Air conditioning system with double-pipe heat exchanger

Abstract

The air conditioning system with the double-pipe heat exchanger comprises a heat pump system and a water heat exchange system, the heat pump system comprises a condenser, an evaporator, a compressor, an expansion throttler and a four-way reversing valve, the condenser and the evaporator are the double-pipe heat exchanger, cooling water is introduced into an inner pipe, and a refrigerant is introduced into an outer pipe; the water heat exchange system comprises a condenser inner pipe, an evaporator inner pipe, a water heater, waste heat exchangers and a circulating water pump, the condenser inner pipe, the evaporator inner pipe, the water heater, the waste heat exchangers and the circulating water pump are communicated with the condenser inner pipe and the evaporator inner pipe to form the water heat exchange system, one or more waste heat exchangers exchange heat with domestic wastewater and waste gas and are connected in the water heat exchange system in parallel, and the water heater is a water-water heat exchanger. The waste heat exchanger and the water heater are connected in parallel in the water heat exchange system, various waste heat and waste gas in families are used for air conditioning, water heating, defrosting and the like through circulation of the circulating water pump and the heat pump, heat energy is comprehensively and effectively utilized, the double-pipe heat exchanger can be used for air cooling and water cooling, the heat exchange efficiency is greatly improved compared with an air cooling heat exchanger, and the energy-saving effect is remarkable.

Description

Technical Field

[0001] The present invention belongs to the field of air-conditioning refrigeration, and particularly relates to an air-conditioning system with a shell-and-tube heat exchanger. Background Art

[0002] Frost formation on the outdoor unit of an air conditioner in winter is a common problem. Stopping the machine for defrosting will affect indoor heating. Using electric heating for defrosting consumes electric energy. However, a lot of waste heat is generated in households, such as bathing wastewater, high-temperature cooking fumes, etc., which contain a large amount of thermal energy and are not fully recovered and utilized but are completely discharged, resulting in waste. Summary of the Invention

[0003] The purpose of the present invention is to provide an air-conditioning system that can comprehensively utilize various waste heat generated in households to provide air-conditioning cold and hot water, domestic hot water, and defrosting.

[0004] The solution of the present invention is: an air-conditioning system with a shell-and-tube heat exchanger, which includes a heat pump system and a water heat exchange system. Its characteristics are that the heat pump system includes a condenser, an evaporator, a compressor, an expansion throttle, and a four-way reversing valve. The condenser and the evaporator are shell-and-tube heat exchangers. The inner tube passes cooling water, and the outer tube passes refrigerant. The outer wall of the shell is a smooth tube or is provided with fins. The refrigerant exchanges heat with the cooling water through the inner tube and exchanges heat with the air through the outer tube. The condenser serves as the outdoor unit to exchange heat with the outdoor air, and the evaporator serves as the indoor unit to exchange heat with the indoor air; the water heat exchange system includes the inner tube of the condenser, the inner tube of the evaporator, a water heater, a waste heat exchanger, a circulating water pump, an expansion tank, and valves. The circulating water pump has a condenser circulating water pump and an evaporator circulating water pump. The above-mentioned devices are connected to the inner tubes of the condenser and the evaporator to form a water heat exchange system; the inlet and outlet water pipelines of the inner tube of the condenser have two loops, each loop has two valves, and is connected to the condenser circulating water pump, the water heater, and the waste heat exchanger. By switching the valves, a heat dissipation circulation loop or a heat absorption circulation loop is formed. The inlet and outlet water pipelines of the inner tube of the evaporator form a hot water circulation loop with the evaporator circulating water pump, the water heater, and the valves, and are connected to the above-mentioned heat absorption circulation loop and heat dissipation circulation loop through two valves; the waste heat exchanger exchanges heat with domestic wastewater and waste gas, and there is one or more, which are connected in parallel in the water heat exchange system. It is a water-water heat exchanger or a water-air heat exchanger. The water heater is a water-water heat exchanger. The waste heat exchanger and the water heater are connected in parallel in the water heat exchange system and each has its own valve. Through the circulation of the circulating water pump, the wastewater and waste gas exchange heat with the water in the water heat exchange system, and the refrigerant exchanges heat in the condenser and the evaporator, transferring the thermal energy of the wastewater and waste gas and the refrigerant condensation heat to the condenser, the evaporator, and the water heater. By switching the valves, the flow direction of the cooling water in the inner tubes of the condenser and the evaporator is opposite to the flow direction of the refrigerant, improving the heat exchange efficiency.

[0005] When the heat pump system is in the refrigeration cycle, the refrigerant in the outer tube of the evaporator evaporates and absorbs heat, sending cold air to the room. The evaporator circulation water pump stops, and there is no cooling water flowing through its shell-and-tube heat exchanger. The refrigerant in the outer tube of the condenser condenses and releases heat. The condenser circulation water pump starts, and through valve switching, the heat dissipation circulation loop starts to operate. The cooling water passes through the inner tube of the condenser and then circulates through the water heater and the waste heat exchanger, using the condensation heat of the refrigerant to preferentially heat the domestic hot water of the water heater. The remaining condensation heat of the refrigerant is discharged into the waste water and waste gas through the waste heat exchanger, and heat is dissipated to the outdoor air through the outer tube of the condenser.

[0006] When the heat pump system is in the heating cycle, the evaporator is converted into a condenser. The refrigerant in the outer tube condenses and releases heat, sending hot air to the room. The evaporator circulation water pump starts, and the hot water circulation loop starts to operate. At the same time, the valve connected to the heat absorption circulation loop is closed. The cooling water passes through the inner tube of the evaporator and then circulates through the water heater, using the condensation heat of the refrigerant to heat the domestic hot water of the water heater. The condenser is converted into an evaporator, and the refrigerant in the outer tube evaporates and absorbs heat from the outdoor air and the cooling water. The condenser circulation water pump starts, and the heat absorption circulation loop starts to operate. The cooling water passes through the inner tube of the condenser and then circulates through the waste heat exchanger. The cooling water absorbs the heat energy of the waste water and waste gas from the waste heat exchanger and transfers it to the condenser.

[0007] When the outdoor condenser frosts in winter, the heat pump system is in the heating cycle. The evaporator is converted into a condenser. The refrigerant in the outer tube condenses and releases heat, sending hot air to the room. The condenser is converted into an evaporator. The refrigerant in the outer tube evaporates and absorbs heat from the outdoor air and the cooling water. The condenser circulation water pump is started, and the evaporator circulation water pump stops. The heat absorption circulation loop starts to operate and is connected to the water heater to form a defrosting circulation loop. The cooling water absorbs the heat energy of the domestic hot water from the water heater and absorbs heat from the waste water and waste gas through the waste heat exchanger. The condenser circulation water pump circulates and transfers the heat energy to the condenser. The refrigerant evaporates and absorbs the heat energy therein, reducing the heat absorbed from the air. Under the blowing of the condenser fan, the frost will gradually melt. If the heat pump system stops, the defrosting will be faster.

[0008] When hot water needs to be produced separately in any season, the heat pump system is in the heating cycle. The condenser is converted into an evaporator, absorbing heat from the outdoor air, waste water, and waste gas. The heat absorption circulation loop starts to operate. The waste heat exchanger absorbs heat from the waste water and waste gas and circulates through the condenser circulation water pump to transfer the heat energy to the condenser. The evaporator is converted into a condenser, not sending hot air to the room. The evaporator circulation water pump starts, and the hot water circulation loop starts to operate. At the same time, the valve connected to the heat absorption circulation loop is closed. All the condensation heat of the refrigerant is used to heat the domestic hot water. Various cold heat sources such as waste heat and waste gas are comprehensively and effectively utilized. The shell-and-tube heat exchanger can be cooled by air or water, and the heat transfer efficiency is increased by more than 30% compared with the air-cooled heat exchanger, with significant energy-saving effects. Description of the Drawings

[0009] Figure 1 It is the system of the double-pipe heat exchanger and the air conditioning system Figure 1 Figure 2 It is the system of the double-pipe heat exchanger and the air conditioning system Figure 2 Figure 3 It is the system of the double-pipe heat exchanger and the air conditioning system Figure 3 Figure 4 It is the system of the double-pipe heat exchanger and the air conditioning system Figure 4 Figure 5 It is the system of the double-pipe heat exchanger and the air conditioning system Figure 5 Figure 6 It is the system of the double-pipe heat exchanger and the air conditioning system Figure 6 Figure 7 It is the system of the double-pipe heat exchanger and the air conditioning system Figure 7 Figure 8 It is the outdoor unit structure Figure 1 Figure 9 It is the outdoor unit structure Figure 2 Figure 10 It is the outdoor unit structure Figure 3 Explanation of reference numerals: 1. Compressor, 2. Four-way reversing valve, 3. Condenser, 4, 34, 35. Expansion throttle, 5. Evaporator, 6. Gas-liquid separator, 7. Condenser fan, 8. Evaporator fan, 9, 10. Circulating water pump, 11, 12. Expansion tank, 13, 14. Waste heat exchanger, 15, 31. Water heater, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30. Solenoid valve, 32. Air-cooled evaporator, 33. Three-way regulating valve, 36, 37. Water-cooled evaporator, 38. Manifold Detailed implementation manners

