CN201837000U - Soil source composite heating and cooling air conditioner system - Google Patents

Abstract

The utility model provides a soil-source compound heating and cooling air-conditioning system, which belongs to the field of air conditioning, and particularly relates to a system for indoor installation of heating and cooling air-conditioning in hot summer and warm winter regions. The air-conditioning system includes air-conditioning terminal equipment, a heat pump unit, a chiller unit, a soil heat exchanger, and a cooling tower connected in parallel with the above-mentioned soil heat exchanger to release system heat together. In summer cooling conditions, when the indoor cooling load is not high, the chiller is used to match the soil heat exchanger; when the indoor cooling load is large, the chiller is used to match the soil heat exchanger and the cooling tower to release heat; The cooling of the heat pump unit is used for peak regulation; compared with the single buried pipe system, the length of the buried pipe is reduced, thereby reducing the investment cost, and it can maintain the approximate balance between the heat absorbed by the soil heat exchanger in winter and the heat released in summer. Under heating conditions, the heat pump unit is used to match the soil heat exchanger to ensure the energy-efficient operation of the unit and the system.

Description

A Soil Source Composite Cooling and Heating Air Conditioning System

technical field

The utility model belongs to the field of air conditioning, in particular to a system for installing cooling and heating air conditioners indoors in hot summer and warm winter regions.

Background technique

In hot-summer and warm-winter regions, the temperature in summer is high and the time is long, and the cooling load is much greater than the heating load. If the soil heat exchanger is configured according to the cooling load, about 50% of the buried pipes will be idle in winter without heat exchange. Mismatch. Moreover, if the heat is released completely by the soil source heat exchanger, the configuration of the soil heat exchanger will inevitably be increased, which will not only make the initial investment of the soil heat exchanger higher, but also cause the heat emitted by the soil heat exchanger to the soil in summer to be much greater than that in winter The heat absorbed from the soil will cause an imbalance between the heat absorbed in winter and the released heat in summer. The long-term operation of the system may change the soil temperature field around the buried pipe, resulting in weakened heat transfer capacity and affecting the energy efficiency ratio and operating characteristics of the system.

In addition, if the heat pump equipment is configured according to the cooling load, the cooling energy efficiency ratio of the heat pump equipment mainly used for cooling is significantly lower than that of the chiller.

Therefore, in southern buildings where cooling is the main demand, the combination of water chillers and heat pump units coupled with soil heat exchangers and cooling towers can be used to maintain a rough balance between the heat absorbed by the soil heat exchanger in winter and the heat released in summer. , improve the energy efficiency ratio of cooling and heating, reduce the buried pipe length of the soil heat exchanger, and reduce the project cost.

Utility model content

The purpose of this utility model is to provide a soil-source composite cooling and heating air-conditioning system, which is used to provide an air-conditioning system that can release heat through the coupling of a cooling tower and a soil heat exchanger to meet the cooling demand.

A soil-source composite cooling and heating air-conditioning system, the system includes an air-conditioning terminal equipment, a heat pump unit, a water chiller and a soil heat exchanger, and is characterized in that the air-conditioning system also includes:

The cooling tower is a device that is connected in parallel with the above-mentioned soil heat exchanger and jointly releases the heat of the system.

Further, the described composite cooling and heating air-conditioning system also has the following technical features:

This air conditioning system is typically suitable for areas with hot summer and warm winter.

Under cooling conditions, when the cooling load required in the room is not high, the chiller is used to match the soil heat exchanger; when the indoor cooling load is large, the chiller is used to match the soil heat exchanger and the cooling tower to release heat ; The heat pump unit is used for peak regulation.

The soil heat exchanger can not only provide the heat source for the heat pump unit, but also release heat for the chiller unit.

The soil heat exchanger and the cooling tower are connected in parallel under the cooling condition; under the heating condition, the cooling tower and the water chiller are closed, and the soil heat exchanger absorbs heat for the system.

The utility model has the advantages of:

In summer cooling conditions, when the indoor cooling load is not high, the chiller is used to match the soil heat exchanger; when the indoor cooling load is large, the chiller is used to match the soil heat exchanger and the cooling tower to release heat; The heat pump unit is used for peak load regulation. Compared with a single buried pipe system, the depth of the buried pipe is reduced, thereby reducing the investment cost, and it can keep the heat absorbed by the soil heat exchanger in winter and the heat released in summer in an approximate balance. Under heating conditions, the heat pump unit is used to match the soil heat exchanger to ensure the energy-efficient operation of the unit and the system. In view of the fact that the cooling load is much greater than the heating load in hot summer and warm winter regions, rationally design the optimal matching system of chillers, heat pump units, soil heat exchangers and cooling towers, and give full play to the advantages of heat pump units for heating and chillers for cooling.

Description of drawings

Fig. 1 is a structural diagram of the working principle of the cold pump unit in a soil-source composite cooling and heating air-conditioning system described in the utility model.

Fig. 2 is a structural diagram of the working principle of the heat pump unit in a soil-source composite cooling and heating air-conditioning system described in the utility model.

