CN206739681U - Big temperature difference Double-head heat pump based on heat source tower Yu underground pipe cooperation - Google Patents

Abstract

The utility model relates to a large temperature difference double-head heat pump system based on the combined operation of heat source towers and buried pipes, which includes two independent heat pump systems, a combined operation system of heat source towers and buried pipes, and users. The two independent The heat pump system includes a condenser and an evaporator, the condensers are connected through condenser pipes, and the evaporators are connected through evaporator pipes. The utility model connects the countercurrent condenser and evaporator of the heat pump unit in series, and combines the operation of the large temperature difference between the heat source tower and the buried pipe. No matter in the refrigeration working condition or the heat pump working condition, the ratio of the condensation pressure and the evaporation pressure of each system is different from that of the traditional one. Compared with the heat pump system, there is a greater reduction, so that the performance coefficient is greatly improved.

Description

Large temperature difference double-head heat pump system based on joint operation of heat source tower and buried pipe

【Technical field】

The utility model relates to a large temperature difference double-head heat pump system based on the combined operation of a heat source tower and an underground pipe, and belongs to the technical field of design and manufacture of refrigeration and air-conditioning systems.

【Background technique】

my country's hot summer and cold winter regions involve parts of 14 provinces (municipalities) including Shanghai, Jiangsu, Zhejiang, Anhui, Fujian, Jiangxi, Hubei, Hunan, Chongqing, Sichuan, and Guizhou provinces (municipalities). Its climate is characterized by hot summer, cold and humid winter, and high air humidity. At present, there are mainly three traditional cooling/heating methods for large buildings in this area: water-cooled chillers + boilers; water/ground source heat pumps and air-cooled heat pumps. Air-cooled heat pumps can provide cooling/heating at the same time, but the energy efficiency of cooling/heating is relatively low; water/ground source heat pumps can simultaneously provide cooling/heating with high efficiency, but are limited by the geographical environment and high initial investment. The water-cooled chiller + boiler cooling/heating mode has high operating efficiency in summer, while boiler heating is used in winter, and the primary energy utilization rate is low; with the comprehensive promotion and development of energy saving and emission reduction, the heat source tower heat pump system is rapidly developing in this area. Developed, the heat source tower is converted into a cooling tower in summer to realize the cooling of the unit. In winter, the heat source tower absorbs heat from the air, releases the heat to the evaporator, and provides heat to users through the condenser.

Compared with the traditional water-cooled chiller + boiler and air-cooled heat pump, the heat source tower heat pump system has lower initial investment and operating costs, but its energy efficiency is lower than that of the ground source heat pump.

【Content of utility model】

The purpose of this utility model is: aiming at the deficiencies of the prior art, this utility model proposes a large temperature difference double-head heat pump system based on the joint operation of the heat source tower and the buried pipe, and makes full use of the buried pipe to obtain a higher temperature in winter. The temperature of the cold water can be lower in summer. Through the joint operation of the heat source tower and the buried pipe, based on the large temperature difference double-head series counterflow heat pump unit, on the one hand, the large temperature difference can reduce the heat pump system. The power consumption of the water pump, on the other hand, the way of large temperature difference, double heads in series and reverse flow can realize the heat exchange of the heat source tower and the buried pipe can be well utilized, and the energy efficiency of the unit is greatly improved.

For realizing above-mentioned object, the technical scheme that the utility model adopts is:

A large temperature difference double-head heat pump system based on the combined operation of heat source towers and buried pipes described in the utility model includes two independent heat pump systems, a joint operation system of heat source towers and buried pipes, and users. An independent heat pump system, that is, heat pump system one and heat pump system two, both include a condenser and an evaporator, the condensers are connected through condenser pipes, and the evaporators are connected through evaporator pipes; wherein in refrigeration In this mode, one of the condensers is connected to the heat source tower through pipelines, the heat source tower is connected to the buried pipe, and the other condenser is connected after releasing heat through the buried pipe, and the evaporator of the one of them is connected to the user through pipelines. After being used by the user, it is connected to another evaporator through a pipeline to complete the cold water cycle; in the heating mode, one of the condensers is connected to the user through a pipeline, and after being used by the user, it is connected to the other condenser through a pipeline to complete the heating cycle. Water circulation, one of the evaporators is connected to the heat source tower for heat exchange through pipelines, the heat source tower is connected to the buried pipe, and the other evaporator is connected after heat exchange through the buried pipe.