[0010] Figure 1In an air conditioning system with a shell-and-tube heat exchanger, it includes a heat pump system and a water heat exchange system. The characteristics are as follows: The heat pump system includes a condenser 3, an evaporator 5, a compressor 1, an expansion throttle 4, and a four-way reversing valve 2. The condenser 3 and the evaporator 5 are shell-and-tube heat exchangers. The inner tube passes cooling water, and the outer tube passes refrigerant. The outer wall of the shell is a smooth tube or is provided with fins. The condenser 3 serves as an outdoor unit to exchange heat with outdoor air, and the evaporator 5 serves as an indoor unit to exchange heat with indoor air; The water heat exchange system includes the inner tubes of the condenser 3, the inner tubes of the evaporator 5, a water heater 15, waste heat exchangers 13, 14, circulation pumps 9, 10, expansion tanks 11, 12, solenoid valves 16, 17, 18, 19, 20, 21, 22, 23, 24. There are a condenser circulation pump 9 and an evaporator circulation pump 10 for the circulation pumps. The above-mentioned devices are connected to the inner tubes of the condenser 3 and the evaporator 5 to form a water heat exchange system; The inlet and outlet water pipelines of the inner tube of the condenser 3 have two loops, and each loop is respectively provided with two solenoid valves 16, 19 and 17, 18, and are connected to the condenser circulation pump 9, the water heater 15, and the waste heat exchangers 13, 14. By switching the solenoid valves 16, 19 and 17, 18, a heat dissipation circulation loop or a heat absorption circulation loop is formed. The inlet and outlet water pipelines of the inner tube of the evaporator 5 form a hot water circulation loop with the evaporator circulation pump 10, the water heater 15, and the solenoid valve 24, and are connected to the above-mentioned heat absorption circulation loop and heat dissipation circulation loop through the solenoid valves 20, 21; The waste heat exchangers 13, 14 exchange heat with domestic wastewater and waste gas. There is one or more of them, which are connected in parallel in the water heat exchange system. They are water-water heat exchangers and water-air heat exchangers. The waste heat exchanger 13 is a water-air heat exchanger, and the waste heat exchanger 14 is a water-water heat exchanger. The water heater 15 is a water-water heat exchanger. The waste heat exchangers 13, 14 and the water heater 15 are connected in parallel in the water heat exchange system and each is provided with a solenoid valve. Through the circulation of the circulation pumps 9, 10, the wastewater and waste gas exchange heat with the water in the water heat exchange system, and the refrigerant exchanges heat in the condenser 3 and the evaporator 5, transferring the heat energy of the wastewater and waste gas and the refrigerant condensation heat to the condenser 3, the evaporator 5, and the water heater 15.

[0011] The waste heat exchanger 14 is a water-water heat exchanger. The waste water comes from bathing, washing, flushing toilets, laundry, etc. The temperature of the bathing waste water is relatively high, and the heat energy in it can be recovered. The washing and laundry waste water and the tap water for flushing toilets can not only recover the heat energy in winter, but also be used as cooling water in summer. The waste heat exchanger 13 is a water-air heat exchanger. The waste gas comes from high-temperature cooking fumes and bathroom exhaust. The water-air heat exchanger can be used to recover the heat energy of the high-temperature cooking fumes. The bathroom exhaust can not only recover the heat energy in winter, but also be used as cooling in summer. The waste heat exchangers 13 and 14 and the water heater 15 can adopt heat exchangers in the forms of serpentine tubes, spiral tubes, shell tubes, etc. For example, the serpentine tubes and spiral tubes can be placed in the toilet cistern to heat the tap water or absorb heat from it, and finally be used for flushing toilets; the serpentine tubes, spiral tubes and shell tube heat exchangers can be connected to the drain pipe of the washing machine, and the laundry waste water exchanges heat with the cooling water, discharging heat to the laundry waste water or absorbing heat from it; a box with a serpentine tube and spiral tube heat exchanger can be placed on the ground under the shower. People stand above to take a shower, and the waste water after flushing flows into the box, and the cooling water can absorb the heat energy of the waste water. Since the high-temperature refrigerant indirectly heats the domestic hot water through the cooling water, it is difficult for the hot water temperature to reach above 50°C. An auxiliary electric heating device should be installed in the water heater 15. The water heater 15 can also be used as a preheating device for the gas water heater.

[0012] When the heat pump system is in the refrigeration cycle, the refrigerant flow path is: compressor 1 → four-way reversing valve 2 → condenser 3 → expansion throttle 4 → evaporator 5 → four-way reversing valve 2 → gas-liquid separator 6 → compressor 1. The cooling water flow path is: circulation pump 9 → solenoid valve 16 → condenser 3 → solenoid valve 19, and then it is divided into two paths. One path: solenoid valve 20 → water heater 15 → solenoid valve 21 → circulation pump 9, and the other path: solenoid valve 22 → waste heat exchanger 14 (in parallel with solenoid valve 23 → waste heat exchanger 13) → circulation pump 9. Finally, the two paths converge to the circulation pump 9 to complete one cycle. At this time, the solenoid valves 17, 18, and 24 are closed. The refrigerant in the outer tube of the evaporator 5 evaporates and absorbs heat, sending cold air to the room. The evaporator circulation pump 10 stops, and there is no cooling water flowing through its shell-and-tube heat exchanger. The refrigerant in the outer tube of the condenser 3 condenses and releases heat, and the condenser circulation pump 9 starts. Through the switching of the solenoid valves, the heat dissipation circulation circuit starts to operate. The cooling water passes through the inner tube of the condenser 3, and preferentially heats the domestic hot water of the water heater 15 by using the condensation heat of the refrigerant. The remaining condensation heat of the refrigerant is discharged to the waste water and waste gas through the waste heat exchangers 13 and 14, and dissipates heat to the outdoor air through the outer tube of the condenser 3.

[0013] When the heat pump system is in the heating cycle, the refrigerant flow path is: compressor 1 → four-way reversing valve 2 → evaporator 5 → expansion throttle 4 → condenser 3 → four-way reversing valve 2 → gas-liquid separator 6 → compressor 1. The cooling water flow path is two-way circulation: circulation pump 9 → solenoid valve 18 → condenser 3 → solenoid valve 17 → solenoid valve 22 → waste heat exchanger 14 (parallel solenoid valve 23 → waste heat exchanger 13) → circulation pump 9, at this time solenoid valves 16 and 19 are closed; circulation pump 10 → evaporator 5 → water heater 15 → solenoid valve 24 → circulation pump 10, at this time solenoid valves 20 and 21 are closed. The evaporator 5 is converted into a condenser, the refrigerant in the outer tube condenses and releases heat, sending hot air to the room, the evaporator circulation pump 10 starts, and the hot water circulation loop starts to operate. At the same time, solenoid valves 20 and 21 connected to the heat absorption circulation loop are closed. The cooling water passes through the inner tube of the evaporator 5 and circulates through the water heater 15, using the heat released by the refrigerant condensation to heat the domestic hot water of the water heater 15. The condenser 3 is converted into an evaporator, the refrigerant in the outer tube evaporates and absorbs heat from the outdoor air and the cooling water, the condenser circulation pump 9 starts, and the heat absorption circulation loop starts to operate. The cooling water passes through the inner tube of the condenser 3 and then circulates through the waste heat exchangers 13 and 14. The cooling water absorbs the heat energy of the waste water and waste gas from the waste heat exchangers 13 and 14 and transfers it to the condenser 3.

[0014] When the outdoor condenser 3 frosts in winter, the heat pump system can defrost without stopping during the heating cycle. The refrigerant flow path is: compressor 1 → four-way reversing valve 2 → evaporator 5 → expansion throttle 4 → condenser 3 → four-way reversing valve 2 → gas-liquid separator 6 → compressor 1. The cooling water flow path is: circulation pump 9 → solenoid valve 18 → condenser 3 → solenoid valve 17, and then it divides into two paths. One path: solenoid valve 20 → water heater 15 → solenoid valve 21 → circulation pump 9, and the other path: solenoid valve 22 → waste heat exchanger 14 (parallel solenoid valve 23 → waste heat exchanger 13) → circulation pump 9. Finally, the two paths converge to the circulation pump 9 to complete one cycle. At this time, solenoid valves 16, 19, and 24 are closed. The condenser 3 is converted into an evaporator, the refrigerant in the outer tube evaporates and absorbs heat from the outdoor air and the cooling water. The condenser circulation pump 9 is started, and the heat absorption circulation loop starts to operate and is connected to the water heater 15 to form a defrosting circulation loop. The cooling water absorbs the heat energy of the domestic hot water from the water heater 15 and absorbs heat from the waste water and waste gas through the waste heat exchangers 13 and 14, and circulates through the condenser circulation pump 9 to transfer the heat energy to the condenser 3. The refrigerant evaporates and absorbs the heat energy therein, reducing the heat absorbed from the air. Under the blowing of the condenser fan 7, the frost will gradually melt. At the same time, the evaporator circulation pump 10 stops, and the evaporator 5 sends hot air to the room without affecting indoor heating. If the heat pump system stops operating, the heat energy of the waste heat exchangers 13, 14, and the water heater 15 can be used to quickly defrost.

[0015] When hot water needs to be produced separately in any season, in the heating cycle of the heat pump system, the refrigerant flow path is: compressor 1 → four-way reversing valve 2 → evaporator 5 → expansion throttle 4 → condenser 3 → four-way reversing valve 2 → gas-liquid separator 6 → compressor 1. The cooling water flow path has two loops: circulating water pump 9 → solenoid valve 18 → condenser 3 → solenoid valve 17 → solenoid valve 22 → waste heat exchanger 14 (parallel solenoid valve 23 → waste heat exchanger 13) → circulating water pump 9, at this time solenoid valves 16 and 19 are closed; circulating water pump 10 → evaporator 5 → water heater 15 → solenoid valve 24 → circulating water pump 10, at this time solenoid valves 20 and 21 are closed. The condenser 3 is converted into an evaporator, absorbing heat from outdoor air, wastewater and waste gas, and the heat absorption cycle loop starts to operate. The waste heat exchangers 13 and 14 absorb heat from wastewater and waste gas, circulate through the condenser circulating water pump 9, and transfer the heat energy to the condenser 3. The evaporator 5 is converted into a condenser, not sending hot air to the room, the evaporator circulating water pump 10 starts, and the hot water circulation loop starts to operate. At the same time, solenoid valves 20 and 21 connected to the heat absorption cycle loop are closed, and all the condensing heat of the refrigerant heats the domestic hot water of the water heater 15. Therefore, various wastewaters and waste gases in the family are comprehensively and effectively utilized, and the energy-saving effect is remarkable.

