Refrigeration system having a modulation valve which also performs function of compressor throttling valve

Patent · Tue Dec 18 00:00:00 EST 1990

OSTI ID:5163011

Hanson, J L

This paper discusses a method of controlling a refrigeration system having a compressor, with the compressor being driven by a prime mover. It comprises providing a controllable modulation valve which is open in the absence of electrical current flow, disposing the modulation valve in the refrigeration system in a position which enables the modulation valve to control the amount of refrigerant flow to the compressor, controlling the modulation valve in a predetermined range near a selected set point temperature according to a predetermined control algorithm, with the control algorithm otherwise allowing the modulation valve to remain open, causing the modulation valve to provide a predetermined restriction in the flow of refrigerant to the compressor for a predetermined period of time following start-up of the compressor, overriding the control algorithm, providing an overload signal in response to a predetermined overload condition of the prime mover, and causing the modulation valve to provide the predetermined restriction in the flow of refrigerant to the compressor in response to the overload signal, overriding the control algorithm.

• Assignee: Thermo King Corp., Minneapolis, MN (USA)
• Patent Number(s): US 4977751; A
• Application Number: PPN: US 7-458206
• OSTI ID: 5163011
• Resource Relation: Patent File Date: 28 Dec 1989
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
REFRIGERATORS
COMPUTERIZED CONTROL SYSTEMS
ALGORITHMS
COMPRESSORS
OPERATION
VALVES
CONTROL EQUIPMENT
CONTROL SYSTEMS
EQUIPMENT
FLOW REGULATORS
MATHEMATICAL LOGIC
ON-LINE CONTROL SYSTEMS
ON-LINE SYSTEMS
320106* - Energy Conservation
Consumption
& Utilization- Building Equipment- (1987-)