Patent Number: 6,167,722

Title: Refrigeration unit

Abstract: A refrigeration unit using HFC group coolant, having an enhanced cooling capacity so that the performance and the performance coefficient thereof can be enhanced, and the operation thereof can be stably made, the refrigeration unit having a refrigerating cycle in which a compressor 1, a condenser, a expansion valve and an evaporator, the expansion valve are connected in series in the mentioned order, d comprises HFC group coolant, and a subcooler located between the condenser and the evaporator, wherein the HFC group coolant is turned into liquid coolant in the subcooler, and is then branched into a main liquid stream and a substream which super-cools the main liquid stream through a super-cooling expansion valve, and is led into the intermediate stage part of the compressor.

Inventors: Kasezawa; Minoru (Shimizu, JP), Hirohashi; Jun-ichi (Shimizu, JP)

Assignee: Hitachi, Ltd.

International Classification: F25B 41/04 (20060101); F25B 40/02 (20060101); F25B 40/00 (20060101); F25B 041/00 ()

Expiration Date: 01/02/2018