A floor radiant heating and cooling system based on soil source heat pump

Abstract

The present invention relates to a floor radiation heating and cooling system based on a soil source heat pump, which belongs to the field of heating, ventilation and air conditioning, and includes first to fourteenth flow regulating valves, air volume regulating valves, a first heat exchanger, a second heat exchanger, a mixing tank, a floor heating pipe, a first underground pipe group, a second underground pipe group and a soil source heat pump unit. The advantages are that the outlet water temperature of the underground pipe group can be directly used for floor radiation cooling, reducing the investment in the radiation cooling unit, and only consuming the energy consumption of the water pump, greatly reducing the energy consumption of the system; the heat exchanger is connected in series with the floor heating pipe to ensure that the water inlet temperature of the floor heating pipe is higher than the local dew point temperature; the refrigeration and dehumidification in winter utilizes the cold discharged into the soil to improve the energy efficiency of the system; in areas where the heat load is greater than the cold load, the building cold load can be increased in summer by increasing the fresh air volume, thereby balancing the heat stored / released by the soil source heat pump system to the soil, alleviating the degree of soil heat accumulation, and reducing the investment in auxiliary equipment, and improving the indoor air quality.

Description

Technical Field

[0001] The present invention belongs to the field of heating, ventilation and air conditioning, and in particular relates to a floor radiation heating and cooling system based on a soil source heat pump. Background Art

[0002] Since its introduction, the floor radiant heating system has been highly favored and widely used in northern my country. The floor radiant heating and air conditioning system uses low-temperature hot water as a medium to heat the surface of one or more radiant panels in the enclosure structure. The radiant panels then evenly radiate heat with other enclosure structures, furniture, heat sources and human bodies in the room, ultimately making the room meet thermal comfort requirements. Compared with traditional radiator systems, radiant heating and air conditioning systems have many advantages, such as uniform heat flow distribution, high thermal comfort, less occupied building area, sanitation and safety, long service life, energy saving and environmental protection. At the same time, the feet of people in the room are warm and the head is cool, which meets the health requirements of human physiology. However, due to the easy condensation on the surface of the radiant panels and insufficient cooling capacity, the floor radiant cooling and air conditioning system has not been widely used and promoted in my country. Summary of the invention

[0003] To solve the above problems, the present invention discloses a floor radiant heating and cooling system based on a soil source heat pump, which uses a heat exchanger to remove the wet load of the room and fresh air, avoids condensation in summer, improves indoor air quality, and uses floor heating pipes for floor radiant heating and cooling, reducing the secondary investment in the system terminal equipment.

[0004] To achieve the above-mentioned objectives, the present invention is implemented through the following technical solutions: a floor radiant heating and cooling system based on a soil source heat pump, comprising a first flow regulating valve, a second flow regulating valve, a third flow regulating valve, a fourth flow regulating valve, a fifth flow regulating valve, a sixth flow regulating valve, a seventh flow regulating valve, an eighth flow regulating valve, a ninth flow regulating valve, a tenth flow regulating valve, an eleventh flow regulating valve, a twelfth flow regulating valve, a thirteenth flow regulating valve, a fourteenth flow regulating valve, a first air volume regulating valve, a second air volume regulating valve, a third air volume regulating valve, a first heat exchanger, a second heat exchanger, a mixing tank, a floor heating pipe, a first buried pipe group, a second buried pipe group and a soil source heat pump unit.

[0005] In the present invention, all pipelines are uniformly insulated, the first flow regulating valve to the fourteenth flow regulating valve and the first air volume regulating valve to the third air volume regulating valve are all electric regulating valves, and temperature probes are provided in the valves. The valve opening size and temperature value can be displayed in the automatic control system, and the opening size can be adjusted; the mixing water tank is provided with an agitator and a temperature sensor for controlling the opening size of the first flow regulating valve and the eleventh flow regulating valve, so as to achieve a temperature in the mixing water tank that is about 1.5°C higher than the local dew point temperature.

[0006] By opening and closing the flow control valve and the air volume control valve, the system can switch between four operating modes: low-load cooling operation, medium- and high-load cooling operation, heating without dehumidification operation, and heating with dehumidification operation; and maintain the indoor design temperature and air quality.

