Energy-saving type recovery system and method for waste heat of air conditioner

Abstract

The invention provides an air conditioner waste heat energy-saving type recovery system which comprises a water inlet pipeline, a heat recovery unit, a circulating pump, a heat storage water tank, a boiler and an air conditioner pipeline system, the water inlet pipeline is connected with a first valve and a second valve through a tee joint, and the other end of the first valve is connected with the water inlet end of the circulating pump; the heat exchange end of the heat recovery unit is connected with the water outlet end of the circulating pump and the water inlet end of the heat storage water tank, and the water outlet end of the heat storage water tank is connected with the water inlet end of the boiler through a third valve. When an air conditioner runs, a refrigerant in an air conditioner pipeline system flows through the heat exchange copper pipe in the heat recovery unit, waste heat is extracted, the extracted waste heat is transmitted to cold water through the copper pipe, the water temperature is gradually increased, and heated domestic water is stored in the heat storage water tank through a pipeline for daily use. Therefore, electric energy needed by heat dissipation of the air conditioner outdoor unit is reduced, and operation energy consumption of the air conditioner is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioner waste heat recovery, and in particular relates to an air conditioner waste heat energy-saving recovery system and method thereof. Background Art

[0002] With the rapid development of the global economy and the continuous improvement of people's living standards, energy demand continues to grow. Building energy consumption accounts for a significant proportion of all energy consumption, and air conditioning systems are a major component of this consumption. Heat transfer is primarily achieved through the phase change of the refrigerant. Its operating cycle consists of four steps: compression, condensation, throttling, and evaporation. During the evaporation process, liquid refrigerant absorbs heat from the indoor air in the evaporator and evaporates into a gas, thereby lowering the indoor air temperature and achieving a cooling effect. This heat absorbed from the indoor air is carried by the refrigerant and then drawn into and compressed by the compressor. The compressor consumes electrical energy to perform work on the refrigerant, raising its pressure and temperature. This increases the refrigerant's internal energy, converting the electrical energy into its internal energy. The high-temperature, high-pressure gaseous refrigerant enters the condenser, where it releases heat to the air. If this heat is not effectively utilized, it becomes waste heat.

[0003] During traditional air conditioning operation, a large amount of waste heat is directly discharged into the environment, resulting in significant energy waste and thermal pollution. Boilers, commonly used heating equipment in industrial production and daily life, consume significant amounts of energy to heat water or generate steam. Harnessing air conditioning waste heat to partially heat the boiler can significantly reduce the boiler's traditional energy consumption, improving the company's economic benefits, while also reducing pollutant emissions caused by energy consumption. Summary of the Invention

[0004] (1) Technical problems to be solved In view of the shortcomings of the existing technology, the purpose of the present invention is to provide an air-conditioning waste heat energy-saving recovery system and method, so as to solve the problem that a large amount of waste heat generated during the operation of the existing air conditioner is directly discharged into the environment, which not only causes a huge waste of energy but also causes thermal pollution to the environment.

[0005] (2) Technical solution In order to solve the above technical problems, the present invention provides an air-conditioning waste heat energy-saving recovery system, including a water inlet pipe, a heat recovery unit, a circulating pump, a heat storage tank, a boiler and an air-conditioning piping system, the water inlet pipe is connected to a first valve and a second valve through a tee, the other end of the first valve is connected to the water inlet end of the circulating pump, the heat exchange end of the heat recovery unit is respectively connected to the water outlet end of the circulating pump and the water inlet end of the heat storage tank, the water outlet end of the heat storage tank is connected to the water inlet end of the boiler through a third valve, the other end of the second valve is connected to the water inlet end of the boiler, the water outlet end of the heat storage tank is connected to the water inlet end of the circulating pump through a first one-way valve, and the high-temperature end of the heat recovery unit is connected in series to the outdoor heat dissipation end of the air-conditioning piping system.

[0006] Preferably, a control box is further included, wherein the first valve, the second valve and the third valve are all electric valves, and the first valve, the second valve and the third valve are all electrically connected to the control box, and the control box is connected to the controller of the air-conditioning pipeline system.

[0007] Preferably, a second one-way valve is installed between the first valve and the circulation pump, and the water outlet ends of the first one-way valve and the second one-way valve are connected through a three-way connection.

