CN204494908U - A kind of soil source heat pump system from environment heat-obtaining - Google Patents

Abstract

The invention relates to a soil source heat pump system which obtains heat from the environment, belonging to the field of heating and air conditioning. The system adds the first heat exchanger, the second heat exchanger, the second heat exchanger water pump, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve and The seventh valve forms the heating or cooling mode of the ground source heat pump, the heat supplement mode of the second heat exchanger heat pump, the direct supplement heat mode of the second heat exchanger and the direct supplement heat mode of the second heat exchanger, which can provide winter heating, Air conditioning in summer, domestic hot water throughout the year and supplementary heating during non-heating periods. The utility model solves the soil heat imbalance problem of the conventional soil source heat pump system in the northern region with low initial investment, low operating energy consumption and simple system connection form, has high energy saving and economical efficiency, and contributes to the soil source heat pump Reasonable promotion and application of the system in the northern region.

Description

A ground source heat pump system that takes heat from the environment

technical field

The utility model relates to a soil source heat pump system for obtaining heat from the environment, which belongs to the field of heat supply and air conditioning. This technology can effectively solve the soil heat imbalance problem of the soil source heat pump system in the northern region, and maintain the stable and efficient operation of the system for many years. It is especially suitable for the northern region where the building heat load is large and dry and lack of water.

Background technique

The northern region of my country mainly adopts the centralized heating method based on fossil fuel combustion. The overall energy efficiency of this method is not high, resulting in a large energy consumption, and the emission of pollutants exacerbates the appearance of smog to a certain extent. Ground source heat pumps use soil as low-level energy, and the system performance is less affected by temperature and has strong adaptability. As a clean and efficient form of heating and air conditioning, it has been more and more widely used in my country in recent years. But the thermal imbalance of soil is the key problem restricting its performance and development. When the ground source heat pump is applied to buildings with heat loads in the northern region, the annual accumulative heat intake of the system from the soil is significantly greater than the heat output, which will cause the soil temperature to drop, and then the system performance will decline, or even fail to operate. In the existing solutions, increasing the number of buried pipes and increasing the distance between buried pipes will increase the initial investment and can only slow down the drop in soil temperature, but cannot fundamentally solve the problem of soil thermal imbalance; adding solar collectors as an auxiliary Equipment will bring higher initial investment and poor operational reliability.

Therefore, exploring a solution to the soil heat imbalance problem of the soil source heat pump system in the northern region with high economy and energy saving will help to promote the reasonable promotion and application of the soil source heat pump in the northern region and replace fossil fuels. Combustion heating is of great significance to energy saving and emission reduction.

Utility model content

Based on the above problems, this utility model proposes a soil source heat pump system that draws heat from the environment. The system can provide heating in winter, air conditioning in summer, domestic hot water throughout the year, and heat supplement in non-heating seasons, solving the problem of soil source heat pump systems in northern regions. To solve the problem of soil heat imbalance, maintain the long-term stable and efficient operation of the system.

The technical scheme of the utility model is as follows:

A soil source heat pump system that draws heat from the environment, including heat pump units, buried pipes, users, ground source side water collectors, ground source side water separators, ground source side water pumps, user side water pumps, user side water separators , the first valve and the water collector on the user side; the outlet on the user side of the heat pump unit is sequentially connected to the water pump on the user side, the water separator on the user side, the first valve, the user and the water collector on the user side to return to the user side of the heat pump unit, forming The heating and cooling circuit on the user side of the heat pump unit; the outlet on the ground source side of the heat pump unit is sequentially connected to the ground source side water collector, the buried pipe, the ground source side water separator and the ground source side water pump to return to the ground source side of the heat pump unit, Constitute the heating and cooling circuit on the ground source side of the heat pump unit; it is characterized in that: the ground source heat pump system that takes heat from the environment also includes a first heat exchanger, a second heat exchanger, a water pump for the second heat exchanger, a second valve, the third valve, the fourth valve, the fifth valve, the sixth valve and the seventh valve; the user-side outlet of the heat pump unit of the first heat exchanger is sequentially connected to the user-side water collector, the user-side of the heat pump unit, and the user-side The side water pump, the user-side water separator and the second valve return to the first heat exchanger to form the user-side circuit of the heat pump unit of the first heat exchanger; the user-side outlet of the second heat exchanger is connected to the third valve in sequence 1. The second heat exchanger side of the first heat exchanger and the second heat exchanger water pump return to the second heat exchanger to form the second heat exchanger heat pump heat supplement circuit; the user side of the second heat exchanger The outlet is sequentially connected to the sixth valve, the water collector on the ground source side, the buried pipe, the water separator on the ground source side, the seventh valve, and the water pump of the second heat exchanger to return to the second heat exchanger to form the direct flow of the second heat exchanger. Supplementary heat circuit; the user-side outlet of the second heat exchanger is sequentially connected to the fourth valve, the ground source side of the heat pump unit, the fifth valve, and the water pump of the second heat exchanger back to the second heat exchanger, forming the second heat exchanger The heater directly feeds the heating circuit.