In the utility model: the heat pump system one includes a compressor one, a condenser one, a dry filter one, an economizer one, an electronic expansion valve one and an evaporator one, and the high-temperature and high-pressure refrigerant gas is discharged from the compressor one The gas port is discharged into condenser 1, and the high-temperature and high-pressure refrigerant gas is condensed into normal-temperature and high-pressure refrigerant liquid, and the normal-temperature and high-pressure refrigerant liquid flows into dry filter 1, and the normal-temperature and high-pressure refrigerant is divided into three paths at the outlet of dry filter 1, and part of the refrigerant Flow into the suction port of compressor 1 through solenoid valve 2 and throttle valve 2, and another part of refrigerant enters the auxiliary side of economizer 1 through solenoid valve 1 and throttle valve 1, and then flows into the economizer interface of compressor 1, Most of the refrigerant passes through the solenoid valve 3 through the main side of the economizer 1, and flows into the electronic expansion valve 1. The normal temperature and high pressure refrigerant liquid is throttled into a low temperature and low pressure gas-liquid mixture and enters the evaporator 1. The low temperature and low pressure refrigerant liquid is evaporating. It boils in the first compressor, turns into a low-temperature and low-pressure refrigerant gas, and then flows back to the suction port of the first compressor.

In the utility model: the heat pump system 2 includes a compressor 2, a condenser 2, a dry filter 2, an economizer 2, an electronic expansion valve 2 and an evaporator 2, and the high-temperature and high-pressure refrigerant gas flows from the compressor 2 The exhaust port is discharged into the second condenser, and the high-temperature and high-pressure refrigerant gas is condensed into a normal-temperature and high-pressure refrigerant liquid, and the normal-temperature and high-pressure refrigerant liquid flows into the second dry filter, and the normal temperature and high-pressure refrigerant is divided into three paths at the second outlet of the dry filter, and part of the refrigeration The refrigerant flows into the suction port of compressor 2 through solenoid valve 5 and throttle valve 4, and the other part of refrigerant enters the auxiliary side of economizer 2 through solenoid valve 4 and throttle valve 3, and then flows into the economizer interface of compressor 2 , most of the final refrigerant passes through the solenoid valve six through the main side of the economizer two, and flows into the electronic expansion valve two. The liquid boils in the second evaporator, turns into a low-temperature and low-pressure refrigerant gas, and then flows back to the suction port of the second compressor.

In the utility model: the heat pump system 1 and the heat pump system 2 adopt the double head series counterflow method with large temperature difference. Under the cooling condition, the condensation temperature of the condenser 1 is low; High temperature.

In the utility model: the outlet of the second condenser is provided with a cooling water pump; the outlet of the first evaporator is provided with a refrigerant water pump.

In the utility model: the combined operation system of the heat source tower and the buried pipe includes the heat source tower and the buried pipe, the heat source tower and the buried pipe are connected by pipelines, and the buried pipe is fixed with the heat source tower Adjacent to each other, in order to improve the heat exchange efficiency of the buried pipe and reduce the transmission loss between the heat source tower and the buried pipe.

After adopting the above structure, the beneficial effects of the utility model are as follows:

1. The system of this utility model has a simple structure and a reasonable design. Through the heat pump unit connected in series with the countercurrent condenser and evaporator, combined with the large temperature difference operation between the heat source tower and the buried pipe, no matter in refrigeration or heat pump conditions, each Compared with the traditional heat pump system, the ratio of condensing pressure and evaporating pressure of the system is greatly reduced, so that the performance coefficient is greatly improved;

2. The low-temperature spray liquid enthalpy-increasing technology and the economizer heat exchange technology of the heat pump unit in this utility model greatly improve the heating efficiency and heating capacity of the heat pump unit during winter operation by matching the heat source tower and the buried pipe for joint operation;

3. The joint operation technology of the heat source tower and the buried pipe in this utility model can realize the energy balance of the soil heat exchange of the buried pipe through comprehensive control of the cold and heat load of the buried pipe in winter and summer; under the condition of large temperature difference, it can greatly Reduce the operating flow of the system and reduce the power consumption of the water pump.

