Air / sewage source coupling efficient heat pump system

Abstract

The utility model provides an air / sewage source coupling efficient heat pump system, which belongs to the technical field of heating and comprises an air source heat pump unit, a sewage source heat pump unit and a waterway system, and the air source heat pump unit and the sewage source heat pump unit are in coupling connection through the waterway system. The air source heat pump unit comprises an air cooling evaporator, a first compressor, a first two-fluid condenser and a first throttling valve, and the sewage source heat pump unit comprises a three-fluid evaporator, a second compressor, a second two-fluid condenser and a second throttling valve. An air source is independently adopted for heat supply; when the air temperature is low and sewage supply is sufficient, the sewage source heat pump is used for supplying heat independently; when the air temperature is low and the sewage supply is insufficient, the air source and sewage source cascade coupling heat supply is adopted.

Description

Technical Field

[0001] This utility model relates to the field of heating technology, and in particular to an air / sewage source coupled high-efficiency heat pump system. Background Technology

[0002] Wastewater source heat pumps, due to the relatively high temperature of the low-temperature wastewater heat source, offer high system efficiency and generally eliminate defrosting issues; therefore, wastewater source heat pump heating is considered one of the future trends in municipal heating. However, wastewater supply exhibits significant temporal and geographical characteristics, with nighttime supply being significantly lower than daytime supply. In residential areas far from sewage networks or sparsely populated suburbs, insufficient wastewater supply can also occur. During these periods, using a single wastewater source for heating requires complex water replenishment plans, reducing the energy efficiency and economy of wastewater source heat pumps. Insufficient water replenishment can even reduce the reliability of the entire heating system, leading to inadequate heating for residents and impacting their quality of life. Furthermore, during a considerable period of the heating season, outdoor ambient temperatures are high, during which air source heat pumps generally offer higher energy efficiency and economy than wastewater source heat pumps. Summary of the Invention

[0003] The purpose of this invention is to provide an air / sewage source coupled high-efficiency heat pump system that can flexibly couple an air source heat pump system with a sewage source heat pump system. During the heating season, when the temperature is high enough that the air source heat pump is more efficient than the sewage source heat pump, air source heating is used alone; when the temperature is low and sewage supply is sufficient, sewage source heat pump is used alone for heating; when the temperature is low and sewage supply is insufficient, a cascaded coupling of air and sewage sources is used for heating, with the air source heat pump producing some low-temperature hot water as a supplement to the low-temperature heat source of the sewage source heat pump, thus ensuring that the entire heating system operates at a high efficiency level in all scenarios.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] An air / sewage source coupled high-efficiency heat pump system is characterized by comprising an air source heat pump unit, a sewage source heat pump unit, and a water system, wherein the air source heat pump unit and the sewage source heat pump unit are coupled and connected through the water system.

[0006] The air source heat pump unit includes an air-cooled evaporator, a first compressor, a first two-fluid condenser, and a first throttling valve. One end of the air-cooled evaporator is connected to one end of the first compressor, and the other end of the air-cooled evaporator is connected to the throttling valve. The other end of the first compressor is connected to one end of the first two-fluid condenser, and the other end of the first two-fluid condenser is connected to the throttling valve.

[0007] The wastewater source heat pump unit includes a three-fluid evaporator, a second compressor, a second two-fluid condenser, and a second throttle valve. One end of the three-fluid evaporator is connected to one end of the second compressor, and the other end of the three-fluid evaporator is connected to the second throttle valve. The other end of the second compressor is connected to one end of the second two-fluid condenser, and the other end of the second two-fluid condenser is connected to the second throttle valve.

[0008] Furthermore, the air-cooled evaporator is a finned tube evaporator, the first two-fluid condenser and the second two-fluid condenser are shell-and-tube, shell-and-tube or plate heat exchanger refrigerant-water heat exchangers, and the three-fluid evaporator is a shell-and-tube or wide-channel refrigerant-water heat exchanger. The different fluids in the first two-fluid condenser, the second two-fluid condenser and the three-fluid evaporator cannot come into contact.

