The selection of working fluid has great influence on the organic Rankine cycle（ORC）for diesel engine exhaust waste heat recovery. Through the experiment and theoretical calculation，the exhaust waste heat characteristics of a 6cylinder diesel engine under transient operating conditions were analyzed，the initial conditions for organic working fluid selection were proposed，then the thermodynamic performance and economic performance of the ORC system for diesel engine exhaust waste heat with eight organic working fluids met initial conditions were compared and investigated. The results show that the ORC system with R420A can reach the maximum thermal efficiency of 6.83% in the evaporation pressure range of eight organic working fluids and its total net power output，maximum net power output and average net power output are higher than those of other organic working fluids which are 306.81 kW，9.769 kW and 2.005 kW respectively under diesel engine transient operating conditions. The system with R420A has lower initial investment cost, which is only second to R417A and R437A，but its levelized energy cost (LEC) is the lowest.
CHAI Junlin
,
TIAN Rui
,
YANG Fubin2
,
ZHANG Hongguang
,
JI Ping
. Working Fluid Selection of Organic Rankine Cycle System for Diesel Engine Exhaust Waste Heat[J]. Vehicle Engine, 2019
, 0(3)
: 58
-63
.
DOI: 10.3969/j.issn.1001-2222.2019.03.009
