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Titre
Thermally driven refrigerators: Equivalent low-dissipation three-heat-source model and comparison with experimental and simulated results
Autor(es)
Sujet
Thermally driven refrigerator
Low-dissipation assumption
Three-heat-source refrigerator model
Bound of performance coefficient
Comparison with experimental data
Clasificación UNESCO
2213 Termodinámica
Fecha de publicación
2019-08
Éditeur
Elsevier Science Publishers (Amsterdam, Países Bajos)
Citación
Energy Conversion and Management. https://doi.org/10.1016/j.enconman.2019.111917
Resumen
[EN]In order to investigate the performance of a class of thermally driven refrigerators, usually driven by low-grade
thermal energy, a generic thermodynamic model of three-heat-source refrigerator without involving any specific
heat-transfer law is put forward by adopting low-dissipation assumptions. Based on the proposed model, the
analytical expressions for the coefficient of performance (COP) and cooling power of the system are derived in
terms of well-defined dissipation parameters and contact time durations between the system and heat reservoirs.
One essential parameter accounting for the size ratio of the two coupled subsystems inside the overall system is
introduced in light of the practical meaning of the reversible entropy change. With the help of the aforementioned
parameter, the optimal relation between the COP and cooling power is obtained. The optimal operation
region and optimal construction of the overall system are further determined for the first time. In addition, the
influences of the dissipation and temporal symmetries are discussed in detail, according to which the upper and
lower bounds of the COP at maximum cooling power are firstly obtained under two extreme situations.
Experimental and simulated data from previous reported works are collected to illustrate the validity and
practical significance of the proposed model and associated results. A limit case is presented to highlight the
generality of the model.
URI
DOI
10.1016/j.enconman.2019.111917
Aparece en las colecciones
- GIOETFE. Artículos [53]