[0009] Furthermore, the first two-fluid condenser includes a first fluid passage and a second fluid passage, wherein the first fluid passage contains air source heat pump refrigerant and the second fluid passage contains water.

[0010] Furthermore, the three-fluid evaporator includes a third fluid passage, a fourth fluid passage, and a fifth fluid passage. The third fluid passage contains refrigerant from a wastewater source heat pump unit, the fourth fluid passage contains a heat pump unit that produces hot water, and the fifth fluid passage is connected to a wastewater source.

[0011] Furthermore, the second two-fluid condenser includes a sixth fluid passage and a seventh fluid passage. The sixth fluid passage contains refrigerant from a wastewater source heat pump unit, and the seventh fluid passage contains water-generating equipment from a wastewater source heat pump unit.

[0012] Furthermore, the water system includes a water pump, a first three-way valve, a second three-way valve, and a third three-way valve. The first three-way valve includes a first three-way valve outlet 1, a first three-way valve outlet 2, and a first three-way valve outlet 3. The first three-way valve outlet 1 is connected to the water pump, the first three-way valve outlet 3 is connected to a fourth fluid passage, the fourth fluid passage is connected to a second fluid passage, and the second fluid passage is connected to the water pump.

[0013] The second three-way valve includes a first outlet of the second three-way valve, a second outlet of the second three-way valve, and a third outlet of the second three-way valve. The first outlet of the second three-way valve is connected to the second outlet of the first three-way valve, the second outlet of the second three-way valve is connected to the seventh fluid passage, and the third outlet of the second three-way valve is connected to the user end outlet.

[0014] The third three-way valve includes a third three-way valve outlet 1, a third three-way valve outlet 2, and a third three-way valve outlet 3. The third three-way valve outlet 1 is connected to the second fluid passage, the third three-way valve outlet 2 is connected to the seventh fluid passage, and the third three-way valve outlet 3 is connected to the user end inlet.

[0015] Advantages of this utility model:

[0016] 1. Optimal energy efficiency for good economic performance. In winter, when temperatures are low and wastewater source heat pumps are highly efficient, wastewater source heat pumps are used; when temperatures are high and air source heat pumps are highly efficient, air source heat pumps are used. The unit always operates at a high level of economic efficiency / energy performance.

[0017] 2. Multi-energy complementarity to ensure heating supply. Due to policy or economic considerations, some areas mainly need to use sewage source heat pumps. However, sewage source supply has strong time characteristics, with less supply at night. In addition, sewage source supply is also less in some newly developed areas. In this case, using air source heat pumps to produce some medium and low temperature hot water to supplement the low temperature heat source of sewage source heat pumps can effectively ensure heating supply.

[0018] 3. Component coupling simplifies the system. The three modes actually only use two systems, coupled by a heat exchanger and sharing a portion of the water flow path, simplifying the system and reducing overall cost. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the system flow of this utility model;

[0020] Figure 2 This is a schematic diagram of the process of the sewage source heat pump supplying heat to users separately in this utility model;

[0021] Figure 3 This is a schematic diagram of the process of the air source heat pump and sewage source heat pump coupled to supply heat to users in this utility model.

[0022] Figure 4 This is a schematic diagram of the process by which the air source heat pump of this utility model supplies heat to users independently;

[0023] In the diagram: 11. Air-cooled evaporator; 12. First compressor; 13. First two-fluid condenser; 131. First fluid passage; 132. Second fluid passage; 14. First throttle valve.

[0024] 21. Three-fluid evaporator; 211. Third fluid passage; 212. Fourth fluid passage; 213. Fifth fluid passage; 22. Second compressor; 23. Second two-fluid condenser; 231. Sixth fluid passage; 232. Seventh fluid passage; 24. Second throttle valve.