[0016] Since the evaporator 5 is a double-tube heat exchanger, it is suitable for use in large indoor cabinet units. Through valve adjustment, the flow direction of the cooling water in the inner tubes of the condenser 3 and the evaporator 5 is opposite to the flow direction of the refrigerant, improving the heat exchange efficiency. The circulating water pumps 9 and 10 are preferably variable-frequency water pumps. The cooling water of the hot water exchange system is pure water and does not scale, and antifreeze should be added to prevent the condenser 3 of the outdoor unit from freezing in winter. The expansion tanks 11 and 12 should be higher than the system, and pure water can be supplemented to the hot water exchange system through them. Solenoid valves 21, 22, 23, 24, etc. can use electric control valves or manual control valves to adjust the flow rate of the cooling water according to the heating and cooling load. Since waste heat and waste gas are not continuous and are randomly generated, sensors need to be set to control the opening and closing of the solenoid valves, and the intelligent control device controls the effective operation of the system.

[0017] Figure 2In an air-conditioning system with a shell-and-tube heat exchanger, it includes a refrigeration system and a water heat exchange system. The characteristics are that the refrigeration system is a single-cooling system with a one-way circulation of refrigerant. It includes a condenser 3, an evaporator 5, a compressor 1, and an expansion throttle 4. The condenser 3 and the evaporator 5 are shell-and-tube heat exchangers. The inner tube passes cooling water, and the outer tube passes refrigerant. The outer wall of the shell is a smooth tube or is finned. The condenser 3 serves as an outdoor unit to exchange heat with outdoor air, and the evaporator 5 serves as an indoor unit to exchange heat with indoor air. The water heat exchange system includes the inner tubes of the condenser 3, the inner tubes of the evaporator 5, a water heater 15, waste heat exchangers 13, 14, circulation pumps 9, 10, expansion tanks 11, 12, solenoid valves 22, 23, 25, 26, 27, 28, 29. There are a condenser circulation pump 9 and an evaporator circulation pump 10 for the circulation pumps. The above-mentioned devices are connected to the inner tubes of the condenser 3 and the evaporator 5 to form a water heat exchange system. The inlet and outlet water pipelines of the inner tube of the condenser 3, the water heater 15, the waste heat exchangers 13, 14, the circulation pump 9, the expansion tank 11, and the solenoid valves 22, 23, 25, 28, 29 form a heat dissipation circulation loop to discharge the condensation heat. The inlet and outlet water pipelines of the inner tube of the condenser 3, the water heater 15, the circulation pump 9, the expansion tank 11, and the solenoid valve 29 form a hot water circulation loop. At the same time, the inlet and outlet water pipelines of the inner tube of the evaporator 5, the waste heat exchangers 13, 14, the circulation pump 10, the expansion tank 12, and the solenoid valves 22, 23, 26, 27 form a heat absorption circulation loop. The hot water circulation loop and the heat absorption circulation loop are disconnected by the solenoid valves 25, 28, and the domestic hot water of the water heater 15 is heated by using the condensation heat. There is one or more waste heat exchangers 13, 14, which are connected in parallel in the water heat exchange system. They are water-water heat exchangers and water-air heat exchangers. The waste heat exchanger 13 is a water-air heat exchanger, and the waste heat exchanger 14 is a water-water heat exchanger. The water heater 15 is a water-water heat exchanger. The waste heat exchangers 13, 14 and the water heater 15 are connected in parallel in the water heat exchange system and each is equipped with a solenoid valve. Through the circulation of the circulation pumps 9, 10, the waste water and waste gas exchange heat with the water in the water heat exchange system, and the refrigerant exchanges heat in the condenser 3 and the evaporator 5, transferring the heat energy of the waste water and waste gas and the refrigerant condensation heat to the condenser 3, the evaporator 5, and the water heater 15.

[0018] Since the refrigeration system is a single-cooling system with a year-round refrigeration cycle, the refrigerant flow path is: compressor 1 → condenser 3 → expansion throttle 4 → evaporator 5 → gas-liquid separator 6 → compressor 1. The cooling water flow path is: circulation pump 9 → condenser 3, and then it divides into two paths. One path: solenoid valve 29 → water heater 15 → circulation pump 9. The other path: solenoid valve 25 → solenoid valve 22 → waste heat exchanger 14 (parallel solenoid valve 23 → waste heat exchanger 13) → solenoid valve 28 → circulation pump 9. Finally, the two paths converge to circulation pump 9 to complete one cycle. At this time, solenoid valves 26 and 27 are closed. The refrigerant in the outer tube of the evaporator 5 evaporates and absorbs heat, sending cold air to the room. Circulation pump 10 stops operating, and there is no cooling water flowing through its casing heat exchanger. The refrigerant in the outer tube of the condenser 3 condenses and releases heat. Circulation pump 9 starts, and the cooling water passes through the inner tube of the condenser 3, using the refrigerant condensation heat to preferentially heat the domestic hot water of the water heater 15. The remaining refrigerant condensation heat is discharged into wastewater and waste gas through waste heat exchangers 13 and 14, and dissipates heat to the outdoor air through the outer tube of the condenser 3.

[0019] When hot water needs to be produced separately in any season, the refrigerant circulation flow path remains unchanged. The cooling water flow path is two-way circulation: One path, circulation pump 9 → condenser 3 → solenoid valve 29 → water heater 15 → circulation pump 9; The other path, circulation pump 10 → solenoid valve 26 → solenoid valve 22 → waste heat exchanger 14 (parallel solenoid valve 23 → waste heat exchanger 13) → solenoid valve 27 → evaporator 5 → circulation pump 10. Solenoid valves 25 and 28 are closed. The refrigerant in the outer tube of the evaporator 5 evaporates and absorbs heat, sending cold air to the room. The cooling water absorbs the heat energy of wastewater and waste gas from waste heat exchangers 13 and 14 and transfers it to the evaporator 5. In this way, the evaporator 5 absorbs heat from the indoor air and the cooling water. Through the refrigeration cycle, the refrigerant condensation heat is transferred to the condenser 3, and then circulated through the circulation pump 9. All the refrigerant condensation heat is used to heat the domestic hot water of the water heater 15. At this time, the condenser fan 8 stops operating. To prevent the condenser 3 from dissipating heat to the outside, an electric air inlet can be set on the outdoor unit, and the air inlet is closed at this time. This single-cooling air-conditioning system is suitable for use in southern regions that require refrigeration throughout the year.

[0020] Figure 3In an air conditioning system with a shell-and-tube heat exchanger, it includes a heat pump system and a water heat exchange system. The characteristics are as follows: The heat pump system includes a condenser 3, a water heater 31, an air-cooled evaporator 32, a compressor 1, an expansion throttle 4, a four-way reversing valve 2, and a three-way regulating valve 33. The condenser 3 is a shell-and-tube heat exchanger, with cooling water flowing through the inner tube and refrigerant flowing through the outer tube. The outer wall of the shell is a smooth tube or is finned. The condenser 3 serves as an outdoor unit to exchange heat with outdoor air, and the air-cooled evaporator 32 serves as an indoor unit to exchange heat with indoor air. The water heat exchange system includes the inner tube of the condenser 3, the water heater 31, waste heat exchangers 13, 14, a circulating water pump 9, an expansion tank 11, solenoid valves 16, 17, 18, 19, 22, 23, 30. The above-mentioned devices are connected to the inner tube of the condenser 3 to form a water heat exchange system. The inlet and outlet water pipelines of the inner tube of the condenser 3 have two loops, and each loop has two solenoid valves 16, 19 and 17, 18 respectively. The inlet and outlet water pipelines of the inner tube of the condenser 3, the condenser circulating water pump 9, the water heater 31, the waste heat exchangers 13, 14, and the solenoid valves 16, 19, 22, 23, 30 form a heat dissipation circulation loop to discharge the condensation heat and heat the domestic hot water; the inlet and outlet water pipelines of the inner tube of the condenser 3, the condenser circulating water pump 9, the waste heat exchangers 13, 14, and the solenoid valves 17, 18, 22, 23 form an endothermic circulation loop to heat the domestic hot water. There is one or more waste heat exchangers 13, 14, which are connected in parallel in the water heat exchange system. They are water-water heat exchangers, water-air heat exchangers. The waste heat exchanger 13 is a water-air heat exchanger, and the waste heat exchanger 14 is a water-water heat exchanger. The water heater 31 is a combination of a water-water heat exchanger and a water-refrigerant heat exchanger, and can adopt heat exchangers in the form of serpentine tubes, spiral tubes, shell tubes, etc. Its water-water heat exchanger is connected to the water heat exchange system, and its water-refrigerant heat exchanger is connected to the heat pump system and is connected in parallel with the air-cooled evaporator 32 through the three-way regulating valve 33 in the heat pump system. The waste heat exchangers 13, 14 and the water heater 31 are connected in parallel in the water heat exchange system and each has a solenoid valve, and circulate through the circulating water pump 9. The waste water and waste gas exchange heat with the water in the water heat exchange system, and the refrigerant exchanges heat in the condenser 3, the air-cooled evaporator 32, and the water heater 31, transferring the heat energy of the waste water and waste gas and the refrigerant condensation heat to the condenser 3, the air-cooled evaporator 32, and the water heater 31.

