Thermodynamics and Energy


Further Insights on the New Concept of Heat for Open Systems

Authors: Juan Ramón González Álvarez

A new definition of heat for open systems, with a number of advantages over previous definitions, was introduced in [2013}; Int. J. Therm., 16(3), 102--108]. We extend the previous work by analyzing the production of entropy and showing that the new definition of heat appears naturally as the proper flow [«flux density»] conjugate to the gradient of temperature, with the previous definitions only considering a subset of the physical effects associated to this gradient. We also revisit the transfer of heat in multicomponent systems, confirming the identity derived in the previous work for the identification of thermal effects associated to each one of the chemical potentials in the system. The new definition of heat was previously obtained within the scope of the traditional thermodynamics of irreversible processes (TIP), which has a limited field of applicability to macroscopic systems with no too strong gradients and not too fast processes. We extend now the new definition of heat to more general situations and to the quantum level of description using a standard non-commutative phase space, with the former TIP-level definition recovered from partial integration.

Comments: 7 Pages.

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[v1] 2015-10-01 06:18:12

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