[0007] A further improvement of the present invention is that: the working mode in the refrigeration low-load operation mode is: close the fourth flow regulating valve, the fifth flow regulating valve, the sixth flow regulating valve, the eighth flow regulating valve, the ninth flow regulating valve, and the second heat exchanger; part of the return air passes through the first air volume regulating valve and is mixed with the fresh air to enter the first heat exchanger for dehumidification and drying, and then passes through the second air volume regulating valve to enter the room after dehumidification, bears the indoor wet load, avoids condensation on the floor, and can bear part of the cold load when necessary; the second buried pipe group enters the mixing water tank through the eleventh flow regulating valve; the cooling water produced by the soil source heat pump unit exchanges heat with the first buried pipe group to release heat; the chilled water produced by the soil source heat pump unit passes through the third flow regulating valve and the second flow regulating valve and enters the first heat exchanger, and enters the mixing water tank through the first flow regulating valve after heat exchange in the first heat exchanger; an agitator and a temperature sensor are provided in the mixing water tank to control the opening size of the first flow regulating valve and the eleventh flow regulating valve, so that the water temperature in the mixing water tank is higher than the local dew point temperature by 1.5 ℃, after meeting the requirements, the water in the mixing tank enters the floor heating pipe through the seventh flow regulating valve to exchange heat with the indoor room, bearing the indoor cooling load, part of the water after heat exchange enters the unit, and the other part enters the second buried pipe group through the fourteenth flow regulating valve for heat exchange, thus completing a cycle in the refrigeration low-load operation mode.

[0008] A further improvement of the present invention is that the working mode in the refrigeration medium and high load operation mode is: close the third flow regulating valve, the fourth flow regulating valve, the sixth flow regulating valve, the eighth flow regulating valve, the ninth flow regulating valve, the tenth flow regulating valve, the twelfth flow regulating valve, the thirteenth flow regulating valve, and the second air volume regulating valve; part of the return air passes through the first air volume regulating valve and is mixed with the fresh air before entering the first heat exchanger for preliminary dehumidification and drying, and after the preliminary dehumidification, enters the second heat exchanger through the third air volume regulating valve for secondary drying, and the air after the secondary drying enters the room to bear the indoor humidity load, and can bear part of the cooling load when necessary; the second The buried pipe group enters the mixing tank through the eleventh flow regulating valve; the cooling water produced by the soil source heat pump unit exchanges heat with the first buried pipe group to release heat; the chilled water produced by the soil source heat pump unit enters the second heat exchanger through the fifth flow regulating valve to thoroughly dehumidify the air in the pipe, and after dehumidification, enters the first heat exchanger through the second flow regulating valve to preliminarily dehumidify the air in the pipe, and the dehumidified water enters the mixing tank through the first flow regulating valve; the mixing tank is provided with an agitator and a temperature sensor to control the opening size of the first flow regulating valve and the eleventh flow regulating valve, so that the water temperature in the mixing tank is about 1.5 ℃ higher than the local dew point temperature. After meeting the requirements, the water in the mixing tank enters the floor heating pipe through the seventh flow regulating valve to exchange heat with the room and bear the indoor cooling load. Part of the water after heat exchange enters the unit, and the other part enters the second buried pipe group through the fourteenth flow regulating valve for heat exchange, thus completing a cycle under the medium and high load operation mode of refrigeration.

[0009] A further improvement of the present invention is that the working mode in the heating but not dehumidification operation mode is: close the first flow regulating valve, the second flow regulating valve, the third flow regulating valve, the fifth flow regulating valve, the seventh flow regulating valve, the ninth flow regulating valve, the tenth flow regulating valve, the eleventh flow regulating valve, the fourteenth flow regulating valve, and the second air volume regulating valve; part of the return air is mixed with the fresh air through the first air volume regulating valve and then passes through the first heat exchanger and the third air volume regulating valve to enter the second heat exchanger for heating, and then enters the room after heating. The fresh air does not bear the indoor heat load; the second buried pipe group is merged with the first buried pipe group through the twelfth flow regulating valve and enters the soil source heat pump unit, taking away the soil source heat pump unit The cold energy is divided into two paths, one path enters the first buried pipe group to release the cold energy, and the other path enters the second buried pipe group through the thirteenth flow regulating valve to release the cold energy; the heat generated by the soil source heat pump unit is divided into two paths, one path enters the second heat exchanger through the sixth flow regulating valve to heat the air in the pipe, and returns to the soil source heat pump unit through the fourth flow regulating valve after heating, and the other path enters the floor heating pipe through the eighth flow regulating valve to exchange heat with the room, bear the indoor heat load, and return to the soil source heat pump unit after heat exchange, thus completing a cycle in the heating without dehumidification operation mode. This operation mode is suitable for areas where the fresh air is relatively dry, no dehumidification is required, and can directly bear the wet load. It is generally suitable for winter heating in northern regions.

