Research Papers

A Simulation of the Thermal Performance of a Small Solar Chimney Already Installed in a Building

[+] Author and Article Information
J. Arce

e-mail: jesuso@cenidet.edu.mx

J. P. Xamán

e-mail: jxaman@cenidet.edu.mx

G. Álvarez

e-mail: gaby@cenidet.edu.mx,
Mechanical Engineering Department,
Centro Nacional de Investigación y
Desarrollo Tecnológico
Cuernavaca, Morelos 62490, México

M. J. Jiménez

e-mail: mjimenez@psa.es

R. Enríquez

e-mail: ricardo.enriquez@ciemat.es

M. R. Heras

e-mail: mrosario.heras@ciemat.es
Energy Efficiency in Buildings Unit,
Centro de Investigaciones Energéticas,
Medioambientales y Tecnológicas (CIEMAT),
Madrid E-28040, Spain

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY. Manuscript received November 9, 2010; final manuscript received June 26, 2012; published online August 9, 2012. Assoc. Editor: Gregor P. Henze.

J. Sol. Energy Eng 135(1), 011005 (Aug 09, 2012) (10 pages) Paper No: SOL-10-1167; doi: 10.1115/1.4007088 History: Received November 09, 2010; Revised June 26, 2012

In this paper we present a theoretical study of a small solar chimney. The dimensions of the solar chimney channel are 1.95 m high, 1.70 m wide, and 0.24 m deep. The channel of the solar chimney has in its backside a metallic plate as a solar heat absorber, and it is attached to a concrete wall, which acts as storage and thermal insulation. On the front part of the chimney a glass cover is used to decrease the heat losses to the exterior. For this theoretical study, the steady-state energy balance equations were solved numerically for each element of the solar chimney. The results showed the temperature profiles for the glass cover, the air inside the channel, and the metallic plate. Also, the air mass flow rate was determined. When solar irradiance increases from 100 to 700 W/m2, the maximum instantaneous efficiency of the system varies from 28% to 37%, and also, the volumetric flow rate increases from 61 to 147 m3/h.

Copyright © 2012 by ASME
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Fig. 1

Schematic diagram of a cross section view of a building with a solar chimney

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Fig. 2

Physical model of the solar chimney

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Fig. 3

Mesh of the physical model of the solar chimney

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Fig. 4

Section one for solar chimney

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Fig. 5

(a) Thermal network of the solar chimney and (b) equivalent thermal network

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Fig. 6

Heat balance of the air flow in a control volume

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Fig. 9

(a) Temperature variation for Tp versus the length of solar chimney for six mesh sizes (16 to 250 control volumes). (b) Temperature and mass flow rate variations versus the mesh size.

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Fig. 10

Temperature variation along the solar chimney

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Fig. 7

Exterior temperature hourly and horizontal and vertical irradiances, on June 27, 2009

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Fig. 8

Wind velocity hourly on June 27, 2009

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Fig. 13

Ten solar chimneys attached to the outer upper wall hall of a building

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Fig. 14

Schematic lateral view of sensor location in the solar chimney of the offices 1 and 2

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Fig. 15

Schematic frontal view of sensor location in the solar chimney of the offices 1 and 2

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Fig. 11

Profiles of average temperature for the different elements of the solar chimney versus SVGSR

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Fig. 12

Efficiency and volumetric flow rate versus vertical south irradiance (SVGSR)




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