[0008] Preferably, a heat meter is installed between the heat storage tank and the third valve, a temperature sensor is installed between the second one-way valve and the first valve, the temperature sensor is electrically connected to the heat meter, and the heat meter is electrically connected to the control box.

[0009] Preferably, a fourth valve is installed between the heat storage tank and the first one-way valve, and a fifth valve is installed at the water inlet end of the heat storage tank.

[0010] Preferably, the heat meter is an ultrasonic heat energy meter, and a metal waterproof cover is installed on the outer surface of the heat meter, and the metal waterproof cover is waterproof on three sides.

[0011] Preferably, the configuration method of the air-conditioning waste heat energy-saving recovery system includes: Analyze the waste heat during cooling of the air conditioning piping system; Configure the air conditioning waste heat energy-saving recovery system and select the installation location based on the air conditioning waste heat; Construct an air conditioning waste heat energy-saving recovery system at the selected installation location.

[0012] Preferably, the method for constructing an air conditioning waste heat energy-saving recovery system includes: Step 1: Clean the construction site and build temporary construction facilities. Then set up safety protection facilities and warning signs, plan the construction site into zones, level the site with a laser level, and lay out the lines. Step 2: Use 8mm thick channel steel to weld into a 2m*0.5m dispersion frame at the installation location of the hot water storage tank, use No. 3 galvanized angle iron to build the support frame for the water pipe, and use No. 4 galvanized angle iron to build the support frame for the heat recovery unit; Step 3: Use cold water pipes and hot water pipes to connect the water inlet pipe, heat recovery unit, circulation pump, heat storage tank, boiler, first valve, second valve, third valve and first check valve. Then use copper pipes to connect the heat recovery unit and air conditioning piping system and fix them with pipe clamps. Secure them firmly with dovetail nails, and spray and insulate them. Step 4: After the construction is completed, mark the normally open valves and normally closed valves, install the control box and system APP to debug the equipment.

[0013] Preferably, the heat recovery unit includes a plurality of heat exchangers neatly installed on the same plane, and the water pipes and copper pipes of the heat recovery unit are well insulated.

[0014] An energy-saving method for recovering waste heat from air conditioners as described above includes the following modes: Heat recovery intelligent mode: When the air conditioner is turned on for cooling, the refrigerant in the air conditioning pipeline system begins to flow, and at the same time the second valve is closed, the first valve and the third valve are opened, and then the circulation pump is started. Since a circulation loop is formed between the circulation pump, the heat exchange end of the heat recovery unit, the heat storage tank and the first one-way valve, the heat carried by the refrigerant is transferred to the water flow at the heat exchange end through the heat recovery unit, thereby recovering the waste heat in the air conditioning pipeline system through the heat recovery unit, and storing the heat in the heat storage tank through the circulation pump. When the boiler uses hot water, tap water enters the boiler along the water inlet pipe, the first valve, the circulation pump, the heat recovery unit, the heat storage tank and the third valve. Since the heat recovery unit can use the waste heat in the air conditioning pipeline system to heat the tap water in the water inlet pipe, the heat energy discharged by the air conditioner is utilized, thereby reducing the energy consumption of the boiler for hot water production.

[0015] Traditional mode: When the air conditioner is not cooling, close the first valve and the third valve, open the second valve, and when the boiler uses hot water, tap water flows along the water inlet pipe and the second valve into the boiler, and hot water is used normally.

[0016] (3) Beneficial effects Compared with the prior art, the present invention has the following beneficial effects: In the above solution, when the air conditioner is not cooling, the first valve and the third valve are closed and the second valve is opened. When the boiler uses hot water, tap water enters the boiler along the water inlet pipe and the second valve, and hot water is used normally.

[0017] In the above solution, the hot water storage tank is connected to the heat recovery unit through pipes and a circulation pump. When the air conditioner is running, the heated domestic water is stored in the hot water storage tank. The built-in insulation layer effectively reduces heat loss and ensures that the water temperature remains within the set range for a long time.

