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An algebraic scroll expander has been fabricated and tested in a R134a Rankine cycle with heat source of 20 kW.For the operating conditions of 20  26 bar and 90  93 ℃ at the expander inlet and 8  9 bar at the outlet, the expander produced the shaft output power of about 0.6  0.7 kW in the operating speed range of 1500  2000 rpm. These correspondto the expander efficiency of 40~45%. The volumetric efficiency increased with increasing of the expander speed, reachingto 80% at 2000 rpm. Comparing to numerical simulation results, mechanical efficiency from the test data was found tobe considerably low by as much as 30%, indicating that reduction in the frictional loss should be made to improve the scroll expander efficiency. Key words Scroll expander( ), Algebraic spiral(), Waste heat recovey(), Rankine cycle( ), Shaft power()†Corresponding author, E-mail: kimhj@incheon.ac.kr  h  enthalpy [kJ/kg] H  wrap height [m] L  power [W]  mass flow rate [kg/s]

Effects of Channel Amplitude Ratio on Flow and Heat Transfer Characteristics of Primary Surface Heat Exchanger for ORC