【Description of drawings】

The accompanying drawings described here are used to provide a further understanding of the utility model and constitute a part of the application, but do not constitute an improper limitation of the utility model. In the accompanying drawings:

Fig. 1 is the connection schematic diagram of heat pump system 1 and heat pump system 2 in the utility model;

Fig. 2 is a schematic diagram of the system of the utility model in refrigeration mode;

Fig. 3 is a schematic diagram of the system of the utility model in heating mode.

In the figure: 1. Compressor 1; 2. Condenser 1; 3. Dry filter 1; 4. Economizer 1; 5. Electronic expansion valve 1; 6. Evaporator 1; 7. Compressor 2; 8. Condensation Device two; 9. Dry filter two; 10. Economizer two; 11. Electronic expansion valve two; 12. Evaporator two; 13. Solenoid valve one; 14. Throttle valve one; 15. Solenoid valve two; 16. Throttle valve two; 17. Solenoid valve three; 18. Solenoid valve four; 19. Throttle valve three; 20. Solenoid valve five; 21. Throttle valve four; 22. Solenoid valve six; 23. Condenser pipeline; 24 .evaporator pipeline; 25. heat source tower; 26. buried pipe; 27. user; 28. cooling water pump; 29. refrigerant water pump.

【detailed description】

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments, wherein the schematic embodiments and descriptions are only used to explain the utility model, but not as a limitation to the utility model.

As shown in Figure 1-3, a large temperature difference dual-head heat pump system based on the joint operation of heat source towers and buried pipes includes two independent heat pump systems, a joint operation system of heat source towers and buried pipes, and users 27. The two independent heat pump systems described above, that is, heat pump system one and heat pump system two, both include a condenser and an evaporator, and the condensers are connected through a condenser pipeline 23, and the evaporators are connected through an evaporator pipeline 24 In the refrigeration mode, one of the condensers is connected to the heat source tower 25 through a pipeline, and the heat source tower 25 is connected to the buried pipe 26, and the other condenser is connected after the heat release through the buried pipe 26, and the one of the One evaporator is connected to the user 27 through a pipeline, and after being used by the user 27, it is connected to the other evaporator through a pipeline to complete the cold water cycle; in the heating mode, one of the condensers is connected to the user 27 through a pipeline, and the user 27 27 After use, connect another condenser through a pipeline to complete the hot water cycle. One of the evaporators is connected to the heat source tower 25 for heat exchange through a pipeline, and the heat source tower 25 is connected to the buried pipe 26. After heat exchange through the buried pipe 26 Connect another evaporator.

The heat pump system-comprises a compressor-1, a condenser-2, a dry filter-3, an economizer-4, an electronic expansion valve-5 and an evaporator-6, and the high-temperature and high-pressure refrigerant gas flows from the compressor-1 The exhaust port is discharged into the condenser-2, and the high-temperature and high-pressure refrigerant gas is condensed into a normal-temperature and high-pressure refrigerant liquid, and the normal-temperature and high-pressure refrigerant liquid flows into the drying filter-3, and the normal-temperature and high-pressure refrigerant is divided into three paths at the outlet of the drying filter-3 , a part of refrigerant flows into the suction port of compressor one 1 through solenoid valve two 15 and throttle valve two 16, and another part of refrigerant enters the auxiliary side of economizer one through solenoid valve one 13 and throttle valve one 14, and then Flowing into the economizer interface of compressor 1, most of the refrigerant passes through the solenoid valve 3 17 through the main side of the economizer 4, and flows into the electronic expansion valve 1 5, and the normal temperature and high pressure refrigerant liquid is throttled to become a low temperature and low pressure gas-liquid The mixture enters the evaporator-6, and the low-temperature and low-pressure refrigerant liquid boils in the evaporator-6, turns into a low-temperature and low-pressure refrigerant gas and flows back to the suction port of the compressor-1.

