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

[11] A numerical study of solar chimney for natural ventilation of buildings with heat recovery [J].

Gan, G ;

Riffat, SB .

APPLIED THERMAL ENGINEERING, 1998, 18 (12) :1171-1187

[12] Simulation of buoyancy-induced flow in open cavities for natural ventilation [J].

Gan, GH .

ENERGY AND BUILDINGS, 2006, 38 (05) :410-420

[13] AN EXPERIMENTAL STUDY OF COLD INFLOW INTO CHIMNEYS [J].

JORG, O ;

SCORER, RS .

ATMOSPHERIC ENVIRONMENT, 1967, 1 (06) :645-&

[14]

Khanal R., 2011, ANZIAM J, V52, pC899

[15] Solar chimney-A passive strategy for natural ventilation [J].

Khanal, Rakesh ;

Lei, Chengwang .

ENERGY AND BUILDINGS, 2011, 43 (08) :1811-1819

[16] Unsteady natural convection on an evenly heated vertical plate for Prandtl number Pr<1 -: art. no. 066309 [J].

Lin, WX ;

Armfield, SW .

PHYSICAL REVIEW E, 2005, 72 (06)

[17] Treatment of the inlet boundary conditions in natural-convection flows in open-ended channels [J].

Marcondes, F ;

Maliska, CR .

NUMERICAL HEAT TRANSFER PART B-FUNDAMENTALS, 1999, 35 (03) :317-345

[18] Experimental investigations on solar chimney for room ventilation [J].

Mathur, Jyotirmay ;

Bansal, N. K. ;

Mathur, Sanjay ;

Jain, Meenakshi ;

Anupma .

SOLAR ENERGY, 2006, 80 (08) :927-935

[19] Investigation of fluid flow and heat transfer in a vertical channel heated from one side by PV elements .1. Numerical study [J].

Moshfegh, B ;

Sandberg, M .

RENEWABLE ENERGY, 1996, 8 (1-4) :248-253

[20]

Patankar SV., 2009, Numerical heat transfer and fluid flow, V1

← 1 2 3 →