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Date of Publication:2012-01-01

Journal:化工学报

Issue:1

Page Number:96-102

ISSN No.:0438-1157

Abstract:A dynamic coupled model of a two-stage compression system with variable capacity reflecting the generation of intermediate pressure is constructed based on the rotary compressor geometry, the mass and energy conservation equations. The model is verified by the experiment. According to the results of simulation and experiment, the variation of the intermediate pressure with time and characteristics of variable operating modes were analyzed. The results show that the intermediate pressure has pulse characteristics, but the pulse amplitude is relatively small by comparison to the time-averaged value. Among the factors affecting the intermediate pressure, the ratio of theoretical displacement of the low compressor to that of the high one is the most significant one and condensation temperature is less significant than evaporation temperature. The heating capacity increases linearly with the intermediate pressure, while the change of the system COP for heating increases with intermediate pressure first and then decreases, and there exists an optimal value. © All Rights Reserved.

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