Effect of Attic Insulation Thickness and Solar Gain in a Mild Climate

Attic air ventilation can be influenced by various vent considerations. In addition to vent ratio and location of roof vents, attic insulation thickness can be considered as an influential factor in attic air flow and temperature distribution. Most existing building codes do have a minimum requireme...

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Bibliographic Details
Published in:Energy procedia 2015-11, Vol.78, p.67-72
Main Authors: Tariku, Fitsum, Iffa, Emishaw
Format: Article
Language:English
Subjects:
Air change per hour
Attic
Heat flux
Insulation
Solar gain
Ventilation
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Summary:Attic air ventilation can be influenced by various vent considerations. In addition to vent ratio and location of roof vents, attic insulation thickness can be considered as an influential factor in attic air flow and temperature distribution. Most existing building codes do have a minimum requirement for venting parameters and type and thickness of the insulation used. In this paper, the effect of insulation thickness in attic ventilation rate, attic air temperature and heating and cooling loads in a mild climatic zone is studied. A typical mild climate summer and winter temperatures and solar radiations data are used for 24 hours transient conjugate heat transfer simulations. Results show that solar radiation has significant impact on the amount and the pattern of airflow in attic. An increase in attic insulation yields a decrease in attic ventilation during winter period, but has no effect in summer period for the climate considered. In general, the higher the attic insulation thickness is the lower the building takes advantage of solar gain during winter period, but higher insulation levels tend to be advantageous during summer cooling period.
ISSN:1876-6102
1876-6102
DOI:10.1016/j.egypro.2015.11.116