Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : December 04, 2021
The optimization of design parameters, the compression ratio, heat conductance ratios of the three heat exchangers was conducted. Three heat exchangers, the heater, the regenerator and the cooler are assumed to have zero-volume and finite heat conductance for simplicity. Finite flow loss is considered: Instantaneous pressure drop follows the laminar steady pressure drop for the instantaneous velocity of the fluid. The cross sectional area and the lengths of the heat exchangers are introduced in the calculation of flow loss, but it is neglected in the thermodynamic cycle calculation. Net power and efficiency take the maximum at a conductance ratio of the cooler and the heater of around unity. The conductance of the regenerator has opposite effects on net power and efficiency: Net power becomes larger for smaller conductance of the regenerator, and efficiency becomes higher for larger conductance. It is found to be possible to optimize the parameters by maximizing efficiency for a condition to produce a certain net power. This power is taken 50%, for instance, of the maximum power realized when the heat conductance of the regenerator is set zero.
