Abstract
The effects of heat conduction in a regenerator matrix and unbalanced heat-capacity rates on the second-law efficiency of rotary regenerators are documented. The results show that the maximum second-law efficiency increases as the ratio of the heat-capacity rate increases. The overall number of transfer units NTU o corresponding to this optimum also increases with heat capacity rate C ∗ . Including the effect of heat conduction in the regenerator matrix lowers the second-law efficiency and increases the NTU o required to obtain the maximum second-law efficiency. These results can be used to design and optimize the performance of a regenerator considering both heat transfer and pressure drop effects.
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