[0025] 31. Water pump; 32. First three-way valve; 321. First three-way valve outlet 1; 322. First three-way valve outlet 2; 323. First three-way valve outlet 3; 33. Second three-way valve; 331. Second three-way valve outlet 1; 332. Second three-way valve outlet 2; 333. Second three-way valve outlet 3; 34. Third three-way valve; 341. Third three-way valve outlet 1; 342. Third three-way valve outlet 2; 343. Third three-way valve outlet 3. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model.

[0027] like Figure 1 As shown, an air / sewage source coupled high-efficiency heat pump system includes an air source heat pump unit, a sewage source heat pump unit, and a water system, wherein the air source heat pump unit and the sewage source heat pump unit are coupled and connected through the water system.

[0028] The air source heat pump unit includes an air-cooled evaporator 11, a first compressor 12, a first two-fluid condenser 13, and a first throttling valve 14. One end of the air-cooled evaporator 11 is connected to one end of the first compressor 12, and the other end of the air-cooled evaporator 11 is connected to the throttling valve 14. The other end of the first compressor 12 is connected to one end of the first two-fluid condenser 13, and the other end of the first two-fluid condenser 13 is connected to the throttling valve 14.

[0029] The wastewater source heat pump unit includes a three-fluid evaporator 21, a second compressor 22, a second two-fluid condenser 23, and a second throttle valve 24. One end of the three-fluid evaporator 21 is connected to one end of the second compressor 22, and the other end of the three-fluid evaporator 21 is connected to the second throttle valve 24. The other end of the second compressor 22 is connected to one end of the second two-fluid condenser 23, and the other end of the second two-fluid condenser 23 is connected to the second throttle valve 24.

[0030] In a preferred embodiment of this utility model, the air-cooled evaporator 11 is a finned tube evaporator, the first two-fluid condenser 13 and the second two-fluid condenser 23 are shell-and-tube, shell-and-tube or plate heat exchanger refrigerant-water heat exchangers, and the three-fluid evaporator 21 is a shell-and-tube or wide-channel refrigerant-water heat exchanger. The different fluids in the first two-fluid condenser 13, the second two-fluid condenser 23 and the three-fluid evaporator 21 cannot come into contact.

[0031] In a preferred embodiment of the present invention, the first two-fluid condenser 13 includes a first fluid passage 131 and a second fluid passage 132. The first fluid passage 131 is filled with air source heat pump refrigerant, and the second fluid passage 132 is filled with water.

[0032] In a preferred embodiment of the present invention, the three-fluid evaporator 21 includes a third fluid passage 211, a fourth fluid passage 212 and a fifth fluid passage 213. The third fluid passage 211 is filled with refrigerant from a sewage source heat pump unit, the fourth fluid passage 212 is filled with a heat pump unit from an air source to produce hot water, and the fifth fluid passage 213 is connected to a sewage source.

[0033] In a preferred embodiment of the present invention, the second two-fluid condenser 23 includes a sixth fluid passage 231 and a seventh fluid passage 232. The sixth fluid passage 231 is provided with refrigerant from a sewage source heat pump unit, and the seventh fluid passage 232 is provided with hot water prepared by a sewage source heat pump unit.

[0034] In a preferred embodiment of the present invention, the water system includes a water pump 31, a first three-way valve 32, a second three-way valve 33, and a third three-way valve 34. The first three-way valve 32 includes a first three-way valve outlet 321, a first three-way valve outlet 322, and a first three-way valve outlet 323. The first three-way valve outlet 321 is connected to the water pump 31, and the first three-way valve outlet 323 is connected to a fourth fluid passage 212. The fourth fluid passage 212 is connected to a second fluid passage 132, and the second fluid passage 132 is connected to the water pump 31.

[0035] The second three-way valve 33 includes a first outlet 331, a second outlet 332, and a third outlet 333. The first outlet 331 is connected to the second outlet 322 of the first three-way valve, the second outlet 332 is connected to the seventh fluid passage 232, and the third outlet 333 is connected to the user end outlet.