[0010] A further improvement of the present invention is that: the working mode in the heating and dehumidification operation mode is: close the first flow regulating valve, the second flow regulating valve, the third flow regulating valve, the fifth flow regulating valve, the seventh flow regulating valve, the eleventh flow regulating valve, the fourteenth flow regulating valve, and the second air volume regulating valve; part of the return air passes through the first air volume regulating valve and is mixed with the fresh air to enter the first heat exchanger for dehumidification, and after dehumidification, enters the second heat exchanger through the third air volume regulating valve for heating, and enters the room after heating. The fresh air does not bear the indoor heat load; the cooling capacity generated by the soil source heat pump unit is divided into three routes. The first route enters the first heat exchanger through the tenth flow regulating valve to dehumidify the air in the pipe. After dehumidification, It returns to the soil source heat pump unit through the ninth flow regulating valve, exchanges heat with the first buried pipe group on the second route and returns to the soil source heat pump unit, and the third route enters the second buried pipe group through the thirteenth flow regulating valve for heat exchange, and returns to the soil source heat pump unit through the twelfth flow regulating valve after heat exchange; the heat generated by the soil source heat pump unit is divided into two routes, one route enters the second heat exchanger through the sixth flow regulating valve to heat the air in the pipe, and returns to the soil source heat pump unit through the fourth flow regulating valve after heating, and the other route enters the floor heating pipe through the eighth flow regulating valve to exchange heat with the indoor room, bear the indoor heat load, and return to the soil source heat pump unit after heat exchange, thus completing a cycle under the heating and dehumidification operation mode.

[0011] A further improvement of the present invention is that the first to fourteenth flow regulating valves and the first to third air volume regulating valves are all electric regulating valves, and temperature probes are provided inside the valves, which can display the valve opening size and temperature value in the automatic control system, and can adjust the opening size.

[0012] A further improvement of the present invention is that: the mixing water tank is provided with an agitator and a temperature sensor for controlling the opening of the first flow regulating valve and the eleventh flow regulating valve, so as to achieve a temperature in the mixing water tank (4) that is about 1.5°C higher than the local dew point temperature.

[0013] A further improvement of the present invention is that when the heat load in the area is much greater than the cooling load, the fresh air volume can be increased in summer to increase the cooling load of the building, thereby balancing the heat stored / released by the soil source heat pump unit (7) to the soil, while reducing the investment in auxiliary equipment and improving the indoor air quality.

[0014] Compared with the prior art, the present invention has the following effects:

[0015] (1) The present invention utilizes the circulating water temperature of the buried pipe of the soil source heat pump system, which is generally around 17°C, and is directly used for floor radiant cooling, thereby reducing the investment in the radiant cooling unit and consuming only the energy consumption of the water pump, thereby greatly reducing the energy consumption of the system and saving energy;

[0016] (2) The present invention reduces energy consumption by setting two heat exchangers and switching the number of heat exchangers to be used according to the building load (wet load and cold load);

[0017] (3) The water circuit and the air circuit of the heat exchanger of the present invention are reversed, the heat exchanger is connected in series with the floor heating pipe, and the chilled water enters the floor heating pipe after passing through the second heat exchanger and the first heat exchanger, ensuring that the water inlet temperature of the floor heating pipe is higher than the local dew point temperature;

[0018] (4) The present invention utilizes the chilled water of the evaporator for refrigeration and dehumidification in winter, without the need for an additional chiller, and the cold energy is discharged to the soil for secondary utilization, thereby reducing the energy efficiency of the system;

[0019] (5) In areas where the heat load is greater than the cooling load, the present invention can increase the cooling load of the building by increasing the amount of fresh air in summer, thereby balancing the heat stored / released by the soil source heat pump system to the soil, alleviating the degree of heat accumulation in the soil, while reducing the investment in auxiliary equipment and improving the indoor air quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of a floor radiation heating and cooling system based on a soil source heat pump according to the present invention.

[0021] Figure 2This is a floor radiation heating and cooling system based on a soil source heat pump - cooling low load operation principle diagram of Example 1 of the present invention.

[0022] Figure 3 This is a floor radiation heating and cooling system based on a soil source heat pump in Example 2 of the present invention - a schematic diagram of the high-load operation of cooling.

[0023] Figure 4 This is a schematic diagram of a floor radiation heating and cooling system based on a soil source heat pump in Example 3 of the present invention - heating without dehumidification operation.

