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when the engine running at high speed and low torque working condition, BSFC has bigger values; when engine speed being roundly 1100r/min and torque being roughly 1300N·m, BSFC is minimum. The power output of the expander is computed with the equation below. Fig. 1. The variation of the available exhaust energy. m ( h 4 s - h 3 ) Fig. 2. The variation of the BSFC of the diesel engine. III. ORC MODEL INTRODUCTION A set of simplified ORC system is designed to recover the exhaust energy of the vehicle diesel engine, the exhaust temperature, as the high temperature heat source of the ORC system, is used for heating the organic working fluids. Fig. 3 is the schematic diagram of the ORC system, mainly covering the diesel engine, evaporator, expander, condenser, liquid reservoir and pump. The working fluids chosen for the ORC system is R245fa. Fig. 3. The schematic diagram of the ORC system. Fig. 4 is T-s diagram of the vehicle diesel engine-ORC combined system. Wnet Ws -Wp Fig. 4. T-s diagram of vehicle diesel engine-ORC combined system. IV. INTERPRETATION OF RESULT With research, we concluded that, when engine torque is Journal of Clean Energy Technologies, Vol. 3, No. 5, September 2015 341 W m ( h - h ) m ( h - h ) ( 3 ) s 12 12ss The heat exchange amount of the condensation process is computed with the equation below. Q c m ( h 2 - h 3 ) ( 4 ) The power consumed by the pump is computed with the equation below. W p m ( h 4 - h 3 ) The heat exchange amount of the heat absorbing process ( 5 ) ( 6 ) (7) In order to evaluate the running performance of the combined system, we proposed a concept called engine thermal efficiency increasing ratio (ETEIR), output energy density of working fluid (OEDWF), waste heat recovery efficiency (WHRE) and Improvement ratio of brake specific fuel consumption. The equation for computing the ETEIR is as follows: The net power output of the ORC system. ETEIR (Wice Wnet)/Qfuel-Wice/Qfuel (8) p is computed with the equation below. Q m ( h - h ) e14 Wice/Qfuel The equation for computing the OEDWF is as follows: The equation for computing the WHRE is as follows: W H R E W n e t Qava OEDWF Wnet m (9) ( 1 0 ) Improvement rate of BSFC is computed with equation below. b s f c m f u e l / W i c e m f u e l / ( W i c e W n e t ) mfuel/Wice ( 1 1 )PDF Image | Performance Analysis of the Organic Rankine Cycle (ORC) System under Engine Various Operating Conditions
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