[0021] When the heat pump system is in the refrigeration cycle, the valve port of the three-way regulating valve 33 connected to the water heater 31 is closed, and the valve port connected to the air-cooled evaporator 32 is fully open. The refrigerant flow path is: compressor 1 → four-way reversing valve 2 → condenser 3 → expansion throttle 4 → air-cooled evaporator 32 → three-way regulating valve 33 → four-way reversing valve 2 → gas-liquid separator 6 → compressor 1. The cooling water flow path is: circulation pump 9 → solenoid valve 16 → condenser 3 → solenoid valve 19, and then it divides into two paths. One path is: water heater 31 → solenoid valve 30 → circulation pump 9, and the other path is: solenoid valve 22 → waste heat exchanger 14 (in parallel with solenoid valve 23 → waste heat exchanger 13) → circulation pump 9. Finally, the two paths converge to the circulation pump 9, and the heat dissipation circulation loop completes one cycle. The cooling water heats the domestic hot water of the water heater 31. At this time, the solenoid valves 17 and 18 are closed. All the refrigerant evaporates and absorbs heat in the air-cooled evaporator 32, sending cold air to the room. The refrigerant in the outer tube of the condenser 3 condenses and releases heat. The circulation pump 9 starts, and the cooling water passes through the inner tube of the condenser 3, using the condensation heat of the refrigerant to preferentially heat the domestic hot water of the water heater 31. The remaining condensation heat of the refrigerant is discharged into the waste water and waste gas through the waste heat exchangers 13 and 14, and the heat is dissipated to the outdoor air through the outer tube of the condenser 3.

[0022] When the heat pump system is in the heating cycle, the valve ports of the three-way regulating valve 33 connected to the water heater 31 and the air-cooled evaporator 32 are in the adjustment state. The refrigerant flow path is: compressor 1 → four-way reversing valve 2 → three-way regulating valve 33 → air-cooled evaporator 32 (in parallel with water heater 31) → expansion throttle 4 → condenser 3 → four-way reversing valve 2 → gas-liquid separator 6 → compressor 1. The cooling water flow path is: circulation pump 9 → solenoid valve 18 → condenser 3 → solenoid valve 17 → solenoid valve 22 → waste heat exchanger 14 (in parallel with solenoid valve 23 → waste heat exchanger 13) → circulation pump 9, and the heat absorption circulation loop completes one cycle. At this time, the solenoid valves 16, 19, and 30 are closed. The air-cooled evaporator 32 is converted into a condenser. A part of the high-temperature refrigerant flows through the air-cooled evaporator 32, sending hot air to the room. Another part of the high-temperature refrigerant flows through the water heater 31, using the condensation heat of the refrigerant to heat the domestic hot water of the water heater 31. The condenser 3 is converted into an evaporator, and the refrigerant in the outer tube evaporates and absorbs heat from the outdoor air and the cooling water. The circulation pump 9 starts, and the cooling water absorbs the heat energy of the waste water and waste gas from the waste heat exchangers 13 and 14 and transfers it to the condenser 3.

[0023] When the outdoor condenser 3 in winter is frosted, the heat pump system can defrost without stopping during the heating cycle. The refrigerant flow path is: compressor 1 → four-way reversing valve 2 → three-way regulating valve 33 → air-cooled evaporator 32 → expansion throttle 4 → condenser 3 → four-way reversing valve 2 → gas-liquid separator 6 → compressor 1. The cooling water flow path is: circulation pump 9 → solenoid valve 18 → condenser 3 → solenoid valve 17, and then it divides into two paths. One path: water heater 31 → solenoid valve 30 → circulation pump 9, and the other path: solenoid valve 22 → waste heat exchanger 14 (parallel solenoid valve 23 → waste heat exchanger 13) → circulation pump 9. Finally, the two paths converge to the circulation pump 9, and the defrosting heat absorption cycle loop completes one cycle. At this time, solenoid valves 16 and 19 are closed. The cooling water absorbs the domestic hot water heat energy from the water heater 31, absorbs heat from the waste water and waste gas through the waste heat exchangers 13 and 14, circulates through the circulation pump 9, and transfers the heat energy to the condenser 3. The refrigerant evaporates and absorbs the heat energy therein, reducing the heat absorbed from the air. Under the blowing of the condenser fan 7, the frost will gradually melt. At the same time, the air-cooled evaporator 32 sends hot air into the room without affecting the indoor heating. If the heat pump system stops operating, the heat energy of the waste heat exchangers 13, 14, and water heater 31 can be used to quickly defrost.

[0024] When it is necessary to separately produce hot water in any season, for the heating cycle of the heat pump system, the valve port connecting the three-way regulating valve 33 and the water heater 31 is fully opened, and the valve port connecting to the air-cooled evaporator 32 is closed. The refrigerant flow path is: compressor 1 → four-way reversing valve 2 → three-way regulating valve 33 → water heater 31 → expansion throttle 4 → condenser 3 → four-way reversing valve 2 → gas-liquid separator 6 → compressor 1. The cooling water flow path is: circulation pump 9 → solenoid valve 18 → condenser 3 → solenoid valve 17 → solenoid valve 22 → waste heat exchanger 14 (parallel solenoid valve 23 → waste heat exchanger 13) → circulation pump 9. The heat absorption cycle loop completes one cycle. At this time, solenoid valves 16, 19, and 30 are closed. The water heater 31 uses all the condensation heat of the refrigerant to heat the domestic hot water. The condenser 3 is converted into an evaporator, and the refrigerant in the outer tube evaporates and absorbs heat, absorbing heat from the outdoor air and the cooling water. The circulation pump 9 starts, and the cooling water absorbs the heat energy of the waste water and waste gas from the waste heat exchangers 13 and 14 and transfers it to the condenser 3.

[0025] Figure 4 In [system name] cancels Figure 3 the three-way regulating valve 33 in [system name], and two expansion throttles 34 and 35 are provided in parallel in the heat pump system. One expansion throttle 34 is connected in series with the water heater 31 and the air-cooled evaporator 32 in the heat pump system, and the other expansion throttle 35 is connected in parallel with this expansion throttle 34 and the water heater 31. The other expansion throttle 35 is connected in series with the air-cooled evaporator 32 in the heat pump system and is connected in parallel with the water heater 31.

[0026] When the heat pump system is in the refrigeration cycle, the expansion throttle 35 is fully open and the expansion throttle 34 is closed. The refrigerant flow path is: compressor 1 → four-way reversing valve 2 → expansion throttle 35 → air-cooled evaporator 32 → four-way reversing valve 2 → gas-liquid separator 6 → compressor 1. The cooling water flow path is: circulating water pump 9 → solenoid valve 16 → condenser 3 → solenoid valve 19, and then it divides into two paths. One path: solenoid valve 22 → waste heat exchanger 14 (parallel solenoid valve 23 → waste heat exchanger 13) → circulating water pump 9, and the other path: water heater 31 → solenoid valve 30 → circulating water pump 9. The heat dissipation circulation loop completes one cycle, and the cooling water heats the domestic hot water of the water heater 31. At this time, the solenoid valves 17 and 18 are closed. All the refrigerant evaporates and absorbs heat in the air-cooled evaporator 32, sending cold air to the room. The refrigerant in the outer tube of the condenser 3 condenses and releases heat. The circulating water pump 9 starts, and the cooling water passes through the inner tube of the condenser 3, using the condensation heat of the refrigerant to preferentially heat the domestic hot water of the water heater 31. The remaining condensation heat of the refrigerant is discharged into the waste water and waste gas through the waste heat exchangers 13 and 14, and heat is dissipated to the outdoor air through the outer tube of the condenser 3.

[0027] When the heat pump system is in the heating cycle, the expansion throttle 35 is closed and the expansion throttle 34 is fully open. The refrigerant flow path is: compressor 1 → four-way reversing valve 2 → air-cooled evaporator 32 → water heater 31 → expansion throttle 34 → condenser 3 → four-way reversing valve 2 → gas-liquid separator 6 → compressor 1. The cooling water flow path is: circulating water pump 9 → solenoid valve 18 → condenser 3 → solenoid valve 17 → solenoid valve 22 → waste heat exchanger 14 (parallel solenoid valve 23 → waste heat exchanger 13) → circulating water pump 9. The heat absorption circulation loop completes one cycle. At this time, the solenoid valves 16, 19, and 30 are closed. The air-cooled evaporator 32 is converted into a condenser. The high-temperature refrigerant first dissipates part of the heat in the air-cooled evaporator 32, sending hot air to the room. The remaining heat heats the domestic hot water in the water heater 31. The condenser 3 is converted into an evaporator, and the refrigerant in the outer tube evaporates and absorbs heat, absorbing heat from the outdoor air and the cooling water. The circulating water pump 9 starts, and the cooling water absorbs the heat energy of the waste water and waste gas from the waste heat exchangers 13 and 14 and transfers it to the condenser 3.

[0028] When the outdoor condenser 3 in winter is frosted, the expansion throttle 35 is fully open and the expansion throttle 34 is closed. The heat pump system can defrost without stopping during the heating cycle. The refrigerant flow path is: compressor 1 → four-way reversing valve 2 → air-cooled evaporator 32 → expansion throttle 35 → condenser 3 → four-way reversing valve 2 → gas-liquid separator 6 → compressor 1. The cooling water flow path is: circulating water pump 9 → solenoid valve 18 → condenser 3 → solenoid valve 17, and then it divides into two paths. One path: water heater 31 → solenoid valve 30 → circulating water pump 9, and the other path: solenoid valve 22 → waste heat exchanger 14 (parallel solenoid valve 23 → waste heat exchanger 13) → circulating water pump 9. Finally, the two paths converge at the circulating water pump 9, and the defrosting heat absorption cycle loop completes one cycle. At this time, the solenoid valves 16 and 19 are closed. The cooling water absorbs the domestic hot water heat energy from the water heater 31, absorbs heat from the waste water and waste gas through the waste heat exchangers 13 and 14, circulates through the circulating water pump 9, and transfers the heat energy to the condenser 3. The refrigerant evaporates and absorbs the heat energy therein, reducing the heat absorbed from the air. Under the blowing of the condenser fan 7, the frost will gradually melt. At the same time, the air-cooled evaporator 32 sends hot air into the room without affecting the indoor heating. If the heat pump system stops running, the waste heat exchangers 13, 14, and the heat energy of the water heater 32 can be used to quickly defrost.

