Reducing roof solar heat gain by using double-skin ventilated roofs

Joint Authors

Ghanim, Muhannad R.
Ahmad, Sabah Tariq

Source

Engineering and Technology Journal

Issue

Vol. 38, Issue 3A (31 Mar. 2020), pp.402-411, 10 p.

Publisher

University of Technology

Publication Date

2020-03-31

Country of Publication

Iraq

No. of Pages

10

Main Subjects

Engineering Sciences and Information Technology

Abstract EN

Double skin ventilated roof is one of the important passive cooling techniques to reduce solar heat gain through roofs.

In this research, an experimental study was performed to investigate the thermal behaviour of a double skin roof model.

The model was made of two parallel galvanized steel plates.

Galvanized steel has been used in the roof construction of industrial buildings and storehouses in Iraq.

The effect of inclination angle (ϴ) from the horizontal and the spacing (S) between the plates was investigated at different radiation intensities.

It is found that using a double skin roof arrangement with a sufficient air gap (S) can reduce the heat gain significantly.

The higher the inclination angle (ϴ) the higher the ventilation rate, the lower the heat gain through the roof.

In this study, increasing the air gap from 2 cm to 4 cm reduced the heat gain significantly but when the gap was further increased to 6 cm, the reduction in the heat flux was insignificant.

A dimensionless correlation was also reduced between Nusselt number () and the single parameter where L is the channel length.

This correlation can be handily utilized for designing of engineering applications dealing with high temperature difference natural convection heat transfer.

American Psychological Association (APA)

Ghanim, Muhannad R.& Ahmad, Sabah Tariq. 2020. Reducing roof solar heat gain by using double-skin ventilated roofs. Engineering and Technology Journal،Vol. 38, no. 3A, pp.402-411.
https://search.emarefa.net/detail/BIM-948662

Modern Language Association (MLA)

Ghanim, Muhannad R.& Ahmad, Sabah Tariq. Reducing roof solar heat gain by using double-skin ventilated roofs. Engineering and Technology Journal Vol. 38, no. 3A (2020), pp.402-411.
https://search.emarefa.net/detail/BIM-948662

American Medical Association (AMA)

Ghanim, Muhannad R.& Ahmad, Sabah Tariq. Reducing roof solar heat gain by using double-skin ventilated roofs. Engineering and Technology Journal. 2020. Vol. 38, no. 3A, pp.402-411.
https://search.emarefa.net/detail/BIM-948662

Data Type

Journal Articles

Language

English

Notes

Includes bibliographical references : p. 410-411

Record ID

BIM-948662