Flow reversal effects on buoyancy induced air flow in a solar chimney

被引：73

作者：

Khanal, Rakesh ^{[1
]}

Lei, Chengwang ^{[1
]}

机构：

[1] Univ Sydney, Sch Civil Engn, Sydney, NSW 2006, Australia

来源：

SOLAR ENERGY | 2012年 / 86卷 / 09期

关键词：

Natural convection; Solar chimney; Reverse flow; Penetration depth; Ventilation; NATURAL VENTILATION; VERTICAL CHANNEL; HEAT-FLUX; CONVECTION; WALL; BUILDINGS;

D O I：

10.1016/j.solener.2012.06.015

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

This paper reports a numerical investigation of flow reversal effects on the buoyancy induced air flow in a solar chimney for ventilation applications over a range of controlling parameters. The reverse flow phenomenon is quantitatively examined by calculating its penetration depth. In order to suppress the reverse flow and enhance ventilation performance, a configuration with an inclined passive wall is proposed as a new design; the effectiveness of this design has been examined over the Rayleigh number range of 10(9) <= Ra <= 10(11). It is identified that there exists an optimum inclination angle corresponding to an optimum aspect ratio at which the mass flow rate is the maximum for a given Rayleigh number. The numerical results are supported by a scaling argument and a flow visualization experiment. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：2783 / 2794

页数：12

共 23 条

[1] Thermal and fluid dynamic behaviors in symmetrical heated channel-chimney systems [J].

Andreozzi, Assunta ;

Buonomo, Bernardo ;

Manca, Oronzio .

INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW, 2010, 20 (6-7) :811-833

[2] Experimental study for natural ventilation on a solar chimney [J].

Arce, J. ;

Jimenez, M. J. ;

Guzman, J. D. ;

Heras, M. R. ;

Alvarez, G. ;

Xaman, J. .

RENEWABLE ENERGY, 2009, 34 (12) :2928-2934

[3] Scaling investigation of the natural convection boundary layer on an evenly heated plate [J].

Armfield, S. W. ;

Patterson, John C. ;

Lin, Wenxian .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2007, 50 (7-8) :1592-1602

[4] Study of the natural convection phenomena inside a wall solar chimney with one wall adiabatic and one wall under a heat flux [J].

Bacharoudis, Evangellos ;

Vrachopoulos, Michalis Gr. ;

Koukou, Maria K. ;

Margaris, Dionysios ;

Filios, Andronikos E. ;

Mavrommatis, Stamatis A. .

APPLIED THERMAL ENGINEERING, 2007, 27 (13) :2266-2275

[5] Modeling of window-sized solar chimneys for ventilation [J].

Bansal, NK ;

Mathur, J ;

Mathur, S ;

Jain, M .

BUILDING AND ENVIRONMENT, 2005, 40 (10) :1302-1308

[6] An analytical and numerical study of solar chimney use for room natural ventilation [J].

Bassiouny, Ramadan ;

Koura, Nader S. A. .

ENERGY AND BUILDINGS, 2008, 40 (05) :865-873

[7] Air flow and thermal efficiency characteristics in solar chimneys and Trombe Walls [J].

Burek, S. A. M. ;

Habeb, A. .

ENERGY AND BUILDINGS, 2007, 39 (02) :128-135

[8] Investigation on thermal performance of glazed solar chimney walls [J].

Chantawong, P ;

Hirunlabh, J ;

Zeghmati, B ;

Khedari, J ;

Teekasap, S ;

Win, MM .

SOLAR ENERGY, 2006, 80 (03) :288-297

[9] An experimental investigation of a solar chimney model with uniform wall heat flux [J].

Chen, ZD ;

Bandopadhayay, P ;

Halldorsson, J ;

Byrjalsen, C ;

Heiselberg, P ;

Li, Y .

BUILDING AND ENVIRONMENT, 2003, 38 (07) :893-906

[10] Experimental verification of induced ventilation [J].

Drori, U ;

Dubovsky, V ;

Ziskind, G .

JOURNAL OF ENVIRONMENTAL ENGINEERING, 2005, 131 (05) :820-826

← 1 2 3 →