Abstract
A closed Brayton cycle piston engine could use any high- or low-grade fuel, including unprocessed biomass or coal. Potential applications include small stationary power plants, and engines for vehicles. As a step toward assessing the feasibility of such an engine, calculations are described which allow one to compare the closed Brayton engine to an internal combustion (I.C.) piston engine with regard to efficiency, power per unit displacement, peak cylinder pressure, and coolant loading. As part of the calculations, mechanical efficiency, valve losses, and optimum pressure ratio are determined using methods developed for I.C. engines. It is shown that efficiency and power density are comparable to those of an I.C. engine, while pressure and coolant load are well within the range encountered in an I.C. engine.
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