标题：Simulation and optimization of a R744 two- temperature supermarket refrigeration system with an ejector
作者：Huang, Zhuo; Zhao, Hongxia; Yu, Zeting; Han, Jitian
作者机构：[Huang, Zhuo; Zhao, Hongxia; Yu, Zeting; Han, Jitian] Shandong Univ, Sch Energy & Power Engn, Jinan 250061, Shandong, Peoples R China.
通讯作者：Zhao, Hongxia;Zhao, HX
通讯作者地址：[Zhao, HX]Shandong Univ, Sch Energy & Power Engn, Jinan 250061, Shandong, Peoples R China.
来源：INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
关键词：R744; Ejector; Supermarket; Transcritical refrigeration
摘要：In order to make R744 two-temperature supermarket refrigeration system operate effectively in countries with higher ambient temperatures such as China, a conventional booster refrigeration system was modified by adding an ejector into the system. Simulations were performed to investigate and optimize the new system under different ambient temperatures and compared with the conventional booster refrigeration system. Results showed that the compressor's work of the booster refrigeration system with an ejector can be reduced by more than 10% compared to the conventional booster refrigeration system at t(amb) = 35 degrees C, resulting in an increase of COP more than 11%. However, it is worse than the conventional booster refrigeration system when the ambient temperature is low. In order to solve this problem, a further improved booster refrigeration system with an ejector by adding different control strategies was proposed, which can ensure that the system operates with a high COP at all ambient temperatures. (C) 2018 Elsevier Ltd and IIR. All rights reserved.