Actuator means for the control of a refrigeration system expansion valve

Patent · Tue Sep 01 04:00:00 EDT 1987

OSTI ID:6098197

Mc Culloch, R M; Jorgensen, O

A regulating system is described for a refrigeration installation of the type having a compressor, condenser an an evaporator arranged in series and first and second electrical temperature sensors at the inlet and outlet ends of the evaporator. The first sensor is positioned to respond to the temperature of a liquid refrigeration expanded to suction pressure and the second sensor being positioned to respond to suction line sensible temperature. The regulating system, consists of thermostatic valve means for controlling the flow of refrigerant to the evaporator having an actuator chamber filled with a refrigerant medium having liquid an vapor phases, and electrical heat supply element in the actuator chamber. An electrical feedback in the actuator chamber, control means connected to the sensors and the elements for generating a superheat error signal for controlling the temperature of the refrigerant medium, and means for utilizing the first sensor to determine a reference start value for the valve means corresponding to the opening pressure of the refrigerant medium in the actuator chamber.

• Assignee: Danfoss A/S, Nordborg
• Patent Number(s): US 4689968
• OSTI ID: 6098197
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320106* -- Energy Conservation
Consumption
& Utilization-- Building Equipment-- (1987-)
ACTUATORS
BUILDINGS
COMPRESSORS
CONDENSERS
CONTROL EQUIPMENT
CONTROL SYSTEMS
EQUIPMENT
EVAPORATORS
FLOW REGULATORS
HEATING
MEASURING INSTRUMENTS
REFRIGERATORS
SIGNALS
SUPERHEATING
THERMOMETERS
VALVES