Title: Solar augmented heat pump system with automatic staging reciprocating compressor

Abstract: A multi-cylinder reciprocating compressor is automatically staged at low ambient temperature to improve refrigerant volume flow while facilitating subcooler operation and return of vaporized refrigerant from the subcooler to the inlet of the second stage cylinders of the compressor in the two stage mode. A solar evaporator substitutes for the outdoor coil when the solar heated storage tank temperature exceeds that of ambient. During staging mode, the wrist pins of the low side cylinders and the high side cylinder undergo proper load reversals, since intermediate suction pressure is applied to the wrist pin of the high side cylinders.

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Inventors: Shaw, David N. (Unionville, CT, US)

Application Number: 806407
Filing Date: 1977-06-14
Publication_date: 1979-04-10
Assignee: Dunham-Bush, Inc. (West Hartford, CT)
Primary Class(es): 237/2B 62/160, 62/238.6, 62/324.6, 62/510
Other Classes:
US Patent Ref:

2619326	Nov, 1952	McLenegan	237/2.
4019679	Apr, 1977	Vogt et al.	62/175.
4030312	Jun, 1977	Wallin et al.	62/238.

Other Refs:
Primary Examiner: Croyle, Carlton R.
Assistant Examiner: Gluck, R. E.
Attorney: Sughrue, Rothwell, Mion, Zinn and Macpeak