure 1 As shown, a heat exchange system includes:

[0031] The preheating device 100 is installed inside the heating furnace and is connected to the water supply end 800. The preheating device 100 is used to absorb the heat of the flue gas in the flue pipe of the heating furnace to preheat the water output from the water supply end 800.

[0032] A heating device 200 is installed inside the unit. The preheating device 100, the heating device 200, and the heat dissipation terminal 900 of the heating furnace are connected. The heating device 200 absorbs heat generated by the combustion system of the heating furnace to heat the water preheated by the preheating device 100, and drives the heated water to circulate between the heat dissipation terminal 900 of the heating furnace, the heating device 200, and the preheating device 100. In this embodiment, the heat dissipation terminal 900 is configured as underfloor heating or a radiator.

[0033] In this application, by employing a preheating device 100, the preheating device 100 can utilize the heat from the flue gas in the exhaust pipe of the heating boiler to preheat the water. The preheated water can then enter the heating device 200, allowing the heating device 200 to utilize the heat generated by the combustion system of the heating boiler to heat the water. The heated water is then transported to the heat dissipation terminal 900. Since the water entering the heating device 200 already has a certain temperature after being preheated by the preheating device 100, the heating time and gas consumption required for the heating device 200 to heat the water to the same temperature are reduced, thereby indirectly improving the thermal efficiency of the heating boiler.

[0034] The heat exchange system also includes a water heating device 300, which is installed inside the machine body. The preheating device 100, the water heating device 300, and the water terminal 810 are connected. The water heating device 300 is used to absorb the heat generated by the combustion system to heat the water preheated by the preheating device 100 and deliver the heated water to the water terminal 810.

[0035] In this embodiment, the water-using terminal 810 can be a shower head or a bathroom cabinet faucet, etc.

[0036] In this application, when a user needs hot water, the preheating device 100 can also use the heat from the flue gas in the exhaust pipe to preheat the water. The preheated water can then enter the water heating device 300, which uses the heat generated by the combustion system to heat the water preheated by the preheating device 100. The heated water is then delivered to the water terminal 810. Since the water entering the water heating device 300 already has a certain temperature after being preheated by the preheating device 100, the heating time and gas consumption when the water heating device 300 heats the water to the same temperature are reduced, thereby indirectly improving the thermal efficiency of the heating boiler. Furthermore, by separating domestic water and heating water, the same heating boiler can simultaneously provide heating and domestic water, indirectly improving the applicability of the heating boiler.

[0037] like Figure 1 As shown, the preheating device 100 includes a condenser, which has a water supply end 110 and a first heating water outlet end 120. The water supply end 110 is used to communicate with the water supply end 800, and the first heating water outlet end 120 is communicated with the heating device 200.

[0038] In this embodiment, the water supply end 110 can receive tap water output from the water supply end 800.

[0039] In this application, by employing a condenser, water output from the water supply end 800 can enter the condenser along the water delivery end 110. The condenser heats the water by exchanging heat with the flue gas, so that the heated water is output along the first heating water outlet end 120. The condenser setup is simple in structure and improves the utilization efficiency of flue gas heat by directly exchanging heat with the flue gas. By recovering heat from the flue gas, the energy efficiency of the heating boiler can be significantly improved. By reducing the amount of fuel gas used in the combustion process, carbon emissions are reduced, making it more environmentally friendly. The use of the condenser can lower the exhaust gas temperature because more heat is transferred to the water, reducing heat loss. The condenser can not only recover the sensible heat in the flue gas, but also the latent heat released when water vapor condenses, further improving the energy efficiency of the heating boiler.

[0040] like Figure 1 As shown, the heating device 200 includes:

[0041] The heat exchanger 210 has a second heating water outlet 211. The first heating water outlet 120 is connected to the heat exchanger 210. The second heating water outlet 211 is used to connect to the inlet of the heat dissipation terminal 900. The heat exchanger 210 is used to absorb the heat generated by the combustion system to heat the water preheated by the preheating device 100.

[0042] The condenser also has a heating water inlet 130. The circulation mechanism 220 is set on the heating water inlet 130. The heating water inlet 130 is used to connect with the outlet of the heat exchange terminal 900. The circulation mechanism 220 is used to drive the water heated by the heat exchanger 210 to circulate between the heat exchange terminal 900, the heat exchanger 210 and the preheating device 100.

[0043] In this embodiment, the circulation mechanism 220 is configured as a water pump.

