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Direct type soil source heat pump system

A soil source heat pump, a direct technology, applied in the field of refrigeration and heat pumps, can solve the problems of excessive refrigerant charge, complex system structure, increased cost, etc., to achieve the effect of reducing charge, reducing internal volume, and improving COP

Inactive Publication Date: 2008-08-06
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The current solution is to add a large-capacity liquid accumulator to the system to store the excess refrigerant in the system when the system is heating and running. The refrigerants used have a certain impact on the environment. R22 is an ozone-depleting gas and a greenhouse gas. Although its substitute refrigerants R407c, R410a and R134a are not ozone-depleting gases, they are still greenhouse gases). On the other hand, the system structure is complex and increase the cost

Method used

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  • Direct type soil source heat pump system
  • Direct type soil source heat pump system
  • Direct type soil source heat pump system

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Embodiment Construction

[0023] The heating mode and cooling mode of the present invention will be described below with reference to FIG. 1 and FIG. 2 . In the embodiment shown in Fig. 1 and Fig. 2, three parallel external finned copper tube buried heat exchanger branches are used.

[0024] As shown in Figure 1, this embodiment includes a compressor 1, an oil separator 2, a four-way reversing valve 3, a refrigerant / water heat exchanger 4, a water pump 5, a fan coil unit 6, a sight glass 8, a drying Filter 7 and buried heat exchanger branch, gas-liquid separation device 11 and two-way heterogeneous substance charging thermal expansion valve 9; the suction pipe of compressor 1 passes through gas-liquid separator 19 and its inlet pipe 19-1 and The 3-4 end of the four-way reversing valve 3 is connected, the exhaust pipe of the compressor 1 is connected with the 3-1 end of the four-way reversing valve 3 through the oil separator 2; the oil return pipe 2-1 of the oil separator 2 is connected with the The s...

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Abstract

The invention relates to a direct type soil source heat pump system, which belongs to the technical field of refrigeration and heat pump. The system is composed of a compressor, a gas-liquid separator, an oil separator, a four-way change-over valve, a cooling agent / water heat exchanger, a bi-directional different working medium heat filling expansion valve, a device for drying and filtering, a level glass, a liquid separating device, an air collecting pipe, parallel branch of an outer fin copper pipe buried heat exchanger, an one-way valve, a solenoid-controlled valve and the like. The bi-directional different working medium heat filling expansion valve is used for throttle, liquid separating is accomplished to liquid cooling agent after gas-liquid separation when heat-production is in progress, and the buried heat exchanger employs compact outer ribbed structure and can operate heat-production and refrigeration. The direct type soil source heat pump system has the advantages of reliability, high efficient and environment protection.

Description

technical field [0001] The invention relates to a direct soil source heat pump system, which adopts a bidirectional heterogeneous substance to charge a thermal expansion valve to throttle, separates the liquid refrigerant after gas-liquid separation during heating operation, and adopts a compact buried heat exchanger. The outer fin structure is capable of heating and cooling operations, and belongs to the technical field of refrigeration and heat pumps. Background technique [0002] Ground source heat pump systems can be divided into second loop ground source heat pump systems and direct ground source heat pump systems according to whether there is an intermediate heat transfer medium. In the second loop system, the soil first exchanges heat with the intermediate heat transfer medium (water or aqueous solution with antifreeze) driven by the water pump, and then the intermediate medium passes through the built-in intermediate heat exchanger and refrigerant of the heat pump un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B13/00F25B30/06
Inventor 马重芳王晓涛吴玉庭王伟王景甫鹿院卫
Owner BEIJING UNIV OF TECH
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