[0029] When it is necessary to separately produce hot water in any season, the heat pump system operates in the heating cycle. The expansion throttle 35 is closed and the expansion throttle 34 is fully open. The solenoid valve 30 is closed and the evaporator fan 8 stops. The refrigerant flow path is: compressor 1 → four-way reversing valve 2 → air-cooled evaporator 32 → water heater 31 → expansion throttle 34 → condenser 3 → four-way reversing valve 2 → gas-liquid separator 6 → compressor 1. The cooling water flow path is: circulating water pump 9 → solenoid valve 18 → condenser 3 → solenoid valve 17 → solenoid valve 22 → waste heat exchanger 14 (parallel solenoid valve 23 → waste heat exchanger 13) → circulating water pump 9. The heat absorption cycle loop completes one cycle. At this time, the solenoid valves 16, 19, and 30 are closed. The water heater 31 uses all the condensation heat of the refrigerant to heat the domestic hot water. The condenser 3 is converted into an evaporator, and the refrigerant in the outer tube evaporates and absorbs heat, absorbing heat from the outdoor air and the cooling water. The circulating water pump 9 starts, and the cooling water absorbs the heat energy of the waste water and waste gas from the waste heat exchangers 13 and 14 and transfers it to the condenser 3.

[0030] Figure 5In an air conditioning system with a shell-and-tube heat exchanger, it includes a refrigeration system and a water heat exchange system. Its characteristics are that the refrigeration system is a single-cooling system with a one-way circulation of refrigerant. It includes a condenser 3, an air-cooled evaporator 32, a water-cooled evaporator 36, a compressor 1, and an expansion throttle 4. The condenser 3 is a shell-and-tube heat exchanger. The inner tube passes cooling water and the outer tube passes refrigerant. The outer wall of the shell is a smooth tube or is finned. The condenser 3 acts as an outdoor unit to exchange heat with outdoor air. The air-cooled evaporator 32 acts as an indoor unit to exchange heat with indoor air. The water-cooled evaporator 36 exchanges heat with the cooling water. The water heat exchange system includes the inner tube of the condenser 3, the water-cooled evaporator 36, a water heater 15, waste heat exchangers 13, 14, circulation pumps 9, 10, expansion tanks 11, 12, solenoid valves 22, 23, 25, 26, 27, 28, 29. There are a condenser circulation pump 9 and an evaporator circulation pump 10 for the circulation pumps. The above-mentioned devices are connected to the inner tube of the condenser 3 and the water-cooled evaporator 36 to form a water heat exchange system. The inlet and outlet water pipelines of the inner tube of the condenser 3, the water heater 15, the waste heat exchangers 13, 14, the circulation pump 9, the expansion tank 11, and the solenoid valves 22, 23, 25, 28, 29 form a heat dissipation circulation loop to discharge the condensation heat. The inlet and outlet water pipelines of the inner tube of the condenser 3, the water heater 15, the circulation pump 9, the expansion tank 11, and the solenoid valve 29 form a hot water circulation loop. At the same time, the water-cooled evaporator 36, the waste heat exchangers 13, 14, the circulation pump 10, the expansion tank 12, and the solenoid valves 22, 23, 26, 27 form an endothermic circulation loop. The hot water circulation loop and the endothermic circulation loop are disconnected by the solenoid valves 25, 28 to utilize the condensation heat to heat the domestic hot water of the water heater 15. There is one or more waste heat exchangers 13, 14, which are connected in parallel in the water heat exchange system. They are water-water heat exchangers and water-air heat exchangers. The waste heat exchanger 13 is a water-air heat exchanger and the waste heat exchanger 14 is a water-water heat exchanger. The water heater 15 is a water-water heat exchanger. The waste heat exchangers 13, 14 and the water heater 15 are connected in parallel in the water heat exchange system and each is equipped with a solenoid valve. Through the circulation of the circulation pumps 9, 10, the waste water and waste gas exchange heat with the water in the water heat exchange system. The refrigerant exchanges heat in the condenser 3, the air-cooled evaporator 32, and the water-cooled evaporator 36, transferring the thermal energy of the waste water and waste gas and the condensation heat of the refrigerant to the condenser 3, the air-cooled evaporator 32, the water-cooled evaporator 36, and the water heater 15.

[0031] Since the refrigeration system is a single-cooling system with a year-round refrigeration cycle, the refrigerant flow path is: compressor 1 → condenser 3 → expansion throttle 4 → water-cooled evaporator 36 → air-cooled evaporator 32 → gas-liquid separator 6 → compressor 1. The cooling water flow path is: circulation pump 9 → condenser 3, and then it divides into two paths. One path: solenoid valve 29 → water heater 15 → circulation pump 9; the other path: solenoid valve 25 → solenoid valve 22 → waste heat exchanger 14 (parallel solenoid valve 23 → waste heat exchanger 13) → solenoid valve 28 → circulation pump 9. Finally, the two paths converge to circulation pump 9 to complete one cycle, and at this time, solenoid valves 26 and 27 are closed. The refrigerant in the air-cooled evaporator 32 evaporates and absorbs heat, sending cold air to the room. Circulation pump 10 stops, and there is no cooling water flowing through the water-cooled evaporator 36, so the refrigerant does not evaporate and absorb heat in it. The refrigerant in the outer tube of the condenser 3 condenses and releases heat. Circulation pump 9 starts, and the cooling water passes through the inner tube of the condenser 3, using the heat released by the refrigerant condensation to preferentially heat the domestic hot water of the water heater 15. The remaining heat released by the refrigerant condensation is discharged into wastewater and waste gas through waste heat exchangers 13 and 14, and heat is dissipated to the outdoor air through the outer tube of the condenser 3.

[0032] When only hot water needs to be produced separately in any season, the refrigerant circulation flow path remains unchanged, and the cooling water flow path is two-way circulation: One path, circulation pump 9 → condenser 3 → solenoid valve 29 → water heater 15 → circulation pump 9; the other path, circulation pump 10 → solenoid valve 26 → solenoid valve 22 → waste heat exchanger 14 (parallel solenoid valve 23 → waste heat exchanger 13) → solenoid valve 27 → water-cooled evaporator 36 → circulation pump 10. Solenoid valves 25 and 28 are closed. The refrigerant in the water-cooled evaporator 36 first evaporates and absorbs heat, and the remaining refrigerant evaporates and absorbs heat again in the air-cooled evaporator 32, sending cold air to the room. The cooling water absorbs the heat energy of wastewater and waste gas from waste heat exchangers 13 and 14 and transfers it to the water-cooled evaporator 36. In this way, the air-cooled evaporator 32 absorbs heat from the indoor air, and the water-cooled evaporator 36 absorbs heat from wastewater and waste gas. Through the refrigeration cycle, the heat released by the refrigerant condensation is transferred to the condenser 3. The condenser fan 7 does not operate, and the condenser 3 does not dissipate heat to the outdoor air. Through the circulation of circulation pump 9, all the heat released by the refrigerant condensation is used to heat the domestic hot water of the water heater 15.

[0033] Figure 6In an air conditioning system with a shell-and-tube heat exchanger, it includes a heat pump system and a water heat exchange system. The characteristics are as follows: The heat pump system includes a condenser 3, a water-cooled evaporator 37, a compressor 1, an expansion throttle 4, and a four-way reversing valve 2. The condenser 3 is a shell-and-tube heat exchanger, with cooling water flowing through the inner tube and refrigerant flowing through the outer tube. The outer wall of the shell is a smooth tube or is finned. The condenser 3 acts as an outdoor unit to exchange heat with outdoor air. The water-cooled evaporator 37 is a combination of a water-water heat exchanger and a water-refrigerant heat exchanger, and can adopt heat exchangers in the form of serpentine tubes, spiral tubes, shell tubes, etc. Its water-water heat exchanger is connected to the water heat exchange system, and its water-refrigerant heat exchanger is connected to the heat pump system, providing chilled and hot water for the air conditioning terminal, and is connected to a water heater 15 and provides a heat source. The water heat exchange system includes the inner tube of the condenser 3, the water-water heat exchanger of the water-cooled evaporator 37, the water heater 15, waste heat exchangers 13, 14, circulation pumps 9, 10, expansion tanks 11, 12, solenoid valves 16, 17, 18, 19, 20, 21, 22, 23, 24. There are a condenser circulation pump 9 and an evaporator circulation pump 10 for the circulation pumps. The above devices are connected to the inner tube of the condenser 3 and the water-water heat exchanger of the water-cooled evaporator 37 to form a water heat exchange system. The inlet and outlet water pipelines of the inner tube of the condenser 3 have two circuits, and each circuit is equipped with two solenoid valves 16, 19 and 17, 18 respectively, and is connected to the condenser circulation pump 9, the water heater 15, the waste heat exchangers 13, 14. By switching the solenoid valves 16, 19 and 17, 18, a heat dissipation circulation circuit or a heat absorption circulation circuit is formed. The water-water heat exchanger of the water-cooled evaporator 37 forms a hot water circulation circuit with the evaporator circulation pump 10, the water heater 15, and the solenoid valve 24, and is connected to the above heat absorption circulation circuit and heat dissipation circulation circuit through the solenoid valves 20, 21. There is one or more waste heat exchangers 13, 14, which are connected in parallel in the water heat exchange system. They are water-water heat exchangers and water-air heat exchangers. The waste heat exchanger 13 is a water-air heat exchanger, and the waste heat exchanger 14 is a water-water heat exchanger. The water heater 15 is a water-water heat exchanger. The waste heat exchangers 13, 14 and the water heater 15 are connected in parallel in the water heat exchange system and each is equipped with a solenoid valve. Through the circulation of the circulation pumps 9, 10, the waste water and waste gas exchange heat with the water in the water heat exchange system, and the refrigerant exchanges heat in the condenser 3 and the water-cooled evaporator 37, transferring the heat energy of the waste water and waste gas and the refrigerant condensation heat to the condenser 3, the water-cooled evaporator 37, and the water heater 15.

