TY - JOUR
TI - Performance analysis of organic Rankine cycles using different working fluids
AU - Zhu Qidi
AU - Sun Zhiqiang
AU - Zhou Jiemin
JN - Thermal Science
PY - 2015
VL - 19
IS - 1
SP - 179
EP - 191
PT - Article
AB - Low-grade heat from renewable or waste energy sources can be effectively  recovered to generate power by an organic Rankine cycle (ORC) in which the  working fluid has an important impact on its performance. The thermodynamic  processes of ORCs using different types of organic fluids were analyzed in  this paper. The relationships between the ORC’s performance parameters  (including evaporation pressure, condensing pressure, outlet temperature of  hot fluid, net power, thermal efficiency, exergy efficiency, total cycle  irreversible loss, and total heat-recovery efficiency) and the critical  temperatures of organic fluids were established based on the property of the  hot fluid through the evaporator in a specific working condition, and then  were verified at varied evaporation temperatures and inlet temperatures of  the hot fluid. Here we find that the performance parameters vary  monotonically with the critical temperatures of organic fluids. The values of  the performance parameters of the ORC using wet fluids are distributed more  dispersedly with the critical temperatures, compared with those of using  dry/isentropic fluids. The inlet temperature of the hot fluid affects the  relative distribution of the exergy efficiency, whereas the evaporation  temperature only has an impact on the performance parameters using wet fluid.