The heat pump system two includes a compressor two 7, a condenser two 8, a dry filter two 9, an economizer two 10, an electronic expansion valve two 11 and an evaporator two 12, and the high-temperature and high-pressure refrigerant gas flows from the compressor two 7 The exhaust port is discharged into the condenser II 8, the high-temperature and high-pressure refrigerant gas is condensed into a normal temperature and high pressure refrigerant liquid, and the normal temperature and high pressure refrigerant liquid flows into the drying filter II 9, and the normal temperature and high pressure refrigerant is divided into three paths at the outlet of the drying filter II 9 A part of the refrigerant flows into the suction port of the compressor II 7 through the solenoid valve V 20 and the throttle valve IV 21, and the other part of the refrigerant enters the auxiliary side of the economizer II 10 through the electromagnetic valve IV 18 and the throttle valve III 19, and then Flow into the economizer port of compressor II 7, and most of the final refrigerant passes through the main side of the economizer II 10 through the solenoid valve VI 22, and flows into the electronic expansion valve II 11, and the normal temperature and high pressure refrigerant liquid throttling becomes low temperature and low pressure The gas-liquid mixture enters the evaporator 2 12, and the low-temperature and low-pressure refrigerant liquid boils in the evaporator 2 12, becomes a low-temperature and low-pressure refrigerant gas, and then flows back to the suction port of the compressor 2 7 .

The heat pump system 1 and the heat pump system 2 adopt a double-head series counterflow method with a large temperature difference. Under the cooling condition, the condensation temperature of the condenser 12 is low, and under the heating condition, the evaporation temperature of the evaporator 12 is high; The outlet of the second condenser 8 is provided with a cooling water pump 28; the outlet of the first evaporator 6 is provided with a refrigerant water pump 29.

The combined operation system of the heat source tower and buried pipe includes a heat source tower 25 and a buried pipe 26, the heat source tower 25 and the buried pipe 26 are connected by pipelines, and the buried pipe 26 is fixed with prefabricated cement and connected with the heat source tower 25 Adjacent to each other, in order to improve the heat exchange efficiency of the buried pipe 26 and reduce the transmission loss between the heat source tower 25 and the buried pipe 26 .

During specific implementation, under refrigeration mode: cooling water at 25°C enters from the inlet of condenser one 2, the outlet of condenser one 2 is connected to condenser two 8 through condenser pipe 23, and cooling water at 35°C passes through the outlet of condenser two 8 The cooling water pump 28 flows into and enters the inlet of the heat source tower 25 through the pipeline; the 35°C high-temperature cooling water passes through the heat source tower 25 to reduce the heat exchange temperature to 30°C, and then enters the buried pipe 26; Released into the soil, the temperature is lowered to 25°C, and then enters the inlet of condenser 1 to complete the cooling water cycle. The cold water at 12°C enters from the evaporator 2 12, and the evaporator 12 is connected to the evaporator 1 6 through the evaporator pipe 24. After the temperature drops to 7°C, it flows out from the outlet of the evaporator 1 6 and enters the user 27 side to provide cooling capacity for the user 27 The cold water at 12°C flows from the user 27 into the entrance of the evaporator 2 12 to complete the cold water cycle.

In heating mode: 40°C hot water enters from the inlet of condenser 1 2, the outlet of condenser 1 2 is connected to condenser 2 8 through condenser pipe 23, 45°C hot water flows in from the outlet of condenser 2 8 and It enters the user side through the pipeline to provide heat for the user 27; 40°C hot water backwater flows into the inlet of the condenser-2 to complete the hot water cycle. The low-temperature solution of 5°C enters from the evaporator 12, and the evaporator 12 is connected with the evaporator 6 through the evaporator pipeline 24, and after the temperature drops to -5°C, it flows out from the outlet of the evaporator 6 and enters the inlet of the heat source tower 25;- The low-temperature solution at 5°C exchanges heat through the heat source tower 25 and absorbs the heat of the air. After the temperature rises to 0°C, it enters the buried pipe 26, exchanges heat in the buried pipe 26, absorbs the heat in the soil, and the temperature further rises to 5°C and then enters the inlet of evaporator II 12 to complete the circulation of the low-temperature solution.

The above is only a preferred embodiment of the utility model, so all equivalent changes or modifications made according to the structure, features and principles described in the utility model patent application scope are all included in the utility model patent application scope .