[0044] In this application, the water preheated by the condenser can enter the heat exchanger 210 along the first heating water outlet 120. The heat exchanger 210 uses the heat from the combustion of the combustion system to heat the preheated water, so that the heated water is output along the second heating water outlet 211. The condenser has a simple structure and improves the utilization efficiency of the heat during combustion by directly exchanging heat with the gas in the combustion system.

[0045] like Figure 1 As shown, the water heating device 300 includes a gas heat exchanger, which has a domestic water inlet 310 and a domestic water outlet 320. The domestic water inlet 310 is used to communicate with the preheating device 100, and the domestic water outlet 320 is used to communicate with the water terminal 810.

[0046] In this embodiment, the gas heat exchanger is a plate heat exchanger, and the domestic water inlet 310 is used to connect with the condenser.

[0047] In this application, the preheated water from the preheating device 100 can enter the plate heat exchanger along the domestic water inlet 310, and the heated water from the plate heat exchanger can be transported to the water outlet 810 along the domestic water outlet 320. The plate heat exchanger is a highly efficient, compact, and easy-to-maintain heat exchange device. It has a large heat exchange area, enabling efficient heat exchange within a small space. Due to its high heat exchange efficiency, the plate heat exchanger can be designed to be very compact, occupying little space, making it suitable for space-constrained applications. The plate heat exchanger has a simple structure, is easy to disassemble and clean, and is convenient for maintenance and repair. Different plate types and configurations can be selected as needed to adapt to different fluid and heat exchange requirements. Due to its large heat exchange area and narrow fluid channels, the plate heat exchanger responds quickly to temperature changes. The number of plates can be increased or decreased as needed to adapt to different heat loads. Due to its rapid response and high thermal efficiency, the plate heat exchanger can achieve precise temperature control by coordinating with the gas supply.

[0048] like Figure 1As shown, the heat exchange system also includes an inlet valve 400, which has an inlet channel 410 and an outlet channel 420. One end of the inlet channel 410 is connected to the water supply end 800, and the other end of the inlet channel 410 is connected to the preheating device 100. One end of the outlet channel 420 is connected to the preheating device 100, and the other end of the outlet channel 420 is connected to the water heating device 300. The inlet channel 410 is used to exchange heat with the outlet channel 420 to heat the water in the inlet channel 410.

[0049] In this embodiment, the other end of the water inlet channel 410 is connected to the water supply end 110 of the condenser, and the other end of the water outlet channel 420 is connected to the domestic water inlet end 310 of the gas heat exchanger, so that the water output from the water supply end 800 can enter the condenser along the water inlet channel 410 and the water supply end 110, thereby allowing the condenser to preheat the water. The preheated water then enters the gas heat exchanger for heating through the water outlet channel 420 and the domestic water inlet end 310.

[0050] In this application, the water output from the water supply end 800 can enter the water inlet valve 400 along one end of the water inlet channel 410 and enter the condenser along the other end of the water inlet channel 410, so that the condenser preheats the water. The preheated water can enter the water inlet valve 400 again along one end of the water outlet channel 420 and enter the water heating device 300 along the other end of the water outlet channel 420, so that the preheated water can preheat the water entering the water inlet channel 410 from the water supply end 800 in the water outlet channel 420. This allows the water entering the condenser to be heated through the water inlet valve 400, thereby enabling the condenser to use less flue gas heat and a shorter time to preheat the water, thus indirectly improving the condensing efficiency of the condenser.

[0051] like Figure 1 As shown, the heat exchange system also includes a valve body 500, which has a first inlet end 510 and a first outlet end 520. The first inlet end 510 is used to communicate with the heating device 200, and the first outlet end 520 is used to communicate with the inlet end of the heat dissipation terminal 900.

[0052] In this embodiment, the first water inlet 510 is connected to the second heating water outlet 211 of the heat exchanger 210.

[0053] In this application, by adopting the configuration of valve body 500, the valve body 500 can freely open and close the first water inlet end 510 and the first water outlet end 520. When the water heating device 300 is turned on, the first water outlet end 520 is closed to prevent water from being supplied to the heat dissipation terminal 900. When the heat dissipation terminal 900 is used, the first water outlet end 520 is opened to facilitate the supply of hot water to the heat dissipation terminal 900.

[0054] like Figure 1As shown, the valve body 500 also has a second outlet 530, which is used to communicate with the water heating device 300.