[0036] The third three-way valve 34 includes a first outlet 341, a second outlet 342, and a third outlet 343. The first outlet 341 is connected to the second fluid passage 132, the second outlet 342 is connected to the seventh fluid passage 232, and the third outlet 343 is connected to the user end inlet.

[0037] As a preferred embodiment of this utility model, T amb For ambient temperature, T sew The wastewater supply temperature is ΔT, where ΔT is the ambient / water temperature difference. Figure 2 As shown, when T is detected amb <T sew When the sewage source is sufficient (△T), the air source heat pump unit shuts down, and only the sewage source heat pump unit operates. At this time, water pump 31 shuts down, the first three-way valve 32 closes its outlet 321, the second three-way valve 33 closes its outlet 331, and the third three-way valve 34 closes its outlet 341, thus only the sewage source heat pump supplies heat to the user. Because the sewage source temperature is significantly higher than the ambient temperature at this time, using the sewage source heat pump for heating is more energy efficient; therefore, this embodiment offers better operational economy.

[0038] As a preferred embodiment of this utility model, such as Figure 3 As shown, when T is detected amb <T sew When the sewage source is insufficient, the air source heat pump unit and the sewage source heat pump unit start. At this time, the water pump 31 starts, the first three-way valve 32 closes the second outlet 322 of the first three-way valve, the second three-way valve 33 closes the first outlet 331 of the second three-way valve, and the third three-way valve 34 closes the first outlet 341 of the third three-way valve. Some hot water produced by the air source heat pump flows into the third fluid passage 212 of the sewage source heat pump three-fluid evaporator 21 as a low-temperature heat source supplement, improving the heating capacity of the sewage source heat pump unit. The sewage source heat pump unit starts, and finally, the air source heat pump and the sewage source heat pump are coupled to supply heat to the user. Because the sewage source temperature is much higher than the ambient temperature at this time, the overall energy efficiency of using the sewage source heat pump for heating is better. However, insufficient sewage supply will affect the heating stability of the system. At this time, using the air source heat pump to produce some low-temperature hot water as a sewage source supplement can ensure system stability while taking into account energy efficiency.

[0039] As a preferred embodiment of this utility model, such as Figure 4 As shown, when T is detected amb >T sewAt time -△T, the air source heat pump unit starts up, and the wastewater source heat pump unit stops. At this time, water pump 31 starts up, the first three-way valve 32 closes its outlet 323, the second three-way valve 33 closes its outlet 332, and the third three-way valve 34 closes its outlet 342. The air source heat pump then supplies heat to the user independently. Because the ambient temperature is high enough at this time, the energy efficiency of the air source heat pump is superior to that of the wastewater source heat pump. Therefore, this embodiment offers better operational economy.

[0040] The value of △T needs to be calculated in advance to ensure that the ambient temperature of the air source heat pump unit is T. sew The energy efficiency or economy of the unit operating at temperatures of -△T and above is greater than or equal to that of the wastewater source heat pump unit. sew -△T serves as a criterion for determining the heating method used; when the ambient temperature is higher than T... sew When the ambient temperature is below T, an air-source heat pump is used for separate heating; when the ambient temperature is below T... sew When -△T and the sewage source is sufficient, the sewage source is used for separate heating; however, when the ambient temperature is lower than T... sew When the sewage source is insufficient, air source heat pump and sewage source heat pump are coupled for heating to ensure that the entire system has stable heating and always operates at the highest energy efficiency.

[0041] This system can be configured with a wastewater source flow and ambient temperature detection system. The wastewater source flow monitoring system determines whether the wastewater supply is sufficient, and the ambient temperature monitoring system determines the difference between the ambient temperature and the wastewater source temperature. The two factors are combined to determine which heating mode to use.

[0042] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Those skilled in the art can still adjust the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Therefore, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalents, the present utility model also intends to include these modifications and variations.