In the above technical solution, the ground source heat pump system that obtains heat from the environment is characterized in that: the heat pump unit adopts two modes of switching on the refrigerant side or switching on the external waterway side under the switching mode of cooling and heating. a structural form. The second heat exchanger adopts one or a combination of air-cooled heat exchangers, solar heat collectors and solution spray heat exchangers.

The utility model has the following advantages and beneficial effects:

The utility model adds a second heat exchanger on the basis of the conventional soil source heat pump, and the system can realize various operation modes according to the change of the outdoor air temperature and the load characteristics. In summer or winter, the conventional soil source heat pump system discharges or extracts heat from the soil to provide users with air conditioning, heating and domestic hot water. In the non-heating season, when the outdoor air temperature is high, the second heat exchanger can take heat from the environment, heat up the soil after the heat pump unit raises the temperature, and realize the second heat exchanger heat pump heat supplement mode; when the outdoor air temperature is further When the temperature rises or the solar radiation is strong, the second heat exchanger can directly take heat from the environment to replenish heat to the soil, realizing the direct heat supplement mode of the second heat exchanger. When domestic hot water needs to be supplied during the non-heating period, the second heat exchanger can be used to obtain heat from the environment, and heat can be supplied to the user after the heat pump unit raises the temperature to realize the heat pump heat supply of the second heat exchanger to meet the domestic hot water demand of the user , greatly reducing heat pump units from the ground heat. At the beginning and end of heating, when the outdoor air temperature is high or the solar radiation is strong, the second heat exchanger can be used to obtain heat from the environment, and the heat pump unit can raise the temperature to supply heat to the user, realizing the heat supply mode of the second heat exchanger heat pump. Meet the heating needs of users. The heat pump heating mode of the second heat exchanger reduces the system’s heat extraction from the ground and reduces the annual heat imbalance of the soil; at the same time, due to the high air temperature or strong solar radiation, the temperature of the water outlet of the second heat exchanger may be lower than that of the second heat exchanger. The outlet water temperature of the buried tube heat exchanger is high, so the heat supply mode of the second heat exchanger heat pump has higher energy efficiency than the conventional ground source heat pump. Compared with conventional technology: ① Due to the addition of the second heat exchanger as auxiliary equipment, the required initial investment is low, and the pipeline connection form is simple, suitable for new or renovated ground source heat pump projects; ② The second heat exchanger heat pump The heat supply mode can reduce the system’s heat extraction from the soil, and at the same time, the second heat exchanger’s direct supplementary heat mode and the second heat exchanger’s heat pump supplementary heat mode can increase the supplementary heat to the soil, so that the annual heat intake of the soil is equal to that of the soil. "Supplementary heat + exhaust heat" is basically equal, which effectively solves the problem of soil heat imbalance in buildings with heat loads in northern regions, and ensures the long-term reliable operation of soil source heat pumps; ③The second heat exchanger It can make full use of the thermal energy in the air or solar energy for supplementary heating or direct heating, and the system has less energy consumption and lower operating costs. Compared with the heating method of traditional fossil fuel combustion, it has higher primary energy efficiency and obvious energy saving.

