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

Abstract

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.

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

Citation Formats

Hanson, J L. Refrigeration system having a modulation valve which also performs function of compressor throttling valve. United States: N. p., 1990. Web.
Hanson, J L. Refrigeration system having a modulation valve which also performs function of compressor throttling valve. United States.
Hanson, J L. 1990. "Refrigeration system having a modulation valve which also performs function of compressor throttling valve". United States.
@article{osti_5163011,
title = {Refrigeration system having a modulation valve which also performs function of compressor throttling valve},
author = {Hanson, J L},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/5163011}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Dec 18 00:00:00 EST 1990},
month = {Tue Dec 18 00:00:00 EST 1990}
}