期刊
ENERGY
卷 79, 期 -, 页码 195-202出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2014.11.007
关键词
Refrigeration; Turbo expander; Subcritical refrigeration system; Throttle valve; Expansion power recovery
资金
- program for the National Natural Science Foundation of China [51076111]
Owing to the large volumetric expansion ratio of the subcritical refrigerant and the geometrical restriction of the positive displacement machine, investigations on expanders in subcritical vapor refrigeration systems are relatively few in the literature. In this paper, a radial inflow turbo expander prototype is developed for expansion power recovery in the subcritical refrigeration system. The experimental results show that the prototype can operate stably within a wide speed range of up to 3200 rpm. A maximum of 10.4% isentropic efficiency is obtained when the inlet pressure is 1.7 MPa. It is also found that the optimum velocity ratio of the expander is 0.08-0.14 and shifts to higher values with the increase of the expander inlet pressure. Also, the defects of the prototype are discussed to further improve its performance. (C) 2014 Elsevier Ltd. All rights reserved.
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