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:
Dec. 06, 1977
Filed:
Mar. 31, 1976
Gilbert F Shultz, Novi, MI (US);
Ronald W Bailey, Westland, MI (US);
Application Engineering Corporation, Elk Grove Village, IL (US);
Abstract
A control system for a water chiller comprising a heat exchanger, a pump for circulating a coolant comprising water or other process fluid through a path including the heat exchanger, a process apparatus, and a reservoir, and a compressor for circulating refrigerant through a path including the heat exchanger and a condenser; the control system includes electronic sensors for sensing the water supply pressure to the process apparatus, the refrigerant pressures at the compressor inlet and outlet, the water level in the reservoir, and the water temperatures at the heat exchanger inlet and outlet. The control system further includes logic and control circuits which de-activate the pump for conditions of inadequate (or excessive) water pressure or inadequate water in the reservoir, which vary the refrigerant circulation to maintain the water temperature essentially constant at a preset level, and which protect the chiller against over or under-pressure refrigerant conditions and against excessive cooling, affording precision control and continuous monitoring of all chiller operations.