Method and apparatus for improving efficiency of a pulsed expans

Details Method and apparatus for improving efficiency of a pulsed expans Method and apparatus for improving efficiency of a pulsed expans

Filed on

1990-11-30

Date issued

1992-01-07

Examiner

Wayner, William E.

Patent Class

Refrigeration

SubClass

Automatic control

SubSubClass

Refrigeration producer

Other Related Categories

236 75, 25112905, F25B 100

Type

Patent

Status

active

Patent number

050779834

Description

ABSTRACT:
During start up of a heat pump compressor that is controlled by a pulsed expansion valve system the discharge temperature sensor control of the pulse system is interrupted and a predetermined constant pulse is applied to the expansion valve increasing capacity and reducing loss of suction pressure resulting in improved cyclic system efficiency. The constant pulse control is applied only during start up until the discharge temperature reaches a predetermined level at which point control is returned to the discharge temperature sensor.

REFERENCES:
patent: 4399862 (1983-07-01), Hile
patent: 4459819 (1984-10-01), Hargraves
patent: 4651535 (1987-07-01), Alsenz
patent: 4685309 (1987-03-01), Behr
patent: 4686835 (1987-04-01), Alsenz
patent: 4697431 (1987-09-01), Alsenz
patent: 4735060 (1988-04-01), Alsenz
patent: 4838037 (1989-06-01), Wood
patent: 4873838 (1989-01-01), Voorhis et al.

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