[0034] When the heat pump system is in the refrigeration cycle, the refrigerant flow path is: compressor 1 → four-way reversing valve 2 → condenser 3 → expansion throttle 4 → water-cooled evaporator 37 → four-way reversing valve 2 → gas-liquid separator 6 → compressor 1. The cooling water flow path is: circulating water pump 9 → solenoid valve 16 → condenser 3 → solenoid valve 19, and then it divides into two paths. One path: solenoid valve 20 → water heater 15 → solenoid valve 21 → circulating water pump 9. The other path: solenoid valve 22 → waste heat exchanger 14 (parallel solenoid valve 23 → waste heat exchanger 13) → circulating water pump 9. Finally, the two paths converge at the circulating water pump 9 to complete one cycle. At this time, solenoid valves 17, 18, and 24 are closed. The refrigerant in the water-cooled evaporator 37 evaporates and absorbs heat, providing chilled water for the air-conditioning terminal. The circulating water pump 10 stops, and there is no cooling water flowing in the pipe. The refrigerant in the outer pipe of the condenser 3 condenses and releases heat. The circulating water pump 9 starts, and the heat dissipation circulation loop begins to operate. The cooling water passes through the inner pipe of the condenser 3, using the refrigerant condensation heat to preferentially heat the domestic hot water of the water heater 15. The remaining refrigerant condensation heat is discharged into the waste water and waste gas through the waste heat exchangers 13 and 14, and heat is dissipated to the outdoor air through the outer pipe of the condenser 3.

[0035] When the heat pump system is in the heating cycle, the refrigerant flow path is: compressor 1 → four-way reversing valve 2 → water-cooled evaporator 37 → expansion throttle 4 → condenser 3 → four-way reversing valve 2 → gas-liquid separator 6 → compressor 1. The cooling water flow path has two cycles: circulating water pump 9 → solenoid valve 18 → condenser 3 → solenoid valve 17 → solenoid valve 22 → waste heat exchanger 14 (parallel solenoid valve 23 → waste heat exchanger 13) → circulating water pump 9. At this time, solenoid valves 16 and 19 are closed; circulating water pump 10 → solenoid valve 24 → water heater 15 → water-cooled evaporator 37 → circulating water pump 10. At this time, solenoid valves 20 and 21 are closed. The water-cooled evaporator 37 is converted into a condenser, and the refrigerant in the pipe condenses and releases heat, providing hot water for the air-conditioning terminal. At the same time, the circulating water pump 10 starts, and the hot water circulation loop begins to operate, using the refrigerant condensation heat to heat the domestic hot water of the water heater 15. The condenser 3 is converted into an evaporator, and the refrigerant in the outer pipe evaporates and absorbs heat from the outdoor air and the cooling water. The circulating water pump 9 starts, and the heat absorption circulation loop begins to operate. The cooling water absorbs the heat energy of the waste water and waste gas from the waste heat exchangers 13 and 14 and transfers it to the condenser 3.

[0036] When the outdoor condenser 3 frosts in winter, the heat pump system can defrost without stopping during the heating cycle. The refrigerant flow path is: compressor 1 → four-way reversing valve 2 → water-cooled evaporator 37 → expansion throttle 4 → condenser 3 → four-way reversing valve 2 → gas-liquid separator 6 → compressor 1. The cooling water flow path is: circulation water pump 9 → solenoid valve 18 → condenser 3 → solenoid valve 17, and then it divides into two paths. One path: solenoid valve 20 → water heater 15 → solenoid valve 21 → circulation water pump 9. The other path: solenoid valve 22 → waste heat exchanger 14 (parallel solenoid valve 23 → waste heat exchanger 13) → circulation water pump 9. Finally, the two paths converge at the circulation water pump 9 to complete one cycle. At this time, solenoid valves 16, 19, and 24 are closed. The condenser 3 is converted into an evaporator, and the refrigerant in the outer tube evaporates and absorbs heat from the outdoor air and the cooling water. The condenser circulation water pump 9 is started, and the heat absorption circulation loop starts to operate and is connected to the water heater 15 to form a defrosting circulation loop. The cooling water absorbs the thermal energy of domestic hot water from the water heater 15 and absorbs heat from the wastewater and waste gas through the waste heat exchangers 13 and 14, and circulates through the condenser circulation water pump 9 to transfer the thermal energy to the condenser 3. The refrigerant evaporates and absorbs the thermal energy therein, reducing the heat absorbed from the air. Under the blowing of the condenser fan 7, the frost will gradually melt. At the same time, the evaporator circulation water pump 10 stops, and the water-cooled evaporator 37 provides hot water for the air-conditioning terminal without affecting indoor heating. If the heat pump system stops operating, the thermal energy of the waste heat exchangers 13, 14, and the water heater 15 can be used to quickly defrost.

[0037] When it is necessary to separately produce hot water in any season, the heat pump system operates in the heating cycle. The refrigerant flow path is: compressor 1 → four-way reversing valve 2 → water-cooled evaporator 37 → expansion throttle 4 → condenser 3 → four-way reversing valve 2 → gas-liquid separator 6 → compressor 1. The cooling water flow path has two loops: circulation water pump 9 → solenoid valve 18 → condenser 3 → solenoid valve 17 → solenoid valve 22 → waste heat exchanger 14 (parallel solenoid valve 23 → waste heat exchanger 13) → circulation water pump 9. At this time, solenoid valves 16 and 19 are closed; circulation water pump 10 → solenoid valve 24 → water heater 15 → water-cooled evaporator 37 → circulation water pump 10. At this time, solenoid valves 20 and 21 are closed. The condenser 3 is converted into an evaporator, absorbing heat from the outdoor air and wastewater and waste gas. The heat absorption circulation loop starts to operate. The waste heat exchangers 13 and 14 absorb heat from the wastewater and waste gas and circulate through the condenser circulation water pump 9 to transfer the thermal energy to the condenser 3. The water-cooled evaporator 37 is converted into a condenser, and the refrigerant in the tube condenses and releases heat, stopping the supply of air-conditioning hot water. The evaporator circulation water pump 10 is started, and the hot water circulation loop starts to operate. At the same time, solenoid valves 20 and 21 connected to the heat absorption circulation loop are closed, and all the condensation heat of the refrigerant heats the domestic hot water of the water heater 15.

[0038] Figure 7In the air-conditioning system with a shell-and-tube heat exchanger, it includes a refrigeration system and a water heat exchange system. Its characteristics are as follows: The refrigeration system is a single-cooling system with a one-way circulation of refrigerant. It includes a condenser 3, a water-cooled evaporator 37, a compressor 1, and an expansion throttle 4. The condenser 3 is a shell-and-tube heat exchanger. The inner tube passes cooling water, and the outer tube passes refrigerant. The outer wall of the shell is a smooth tube or is finned. The condenser 3 serves as an outdoor unit to exchange heat with outdoor air. The water-cooled evaporator 37 is a combination of a water-water heat exchanger and a water-refrigerant heat exchanger, and heat exchangers in the forms of serpentine tubes, spiral tubes, shell tubes, etc. can be used. Its water-water heat exchanger is connected to the water heat exchange system, and its water-refrigerant heat exchanger is connected to the refrigeration system to provide chilled water for the air-conditioning terminal. The water heat exchange system includes the inner tube of the condenser 3, the water-water heat exchanger of the water-cooled evaporator 37, a water heater 15, waste heat exchangers 13 and 14, circulation pumps 9 and 10, expansion tanks 11 and 12, solenoid valves 22, 23, 25, 26, 27, 28, and 29. There are a condenser circulation pump 9 and an evaporator circulation pump 10 for the circulation pumps. The above-mentioned devices are connected to the inner tube of the condenser 3 and the water-water heat exchanger of the water-cooled evaporator 37 to form a water heat exchange system. The inlet and outlet water pipelines of the inner tube of the condenser 3, the water heater 15, the waste heat exchangers 13 and 14, the circulation pump 9, the expansion tank 11, and the solenoid valves 22, 23, 25, 28, and 29 form a heat dissipation circulation loop to discharge the condensation heat. The inlet and outlet water pipelines of the inner tube of the condenser 3, the water heater 15, the circulation pump 9, the expansion tank 11, and the solenoid valve 29 form a hot water circulation loop. At the same time, the water-water heat exchanger of the water-cooled evaporator 37, the waste heat exchangers 13 and 14, the circulation pump 10, the expansion tank 12, and the solenoid valves 22, 23, 26, and 27 form an endothermic circulation loop. The hot water circulation loop and the endothermic circulation loop are disconnected by the solenoid valves 25 and 28 to use the condensation heat to heat the domestic hot water of the water heater 15. There is one or more waste heat exchangers 13 and 14, which are connected in parallel in the water heat exchange system. They are water-water heat exchangers and water-air heat exchangers. The waste heat exchanger 13 is a water-air heat exchanger, and the waste heat exchanger 14 is a water-water heat exchanger. The water heater 15 is a water-water heat exchanger. The waste heat exchangers 13 and 14 are connected in parallel with the water heater 15 in the water heat exchange system and each is equipped with a solenoid valve. Through the circulation pumps 9 and 10, the waste water and waste gas exchange heat with the water in the water heat exchange system, and the refrigerant exchanges heat in the condenser 3 and the water-cooled evaporator 37, transferring the heat energy of the waste water and waste gas and the condensation heat of the refrigerant to the condenser 3, the water-cooled evaporator 37, and the water heater 15.

