The authors have obtained minimum conditions for the irreversibility and the contact surface of double-flow heat exchange with a prescribed total heat load with various constraints imposed on the set of permissible flow temperatures. Consideration has been given to flows with a constant heat capacity and to flows with a temperature-dependent heat capacity and, in particular, changing their phase state, that are of arbitrary high heat capacity at the boiling/condensation point. It has been shown that the obtained relations yield the existence of realizability limits of the process and relations have been derived to calculate them. For variable-heat-capacity flows, the entropy production in their mixing has been obtained.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 95, No. 2, pp. 289–297, March–April, 2022.
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Tsirlin, A.M., Gagarina, L.G. Calculation of Heat Exchange for Variable-Heat-Capacity Flows. J Eng Phys Thermophy 95, 283–290 (2022). https://doi.org/10.1007/s10891-022-02482-2
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DOI: https://doi.org/10.1007/s10891-022-02482-2