Mitsubishi Denki Kabushiki Kaisha

Shohichiroh Masuda

Takashi Ikeda

Tomohiko Kasai

Yoshihiro Sumida

Hirofumi Koge

Hidekazu Tani

Moriya Miyamoto

Mitsunori Kurachi

Toshihiro Kikukawa

A heat source unit and refrigerant used in an existing refrigeration system are replaced with new refrigerant and a new heat source unit which employs the new refrigerant and is equipped with an oil separator and extraneous-matter trapping device. An indoor unit of the existing refrigeration system may be used, in its present form, or replaced with a new indoor unit. Further, connecting pipes used for the existing refrigeration are reused. After replacement of refrigerant, the refrigeration system performs an ordinary operation after having performed a cleaning operation. The extraneous-matter trapping device is provided in a refrigerant pipe close to the heat source unit or in a bypass channel connected to the refrigerant pipe close to the heat source unit. Alternatively, only the heat source unit of the existing refrigeration system is replaced with a new one, and there is employed refrigeration oil which has no mutual solubility with respect to HFC or has very low mutual solubility.

Refrigeration system, and method of updating and operating the same

Growing community of inventors

Kanagawa, Japan

Shohichiroh Masuda