In general, the utility model solves the soil heat imbalance problem of the conventional soil source heat pump system in the northern region with low initial investment, low operating energy consumption and simple system connection form, and has high energy saving and economical efficiency. Contribute to the rational promotion and application of the ground source heat pump system in the northern region.

Description of drawings

Fig. 1 is a schematic structural diagram of a ground source heat pump system for obtaining heat from the environment provided by the utility model.

Fig. 2 is a schematic diagram of the heating or cooling mode of the soil source heat pump system provided by the utility model for obtaining heat from the environment.

Fig. 3 is a schematic diagram of the second heat exchanger heat pump heat supplement mode of the soil source heat pump system that takes heat from the environment provided by the utility model.

Fig. 4 is a schematic diagram of the direct supplementary heat mode of the second heat exchanger of the soil source heat pump system provided by the utility model to obtain heat from the environment.

Fig. 5 is a schematic diagram of the heat supply mode of the second heat exchanger heat pump of the soil source heat pump system that takes heat from the environment provided by the utility model.

Among them: 1-user; 2-first heat exchanger; 3-third valve; 4-second heat exchanger; 5-second heat exchanger water pump; 6-fourth valve; 7-fifth valve; 8 - the sixth valve; 9- water collector on the ground source side; 10- buried pipe; 11- the seventh valve; 12- water separator on the ground source side; 13- water pump on the ground source side; 14- heat pump unit; Side water pump; 16-user side water separator; 17-user side water collector; 18-first valve; 19-second valve.

Detailed ways

Below in conjunction with accompanying drawing, structure and operation mode of the present utility model are further described.

Fig. 1 is a schematic diagram of the structure of the soil source heat pump system provided by the utility model to obtain heat from the environment, including a heat pump unit 14, a buried pipe 10, a user 1, a water collector 9 on the ground source side, and a water separator 12 on the ground source side , ground source side water pump 13, user side water pump 15, user side water distributor 16, first valve 18 and user side water collector 17; the outlet of the user side of the heat pump unit 14 is connected to the user side water pump 15, user side distributor The water tank 16, the first valve 18, the user 1 and the water collector 17 on the user side return to the user side of the heat pump unit 14 to form a heating and cooling circuit on the user side of the heat pump unit; the outlets on the ground source side of the heat pump unit 14 are sequentially connected to the ground source The side water collector 9, the buried pipe 10, the ground source side water distributor 12 and the ground source side water pump 13 return to the ground source side of the heat pump unit 14 to form a heating and cooling circuit on the ground source side of the heat pump unit; The hot ground source heat pump system also includes a first heat exchanger 2, a second heat exchanger 4, a second heat exchanger water pump 5, a second valve 19, a third valve 3, a fourth valve 6, a fifth valve 7, The sixth valve 8 and the seventh valve 11; the user-side outlet of the heat pump unit of the first heat exchanger 2 is sequentially connected to the user-side water collector 17, the user-side of the heat pump unit 14, the user-side water pump 15, and the user-side water separator 16 and the second valve 19 return to the first heat exchanger 2 to form the user-side circuit of the heat pump unit of the first heat exchanger; the user-side outlet of the second heat exchanger 4 is sequentially connected to the third valve 3 and the first The second heat exchanger side of the heat exchanger 2 and the second heat exchanger water pump 5 return to the second heat exchanger 4 to form a second heat exchanger heat pump heat supplement circuit; the user of the second heat exchanger 4 The side outlet is sequentially connected to the sixth valve 8, the ground source side water collector 9, the buried pipe 10, the ground source side water separator 12, the seventh valve 11 and the second heat exchanger water pump 5 back to the second heat exchanger 4 , constituting the direct supplementary heat circuit of the second heat exchanger; the user-side outlet of the second heat exchanger 4 is sequentially connected to the fourth valve 6, the ground source side of the heat pump unit 14, the fifth valve 7 and the water pump of the second heat exchanger 5 returns to the second heat exchanger 4 to form the direct heating circuit of the second heat exchanger.

In the above-mentioned ground source heat pump system that takes heat from the environment, the heat pump unit 14 adopts two structural forms: switching on the refrigerant side or switching on the external waterway side in the switching mode of cooling and heating. The second heat exchanger 4 adopts one or a combination of air-cooled heat exchangers, solar heat collectors and solution spray heat exchangers.

