Method and control for preventing flooded starts in a heat pump

Details Method and control for preventing flooded starts in a heat pump Method and control for preventing flooded starts in a heat pump

2011-06-14

2011-06-14

Jiang, Chen-Wen (Department: 3784)

Refrigeration

Processes

Defrosting or frost inhibiting

C062S080000, C062S151000, C062S155000

Reexamination Certificate

active

07958737

ABSTRACT:
A heat pump is provided with an improvement while switching from heating/cooling mode to a defrost mode. Prior to initiation of a defrost mode, an electronic expansion device is moved to an open position such that refrigerant can migrate between the indoor-outdoor heat exchangers. When the operation of the defrost cycle is initiated, there is a lower likelihood and severity of flooded starts, as the refrigerant, under existing pressure differential at system shutdown, will move to the heat exchanger that will be downstream of the compressor in the defrost mode. Thus, no flooded start will occur on the subsequent compressor start-up. After completion of the defrost cycle, the electronic expansion device is again opened prior to return to operation in the conventional heating/cooling mode. In case subsequent starts are in an identical mode of operation, the electronic expansion valve is kept closed during shutdown to minimize cyclic performance losses.

REFERENCES:
patent: 5319943 (1994-06-01), Bahel et al.
patent: 2005/0011206 (2005-01-01), Luo et al.
patent: 3023769 (1982-01-01), None
patent: 01155154 (1989-06-01), None
patent: 1096573 (1998-04-01), None
patent: 10096573 (1998-04-01), None
patent: 2002206786 (2002-07-01), None
patent: 2002206786 (2002-07-01), None
European Search Report dated Feb. 18, 2009.
International Preliminary Report on Patentability dated Dec. 21, 2007.
Search Report PCT/US2005/19873, Nov. 15, 2005.

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