US 7,000,412 B2Granted

Constant temperature refrigeration system for extensive temperature range application and control method thereof

AssigneeIndustrial Technology Research Institute

InventorsEh-Dih Huang, Wen-Ruey Chang

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Abstract

A constant temperature refrigeration system for extensive temperature range application comprising a refrigerator, a low-temperature heat exchanger, a medium-temperature heat exchanger, a high-temperature heat exchanger, a pump, a first solenoid valve, a second solenoid valve, a third solenoid valve, a temperature sensor, a power regulator, a controller and a plurality of heaters, the temperature sensor is utilized for determining the working fluid temperature and compare the actual input temperature, the actual output temperature and the predetermined temperature, and the controller is utilized for switching the first solenoid valve, the second solenoid valve and the third solenoid valve for conveying the fluid to flow through various heat exchangers so that the working fluid is heated or cooled, with the result being that the working fluid temperature outputted is to reach the predetermined temperature, so as to acquire the working fluid having the exactly and precisely predetermined low temperature (−40° C. to 25° C.), medium temperature (25° C. to 50° C.) or high temperature (50° C. to 100° C.).

Claims14

Dependent claims

wherein said input end, said first solenoid valve, said high-temperature heat exchanger, said pump and said output end in turn form a first loop of working fluid between said input end and said output end via conduits;
said input end, said second solenoid valve, said medium-temperature heat exchanger, said low-temperature heat exchanger, said high-temperature heat exchanger, said pump and said output end in turn form a second loop of working fluid between said input end and said output end via conduits;
and
said input end, said third solenoid valve, said low-temperature heat exchanger, said high-temperature heat exchanger, said pump, and said output end in turn form a third loop of working fluid between said input end and said output end via conduits;
said refrigerator is connected in tandem with said low-temperature heat exchanger, whereas a medium-temperature cooling source flows through said medium-temperature heat exchanger, with said first heater being disposed on the outlet of the cooling end of said medium-temperature heat exchanger and said second heater being disposed on the inlet of the cooling end of said medium-temperature heat exchanger.

2 more elements

wherein said input end, said high-temperature heat exchanger, said pump, said first solenoid valve and said output end in turn form a first loop of working fluid between said input end and said output end via conduits;
said input end, said high-temperature heat exchanger, said pump, said second solenoid valve, said medium-temperature heat exchanger, said low-temperature heat exchanger and said output end in turn form a second loop of working fluid between said input end and said output end via conduits;
said input end, said high-temperature heat exchanger, said pump, said third solenoid valve, said low-temperature heat exchanger and said output end in turn form a third loop of working fluid between said input end and said output end via conduits;
said refrigerator is connected in tandem with said low-temperature heat exchanger, whereas a medium-temperature cooling source flows through said medium-temperature heat exchanger, with said first heater being disposed on the outlet of the cooling end of said medium-temperature heat exchanger and said second heater being disposed on the inlet of the cooling end of said medium-temperature heat exchanger.

1 more element

Dependencies are inferred from the claim text.