[0024] Figure 5 This is a floor radiation heating and cooling system based on a soil source heat pump - heating and dehumidification operation principle diagram of Example 4 of the present invention.

[0025] List of reference numerals:

[0026] In the figure: 1-1-the first flow regulating valve; 1-2-the second flow regulating valve; 1-3-the third flow regulating valve; 1-4-the fourth flow regulating valve, 1-5-the fifth flow regulating valve; 1-6-the sixth flow regulating valve; 1-7-the seventh flow regulating valve, 1-8-the eighth flow regulating valve; 1-9-the ninth flow regulating valve; 1-10-the tenth flow regulating valve; 1-11-the eleventh flow regulating valve, 1-12-the twelfth flow regulating valve; 1-13-the thirteenth flow regulating valve, 1-14-the fourteenth flow regulating valve; 2-1-the first air volume regulating valve; 2-2-the second air volume regulating valve; 2-3-the third air volume regulating valve; 3-1-the first heat exchanger; 3-2-the second heat exchanger; 4-mixing tank; 5-floor heating pipe; 6-1-the first buried pipe group; 6-2-the second buried pipe group; 7-soil source heat pump unit. DETAILED DESCRIPTION

[0027] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0028] like Figure 1As shown: A floor radiant heating and cooling system based on a soil source heat pump, the system comprises a first flow regulating valve 1-1, a second flow regulating valve 1-2, a third flow regulating valve 1-3, a fourth flow regulating valve 1-4, a fifth flow regulating valve 1-5, a sixth flow regulating valve 1-6, a seventh flow regulating valve 1-7, an eighth flow regulating valve 1-8, a ninth flow regulating valve 1-9, a tenth flow regulating valve 1-10, an eleventh flow regulating valve 1-11, a twelfth flow regulating valve 1-12, a tenth It is composed of three flow regulating valves 1-13, a fourteenth flow regulating valve 1-14, a first air volume regulating valve 2-1, a second air volume regulating valve 2-2, a third air volume regulating valve 2-3, a first heat exchanger 3-1, a second heat exchanger 3-2, a mixing tank 4, a floor heating pipe 5, a first buried pipe group 6-1, a second buried pipe group 6-2 and a soil source heat pump unit 7. By opening and closing the flow regulating valve and the air volume regulating valve, the switching of four operating modes is realized to maintain the indoor design temperature and air quality.

[0029] All pipelines in this embodiment are uniformly insulated. The first flow regulating valve 1-1 to the fourteenth flow regulating valve 1-14 and the first air volume regulating valve 2-1 to the third air volume regulating valve 2-3 are all electric regulating valves. Temperature probes are provided in the valves. The valve opening size and temperature value can be displayed in the automatic control system, and the opening size can be adjusted. The mixing water tank 4 is provided with an agitator and a temperature sensor for controlling the opening size of the first flow regulating valve 1-1 and the eleventh flow regulating valve 1-11, so that the temperature in the mixing water tank 4 is about 1.5°C higher than the local dew point temperature.

[0030] Combination Figure 1 Description: A floor radiant heating and cooling system based on a soil source heat pump has four operating modes: 1) low-load cooling operation; 2) medium- and high-load cooling operation; 3) heating without dehumidification operation; 4) heating and dehumidification operation. The following is a detailed description.

[0031] Specific implementation method 1: Combination Figure 1 , Figure 2To explain this embodiment, a floor radiant heating and cooling system based on a soil source heat pump in this embodiment works as follows in the cooling low-load operation mode: close the fourth flow regulating valve 1-4, the fifth flow regulating valve 1-5, the sixth flow regulating valve 1-6, the eighth flow regulating valve 1-8, the ninth flow regulating valve 1-9, the tenth flow regulating valve 1-10, the twelfth flow regulating valve 1-12, the thirteenth flow regulating valve 1-13, the third air volume regulating valve 2-3, and the second heat exchanger 3-2; part of the return air passes through the first air volume regulating valve 2-1 and is mixed with the fresh air before entering the first heat exchanger 3-1 for dehumidification and drying, and after dehumidification, it enters the room through the second air volume regulating valve 2-2 to bear the indoor wet load and avoid ground When condensation occurs, the plate can bear part of the cooling load when necessary; the second underground pipe group 6-2 enters the mixing water tank 4 through the eleventh flow regulating valve 1-11; the cooling water produced by the ground source heat pump unit 7 exchanges heat with the first underground pipe group 6-1 to release heat; the chilled water produced by the ground source heat pump unit 7 enters the first heat exchanger 3-1 after passing through the third flow regulating valve 1-3 and the second flow regulating valve 1-2, and enters the mixing water tank 4 through the first flow regulating valve 1-1 after heat exchange in the first heat exchanger 3-1; the mixing water tank 4 is provided with an agitator and a temperature sensor to control the opening of the first flow regulating valve 1-1 and the eleventh flow regulating valve 1-11, so that the water temperature in the mixing water tank 4 is higher than the local dew point temperature by 1.5 ℃, after meeting the requirements, the water in the mixing tank 4 enters the floor heating pipe 5 through the seventh flow regulating valve 1-7 to exchange heat with the indoor room, bearing the indoor cooling load, and part of the water after heat exchange enters the unit, and the other part enters the second buried pipe group 6-2 through the fourteenth flow regulating valve 1-14 for heat exchange, thus completing a cycle in the refrigeration low-load operation mode.

