Prevention of flooded starts in heat pumps

Details Prevention of flooded starts in heat pumps Prevention of flooded starts in heat pumps

2005-02-16

2009-06-02

Jiang, Chen-Wen (Department: 3744)

Refrigeration

Automatic control

Selective heating or cooling

C062S115000, C062S231000

Reexamination Certificate

active

07540163

ABSTRACT:
A heat pump is provided with a method and control for eliminating flooded starts. In particular, the heat pump at start-up is operated for a short period of time in the opposite mode to that in which it had been operated before the previous shutdown. In this way, the compressor ingestion of liquid refrigerant is limited or completely eliminated. After a short period of time, the heat pump is moved back to the intended mode of operation. Additional features can be added to the control scheme to limit this type of operation at start-up only to certain ambient conditions or only to a prolonged period between shutdown and start-up.

REFERENCES:
patent: 3132490 (1964-05-01), Schmidt
patent: 3788394 (1974-01-01), Derragon, Jr.
patent: 4790142 (1988-12-01), Beckey
patent: 5632156 (1997-05-01), Takeo et al.
International Search Report and Written Opinion dated Aug. 9, 2007.

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