[0018] In the above scheme, when the air conditioner is running, the refrigerant in the air conditioning piping system flows through the heat exchange copper tube in the heat recovery unit, and the waste heat is extracted. The extracted waste heat is transferred to the cold water through the copper tube, so that the water temperature gradually increases. The heated domestic water is stored in the heat storage tank through the pipe for daily use, thereby reducing the electricity required for the air conditioner outdoor unit to dissipate heat itself and improving the operating energy consumption of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the air conditioning piping system in series in the present invention; Figure 2 This is a schematic diagram of the heat storage structure when the air conditioner in the present invention is turned on for cooling; Figure 3 This is a schematic diagram of the structure of the boiler used when the air conditioner in the present invention is turned on for cooling; Figure 4 A schematic diagram of the structure of a boiler using a conventional mode in the present invention; The markings in the attached figure are: 1. Water inlet pipe; 2. Heat recovery unit; 3. Circulation pump; 4. Heat storage tank; 5. Boiler; 6. First valve; 7. Second valve; 8. Third valve; 9. First one-way valve; 10. Air-conditioning piping system; 11. Fifth valve; 12. Second one-way valve; 13. Heat meter; 14. Temperature sensor; 15. Fourth valve. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0021] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0022] like Figures 1-4 As shown, an embodiment of the present invention provides an air conditioning waste heat energy-saving recovery system, comprising a water inlet pipe 1, a heat recovery unit 2, a circulating pump 3, a hot water storage tank 4, a boiler 5 and an air conditioning piping system 10, the water inlet pipe 1 is connected to a first valve 6 and a second valve 7 through a tee, the other end of the first valve 6 is connected to the water inlet end of the circulating pump 3, the heat exchange end of the heat recovery unit 2 is connected to the water outlet end of the circulating pump 3 and the water inlet end of the hot water storage tank 4 respectively, the water outlet end of the hot water storage tank 4 is connected to the water inlet end of the boiler 5 through a third valve 8, and the other end of the second valve 7 is connected to the inlet end of the boiler 5. The water end is connected, the water outlet end of the hot water storage tank 4 is connected to the water inlet end of the circulation pump 3 through the first one-way valve 9. The hot water storage tank 4 is specially used to match the air-conditioning waste heat recovery device. The hot water storage tank 4 is designed to store domestic water heated by the waste heat recovery device. It has a built-in insulation layer to ensure the stability of the water temperature and improve energy utilization. The high-temperature end of the heat recovery unit 2 is connected in series with the outdoor heat dissipation end of the air-conditioning pipe system 10. The waste heat generated when the air-conditioning pipe system 10 is working will be introduced into the heat recovery unit 2, and the waste heat will be transferred to the domestic water through the built-in copper pipe to realize the recovery and utilization of heat energy.

[0023] In this embodiment, a control box is also included. The first valve 6, the second valve 7 and the third valve 8 are all electric valves. The first valve 6, the second valve 7 and the third valve 8 are all electrically connected to the control box. The control box is connected to the controller of the air-conditioning piping system 10. In this way, when the air conditioner is started, the waste heat recovery device will automatically start working. When the air conditioner stops, the recovery device will automatically stop. The domestic water temperature is adjusted by the intelligent control system in the control box to ensure comfort.

[0024] like Figure 1 and Figure 2 As shown, in this embodiment, a second one-way valve 12 is installed between the first valve 6 and the circulation pump 3, the water outlet ends of the first one-way valve 9 and the second one-way valve 12 are connected by a tee, a heat meter 13 is installed between the hot water storage tank 4 and the third valve 8, and a temperature sensor 14 is installed between the second one-way valve 12 and the first valve 6. The temperature sensor 14 is electrically connected to the heat meter 13, and the heat meter 13 is electrically connected to the control box; the temperature sensor 14 is installed in front of the second one-way valve 12 to prevent the hot water in the hot water storage tank 4 from circulating to the probe position of the temperature sensor 14 when the circulation pump 3 is running, thereby affecting the cold water temperature detection effect.

[0025] like Figure 2 and Figure 3 As shown, in this embodiment, a fourth valve 15 is installed between the hot water storage tank 4 and the first one-way valve 9 , and a fifth valve 11 is installed at the water inlet end of the hot water storage tank 4 .

