Ejector cycle system with critical refrigerant pressure

• Main Authors: Makida, Kazuhisa, Ikegami, Makoto, Takeuchi, Hirotsugu, Iritani, Kunio, Sakakibara, Hisayoshi, Ishikawa, Hiroshi, Kume, Yoshitaka, Nomura, Satoshi
• Format: Patent
• Language: English; French; German
• Published: 14.06.2017
• Subjects: BLASTING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; HEATING; LIGHTING; LIQUEFACTION SOLIDIFICATION OF GASES; MANUFACTURE OR STORAGE OF ICE; MECHANICAL ENGINEERING; REFRIGERATION MACHINES, PLANTS OR SYSTEMS; REFRIGERATION OR COOLING; WEAPONS

In an ejector cycle system using carbon dioxide as refrigerant, an ejector (400) decompresses and expands refrigerant from a radiator (200) to suck gas refrigerant evaporated in an evaporator (300), and converts an expansion energy to a pressure energy to increase a refrigerant pressure to be sucked into a compressor (100). A control valve (731) is disposed in a refrigerant passage between the radiator (200) and the ejector (400) to control an opening degree of the refrigerant passage based on a heating degree of refrigerant at an outlet side of the evaporator (300). 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.