Optimal mixed convection for maximal energy recovery with vertical porous channel (solar wall)

被引：13

作者：

Boutin, Yanik ^{[1
]}

Gosselin, Louis ^{[1
]}

机构：

[1] Univ Laval, Dept Genie Mecan, Quebec City, PQ G1V 0A6, Canada

来源：

RENEWABLE ENERGY | 2009年 / 34卷 / 12期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Solar wall; Natural convection; Mixed convection; Solar chimney; Vertical channel; Natural ventilation; LOCAL THERMAL-EQUILIBRIUM; HEAT-TRANSFER; NATURAL-CONVECTION; AIR-FLOW;

D O I：

10.1016/j.renene.2009.06.007

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A vertical open-ended channel filled with a porous medium, with an imposed heat flux and a heat loss coefficient on one of its walls, is studied numerically. A fan can enhance the self-driven flow, and therefore a mixed convection regime is considered. The objective is to maximize the overall energy recovery (heat transfer to the fluid minus fan power). Correlations are developed for optimal pressure drop to be imposed by the fan and maximal energy recovery, as a function of the Rayleigh number, the channel aspect ratio, and the heat loss coefficient. The optimal allocation of the total energy losses (i.e., sum of the heat loss and fan power) is shown. Potential applications include solar wall and solar chimney used for ventilation and preheating of makeup air in buildings. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：2714 / 2721

页数：8

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