[0026] like Figure 1 and Figure 2 As shown, in this embodiment, the heat meter 13 is an ultrasonic heat energy meter. A metal waterproof cover is installed on the outer surface of the heat meter 13. The metal waterproof cover is waterproof on three sides to ensure that the waterproof cover is neat and flat. The probe of the temperature sensor 14 is connected to the system main water inlet pipe 1 through a PPR temperature measuring pipe fitting. The probe line of the temperature sensor 14 needs to be smoothly tied to the pipeline with black tape.

[0027] In this embodiment, the configuration method of the recycling system includes: Analyze the waste heat of the air conditioning piping system 10 during cooling; Configure the energy-saving recovery system mentioned above and select the installation location based on the waste heat from air conditioning; Construct an air conditioning waste heat energy-saving recovery system at the selected installation location.

[0028] For example, when analyzing the air conditioning piping system 10 of a large commercial building, the waste heat may reach several megawatts or even higher. It is necessary to measure the temperature of the waste heat and configure the appropriate heat recovery unit 2 according to the different refrigeration systems; The capacity of the hot water storage tank 4 is configured based on the cooling capacity and waste heat recovery requirements of the air conditioning piping system 10. The appropriate capacity can be selected by calculating the amount of waste heat generated by the air conditioning piping system 10 over a certain period of time, combined with the hot water usage and storage time. For example, if the air conditioning piping system 10 generates a large amount of waste heat and the boiler 5 is used less, hot water will need to be stored for a long time, and a larger capacity hot water storage tank 4 should be selected. The flow rate of the circulating pump 3 should be configured based on the waste heat recovery capacity of the air conditioning piping system 10 and the water inlet and outlet requirements of the hot water storage tank 4. It is necessary to ensure that the circulating pump 3 can transport sufficient heat to the hot water storage tank 4 for storage per unit time, while also meeting the demand for hot water to be output from the hot water storage tank 4. The installation location of the above-mentioned air conditioning waste heat energy-saving recovery system is selected on the roof. This installation will not affect the overall aesthetics of the building. The rooftop is also open, facilitating subsequent maintenance and ensuring sufficient operating space.

[0029] Among them, the lines of the temperature sensor 14 and the circulating pump 3 must be routed through pipes, the temperature measuring probe of the temperature sensor 14 must be in complete contact with the measured medium, and the power, model, and range of the circulating pump 3 must be specific, for example, a range of 10 meters and a power of 260 watts are selected.

[0030] In this embodiment, the construction air conditioning waste heat energy-saving recovery system includes: Step 1: Clean the construction site and build temporary construction facilities. Then set up safety protection facilities and warning signs, plan the construction site into zones, level the site with a laser level, and lay out the lines. Step 2: Use 8mm thick channel steel to weld into a 2m*0.5m load-bearing frame at the installation location of the hot water storage tank 4. Then use No. 3 galvanized angle iron to build a support frame for the water pipe, and use No. 4 galvanized angle iron to build a support frame for the heat recovery unit 2. The load-bearing frame can share the load of each square meter of the terrace; Step 3: Use cold water pipes and hot water pipes to connect the water inlet pipe 1, heat recovery unit 2, circulation pump 3, heat storage tank 4, boiler 5, first valve 6, second valve 7, third valve 8 and first check valve 9. Then use copper pipes to connect the heat recovery unit 2 and air conditioning pipe system 10 and fix them with pipe clamps. Secure them firmly with dovetail nails, and spray and insulate them. Step 4: After the construction is completed, mark the normally open valves and normally closed valves, install the control box and system APP to debug the equipment.

[0031] In this embodiment, the heat recovery unit 2 includes multiple heat exchangers neatly installed on the same plane. The water pipes and copper pipes of the heat recovery unit 2 are well insulated, and the one-way valve and manual valve are well insulated after installation.

