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Method for defrosting evaporator of refrigeration circuit

An evaporator and circuit technology, which is applied in the field of defrosting the evaporator in the refrigeration circuit, can solve the problems of shortening the defrosting cycle and the like

Inactive Publication Date: 2008-08-20
CARRIER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heating the evaporator may shorten the defrost cycle

Method used

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  • Method for defrosting evaporator of refrigeration circuit
  • Method for defrosting evaporator of refrigeration circuit
  • Method for defrosting evaporator of refrigeration circuit

Examples

Experimental program
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Embodiment Construction

[0029] Fig. 1 shows a refrigeration circuit 2 for circulating refrigerant in a predetermined flow direction. The cooling circuit 2 includes a compressor unit 4 , a heat dissipation heat exchanger 6 , a receiver 8 , at least one cooling electrical device 10 including an expansion device 12 and an evaporator 14 in the flow direction.

[0030] The compressor unit may comprise one or more compressors 16 connected in series or in parallel with each other.

[0031] If common refrigerant is used, the heat dissipation heat exchanger 6 may be a condenser. In the use of such as CO 2 In the case of "supercritical" refrigerants, ie if the refrigeration circuit 2 works in supercritical mode at least under certain operating conditions, the type of heat dissipation heat exchanger 6 is called a gas cooler.

[0032] A receiver or liquid / fluid separator 8 receives the refrigerant flowing from the radiating heat exchanger 6 . Liquid refrigerant collects in the lower part 18 of the receiver 8 ...

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PUM

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Abstract

Method for defrosting an evaporator in a refrigeration circuit (2) for circulating a refrigerant in a predetermined flow direction, the refrigeration circuit (2) comprising in flow direction a compressor unit (4), a heat-rejecting heat exchanger (6), an expansion device (12) and an evaporator (14), wherein the evaporator (14) comprises at least two refrigerant conduits (42; 44) and the method comprises the following steps: (a) operating the refrigeration circuit (2) in the normal cooling mode where the refrigerant exiting the heat-rejecting heat exchanger (6) flows through the expansion device (12) and through the evaporator (14) and towards the compressor unit (4); (b) terminating the cooling mode by interrupting the flow of the refrigerant exiting the heat-rejecting heat exchanger (6) into the evaporator (14); and (c) directing hot gas refrigerant through only a portion of the refrigerant conduits (42; 44) of the evaporator (14) for defrosting the evaporator (14).

Description

technical field [0001] The invention relates to a method for defrosting an evaporator in a refrigeration circuit, which is used to circulate refrigerant according to a predetermined flow direction. The refrigeration circuit includes a compressor unit, a heat radiation heat exchanger, an expansion device and an evaporator according to the flow direction. The invention further relates to a corresponding refrigerating circuit and an evaporator inside such a refrigerating circuit used in conjunction with this method. Background technique [0002] Evaporator freezing is a common problem in refrigeration circuits. In normal cooling mode, vapor from the ambient air condenses and freezes on the heat exchanging surfaces of the evaporator, forming a growing ice layer over time. This ice layer is known to reduce the heat transfer performance of the evaporator, resulting in lower refrigeration system efficiency and increased operating costs. [0003] Common evaporators include at leas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B47/02F25B39/02
CPCF25B39/02F25B2700/11F25B2400/22F25B47/022F28D7/0066
Inventor N·S·古普特
Owner CARRIER CORP