[0032] Specific implementation plan 2: Combined Figure 1 , Figure 3The present embodiment is described. The present embodiment is a floor radiant heating and cooling system based on a soil source heat pump. The working method in the medium and high load operation mode of cooling is as follows: close the third flow regulating valve 1-3, the fourth flow regulating valve 1-4, the sixth flow regulating valve 1-6, the eighth flow regulating valve 1-8, the ninth flow regulating valve 1-9, the tenth flow regulating valve 1-10, the twelfth flow regulating valve 1-12, the thirteenth flow regulating valve 1-13, and the second air volume regulating valve 2-2; part of the return air passes through the first air volume regulating valve 2-1 and is mixed with the fresh air and enters the first heat exchanger 3-1 for preliminary dehumidification and drying. After the preliminary dehumidification, the return air passes through the third air volume regulating valve 2-3 and enters the second heat exchanger 3-2 for secondary drying. The air after secondary drying enters the room to bear the indoor humidity load. It can bear part of the cooling load when necessary; the second buried pipe group 6-2 enters the mixing water tank 4 through the eleventh flow regulating valve 1-11; the cooling water produced by the soil source heat pump unit 7 exchanges heat with the first buried pipe group 6-1 to release heat; the chilled water produced by the soil source heat pump unit 7 enters the second heat exchanger 3-2 through the fifth flow regulating valve 1-5 to thoroughly dehumidify the air in the pipe, and after dehumidification, enters the first heat exchanger 3-1 through the second flow regulating valve 1-2 to preliminarily dehumidify the air in the pipe, and the dehumidified water enters the mixing water tank 4 through the first flow regulating valve 1-1; the mixing water tank 4 is provided with an agitator and a temperature sensor to control the opening of the first flow regulating valve 1-1 and the eleventh flow regulating valve 1-11, so that the water temperature in the mixing water tank 4 is higher than the local dew point temperature by 1.5 ℃, after meeting the requirements, the water in the mixing tank 4 enters the floor heating pipe 5 through the seventh flow regulating valve 1-7 to exchange heat with the indoor room, bearing the indoor cooling load, and part of the water after heat exchange enters the unit, and the other part enters the second buried pipe group 6-2 through the fourteenth flow regulating valve 1-14 for heat exchange, thus completing a cycle in the medium and high load operation mode of refrigeration.

[0033] Specific implementation plan three: Combined Figure 1 , Figure 4To explain this embodiment, a floor radiant heating and cooling system based on a soil source heat pump in this embodiment works as follows in the heating but not dehumidifying operation mode: close the first flow regulating valve 1-1, the second flow regulating valve 1-2, the third flow regulating valve 1-3, the fifth flow regulating valve 1-5, the seventh flow regulating valve 1-7, the ninth flow regulating valve 1-9, the tenth flow regulating valve 1-10, the eleventh flow regulating valve 1-11, the fourteenth flow regulating valve 1-14, and the second air volume regulating valve 2-2; part of the return air is mixed with the fresh air through the first air volume regulating valve 2-1 and then passes through the first heat exchanger 3-1 and the third air volume regulating valve 2-3 to enter the second heat exchanger 3-2 for heating, and then enters the room after heating. The fresh air does not bear the indoor heat load; the second buried pipe group 6-2 is connected to the first buried pipe group 6-2 through the twelfth flow regulating valve 1-12 After being collected by group 6-1, it enters the soil source heat pump unit 7, takes away the cold energy of the soil source heat pump unit 7 and is divided into two paths. One path enters the first buried pipe group 6-1 to release the cold energy, and the other path enters the second buried pipe group 6-2 through the thirteenth flow regulating valve 1-13 to release the cold energy; the heat generated by the soil source heat pump unit 7 is divided into two paths. One path enters the second heat exchanger 3-2 through the sixth flow regulating valve 1-6 to heat the air in the pipe, and returns to the soil source heat pump unit 7 after heating through the fourth flow regulating valve 1-4. The other path enters the floor heating pipe 5 through the eighth flow regulating valve 1-8 to exchange heat with the room, bear the indoor heat load, and return to the soil source heat pump unit 7 after heat exchange. In this way, a cycle in the heating without dehumidification operation mode is completed. This operation mode is suitable for areas where the fresh air is relatively dry, no dehumidification is required, and can directly bear the wet load. It is generally suitable for winter heating in northern regions.

