The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 07, 1992
Filed:
Nov. 30, 1990
Applicant:
Inventor:
Kevin F Dudley, Cazenovia, NY (US);
Assignee:
Electric Power Research Institute, Inc., Palo Alto, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F25B / ;
U.S. Cl.
CPC ...
622281 ; 236 75 ; 25112905 ;
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.