Fig. 3 is a schematic structural diagram of a soil-source composite cooling and heating air-conditioning system described in the utility model.

Detailed ways

Below with reference to accompanying drawing, in conjunction with specific embodiment, the utility model is described in more detail:

Description of Figure 1:

Referring to FIG. 1 , it is a schematic structural diagram of the cold pump unit in the composite cooling and heating air-conditioning system described in the present invention. The water chiller equipment is formed by connecting the following components with refrigerant pipes, that is, the exhaust port of the refrigeration compressor 9 is connected with one end of the water-cooled condenser 10, and the other end of the water-cooled condenser 10 is connected with one end of the throttle valve 8, The other end of the throttle valve 8 is connected with the evaporator and the chilled water tank 7 , the circulation pump 6 is connected with the chilled water tank, and the other end of the evaporator is connected with the suction port of the compressor 9 . Chillers are mainly used in cooling conditions.

Description of Figure 2:

Referring to FIG. 2 , it is a schematic structural diagram of the heat pump unit in the composite cooling and heating air-conditioning system described in the present invention. The heat pump unit equipment is composed of refrigerant pipes connecting the following components. Both ends of the compressor 23 are connected to the reversing valve 22, one end of the reversing valve 22 is connected to the condenser 20, and the other end of the condenser 20 is connected to the throttle valve 21. , and then connected with the evaporator 24, and finally connected with the reversing valve 22. In the cooling condition, the condenser 20 releases heat to the outside, and the evaporator 24 supplies cold air to the room; in the heating condition, the condenser 20 is used as an evaporator, and the evaporator 24 is used as a condenser to release heat and heat the room. .

Detailed ways:

The measure to achieve the above purpose is to couple the soil heat exchanger with the cooling tower, compound it with the heat pump unit, and control the start and stop of the cooling tower and each circulating pump according to the seasonal and ambient temperature changes, so as to achieve the purpose of rational use of machinery and equipment.

As shown in Figure 3, when the temperature is high in summer, the cooling load is large, and the chilled water (provided by the chilled water circulation pump 4) of the air-conditioning terminal equipment 5 is supplied from the expansion tank 1 to the pipeline where the air-conditioning terminal 5 is located through the throttle valve 2. Hydrate. Under refrigeration conditions, it can be roughly divided into two circulation processes, one of which is: the ground energy circulation pump 16 is turned on, and the ground energy circulation water with a lower temperature in the soil source heat exchanger 15 is injected into the condenser 20, and the condenser 20 Absorb the heat of the refrigerant and release heat to the ground energy circulating water, the temperature of the refrigerant decreases, and enters the compressor 23 through the reversing valve 22, and then flows into the evaporator 24 through the reversing valve 22, and the evaporator 24 absorbs the heat released by the air conditioner terminal 5 The heat is given to the refrigerant, and the refrigerant returns to the condenser 20 through the throttle valve 21, thus forming a closed cycle, releasing the heat generated by the air-conditioning terminal equipment to the soil. Another refrigeration cycle process is: the chiller circulation pump 6 and the cooling tower circulation pump 11 are turned on, the water at a lower temperature in the cooling tower 13 enters the water-cooled condenser 10 through the valve 14, and is injected into the cooling tower 13 through the valve 12 after heating up . Thus, the temperature of the refrigerant in the compressor 9 flows through the water-cooled condenser 10 to release heat, and then the temperature decreases, and then the evaporator and the cold water tank 7 absorb the heat of the frozen water flowing through the throttle valve 3, and the circulating pump 6 of the water chiller sets Chilled water is injected into the air-conditioning terminal equipment 5 . When the cooling load required in the room is not high, the chiller is used to match the soil heat exchanger, the heat pump unit and the cooling tower are not working, the cooling tower circulation pump 11, cooling tower valves 12, 14 and valves 19, 25 are turned off, and the rest are turned on; When the cooling load required in the room is large, the chiller unit is used to match the soil heat exchanger and the cooling tower to release heat at the same time. The heat pump unit does not work, and the valves 19 and 25 are closed, and the rest are opened; the heat pump unit is used for peak regulation. At this time All valves are open.

In winter, the heating mode is the main mode, the reversing valve 22 is connected to the heating mode, and the chiller circulating pump 6, cooling tower valves 12, 14, cooling tower circulating pump 11 and valves 17, 18, 26, 27 are closed. The condenser 20 is used as an evaporator, and the refrigerant evaporates in the condenser to absorb the heat of the circulating water in the soil source heat exchanger, that is, to absorb underground heat energy. The evaporator 24 is used as a condenser, and the air-conditioning terminal equipment 5 is connected with the indoor fan coil to provide indoor heating.

The above is a description but not a limitation of the utility model, and other implementations based on the idea of the utility model are within the protection scope of the utility model.

Claims (1)

1. A soil source compound heating and cooling air-conditioning system, the system includes an air-conditioning terminal unit, a heat pump unit, a water chiller and a soil heat exchanger, it is characterized in that the air-conditioning system also includes: A cooling tower is a structure connected in parallel with the above-mentioned soil heat exchanger. the

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