Claims

1. A high-efficiency heat pump system coupled with an air / sewage source, characterized in that: It includes an air source heat pump unit, a wastewater source heat pump unit, and a water system, wherein the air source heat pump unit and the wastewater source heat pump unit are coupled and connected through the water system; The air source heat pump unit includes an air-cooled evaporator (11), a first compressor (12), a first two-fluid condenser (13), and a first throttle valve (14). One end of the air-cooled evaporator (11) is connected to one end of the first compressor (12), and the other end of the air-cooled evaporator (11) is connected to the throttle valve (14). The other end of the first compressor (12) is connected to one end of the first two-fluid condenser (13), and the other end of the first two-fluid condenser (13) is connected to the throttle valve (14). The wastewater source heat pump unit includes a three-fluid evaporator (21), a second compressor (22), a second two-fluid condenser (23), and a second throttle valve (24). One end of the three-fluid evaporator (21) is connected to one end of the second compressor (22), and the other end of the three-fluid evaporator (21) is connected to the second throttle valve (24). The other end of the second compressor (22) is connected to one end of the second two-fluid condenser (23), and the other end of the second two-fluid condenser (23) is connected to the second throttle valve (24).

2. The air / sewage source coupled high-efficiency heat pump system according to claim 1, characterized in that: The air-cooled evaporator (11) is a finned tube evaporator, the first two-fluid condenser (13) and the second two-fluid condenser (23) are shell-and-tube, shell-and-tube or plate heat exchanger refrigerant-water heat exchangers, and the three-fluid evaporator (21) is a shell-and-tube or wide-channel refrigerant-water heat exchanger. The different fluids in the first two-fluid condenser (13), the second two-fluid condenser (23) and the three-fluid evaporator (21) cannot come into contact.

3. The air / sewage source coupled high-efficiency heat pump system according to claim 2, characterized in that: The first two-fluid condenser (13) includes a first fluid passage (131) and a second fluid passage (132). The first fluid passage (131) contains air source heat pump refrigerant, and the second fluid passage (132) contains water.

4. The air / sewage source coupled high-efficiency heat pump system according to claim 3, characterized in that: The three-fluid evaporator (21) includes a third fluid passage (211), a fourth fluid passage (212), and a fifth fluid passage (213). The third fluid passage (211) contains a refrigerant from a sewage source heat pump unit, the fourth fluid passage (212) contains an air source heat pump unit that produces hot water, and the fifth fluid passage (213) is connected to a sewage source.

5. The air / sewage source coupled high-efficiency heat pump system according to claim 4, characterized in that: The second two-fluid condenser (23) includes a sixth fluid passage (231) and a seventh fluid passage (232). The sixth fluid passage (231) is equipped with a refrigerant from a sewage source heat pump unit, and the seventh fluid passage (232) is equipped with a sewage source heat pump unit for producing hot water.

6. The air / sewage source coupled high-efficiency heat pump system according to claim 5, characterized in that: The water system includes a water pump (31), a first three-way valve (32), a second three-way valve (33), and a third three-way valve (34). The first three-way valve (32) includes a first three-way valve outlet 1 (321), a first three-way valve outlet 2 (322), and a first three-way valve outlet 3 (323). The first three-way valve outlet 1 (321) is connected to the water pump (31), and the first three-way valve outlet 3 (323) is connected to a fourth fluid passage (212). The fourth fluid passage (212) is connected to a second fluid passage (132), and the second fluid passage (132) is connected to the water pump (31). The second three-way valve (33) includes a first outlet (331), a second outlet (332), and a third outlet (333). The first outlet (331) is connected to the second outlet (322), the second outlet (332) is connected to the seventh fluid passage (232), and the third outlet (333) is connected to the user outlet. The third three-way valve (34) includes a third three-way valve outlet 1 (341), a third three-way valve outlet 2 (342), and a third three-way valve outlet 3 (343). The third three-way valve outlet 1 (341) is connected to the second fluid passage (132), the third three-way valve outlet 2 (342) is connected to the seventh fluid passage (232), and the third three-way valve outlet 3 (343) is connected to the user end inlet.

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