[0034] Specific implementation plan 4: Combination Figure 1 , Figure 5The present embodiment is described. A floor radiant heating and cooling system based on a soil source heat pump in the present embodiment works as follows in the heating and dehumidification operation mode: the first flow regulating valve 1-1, the second flow regulating valve 1-2, the third flow regulating valve 1-3, the fifth flow regulating valve 1-5, the seventh flow regulating valve 1-7, the eleventh flow regulating valve 1-11, the fourteenth flow regulating valve 1-14, and the second air volume regulating valve 2-2 are closed; part of the return air passes through the first air volume regulating valve 2-1 and is mixed with the fresh air and enters the first heat exchanger 3-1 for dehumidification. After dehumidification, it passes through the third air volume regulating valve 2-3 and enters the second heat exchanger 3-2 for heating, and then enters the room after heating. The fresh air does not bear the indoor heat load; the cooling capacity generated by the soil source heat pump unit 7 is divided into three routes. The first route enters the first heat exchanger through the tenth flow regulating valve 1-10. 3-1 dehumidifies the air in the pipe, and after dehumidification, it returns to the soil source heat pump unit 7 through the ninth flow regulating valve 1-9. The second route exchanges heat with the first buried pipe group 6-1 and returns to the soil source heat pump unit 7. The third route passes through the thirteenth flow regulating valve 1-13 to enter the second buried pipe group 6-2 for heat exchange, and after heat exchange, it passes through the twelfth flow regulating valve 1-12 to return to the soil source heat pump unit 7; the heat generated by the soil source heat pump unit 7 is divided into two routes, one route enters the second heat exchanger 3-2 through the sixth flow regulating valve 1-6 to heat the air in the pipe, and after heating, it returns to the soil source heat pump unit 7 through the fourth flow regulating valve 1-4, and the other route enters the floor heating pipe 5 through the eighth flow regulating valve 1-8 to exchange heat with the room, bear the indoor heat load, and return to the soil source heat pump unit 7 after heat exchange, thus completing a cycle under the heating and dehumidification operation mode.

[0035] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above technical features.

Claims

1. A floor radiant heating and cooling system based on a soil source heat pump, characterized in that: The invention comprises a first flow regulating valve (1-1), a second flow regulating valve (1-2), a third flow regulating valve (1-3), a fourth flow regulating valve (1-4), a fifth flow regulating valve (1-5), a sixth flow regulating valve (1-6), a seventh flow regulating valve (1-7), an eighth flow regulating valve (1-8), a ninth flow regulating valve (1-9), a tenth flow regulating valve (1-10), an eleventh flow regulating valve (1-11), a twelfth flow regulating valve (1-12), a thirteenth flow regulating valve (1-13), a fourteenth flow regulating valve (1-14), a first air volume regulating valve (2-1), a second air volume regulating valve (2-2), a third air volume regulating valve (2-3), and a first heat exchanger (3 -1), the second heat exchanger (3-2), the mixing tank (4), the floor heating pipe (5), the first buried pipe group (6-1), the second buried pipe group (6-2) and the soil source heat pump unit (7), by opening and closing the flow control valve and the air volume control valve, the mode switching of four operation methods including low-load cooling operation, medium-to-high-load cooling operation, heating without dehumidification operation and heating with dehumidification operation is realized; the indoor design temperature and air quality are maintained; the working mode in the heating and dehumidification operation mode is: closing the first flow control valve (1-1), the second flow control valve (1-2), the third flow control valve (1-3), the fifth flow control valve (1-5), the seventh flow control valve (1-7), the eleventh flow control valve (1-8) 11), the fourteenth flow regulating valve (1-14), the second air volume regulating valve (2-2); part of the return air passes through the first air volume regulating valve (2-1) and is mixed with the fresh air before entering the first heat exchanger (3-1) for dehumidification. After dehumidification, it passes through the third air volume regulating valve (2-3) and enters the second heat exchanger (3-2) for heating. After heating, it enters the room. The fresh air does not bear the indoor heat load. The cooling energy generated by the soil source heat pump unit (7) is divided into three paths. The first path passes through the tenth flow regulating valve (1-10) and enters the first heat exchanger (3-1) to dehumidify the air in the pipe. After dehumidification, it passes through the ninth flow regulating valve (1-9) and returns to the soil source heat pump unit (7). The second path exchanges heat with the first buried pipe group (6-1) and returns to the soil. The heat generated by the soil source heat pump unit (7) is divided into two paths, one path passes through the sixth flow regulating valve (1-6) to enter the second heat exchanger (3-2) to heat the air in the pipe, and after heating, passes through the fourth flow regulating valve (1-4) to return to the soil source heat pump unit (7), and the other path passes through the eighth flow regulating valve (1-8) to enter the floor heating pipe (5) to exchange heat with the room, bear the indoor heat load, and return to the soil source heat pump unit (7) after heat exchange, thus completing a cycle in the heating and dehumidification operation mode.

