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Normalized charging exergy performance of stratified sensible thermal stores

机译:分层显热存储的归一化充电火用性能

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This paper presents the performance assessment of stratified sensible thermal energy stores (SSTES) on the basis of the normalized exergy efficiency, (eta) over bar (x). Assessments based on (eta) over bar (x) provide comparisons with performances of both the perfectly stratified and the fully mixed stores, which offer the best and worst performances, respectively. This is in contrast with energy and exergy efficiencies, which compare SSTES with only the perfectly stratified store. A dimensionless unsteady axisymmetric model of vertical cylindrical SSTES was implemented using a finite volume numerical scheme. The effect of some significant parameters on SSTES performance were considered by performing computations for aspect ratios (AR) between 1 and 4, Peclet number (Pe(D)) varying from 5 x 10(3) to 100 x 10(3), Richardson number (Ri) varying from 10 to 10(4), and overall heat loss coefficients (U) varying from 0 to 100 W m(-2) K-1.(eta) over bar (x) increases with Pe(D), Ri and AR, with the most significant increases occurring at low values of these parameters, and appreciable increases are no longer obtained beyond Pe(D) approximate to 30 x 10(3), Ri approximate to 10(3) and AR approximate to 3. (eta) over bar (x) also falls monotonically as the U values increase. (C) 2016 Elsevier Ltd. All rights reserved.
机译:本文基于归一化的火用效率(eta)(bar)(x),介绍了分层显热储能(SSTES)的性能评估。基于(η)超过(x)的评估可以与完全分层商店和完全混合商店的性能进行比较,后者分别提供最佳和最差的性能。这与能源效率和火用效率形成对比,后者仅将SSTES与完美分层的商店进行比较。使用有限体积数值方案实现了垂直圆柱SSTES的无量纲非定常轴对称模型。理查德森(Richardson)通过计算1-4之间的纵横比(AR)来考虑某些重要参数对SSTES性能的影响,佩克莱特数(Pe(D))从5 x 10(3)到100 x 10(3)不等数(Ri)从10到10(4)不等,总热损失系数(U)从0到100 W m(-2)K-1.bar(x)上的η随着Pe(D)的增加而增加,Ri和AR,最显着的增加发生在这些参数的低值处,并且在Pe(D)大约为30 x 10(3),Ri大约为10(3)和AR大约为时,不再获得可观的增加。 3.随着U值的增加,横条(x)上的(eta)也单调下降。 (C)2016 Elsevier Ltd.保留所有权利。

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