[0032] An energy-saving method for recovering waste heat from an air conditioner, the recovery method includes the following modes: Intelligent heat recovery mode: When the air conditioner is turned on for cooling, the refrigerant in the air conditioning piping system 10 begins to flow. At the same time, the second valve 7 is closed, the first valve 6 and the third valve 8 are opened, and the circulation pump 3 is started. Since a circulation loop is formed between the circulation pump 3, the heat exchange end of the heat recovery unit 2, the heat storage tank 4, and the first check valve 9, the heat carried by the refrigerant is transferred to the water flow at the heat exchange end through the heat recovery unit 2. The waste heat in the air conditioning piping system 10 is recovered by the heat recovery unit 2 and stored in the heat storage tank 4 through the circulation pump 3. When the boiler uses hot water, tap water enters the boiler 5 along the water inlet pipe 1, the first valve 6, the circulation pump 3, the heat recovery unit 2, the heat storage tank 4, and the third valve 8. Since the heat recovery unit 2 can use the waste heat in the air conditioning piping system 10 to heat the tap water in the water inlet pipe 1, the heat energy discharged from the air conditioner is utilized, reducing the energy consumption of the boiler 5 in producing hot water, achieving the purpose of energy saving. At the same time, the high load operation of the condenser cooling fan in the air conditioning system is reduced, improving the operating energy consumption of the air conditioner.

[0033] Traditional model: such as Figure 4 As shown, when the air conditioner is not cooling, the first valve 6 and the third valve 8 are closed, and the second valve 7 is opened. When the boiler uses hot water, tap water enters the boiler 5 along the water inlet pipe 1 and the second valve 7, and hot water is used normally.

[0034] Based on the actual working conditions of the store, a system was designed. Without changing the normal operating status and structure of the air conditioner, the system installed the above-mentioned air conditioner waste heat energy-saving recovery system. The system uses the heat energy exchanged between tap water and refrigerant to recover the heat energy for hot water production, lowering the outdoor unit temperature and reducing the electricity required for the outdoor unit's own heat dissipation.

[0035] According to data calculations, the actual investment cost of installing an air conditioning waste heat energy-saving recovery system in a store is about 50,000 yuan. The energy-saving benefits vary depending on the type of gas boiler and electric boiler, and are directly related to the store's actual water consumption. The energy-saving data of using the air conditioning waste heat energy-saving recovery system is as follows: Number of recycling system equipment Energy unit price Save money by running for 15 days Gas store 1 6 units 4.76 / cubic meter 4306.5 yuan Gas Store 2 6 units 4.2 / cubic meter 8170.26 yuan Gas Store 3 8 units 4.24 / cubic meter 4383.31 yuan Electricity store one 5 units 0.62 yuan / kWh 4636.91 yuan Electricity store 2 6 units 0.65 yuan / kWh 4024.85 yuan Electricity store three 8 units 0.68 yuan / kWh 18309.85 yuan The above data shows that gas stores can earn up to 7,000 yuan in energy savings per month, with a payback period of about six months. Electricity stores can earn up to 10,000 yuan per month, with a payback period of about four months.

[0036] All technical features in this embodiment can be freely combined according to actual needs.

[0037] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the scope of protection of the present invention.

Claims

1. An air conditioning waste heat energy-saving recovery system, characterized in that: The invention comprises a water inlet pipe (1), a heat recovery unit (2), a circulation pump (3), a heat storage tank (4), a boiler (5) and an air conditioning pipe system (10), wherein the water inlet pipe (1) is connected to a first valve (6) and a second valve (7) through a three-way connection, the other end of the first valve (6) is connected to the water inlet of the circulation pump (3), the heat exchange end of the heat recovery unit (2) is connected to the water outlet of the circulation pump (3) and the water inlet of the heat storage tank (4), respectively, the water outlet of the heat storage tank (4) is connected to the water inlet of the boiler (5) through a third valve (8), the other end of the second valve (7) is connected to the water inlet of the boiler (5), the water outlet of the heat storage tank (4) is connected to the water inlet of the circulation pump (3) through a first one-way valve (9), and the high-temperature end of the heat recovery unit (2) is connected in series to the outdoor heat dissipation end of the air conditioning pipe system (10).

2. The air conditioning waste heat energy-saving recovery system according to claim 1, characterized in that: The invention also includes a control box, wherein the first valve (6), the second valve (7) and the third valve (8) are all electric valves, and the first valve (6), the second valve (7) and the third valve (8) are all electrically connected to the control box, and the control box is connected to a controller of the air conditioning pipeline system (10).

3. According to the air-conditioning waste heat energy-saving recovery system of claim 2, a second one-way valve (12) is installed between the first valve (6) and the circulation pump (3), and the water outlet ends of the first one-way valve (9) and the second one-way valve (12) are connected through a three-way connection.

