A thermodynamic model of low-temperature solar oganic rankine vapor compressor refrigeration system was built by using the Engineering Equation Solver (EES) software. Four working fluids, including R123, R245fa, R600a and R1234ze (E) were preselected from HCFC, HFC, HC and HFO, respectively. The influences of generation, condensation and evaporation temperature on the thermal efficiency, exergy efficiency, the UA value and EPUA (thermal efficiency per UA value), were studied. Further, the effects of heat transfer temperature differences of the boiler, condenser and evaporator on the UA and EPUA were also investigated. The results showed that the thermal efficiency, exergy efficiency and UA value all increased with the increase of generation and evaporation temperature, and decreased with the increase of condensation temperature. There existed an optimal condensation temperature of 42oC and evaporation temperature of 4oC to get a maximal EPUA value. The impact degree of evaporation temperature on system performance was less than that of condensation temperature, greater than that of generation temperature. In terms of the largest thermal efficiency and exergy efficiency, the order went as follows: R123, R245fa, R600a, and R1234ze(E). Analyzing on the basis of thermodynamics, R123 was the most suitable working fluid. The UA value first increased and then decreased with the increase of the heat transfer temperature differences of the boiler. Higher heat transfer temperature differences of the condenser led to higher UA value. The heat transfer temperature difference of the evaporator had little impact on the UA value.
WANG Ling-bao
,
LIU Li-na
,
LI Hua-shan
,
BU Xian-biao
,
GONG Yu-lie
. Optimization of Working Fluid and Operation Condition for Organic Rankine Vapor Compressor Refrigeration System Driven by Solar Energy[J]. Advances in New and Renewable Energy, 2017
, 5(5)
: 386
-393
.
DOI: 10.3969/j.issn.2095-560X.2017.05.010
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