Abstract
Heat transfer during compression and expansion occurs in almost every reciprocating energy conversion machine and can have large effects on its Performance. It is particularly important in closed-cycle machines such as Stirling engines and pulse-tube refrigerators. Heat flow adding to the gas is the increasing rate of internal energy plus the power done to the gas and calculated from measured pressure changing with time. Apparatus have a 39mm diameter, 28mm stroke piston and 336cm3 reserver. The compression ratio is 1.1. The piston is driven by D.C. motor to allow speed adjustment. Surface area is changed with inserting stacks of stainless steal plates. Measurement was carried out for a range of pressure, frequency, surface area, and for several gases. Experimental data were correlated with non-dimensional parameters for the design of Stirling engines or pulse tube refrigerators.