The soil source heat pump system that takes heat from the environment described in the utility model can realize the following independent operation modes:

a. Ground source heat pump heating or cooling mode: When the user has heating, domestic hot water or cooling demand, and the second heat exchanger does not meet the operating conditions, close the second valve 19, the third valve 3, and the second heat exchanger. Four valves 6, fifth valve 7, sixth valve 8, seventh valve 11 and the second heat exchanger water pump 5; water from the buried pipe 10 enters the heat pump unit 14 through the ground source side water separator 12 and the ground source side water pump 13 The ground source side provides low-level heat source or cold source for the heat pump unit 14, and then returns to the buried pipe 10 through the ground source side water collector 9; the user return water enters the heat pump unit 14 user side through the user side water collector 17 to be heated or cool down, and then return to the user 1 through the user-side water pump 15, the user-side water separator 16 and the first valve 18, and use the soil source heat pump for heating, domestic hot water or cooling;

b. The heat supplement mode of the second heat exchanger heat pump: when the outdoor air temperature in the non-heating period is high, and the user has no demand for domestic hot water at this moment, close the first valve 18, the fourth valve 6, and the fifth valve 7 , the sixth valve 8 and the seventh valve 11, the user 1 stops heating or cooling; the user side of the second heat exchanger 4 exchanges heat with the environment to produce hot water and enters the first heat exchanger 2 through the third valve 3 The second heat exchanger side releases heat, and then returns to the second heat exchanger 4 through the second heat exchanger water pump 5; the user-side outlet water of the heat pump unit 14 passes through the user-side water pump 15, the user-side water separator 16 and the second The valve 19 enters the user side of the heat pump unit of the first heat exchanger 2 to be heated, and then returns to the user side of the heat pump unit 14 to release heat through the user-side water collector 17; The water pump 13 on the ground source side enters the heat pump unit 14 to be heated on the ground source side, and then returns to the buried pipe 10 through the ground source side water collector 9; in this mode, the second heat exchanger 4 is combined with the heat pump unit 14 to realize The heat is taken from the environment, and the temperature is raised by the heat pump unit to replenish heat to the soil; in this mode, the outdoor temperature is relatively high, the heat pump unit has a high energy efficiency ratio, and it also has the characteristics of high supplementary water temperature and large supplementary heat;

c. Second heat exchanger direct heat supplement mode: when the outdoor air temperature in the non-heating period further increases or the solar radiation is strong, close the first valve 18, the second valve 19, the third valve 3, and the fourth valve 6 , the fifth valve 7, the user side water pump 15, the ground source side water pump 13, and the heat pump unit 14 stop running; the water from the buried pipe 10 enters through the ground source side water separator 12, the seventh valve 11, and the second heat exchanger water pump 5 The user side of the second heat exchanger 4 is heated, and then returns to the buried pipe 10 through the sixth valve 8 and the ground source side water collector 9; in this mode, the outdoor air temperature is higher than that of mode b or the solar radiation is stronger , the second heat exchanger 4 can directly obtain more convective or radiant heat from the environment to produce hot water at a higher temperature, and directly replenish heat to the soil without passing through the heat pump unit 14, which has a higher energy efficiency ratio than mode b.

d. The second heat exchanger heat pump heating mode: at the beginning and end of heating or non-heating period, when the outdoor air temperature is high or the solar radiation is strong, the second valve 19, the third valve 3, the sixth valve 8, and the second valve are closed. The seven valves 11, the water pump 13 on the ground source side, and the underground pipe 10 stop running; the user side of the second heat exchanger 4 exchanges heat with the environment to produce hot water and enters the heat pump unit 14 to release heat on the ground source side through the fourth valve 6. Then, return to the second heat exchanger 4 through the fifth valve 7 and the second heat exchanger water pump 5; the user return water passes through the user side water collector 17 to the user side of the heat pump unit 14 to be heated, and then passes through the user side water pump 15, The user-side water distributor 16 and the first valve 18 return to the user 1 . At the beginning and end of heating, the second heat exchanger 4 is used to obtain heat from the environment and heat is supplied to the user 1 after the heat pump unit 14 raises the temperature, which can reduce the heat taken by the system from the soil and slow down the phenomenon of soil thermal imbalance; in addition, especially at the end of heating , after the heat extraction throughout the heating season, the outlet water temperature of the buried pipe 10 is relatively low, while the second heat exchanger 4 is used to extract heat from the environment to produce hot water at a relatively high temperature. In this mode, the energy efficiency ratio of the heat pump unit 14 is higher than that of the soil source Heat pumps are higher. Similarly, when user 1 has a demand for domestic hot water during the non-heating period, and the outdoor temperature is high or the solar radiation is strong, using this mode to produce domestic hot water has the same advantages compared with ground source heat pumps.

