Entransy and entropy revisited |
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Authors: | GuoJie Hu BingYang Cao ZengYuan Guo |
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Institution: | Key Laboratory for Thermal Science and Power Engineering of Ministry of Education School of Aerospace, Tsinghua University, Beijing 100084, China |
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Abstract: | Entransy, a recently developed concept, is the central physical quantity characterizing heat transfer processes not related
to heat-to-work conversions. The entransy of an object pertains to the nature of the potential energy of heat in a thermal
field and describes its heat transfer ability. In the present study, we revisit this concept, and develop its relationship
to state and process quantities. This then enables a direct comparison to the more familiar concept, entropy, the central
physical quantity in thermodynamics. The comparison helps to identify the role entransy has in heat transfer processes and
highlight under what conditions state and process quantities related to entransy can be distinguished in such processes. As
to embody the entransy loss due to work expended between the system and its environment for the irreversible heat conduction
in gases, new quantities, available entransy flow and available system entransy are introduced. Both the entransy of solids
and the available system entransy of gases are state quantities and their changes correspond to the entransy flow and the
available entransy flow respectively. Thus there is no need to stress the difference between process quantity and state quantity
in heat transfer. |
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Keywords: | entransy available entransy state quantity process quantity |
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