COOLANT COOLER

• Main Authors: USUI HISASHI, YONEKURA MASAHIRO, TAMIYA YASUHIRO, SAWADA HIROYUKI
• Format: Patent
• Language: English
• Published: 12.02.1999
• Edition: 6
• Subjects: BLASTING; COLD ROOMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; COOLING OR FREEZING APPARATUS NOT COVERED BY ANY OTHERSUBCLASS; HEAT PUMP SYSTEMS; HEATING; ICE-BOXES; LIGHTING; LIQUEFACTION SOLIDIFICATION OF GASES; MANUFACTURE OR STORAGE OF ICE; MECHANICAL ENGINEERING; REFRIGERATION OR COOLING; REFRIGERATORS; WEAPONS

PROBLEM TO BE SOLVED: To prevent a coolant from freezing in the coolant channel of a heat exchanger by interrupting low temperature liquefied gas supply to the heat exchanger based on the detection value of at least any one of differential pressure of coolant or evaporation gas temperature. SOLUTION: Coolant pressures detected at coolant pressure detecting sections 11, 12 are inputted to a differential pressure switch(PS) 17 where an isolation valve 8 is operated based on the differential pressure detected at the coolant pressure detecting sections 11, 12, i.e., the differential pressure of coolant flowing both channels, and a preset value of differential pressure thus interrupting low temperature liquefied gas supply to the heat exchanger 3. Furthermore, an evaporation gas temperature detected at an evaporation gas temperature detecting section 9 is inputted to a second temperature indication controller(TIC 2) 16 where the isolation valve 8 is operated based on a preset temperature value and a detected evaporation gas temperature thus interrupting low temperature liquefied gas supply to the heat exchanger 3. More specifically, the low temperature circulation coolant is prevented surely from freezing by interrupting low temperature liquefied gas supply.