An Organic Rankine Cycle for diesel engine waste heat recovery is modeled and optimized. The design parameters are nominal capacity of diesel engine, diesel operating partial load, evaporator pressure, condenser pressure and refrigerant mass flow rate. In addition four refrigerants including...

HFO−1234yf is a new refrigerant with a nearly zero global warming potential (GWP) and ozone depletion potential (ODP); it exhibits thermodynamic properties similar to HFC−134a. The potential of HFO−1234yf as a working fluid for organic Rankine cycles (ORC) is elucidated through a...

This paper proposed a thermal efficiency model theoretically based on an ideal ORC to analyze the influence of working fluid properties on the thermal efficiency, the optimal operation condition and exergy destruction for various heat source temperatures were also evaluated utilizing pinch point...

In this paper, an in-cylinder waste heat recovery system especially for turbocharged engines is proposed to improve the thermal efficiencies of internal combustion engines. Simplified recovery processes can be described as follows: superheated steam generated by engine waste heat is injected...

A design method for ORCs is newly proposed to fully couple the ORC with the heat source. The heat source is characterized by the mass flow rate, inlet and outlet heat carrier fluid temperatures. Example cases were performed to study the optimal running parameters for ORCs with constraint of...

This study analyzes the system performance of a 50kW ORC system subject to influence of various working fluids. A dimensionless “figure of merit” combining the Jakob number, condensing temperature, and evaporation temperature is proposed for quantitatively screening working fluid as far as...