Results and Discussion For an HW converter (the heat engine) operating on an air standard Stirling cycle, the efficiency tjhw can be put in the form: [3] and d is the fractional deviation from ideal regeneration, R is the gas constant, Cv is the heat capacity of the working fluid at constant volume, and V] and V2 are the specific volumes of the constant volume regeneration process for the cycle (V,/V2 is the overall compression ratio). Note that regeneration is perfectly efficient when d = 0 in equation 25, and tjhw reduces to the ideal Carnot cycle efficiency. For the Ericsson cycle, the efficiency 7)HW is also given by equation 24, but x has the following form where Cp is the heat capacity of the working fluid at constant pressure, ?! and P2 are the pressures at which the two isobaric regeneration processes take place, and the other symbols have been defined above (Further details for these cycles are available in the literature) [3]. In order to determine r; the power generated must be evaluated, which can be done by substituting equations 1 and 24 into equation 21:
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