4. The air conditioning waste heat energy-saving recovery system according to claim 3, characterized in that: A heat meter (13) is installed between the heat storage tank (4) and the third valve (8), and a temperature sensor (14) is installed between the second one-way valve (12) and the first valve (6). The temperature sensor (14) is electrically connected to the heat meter (13), and the heat meter (13) is electrically connected to the control box.

5. The air conditioning waste heat energy-saving recovery system according to claim 4, characterized in that: A fourth valve (15) is installed between the heat storage tank (4) and the first one-way valve (9), and a fifth valve (11) is installed at the water inlet end of the heat storage tank (4).

6. The air conditioning waste heat energy-saving recovery system according to claim 5, characterized in that: The heat meter (13) is an ultrasonic heat meter. A metal waterproof cover is installed on the outer surface of the heat meter (13). The metal waterproof cover is waterproof on three sides.

7. The air conditioning waste heat energy-saving recovery system according to any one of claims 1 to 6, characterized in that: The configuration method of the air-conditioning waste heat energy-saving recovery system includes: Analyze the waste heat of the air conditioning piping system (10) during cooling; Configure the air conditioning waste heat energy-saving recovery system and select the installation location based on the air conditioning waste heat; Construct an air conditioning waste heat energy-saving recovery system at the selected installation location.

8. The air conditioning waste heat energy-saving recovery system according to claim 7, characterized in that: The method for constructing an air conditioning waste heat energy-saving recovery system includes: Step 1: Clean the construction site and build temporary construction facilities, set up safety protection facilities and warning signs, plan the construction site zones, level the site with a laser level, and lay out the lines; Step 2: Use 8mm thick channel steel to weld into a 2m*0.5m loose frame at the installation location of the hot water storage tank (4), use No. 3 galvanized angle iron to build a support frame for the water pipe, and use No. 4 galvanized angle iron to build a support frame for the heat recovery unit (2); Step 3: Use cold water pipes and hot water pipes to connect the water inlet pipe (1), the heat recovery unit (2), the circulation pump (3), the heat storage tank (4), the boiler (5), the first valve (6), the second valve (7), the third valve (8) and the first check valve (9). Then use copper pipes to connect the heat recovery unit (2) and the air conditioning pipe system (10) and fix them with pipe clamps. Secure them firmly with dovetail nails and spray and insulate them. Step 4: After the construction is completed, mark the normally open valves and normally closed valves, install the control box and system APP to debug the equipment.

9. The air conditioning waste heat energy-saving recovery system according to claim 8, characterized in that: The heat recovery unit (2) comprises a plurality of heat exchangers neatly installed on the same plane, and the water pipes and copper pipes of the heat recovery unit (2) are well insulated.

10. An energy-saving air-conditioning waste heat recovery method according to any one of claims 1 to 9, characterized in that: The recycling method includes the following modes: Heat recovery intelligent mode: When the air conditioner is turned on for cooling, the refrigerant in the air conditioning pipe system (10) begins to flow, and at the same time the second valve (7) is closed, the first valve (6) and the third valve (8) are opened, and then the circulation pump (3) is started. Since a circulation loop is formed between the circulation pump (3), the heat exchange end of the heat recovery unit (2), the heat storage tank (4) and the first one-way valve (9), the heat carried by the refrigerant is transferred to the water flow at the heat exchange end through the heat recovery unit (2), thereby cooling the air conditioning pipe system (10) through the heat recovery unit (2). 0) is recovered and stored in the heat storage tank (4) through the circulation pump (3). When the boiler uses hot water, tap water flows along the water inlet pipe (1), the first valve (6), the circulation pump (3), the heat recovery unit (2), the heat storage tank (4) and the third valve (8) into the boiler (5). Since the heat recovery unit (2) can heat the tap water in the water inlet pipe (1) with the waste heat in the air conditioning pipe system (10), the heat energy discharged by the air conditioner is utilized, thereby reducing the energy consumption of the boiler (5) in making hot water; Traditional mode: When the air conditioner is not cooling, the first valve (6) and the third valve (8) are closed, and the second valve (7) is opened. When the boiler uses hot water, tap water flows along the water inlet pipe (1) and the second valve (7) into the boiler (5), and hot water is used normally.

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