2. A floor radiant heating and cooling system based on a soil source heat pump according to claim 1, characterized in that: The working mode in the cooling low-load operation mode is: close the fourth flow regulating valve (1-4), the fifth flow regulating valve (1-5), the sixth flow regulating valve (1-6), the eighth flow regulating valve (1-8), the ninth flow regulating valve (1-9), the tenth flow regulating valve (1-10), the twelfth flow regulating valve (1-12), the thirteenth flow regulating valve (1-13), the third air volume regulating valve (2-3), and the second heat exchanger (3-2); part of the return air passes through the first air volume regulating valve (2-1) and is mixed with the fresh air before entering the first heat exchanger (3-1) for dehumidification and drying, and after dehumidification, enters the room through the second air volume regulating valve (2-2), bears the indoor humidity load, avoids condensation on the floor, and bears part of the cooling load; the second The buried pipe group (6-2) enters the mixing tank (4) through the eleventh flow regulating valve (1-11); the cooling water produced by the ground source heat pump unit (7) exchanges heat with the first buried pipe group (6-1) to release heat; the chilled water produced by the ground source heat pump unit (7) enters the first heat exchanger (3-1) after passing through the third flow regulating valve (1-3) and the second flow regulating valve (1-2), and enters the mixing tank (4) through the first flow regulating valve (1-1) after heat exchange in the first heat exchanger (3-1); the mixing tank (4) is provided with an agitator and a temperature sensor that can control the opening of the first flow regulating valve (1-1) and the eleventh flow regulating valve (1-11), so that the water temperature in the mixing tank (4) is higher than the local dew point temperature by 1.5 ℃, after the requirement is met, the water in the mixing tank (4) enters the floor heating pipe (5) through the seventh flow regulating valve (1-7) to exchange heat with the indoor room, bearing the indoor cooling load, and part of the water after heat exchange enters the unit, and the other part enters the second buried pipe group (6-2) through the fourteenth flow regulating valve (1-14) to exchange heat, thus completing a cycle in the low-load cooling operation mode.

