Control system for liquid chilled by an evaporator

Patent · Tue Apr 29 04:00:00 EDT 1986

OSTI ID:5760202

Hansen, J C; Ginder, H B

A control system is described for a refrigeration system having an adjustable capacity compressor, a condenser, and an evaporator through which chilled liquid is circulated. The system consists of: sensing means for sensing the temperature of the chilled liquid leaving the evaporator; regulating means, responsive to the sensed temperature, for regulating the capacity of the compressor as necessary to maintain the leaving chilled liquid at a desired temperature setpoint; means, responsive to the sensed temperature, for shutting the compressor down whenever the temperature of the leaving chilled liquid drops below the setpoint, by a fixed differential, to a cut-out temperature level; means for providing a reset temperature signal representing a predetermined increase in the temperature setpoint; and reset means, responsive to the reset temperature signal, for resetting the setpoint upward to a reset level, while at the same time shifting the cut-out temperature downward to a reset value to avoid a nuisance shutdown of the compressor when the setpoint is reset.

• Assignee: Borg-Warner Air Conditioning, Inc., York, PA
• Patent Number(s): US 4584845
• OSTI ID: 5760202
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320100* -- Energy Conservation
Consumption
& Utilization-- Buildings
COMPRESSORS
COMPUTERIZED CONTROL SYSTEMS
CONDENSERS
CONTROL
CONTROL SYSTEMS
COOLING
EVAPORATORS
FLUIDS
LIQUIDS
MEASURING INSTRUMENTS
REFRIGERATION
REFRIGERATORS
SIGNALS
TEMPERATURE CONTROL
THERMOMETERS