Denso Corporation

Yoshitaka Kume

Hirotsugu Takeuchi

Kunio Iritani

Hiroshi Oshitani

Hiroshi Ishikawa

Hisayoshi Sakakibara

Makoto Ikegami

Gota Ogata

Satoshi Nomura

Kazuhisa Makida

In an ejector cycle system using carbon dioxide as refrigerant, an ejector decompresses and expands refrigerant from a radiator to suck gas refrigerant evaporated in an evaporator, and converts an expansion energy to a pressure energy to increase a refrigerant pressure to be sucked into a compressor. Because refrigerant is decompressed and expanded in a super-critical area, a pressure difference during the decompression operation becomes larger, and a specific enthalpy difference becomes larger. Accordingly, energy converting efficiency in the ejector becomes higher, and efficiency of the ejector cycle system is improved.

Ejector cycle system with critical refrigerant pressure

In an ejector cycle system, a mixing portion of an ejector has a length in a refrigerant flow direction and an equivalent diameter, and a ratio of the length to the equivalent diameter of the mixing portion is equal to or smaller than 120. Further, a ratio of the equivalent diameter of the mixing portion to an equivalent diameter at an outlet of a nozzle of the ejector is in a range of 1.05-10. Accordingly, the ejector cycle system operates while a high ejector efficiency is maintained.

Ejector cycle system

Growing community of inventors

Kariya, Japan

Yoshitaka Kume