3. A floor radiant heating and cooling system based on a soil source heat pump according to claim 1, characterized in that: The working mode in the refrigeration medium and high load operation mode is: close the third flow regulating valve (1-3), the fourth flow regulating valve (1-4), the sixth flow regulating valve (1-6), the eighth flow regulating valve (1-8), the ninth flow regulating valve (1-9), the tenth flow regulating valve (1-10), the twelfth flow regulating valve (1-12), the thirteenth flow regulating valve (1-13), and the second air volume regulating valve (2-2); part of the return air passes through the first air volume regulating valve (2-1) and is mixed with the fresh air before entering the first heat exchanger (3-1) for preliminary dehumidification and drying. After the preliminary dehumidification, the return air passes through the third air volume regulating valve (2-3) and enters the second heat exchanger (3-2) for secondary drying. The air after secondary drying enters the room to bear the indoor humidity load and part of the cooling load. The second buried pipe group (6-2 ) enters the mixing tank (4) through the eleventh flow regulating valve (1-11); the cooling water produced by the soil source heat pump unit (7) exchanges heat with the first buried pipe group (6-1) to release heat; the chilled water produced by the soil source heat pump unit (7) enters the second heat exchanger (3-2) through the fifth flow regulating valve (1-5) to thoroughly dehumidify the air in the pipe, and after dehumidification, enters the first heat exchanger (3-1) through the second flow regulating valve (1-2) to preliminarily dehumidify the air in the pipe, and the dehumidified water enters the mixing tank (4) through the first flow regulating valve (1-1); the mixing tank (4) is provided with an agitator and a temperature sensor to control the opening of the first flow regulating valve (1-1) and the eleventh flow regulating valve (1-11), so that the water temperature in the mixing tank (4) is higher than the local dew point temperature by 1.5 ℃, and after the requirement is met, the water in the mixing tank (4) enters the floor heating pipe (5) through the seventh flow regulating valve (1-7) to exchange heat with the indoor room, bearing the indoor cooling load. Part of the water after heat exchange enters the unit, and the other part enters the second buried pipe group (6-2) through the fourteenth flow regulating valve (1-14) to exchange heat, thus completing a cycle in the refrigeration medium and high load operation mode.

4. A floor radiant heating and cooling system based on a soil source heat pump according to claim 1, characterized in that: The working mode in the heating but not dehumidifying operation mode is as follows: the first flow regulating valve (1-1), the second flow regulating valve (1-2), the third flow regulating valve (1-3), the fifth flow regulating valve (1-5), the seventh flow regulating valve (1-7), the ninth flow regulating valve (1-9), the tenth flow regulating valve (1-10), the eleventh flow regulating valve (1-11), the fourteenth flow regulating valve (1-14), and the second air volume regulating valve (2-2) are closed; part of the return air is mixed with the fresh air through the first air volume regulating valve (2-1), passes through the first heat exchanger (3-1), the third air volume regulating valve (2-3), enters the second heat exchanger (3-2) for heating, and enters the room after being heated. The fresh air does not bear the indoor heat load; the second buried pipe group (6-2) is collected with the first buried pipe group (6-1) through the twelfth flow regulating valve (1-12), and then enters the soil source heat exchanger (3-2). The pump unit (7) takes away the cold energy of the soil source heat pump unit (7) and then divides it into two paths, one path enters the first buried pipe group (6-1) to release the cold energy, and the other path enters the second buried pipe group (6-2) through the thirteenth flow regulating valve (1-13) to release the cold energy; the heat generated by the soil source heat pump unit (7) is divided into two paths, one path enters the second heat exchanger (3-2) through the sixth flow regulating valve (1-6) to heat the air in the pipe, and after heating, returns to the soil source heat pump unit (7) through the fourth flow regulating valve (1-4), and the other path enters the floor heating pipe (5) through the eighth flow regulating valve (1-8) to exchange heat with the room, bear the indoor heat load, and return to the soil source heat pump unit (7) after heat exchange, thus completing a cycle in the heating without dehumidification operation mode. This operation mode is suitable for areas where the fresh air is relatively dry and does not require dehumidification, and can directly bear the wet load, and is suitable for winter heating in northern areas.

5. The floor radiant heating and cooling system based on a soil source heat pump according to claim 1, characterized in that: The first flow regulating valve (1-1) to the fourteenth flow regulating valve (1-14) and the first air volume regulating valve (2-1) to the third air volume regulating valve (2-3) are all electric regulating valves, and temperature probes are provided inside the valves. The valve opening size and temperature value can be displayed in the automatic control system, and the valve opening size can be adjusted.

6. A floor radiant heating and cooling system based on a soil source heat pump according to claim 1, characterized in that: The mixing water tank (4) contains an agitator and a temperature sensor for controlling the opening of the first flow regulating valve (1-1) and the eleventh flow regulating valve (1-11) to achieve a temperature in the mixing water tank (4) that is about 1.5°C higher than the local dew point temperature.

7. The floor radiant heating and cooling system based on a soil source heat pump according to claim 1, characterized in that: When the heat load of a region is much greater than the cooling load, the fresh air volume can be increased in summer to increase the cooling load of the building and balance the heat stored / released by the ground source heat pump unit (7) to the soil. At the same time, the investment in auxiliary equipment is reduced and the indoor air quality is improved.

8. According to the floor radiant heating and cooling system based on soil source heat pump according to claim 1, it is characterized in that: The water temperature after passing through the second heat exchanger (3-2) and the first heat exchanger (3-1) should be higher than the local dew point temperature.

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