[0055] In this embodiment, the second water outlet 530 is connected to the gas heat exchanger; the gas heat exchanger also has a third water outlet 330, which is connected to a water pump, so that the water pump can drive water to circulate between the condenser, the heat exchanger 210 and the gas heat exchanger.

[0056] In this application, by adopting a second water outlet 530, and by opening the second water outlet 530 and closing the first water outlet 520, water heated by the heating device 200 can flow through the water heating device 300 and out through the domestic water outlet 320 of the water heating device 300. When the water supply is interrupted, the water in the heating device 200 can be used as domestic water. When the domestic water outlet 320 is closed, the water can circulate and be heated between the condenser, heat exchanger 210, and gas heat exchanger through the circulation mechanism 220. When the user uses the water terminal 810, the water is heated... Water can flow directly out through the domestic water outlet 320, thus realizing the zero-cold-water function of the heating boiler for domestic water and reducing the waste of water resources when users wait for hot water. Furthermore, by simultaneously opening the heat exchanger 210 and the gas heat exchanger, the condenser, heat exchanger 210 and gas heat exchanger can achieve stepped heating, thereby further improving the heating efficiency of the heating boiler for domestic water. Moreover, the domestic water heated multiple times by the heat exchanger 210 and the gas heat exchanger can be circulated to the water terminal 810 through the first inlet 510 and the first outlet 520, thereby indirectly improving the heating efficiency of the heat dissipation terminal 900.

[0057] like Figure 1 As shown, the heat exchange system also includes a water flow detection device 600, which is used to detect the water flow status of the water supply end 800 and to turn on or off the water heating device 300 when the water supply end 800 starts or stops supplying water.

[0058] In this embodiment, the water flow detection device 600 is configured as a water flow sensor, which is installed on the water supply end 800. When the user turns on the water terminal 810, the water supply end 800 can automatically start water supply due to the pressure in the pipeline. When the user turns off the water terminal 810, the water supply end 800 can automatically stop water supply.

[0059] In this application, by adopting the water flow detection device 600, when the user turns on the water terminal 810, the water supply terminal 800 can supply water to the condenser. When the water flow detection device 600 detects that the water supply terminal 800 has started supplying water, it can automatically turn on the water heating device 300, so that the water heating device 300 heats the domestic water without the need for manual operation of the water heating device 300, saving manpower and improving the automation level of the heating boiler.

[0060] like Figure 1 As shown, the heat exchange system also includes a temperature detection device 700, which is used to detect the inlet water temperature of the water supply end 800 and the outlet water temperature of the domestic water heated by the water heating device 300.

[0061] In this embodiment, the temperature detection device 700 is configured as a temperature sensor; there are two temperature sensors, which are respectively installed on the water supply end 800 and the domestic water outlet end 320. By detecting the inlet water temperature and the outlet water temperature through the temperature sensors, the inlet water temperature and the outlet water temperature can be displayed on the display screen of the heating boiler.

[0062] In this application, by monitoring the inlet and outlet water temperatures in real time, the operating status of the water heating device 300 can be precisely controlled to ensure that the domestic water meets the temperature requirements set by the user. By detecting the outlet water temperature, the risk of scalding due to excessive temperature can be prevented, improving safety. If the outlet water temperature is abnormal, potential problems with the water heating device 300 can be detected in time, facilitating timely repair and replacement and avoiding greater losses. Users can understand the operating status of the heating device based on the detection results of the inlet and outlet water temperatures, enhancing the user experience.

[0063] This application also provides a heating device, including a heat exchange system of any of the above embodiments with the body mounted on the body.

[0064] The specific structure of the heat exchange system has been described in detail in the above embodiments and will not be repeated here.

[0065] In this embodiment, the heating equipment is set as a heating furnace.

