Abstract
Waste heat recovery is an actual goal. The best way to valorize waste heat is to use it directly with the appropriate level of temperature. If the temperature level is insufficient, many reverse machine configurations are available in order to obtain the appropriate conditions (the most known are heat pumps and heat transformers). Finally, the remaining unused heat could be converted to any noble form of energy (mechanical, electrical essentially). We propose here to examine, with a new point of view, the thermomechanical conversion limit of waste heat. This limit corresponds to adiabatic conversion for an endo-reversible Carnot engine, with a perfect thermal contact at the atmospheric sink (supposed infinite). The Carnot–Chambadal model version is applied to latent and sensible heat recovery cases. The results associated with these two cases differ fundamentally. Comments are provided on the two studied cases, and new criteria to characterize the corresponding waste heat recovery are proposed.
Highlights
Waste heat recovery is essential for increasing energy efficiency in different industry sectors.Increasing energy costs and environmental concerns provide strong motivation for implementing more and newer methods and technologies for waste heat recovery.Recent papers [1,2,3,4] prove that this topic is a well-studied one by the analysis of thermodynamic models for the simulation and optimization of power systems [1,2], as well as energy and exergy analysis of waste heat recovery systems [3,4]
These new criteria are defined as the ratio of the maximum recoverable power divided by the energy rate or exergy rate available between the heat source and the ambient
Waste heat recovery can be achieved through two main forms: the latent heat and sensible heat
Summary
Waste heat recovery is essential for increasing energy efficiency in different industry sectors. Recent papers [1,2,3,4] prove that this topic is a well-studied one by the analysis of thermodynamic models for the simulation and optimization of power systems [1,2], as well as energy and exergy analysis of waste heat recovery systems [3,4]. The paper topic is mainly concerned by fundamental aspects and methodology than by aspects developed regarding process sites, even if these developments become more and more explored [2,3,21,22,23,24] For these reasons, the paper presents two different models that can be used: firstly, the latent heat valorization one, and secondly, the sensible heat valorization, both considering the finite source and sink. Choose the technical solutions for an efficient waste heat recovery by different technologies
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