[0039] Since the refrigeration system is a single-cooling system with a year-round refrigeration cycle, the refrigerant flow path is: compressor 1 → condenser 3 → expansion throttle 4 → water-cooled evaporator 37 → gas-liquid separator 6 → compressor 1. The cooling water flow path is: circulating water pump 9 → condenser 3, and then it divides into two paths. One path: solenoid valve 29 → water heater 15 → circulating water pump 9. The other path: solenoid valve 25 → solenoid valve 22 → waste heat exchanger 14 (parallel solenoid valve 23 → waste heat exchanger 13) → solenoid valve 28 → circulating water pump 9. Finally, the two paths converge at the circulating water pump 9 to complete one cycle. At this time, solenoid valves 26 and 27 are closed. The refrigerant in the water-cooled evaporator 37 evaporates and absorbs heat, providing chilled water for the air-conditioning terminal. The circulating water pump 10 stops, and there is no cooling water flowing. The refrigerant in the outer tube of the condenser 3 condenses and releases heat. The circulating water pump 9 starts, and the cooling water passes through the inner tube of the condenser 3, using the refrigerant condensation heat to preferentially heat the domestic hot water of the water heater 15. The remaining refrigerant condensation heat is discharged into wastewater and waste gas through the waste heat exchangers 13 and 14, and dissipates heat to the outdoor air through the outer tube of the condenser 3.

[0040] When hot water needs to be produced separately in any season, the refrigerant circulation flow path remains unchanged. The cooling water flow path is two-way circulation: One path, circulating water pump 9 → condenser 3 → solenoid valve 29 → water heater 15 → circulating water pump 9; The other path, circulating water pump 10 → solenoid valve 26 → solenoid valve 22 → waste heat exchanger 14 (parallel solenoid valve 23 → waste heat exchanger 13) → solenoid valve 27 → water-cooled evaporator 37 → circulating water pump 10. Solenoid valves 25 and 28 are closed. The refrigerant in the tube of the water-cooled evaporator 37 evaporates and absorbs heat, providing chilled water for the air-conditioning terminal and absorbing heat from the room air. The cooling water absorbs the heat energy of wastewater and waste gas from the waste heat exchangers 13 and 14 and transfers it to the water-cooled evaporator 37. In this way, the water-cooled evaporator 37 absorbs heat from the indoor air and the cooling water, and through the refrigeration cycle, transfers the refrigerant condensation heat to the condenser 3, and then circulates through the circulating water pump 9. All the refrigerant condensation heat is used to heat the domestic hot water of the water heater 15. When the heat energy of wastewater and waste gas can meet the need to heat tap water, the water-cooled evaporator 37 does not provide chilled water for the air-conditioning terminal; when there is no wastewater, waste gas or their heat is insufficient, chilled water still needs to be provided for the air-conditioning terminal, and heat energy is obtained from the indoor air.

[0041] Figure 8 In it, the outdoor unit condenser 3 is L-shaped. The casing is made into a single-pass straight tube, which is convenient for passing through the fins. There are water collectors 38 at both ends, or it can be made into a double-pass U-shaped casing, just bend a straight tube into a U-shaped tube, which is also convenient for passing through the fins. The water collector 38 is installed at one end of the casing. The condenser fan 7 is an axial flow fan with front air outlet. This outdoor unit is suitable to be made into a wall-mounted unit. Equipment such as the circulating water pumps 9 and 10 can be concentrated indoors.

[0042] Figure 9Among them, the outdoor unit condenser 3 is U-shaped. The sleeve is made into a single-pass straight pipe or a double-pass U-shaped pipe. After the sleeve passes through the fins, it is bent into a U-shape. The condenser fan 7 is installed at the top of the outdoor unit, with air intake from the top and air outlet from the top. The condenser fan 7 uses an axial flow fan, a centrifugal fan or an external rotor EC fan. This outdoor unit has a relatively large power and is suitable for being placed on the ground or on a balcony or roof. Equipment such as the circulating pumps 9 and 10 can be centrally placed at the lower part of the outdoor unit to form an integrated unit, ensuring that the expansion tank is higher than the system.

[0043] Figure 10 Among them, the outdoor unit condenser 3 is V-shaped. The sleeve is made into a single-pass straight pipe or a double-pass U-shaped pipe. If it is made into a serpentine coil, it is advisable to use a smooth pipe or a pipe with discontinuous fins. After passing through the fins, it is then bent into a serpentine coil. The condenser fan 7 is installed at the top of the outdoor unit, with air intake from the top and air outlet from the top. The condenser fan 7 uses an axial flow fan, a centrifugal fan or an external rotor EC fan. This outdoor unit has a relatively large power and is suitable for being placed on the ground or on a balcony or roof. Equipment such as the circulating pumps 9 and 10 can be centrally placed at the lower part of the outdoor unit to form an integrated unit, ensuring that the expansion tank is higher than the system.

[0044] The above are only the preferred embodiments of the present invention and do not impose any form of limitation on the present invention. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention all fall within the protection scope of the present invention.

Claims

1. An air conditioning system with a shell-and-tube heat exchanger, which includes a heat pump system and a water heat exchange system, is characterized in that, The heat pump system includes a condenser, an evaporator, a compressor, an expansion throttle, and a four-way reversing valve. The condenser and the evaporator are double-pipe heat exchangers. The inner pipe passes cooling water, and the outer pipe passes refrigerant. The outer wall of the double pipe is a smooth pipe or is finned. The condenser serves as an outdoor unit to exchange heat with outdoor air, and the evaporator serves as an indoor unit to exchange heat with indoor air. The water heat exchange system includes the inner pipe of the condenser, the inner pipe of the evaporator, a water heater, a waste heat exchanger, a circulation pump, an expansion tank, and valves. The circulation pump includes a condenser circulation pump and an evaporator circulation pump. The above-mentioned devices are connected to the inner pipes of the condenser and the evaporator to form a water heat exchange system. The inlet and outlet water pipelines of the inner pipe of the condenser have two loops, each loop has two valves, and is connected to the condenser circulation pump, the water heater, and the waste heat exchanger. By switching the valves, a heat dissipation circulation loop or a heat absorption circulation loop is formed. The inlet and outlet water pipelines of the inner pipe of the evaporator form a hot water circulation loop with the evaporator circulation pump, the water heater, and the valves, and are connected to the above-mentioned heat absorption circulation loop and heat dissipation circulation loop through two valves. The waste heat exchanger exchanges heat with domestic wastewater and waste gas, and there is one or more, which are connected in parallel in the water heat exchange system. It is a water-water heat exchanger or a water-air heat exchanger. The water heater is a water-water heat exchanger. The waste heat exchanger and the water heater are connected in parallel in the water heat exchange system and each has a valve. By switching the valves, the flow direction of the cooling water in the inner pipes of the condenser and the evaporator is opposite to the flow direction of the refrigerant.

2. An air conditioning system with a shell-and-tube heat exchanger, which includes a refrigeration system and a water heat exchange system, is characterized in that, The refrigeration system is a single-cooling system, and the refrigerant circulates unidirectionally. It includes a condenser, an evaporator, a compressor, and an expansion throttle. The condenser and the evaporator are double-pipe heat exchangers. The inner pipe passes cooling water, and the outer pipe passes refrigerant. The outer wall of the double pipe is a smooth pipe or is finned. The condenser serves as an outdoor unit to exchange heat with outdoor air, and the evaporator serves as an indoor unit to exchange heat with indoor air. The water heat exchange system includes the inner pipe of the condenser, the inner pipe of the evaporator, a water heater, a waste heat exchanger, a circulation pump, an expansion tank, and valves. The circulation pump includes a condenser circulation pump and an evaporator circulation pump. The above-mentioned devices are connected to the inner pipes of the condenser and the evaporator to form a water heat exchange system. The inlet and outlet water pipelines of the inner pipe of the condenser, the water heater, the waste heat exchanger, the circulation pump, the expansion tank, and the valves form a heat dissipation circulation loop. The inlet and outlet water pipelines of the inner pipe of the condenser, the water heater, the circulation pump, the expansion tank, and the valves form a hot water circulation loop. At the same time, the inlet and outlet water pipelines of the inner pipe of the evaporator, the waste heat exchanger, the circulation pump, and the expansion tank form a heat absorption circulation loop. The hot water circulation loop and the heat absorption circulation loop are disconnected by two valves. There is one or more waste heat exchangers, which are connected in parallel in the water heat exchange system. It is a water-water heat exchanger or a water-air heat exchanger. The water heater is a water-water heat exchanger. The waste heat exchanger and the water heater are connected in parallel in the water heat exchange system and each has a valve. By switching the valves, the flow direction of the cooling water in the inner pipes of the condenser and the evaporator is opposite to the flow direction of the refrigerant.