[0066] This application embodiment provides a heating device. By setting up a heat exchange system, when hot water needs to be supplied to the heat dissipation terminal 900, the heating water can circulate through the condenser, heat exchanger 210, and heat dissipation terminal 900 via the circulation mechanism 220. When the heating water passes through the condenser, the condenser can use the heat of the flue gas in the exhaust pipe to preheat the heating water. The preheated heating water can then enter the heat exchanger 210, where it can use the heat from the boiler combustion system to further heat the heating water. The heated heating water from the heat exchanger 210 can then be supplied to the heat dissipation terminal 900. Since the heating water entering the heat exchanger 210 already has a certain temperature after being preheated by the condenser, the heat exchanger 210's operating temperature is reduced. 10. The heating time and gas consumption when heating water to the same temperature are reduced, thereby indirectly improving the thermal efficiency of the heating boiler. When the user uses the water terminal 810, the water supply terminal 800 can supply water to the condenser, so that the water is preheated through the condenser. The preheated water can directly enter the gas heat exchanger, so that the gas heat exchanger uses the heat of the combustion system to heat the water. The water heated by the gas heat exchanger can be discharged along the domestic water outlet 320, thus facilitating the user's use of hot water. Since the water entering the gas heat exchanger has a certain temperature after being preheated by the condenser, the heating time and gas consumption when heating water to the same temperature by the gas heat exchanger are reduced, thereby indirectly improving the thermal efficiency of the heating boiler.

[0067] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A heat exchange system, characterized in that, include: A preheating device (100) is installed inside the boiler. The preheating device (100) is connected to the water supply end (800). The preheating device (100) is used to absorb the heat of the flue gas in the flue pipe of the boiler to preheat the water output from the water supply end (800). A heating device (200) is installed in the body of the machine. The preheating device (100), the heating device (200) and the heat dissipation terminal (900) of the heating furnace are connected. The heating device (200) is used to absorb the heat generated by the combustion system of the heating furnace to heat the water preheated by the preheating device (100) and drive the heated water to circulate between the heat dissipation terminal (900), the heating device (200) and the preheating device (100).

2. The heat exchange system according to claim 1, characterized in that, It also includes a water heating device (300) disposed in the machine body. The preheating device (100), the water heating device (300) and the water terminal (810) are connected. The water heating device (300) is used to absorb the heat generated by the combustion system to heat the water preheated by the preheating device (100) and deliver the heated water to the water terminal (810).

3. The heat exchange system according to claim 2, characterized in that, The preheating device (100) includes a condenser having a water supply end (110) and a first heating water outlet end (120). The water supply end (110) is used to communicate with the water supply end (800), and the first heating water outlet end (120) is communicated with the heating device (200).

4. The heat exchange system according to claim 3, characterized in that, The heating device (200) includes: A heat exchanger (210) has a second heating water outlet (211), a first heating water outlet (120) is connected to the heat exchanger (210), and the second heating water outlet (211) is connected to the inlet of the heat dissipation terminal (900). The heat exchanger (210) is used to absorb the heat generated by the combustion system to heat the water preheated by the preheating device (100). The condenser also has a heating water inlet (130), and the circulation mechanism (220) is disposed on the heating water inlet (130). The heating water inlet (130) is used to communicate with the outlet of the heat dissipation terminal (900). The circulation mechanism (220) is used to drive the water heated by the heat exchanger (210) to circulate between the heat dissipation terminal (900), the heat exchanger (210) and the preheating device (100).

5. The heat exchange system according to claim 2, characterized in that, The water heating device (300) includes a gas heat exchanger, which has a domestic water inlet (310) and a domestic water outlet (320). The domestic water inlet (310) is used to communicate with the preheating device (100), and the domestic water outlet (320) is used to communicate with the water terminal (810).

6. The heat exchange system according to any one of claims 2-5, characterized in that, It also includes an inlet valve (400), which has an inlet channel (410) and an outlet channel (420). One end of the inlet channel (410) is connected to the water supply end (800), and the other end of the inlet channel (410) is connected to the preheating device (100). One end of the outlet channel (420) is connected to the preheating device (100), and the other end of the outlet channel (420) is connected to the water heating device (300). The inlet channel (410) is used to exchange heat with the outlet channel (420) to heat the water in the inlet channel (410).

7. The heat exchange system according to any one of claims 2-5, characterized in that, It also includes a valve body (500), which has a first inlet end (510) and a first outlet end (520). The first inlet end (510) is used to communicate with the heating device (200), and the first outlet end (520) is used to communicate with the inlet end of the heat dissipation terminal (900).

8. The heat exchange system according to claim 7, characterized in that, The valve body (500) also has a second water outlet (530) for communicating with the water heating device (300).

9. The heat exchange system according to any one of claims 2-5, characterized in that, It also includes a water flow detection device (600), which is used to detect the water flow status of the water supply end (800) and to turn on or off the water heating device (300) when the water supply end (800) starts or stops supplying water.

10. A heating device, characterized in that, Includes a heat exchange system as described in any one of claims 1-9, mounted on the body.

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