Among the above several operation modes, if mode a and mode c are combined, domestic hot water and supplementary heat can be supplied simultaneously during the non-heating period, or cooling and supplementary heat can be supplied simultaneously in summer.

Fig. 2 is a schematic diagram of the soil source heat pump system for heating or cooling provided by the utility model provided by the utility model. When the operating conditions are met, the water outlet from the buried pipe 10 enters the ground source side of the heat pump unit 14 through the ground source side water separator 12 and the ground source side water pump 13 to provide the heat pump unit 14 with a low-level heat source or cold source, and then passes through the ground source side collector. The water device 9 returns to the buried pipe 10; the return water from the user enters the user side of the heat pump unit 14 through the user-side water collector 17 to be heated or cooled, and then passes through the user-side water pump 15, the user-side water distributor 16 and the first valve 18 Back to user 1, the ground source heat pump is used for heating, domestic hot water or cooling.

Fig. 3 is a schematic diagram of the second heat exchanger heat pump heat supplement mode of the soil source heat pump system that takes heat from the environment provided by the utility model. The difference from the operation mode shown in Fig. 2 is that in this mode, user 1 stops heating or cooling ; When the outdoor air temperature in the non-heating period is high, and the user has no demand for domestic hot water at this moment, the user side of the second heat exchanger 4 exchanges heat with the environment to produce hot water and enters the first through the third valve 3 The second heat exchanger side of the heat exchanger 2 releases heat, and then returns to the second heat exchanger 4 through the second heat exchanger water pump 5; the user-side outlet water of the heat pump unit 14 passes through the user-side water pump 15 and the user-side water separator 16 and the second valve 19 enter the user side of the heat pump unit of the first heat exchanger 2 to be heated, and then return to the user side of the heat pump unit 14 to release heat through the user-side water collector 17; The water tank 12 and the ground source side water pump 13 enter the ground source side of the heat pump unit 14 to be heated, and then return to the buried pipe 10 through the ground source side water collector 9; in this mode, the second heat exchanger 4 and the heat pump unit 14 Combined, heat is taken from the environment, and heat is supplied to the soil after the heat pump unit raises the temperature; in this mode, the outdoor temperature is high, and the heat pump unit has a high energy efficiency ratio, and at the same time, it has the advantages of high supplementary water temperature and large supplementary heat. features.

Fig. 4 is a schematic diagram of the second heat exchanger direct supplementary heat mode of the soil source heat pump system provided by the utility model, which is different from the operation mode shown in Fig. 2 in that the heat pump unit 14 stops running; when the non-heating period When the outdoor air temperature further increases or the solar radiation is strong, the water from the buried pipe 10 enters the user side of the second heat exchanger 4 through the ground source side water separator 12, the seventh valve 11, and the second heat exchanger water pump 5 is heated, and then returns to the underground pipe 10 through the sixth valve 8 and the ground source side water collector 9; in this mode, the outdoor temperature is higher than that of mode b or the solar radiation is stronger, and the second heat exchanger 4 can directly Obtain more convective or radiant heat from the environment to produce hot water at a higher temperature, and directly supply heat to the soil without passing through the heat pump unit 14, which has a higher energy efficiency ratio than mode b.