Claims (6)

1. A large temperature difference dual-head heat pump system based on the combined operation of heat source towers and buried pipes, characterized in that it includes two independent heat pump systems, a joint operation system of heat source towers and buried pipes, and users. An independent heat pump system, that is, heat pump system one and heat pump system two, both include a condenser and an evaporator, the condensers are connected through condenser pipes, and the evaporators are connected through evaporator pipes; wherein in refrigeration In this mode, one of the condensers is connected to the heat source tower through pipelines, the heat source tower is connected to the buried pipe, and the other condenser is connected after releasing heat through the buried pipe, and the evaporator of the one of them is connected to the user through pipelines. After being used by the user, it is connected to another evaporator through a pipeline to complete the cold water cycle; in the heating mode, one of the condensers is connected to the user through a pipeline, and after being used by the user, it is connected to the other condenser through a pipeline to complete the heating cycle. Water circulation, one of the evaporators is connected to the heat source tower for heat exchange through pipelines, the heat source tower is connected to the buried pipe, and the other evaporator is connected after heat exchange through the buried pipe. 2. According to claim 1, the large temperature difference double-head heat pump system based on the joint operation of the heat source tower and the buried pipe is characterized in that: the heat pump system includes a compressor, a condenser, a dry filter, Economizer 1, electronic expansion valve 1 and evaporator 1, the high-temperature and high-pressure refrigerant gas is discharged from the exhaust port of compressor 1 into condenser 1, and the high-temperature and high-pressure refrigerant gas is condensed into a normal temperature and high pressure refrigerant liquid, and the normal temperature and high pressure refrigerant liquid Flowing into the dry filter 1, the normal temperature and high pressure refrigerant is divided into three paths at the outlet of the dry filter 1, part of the refrigerant flows into the suction port of the compressor 1 through the solenoid valve 2 and the throttle valve 2, and the other part of the refrigerant passes through the solenoid valve 1 1. Throttle valve 1 enters the auxiliary side of economizer 1, and then flows into the economizer interface of compressor 1. Most of the refrigerant passes through solenoid valve 3, passes through the main side of economizer 1, and flows into electronic expansion valve 1. The normal temperature and high pressure refrigerant The liquid throttling becomes a low-temperature and low-pressure gas-liquid mixture and enters the evaporator 1, and the low-temperature and low-pressure refrigerant liquid boils in the evaporator 1, turns into a low-temperature and low-pressure refrigerant gas, and then flows back to the suction port of the compressor 1. 3. The large temperature difference double-head heat pump system based on the joint operation of the heat source tower and the buried pipe according to claim 1, characterized in that: the heat pump system 2 includes a compressor 2, a condenser 2, and a dry filter 2 , economizer 2, electronic expansion valve 2 and evaporator 2, the high-temperature and high-pressure refrigerant gas is discharged from the exhaust port of the compressor 2 into the condenser 2, and the high-temperature and high-pressure refrigerant gas is condensed into a normal temperature and high pressure refrigerant liquid, and the normal temperature and high pressure refrigerant gas The liquid flows into the dry filter 2, and the normal temperature and high pressure refrigerant is divided into three paths at the outlet of the dry filter 2, part of the refrigerant flows into the suction port of the compressor 2 through the solenoid valve 5 and throttle valve 4, and the other part of the refrigerant passes through the solenoid valve 4. Throttle valve 3 enters the auxiliary side of economizer 2, and then flows into the economizer interface of compressor 2. Finally, most of the refrigerant passes through solenoid valve 6, passes through the main side of economizer 2, and flows into electronic expansion valve 2. The high-pressure refrigerant liquid throttling turns into a low-temperature and low-pressure gas-liquid mixture and enters the second evaporator. The low-temperature and low-pressure refrigerant liquid boils in the second evaporator, becomes a low-temperature and low-pressure refrigerant gas, and then flows back to the suction port of the second compressor. 4. According to claim 3, the large temperature difference double-head heat pump system based on the joint operation of the heat source tower and the buried pipe is characterized in that: the outlet of the second condenser is provided with a cooling water pump. 5. The large temperature difference double-head heat pump system based on the joint operation of the heat source tower and the buried pipe according to claim 2, wherein the outlet of the first evaporator is provided with a refrigerant water pump. 6. According to claim 1, the large temperature difference double-head heat pump system based on the joint operation of heat source towers and buried pipes is characterized in that: the joint operation system of heat source towers and buried pipes includes heat source towers and buried pipes, The heat source tower and the buried pipe are connected by pipes, and the buried pipe is fixed with prefabricated cement and arranged adjacent to the heat source tower, so as to improve the heat exchange efficiency of the buried pipe and reduce the transmission loss between the heat source tower and the buried pipe .