3. An air conditioning system with a shell-and-tube heat exchanger, which comprises a heat pump system and a water heat exchange system, is characterized in that, The heat pump system includes a condenser, a water heater, an air-cooled evaporator, a compressor, an expansion throttle, a four-way reversing valve, and a three-way regulating valve. The condenser is a double-pipe heat exchanger. The inner pipe passes cooling water, and the outer pipe passes refrigerant. The outer wall of the double-pipe is a smooth pipe or is finned. The condenser acts as an outdoor unit to exchange heat with outdoor air, and the air-cooled evaporator acts as an indoor unit to exchange heat with indoor air; The water heat exchange system includes the inner pipe of the condenser, a water heater, a waste heat exchanger, a circulating water pump, an expansion tank, and valves. The above-mentioned devices are connected to the inner pipe of the condenser to form a water heat exchange system; The inlet and outlet water pipelines of the inner pipe of the condenser have two circuits, and each circuit has two valves. The inlet and outlet water pipelines of the inner pipe of the condenser, the condenser circulating water pump, the water heater, the waste heat exchanger, and the valves form a heat dissipation circulation circuit; The inlet and outlet water pipelines of the inner pipe of the condenser, the condenser circulating water pump, the waste heat exchanger, and the valves form an endothermic circulation circuit; There is one or more waste heat exchangers, which are connected in parallel in the water heat exchange system. They are water-water heat exchangers and water-air heat exchangers. The water heater is a combination of a water-water heat exchanger and a water-refrigerant heat exchanger. Its water-water heat exchanger is connected to the water heat exchange system, and its water-refrigerant heat exchanger is connected to the heat pump system and is connected in parallel with the air-cooled evaporator through a three-way regulating valve. The waste heat exchanger and the water heater are connected in parallel in the water heat exchange system and each has a valve. By switching the valves, the flow direction of the cooling water in the inner pipe of the condenser is opposite to the flow direction of the refrigerant.

4. An air conditioning system with a shell-and-tube heat exchanger, which includes a heat pump system and a water heat exchange system, is characterized in that, The heat pump system includes a condenser, a water heater, an air-cooled evaporator, a compressor, an expansion throttle, and a four-way reversing valve. The condenser is a double-pipe heat exchanger. The inner pipe passes cooling water, and the outer pipe passes refrigerant. The outer wall of the double-pipe is a smooth pipe or is finned. The condenser acts as an outdoor unit to exchange heat with outdoor air, and the air-cooled evaporator acts as an indoor unit to exchange heat with indoor air. Two expansion throttles are connected in parallel in the heat pump system. One expansion throttle is connected in series with the water heater and the air-cooled evaporator in the heat pump system, and the other expansion throttle is connected in parallel with this expansion throttle and the water heater. The other expansion throttle is connected in series with the air-cooled evaporator in the heat pump system and is connected in parallel with the water heater; The water heat exchange system includes the inner pipe of the condenser, a water heater, a waste heat exchanger, a circulating water pump, an expansion tank, and valves. The above-mentioned devices are connected to the inner pipe of the condenser to form a water heat exchange system; The inlet and outlet water pipelines of the inner pipe of the condenser have two circuits, and each circuit has two valves. The inlet and outlet water pipelines of the inner pipe of the condenser, the condenser circulating water pump, the water heater, the waste heat exchanger, and the valves form a heat dissipation circulation circuit; The inlet and outlet water pipelines of the inner pipe of the condenser, the condenser circulating water pump, the waste heat exchanger, and the valves form an endothermic circulation circuit; There is one or more waste heat exchangers, which are connected in parallel in the water heat exchange system. They are water-water heat exchangers and water-air heat exchangers. The water heater is a combination of a water-water heat exchanger and a water-refrigerant heat exchanger. Its water-water heat exchanger is connected to the water heat exchange system, and its water-refrigerant heat exchanger is connected to the heat pump system. The waste heat exchanger and the water heater are connected in parallel in the water heat exchange system and each has a valve. By switching the valves, the flow direction of the cooling water in the inner pipe of the condenser is opposite to the flow direction of the refrigerant.

5. An air-conditioning system with a shell-and-tube heat exchanger, which comprises a refrigeration system and a water heat exchange system, is characterized in that, The refrigeration system is a single-cooling system with a one-way circulation of refrigerant. It includes a condenser, an air-cooled evaporator, a water-cooled evaporator, a compressor, and an expansion throttle. The condenser is a double-pipe heat exchanger. The inner pipe passes cooling water, and the outer pipe passes refrigerant. The outer wall of the double-pipe is a smooth tube or is finned. The condenser exchanges heat with outdoor air as an outdoor unit. The air-cooled evaporator exchanges heat with indoor air as an indoor unit. The water-cooled evaporator exchanges heat with cooling water; The water heat exchange system includes the inner pipe of the condenser, the water-cooled evaporator, a water heater, a waste heat exchanger, a circulating water pump, an expansion tank, and valves. The circulating water pump includes a condenser circulating water pump and an evaporator circulating water pump. The above-mentioned devices are connected to the inner pipe of the condenser and the water-cooled evaporator to form a water heat exchange system; The inlet and outlet water pipelines of the inner pipe of the condenser, the water heater, the waste heat exchanger, the circulating water pump, the expansion tank, and the valves form a heat dissipation circulation loop. The inlet and outlet water pipelines of the inner pipe of the condenser, the water heater, the circulating water pump, the expansion tank, and the valves form a hot water circulation loop. At the same time, the water-cooled evaporator, the waste heat exchanger, the circulating water pump, the expansion tank, and the valves form an endothermic circulation loop. The hot water circulation loop and the endothermic circulation loop are disconnected by two valves; There is one or more waste heat exchangers, which are connected in parallel in the water heat exchange system. It is a water-water heat exchanger or a water-air heat exchanger. The water heater is a water-water heat exchanger. The waste heat exchanger and the water heater are connected in parallel in the water heat exchange system and each is equipped with a solenoid valve.

6. An air conditioning system with a shell-and-tube heat exchanger, which comprises a heat pump system and a water heat exchange system, is characterized in that, The heat pump system includes a condenser, a water-cooled evaporator, a compressor, an expansion throttle, and a four-way reversing valve. The condenser is a double-pipe heat exchanger. The inner pipe passes cooling water, and the outer pipe passes refrigerant. The outer wall of the double-pipe is a smooth tube or is finned. The condenser exchanges heat with outdoor air as an outdoor unit. The water-cooled evaporator is a combination of a water-water heat exchanger and a water-refrigerant heat exchanger. Its water-water heat exchanger is connected to the water heat exchange system, and its water-refrigerant heat exchanger is connected to the heat pump system; The water heat exchange system includes the inner pipe of the condenser, the water-water heat exchanger of the water-cooled evaporator, a water heater, a waste heat exchanger, a circulating water pump, an expansion tank, and valves. The circulating water pump includes a condenser circulating water pump and an evaporator circulating water pump. The above-mentioned devices are connected to the inner pipe of the condenser and the water-water heat exchanger of the water-cooled evaporator to form a water heat exchange system; The inlet and outlet water pipelines of the inner pipe of the condenser have two loops, each loop has two valves, and is connected to the condenser circulating water pump, the water heater, and the waste heat exchanger. By switching the valves, a heat dissipation circulation loop or an endothermic circulation loop is formed. The water-water heat exchanger of the water-cooled evaporator, the evaporator circulating water pump, the water heater, and the valves form a hot water circulation loop, and are connected to the above-mentioned endothermic circulation loop and heat dissipation circulation loop through two valves; There is one or more waste heat exchangers, which are connected in parallel in the water heat exchange system. It is a water-water heat exchanger or a water-air heat exchanger. The water heater is a water-water heat exchanger. The waste heat exchanger and the water heater are connected in parallel in the water heat exchange system and each is equipped with a valve. By switching the valves, the flow direction of the cooling water in the inner pipe of the condenser and the water-cooled evaporator is opposite to the flow direction of the refrigerant.

7. An air conditioning system with a shell-and-tube heat exchanger, which includes a refrigeration system and a water heat exchange system, is characterized in that, The refrigeration system is a single-cooling system with a one-way circulation of the refrigerant. It includes a condenser, a water-cooled evaporator, a compressor, and an expansion throttle. The condenser is a double-pipe heat exchanger. The inner pipe passes cooling water, and the outer pipe passes the refrigerant. The outer wall of the double-pipe is a smooth pipe or is finned. The condenser serves as the outdoor unit for heat exchange with the outdoor air. The water-cooled evaporator is a combination of a water-water heat exchanger and a water-refrigerant heat exchanger. Its water-water heat exchanger is connected to the water heat exchange system, and its water-refrigerant heat exchanger is connected to the refrigeration system. The water heat exchange system includes the inner pipe of the condenser, the water-water heat exchanger of the water-cooled evaporator, a water heater, a waste heat exchanger, a circulation pump, an expansion tank, and valves. The circulation pump includes a condenser circulation pump and an evaporator circulation pump. The above-mentioned devices are connected to the inner pipe of the condenser and the water-water heat exchanger of the water-cooled evaporator to form a water heat exchange system. The inlet and outlet water pipelines of the inner pipe of the condenser, the water heater, the waste heat exchanger, the circulation pump, the expansion tank, and the valves form a heat dissipation circulation loop. The inlet and outlet water pipelines of the inner pipe of the condenser, the water heater, the circulation pump, the expansion tank, and the valves form a hot water circulation loop. At the same time, the water-water heat exchanger of the water-cooled evaporator, the waste heat exchanger, the circulation pump, the expansion tank, and the valves form an endothermic circulation loop. The hot water circulation loop and the endothermic circulation loop are disconnected by two valves. There is one or more waste heat exchangers, which are connected in parallel in the water heat exchange system. They are water-water heat exchangers and water-air heat exchangers. The water heater is a water-water heat exchanger. The waste heat exchanger and the water heater are connected in parallel in the water heat exchange system and each is equipped with a valve.

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