Fig. 5 is a schematic diagram of the heat supply mode of the second heat exchanger heat pump of the soil source heat pump system provided by the utility model, which is different from the operation mode shown in Fig. When the air temperature is high or the solar radiation is strong, the user side of the second heat exchanger 4 exchanges heat with the environment to produce hot water, enters the heat pump unit 14 through the fourth valve 6, and releases heat on the ground source side, and then passes through the fifth valve. 7. The water pump 5 of the second heat exchanger returns to the second heat exchanger 4; the user return water passes through the user-side water collector 17 to the user side of the heat pump unit 14 to be heated, and then passes through the user-side water pump 15 and the user-side water separator 16 , the first valve 18 goes back to user 1 . At the beginning and end of heating, the second heat exchanger 4 is used to obtain heat from the environment and heat is supplied to the user 1 after the heat pump unit 14 raises the temperature, which can reduce the heat taken by the system from the soil and slow down the phenomenon of soil thermal imbalance; in addition, especially at the end of heating , after the heat extraction throughout the heating season, the outlet water temperature of the buried pipe 10 is relatively low, while the second heat exchanger 4 is used to extract heat from the environment to produce hot water at a relatively high temperature. In this mode, the energy efficiency ratio of the heat pump unit 14 is higher than that of the soil source Heat pumps are higher. Similarly, when user 1 has a demand for domestic hot water during the non-heating period, and the outdoor temperature is high or the solar radiation is strong, using this mode to produce domestic hot water has the same advantages compared with ground source heat pumps.

Claims (3)

1. A soil source heat pump system that takes heat from the environment, including a heat pump unit (14), buried pipes (10), users (1), ground source side water collectors (9), ground source side water separators ( 12), ground source side water pump (13), user side water pump (15), user side water separator (16), first valve (18) and user side water collector (17); the heat pump unit (14) The outlet on the user side is sequentially connected to the user-side water pump (15), the user-side water separator (16), the first valve (18), the user (1) and the user-side water collector (17) back to the heat pump unit (14). side, constituting the heating and cooling circuit on the user side of the heat pump unit; the outlet on the ground source side of the heat pump unit (14) is sequentially connected to the ground source side water collector (9), the buried pipe (10), and the ground source side water separator ( 12) and the ground source side water pump (13) return to the ground source side of the heat pump unit (14) to form a heating and cooling circuit on the ground source side of the heat pump unit; it is characterized in that: the soil source heat pump system for obtaining heat from the environment also includes The first heat exchanger (2), the second heat exchanger (4), the second heat exchanger water pump (5), the second valve (19), the third valve (3), the fourth valve (6), the Five valves (7), sixth valve (8) and seventh valve (11); the user-side outlet of the heat pump unit of the first heat exchanger (2) is sequentially connected to the user-side water collector (17), heat pump unit (14) The user side, the user side water pump (15), the user side water separator (16) and the second valve (19) return to the first heat exchanger (2), forming the user side of the heat pump unit of the first heat exchanger loop; the user-side outlet of the second heat exchanger (4) is sequentially connected to the third valve (3), the second heat exchanger side of the first heat exchanger (2) and the second heat exchanger water pump (5 ) returns to the second heat exchanger (4) to form the second heat exchanger heat pump heating loop; the user side outlet of the second heat exchanger (4) is connected to the sixth valve (8) and the ground source side in turn The water collector (9), the buried pipe (10), the water distributor on the ground source side (12), the seventh valve (11) and the second heat exchanger water pump (5) return to the second heat exchanger (4) , constituting the second heat exchanger direct heat supplement circuit; the user side outlet of the second heat exchanger (4) is sequentially connected to the fourth valve (6), the ground source side of the heat pump unit (14), the fifth valve (7 ) and the second heat exchanger water pump (5) return to the second heat exchanger (4), forming the direct heating circuit of the second heat exchanger. 2. A ground-source heat pump system for extracting heat from the environment according to claim 1, characterized in that: said heat pump unit (14) adopts refrigerant side switching or external Two structural forms are switched on the waterway side. 3. A soil source heat pump system for taking heat from the environment according to claim 1, characterized in that: the second heat exchanger (4) adopts an air-cooled heat exchanger, a solar heat collector and a solution spray One or a combination of shower heat exchangers.