Refrigeration system with surge receiver and saturated gas defrost
AssigneeHussmann Corporation
InventorsRoland A. Ares, Steven J. Burpo, Wayne G. Schaeffer
Life of this patent
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Abstract
A refrigeration system having compressor, condenser, surge receiver and multiple evaporator means, and high side control means including gas defrost means for selectively defrosting the evaporator means with saturated refrigerant gas, a surge control valve for the surge receiver means, and other means for operating the surge control valve in response to differential high side pressures, liquid levels in the receiver means and/or gas defrost operations to regulate refrigerant pressures within the surge receiver means.
Claims36
A surge receiver control system for a multiple compressor refrigeration system having condenser means, a liquid header, a surge receiver in open refrigerant flow communication with said liquid header, branch liquid lines connecting multiple evaporators to said liquid line downstream of said surge receiver for refrigeration operations, and gas defrost means for selectively defrosting said evaporators;
- comprising a surge control valve disposed between the discharge side of the multiple compressors and said surge receiver in by-pass relation to said condenser means, said surge control valve including first means forming a closed pressure charge acting on said control valve in one direction to bias said valve toward an open position to establish fluid pressure communication between said compressors and said surge receiver, said first means being opposed by receiver pressure acting in the opposite directon for opening and closing said control valve in a modulating mode in response to a predetermined pressure differential thereacross, and said gas defrost means including second means for operating said surge control valve in a defrost mode different from said pressure differential in response to gas defrosting operations.
In a refrigeration system having compressor means, condenser means, surge receiver means and multiple evaporator means;
- said condenser means and evaporator means being connected by a liquid refrigerant line and said surge receiver means having a main liquid refrigerant tank connected in open gravity flow relation above a portion of said liquid line;
- and gas defrost means connected to said receiver means for taking refrigerant gas therefrom to selectively defrost said evaporator means;
- the improvement comprising high side control means for said refrigeration system including a surge control valve having a high pressure gas inlet connected to the discharge side of said compressor means and a valve outlet connected to said surge receiver means, first means for operating said surge control valve in a modulating mode toward maintaining a substantially constant predetermined pressure differential between the compressor discharge side and said surge receiver, second means for operating said surge control valve in a defrost mode during gas defrosting operations, and third means responsive to the level of liquid refrigerant in said surge receiver means for operating said surge control valve to regulate the pressure within said surge receiver means.
Dependencies are inferred from the claim text.