Optimization of the air gap spacing in a solar water heater with double glass cover

Paper

AL-Khaffajy, M. and Mossad, R.. 2011. "Optimization of the air gap spacing in a solar water heater with double glass cover." Soria, Julio (ed.) 9th Australasian Heat and Mass Transfer Conference. Melbourne, Australia 02 - 04 Nov 2011 Melbourne, Australia .
Paper/Presentation Title

Optimization of the air gap spacing in a solar water heater with double glass cover

Presentation TypePaper
AuthorsAL-Khaffajy, M. (Author) and Mossad, R. (Author)
EditorsSoria, Julio
Journal or Proceedings TitleProceedings of the 9th Australasian Heat and Mass Transfer Conference (9AHMTC)
ERA Conference ID60100
Number of Pages9
Year2011
Place of PublicationMelbourne, Australia
Conference/Event9th Australasian Heat and Mass Transfer Conference
Australasian Heat and Mass Transfer Conference
Event Details
9th Australasian Heat and Mass Transfer Conference
Parent
Australasian Heat and Mass Transfer Conference
Event Date
02 to end of 04 Nov 2011
Event Location
Melbourne, Australia
Event Details
Australasian Heat and Mass Transfer Conference
Abstract

A parametric study has been conducted in a solar water heater with double glass cover, in order to minimize heat losses. The air gap spacing between the absorber and the inner glass cover (L1) and between the two glass covers (L2) for the system with 0.7 m x 1.35 m absorber area were varied within the range of 15-50 mm to investigate which combination of gap sizes (L1, L2) would result in minimum total heat losses i.e. including radiation and convection losses. Three-dimensional CFD models have been developed using ANSYS 13.0-FLUENT software. The continuity, momentum and energy equations have been solved, in steady state condition, using pressure-based type solver. A realizable k-є turbulent model has been used, and surface to surface radiation was included. The results showed that as the size of the air gap increases, the velocity of the air in the gap increases which increased the convection part however the total heat losses decreased. The optimum combinations for the present case have been found to be 40, 25 mm, since the overall heat loss was found to be the lowest (216.4 W).

Keywordssolar water heater, air gap spacing, double glass cover
ANZSRC Field of Research 2020401706. Numerical modelling and mechanical characterisation
Public Notes

No evidence of copyright restrictions preventing deposit.

Byline AffiliationsFaculty of Engineering and Surveying
Department of Mechanical and Mechatronic Engineering
Institution of OriginUniversity of Southern Queensland
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