Evaluation of the Passive Cooling Potential of Thermal Mass Inherent in Medium to Large Commercial Buildings
Publication: Journal of Architectural Engineering
Volume 27, Issue 2
Abstract
Typical commercial construction inherently contains large surface areas of relatively thin mass located in the floor slabs. This research asks how effective this mass could be for passive cooling, relative to other mass depths, if it were to be exposed and used as thermal mass. Although much of the rich literature on thermal mass has been conducted with far greater mass depths, a more limited amount of research suggests that because the surface heat transfer rate is limited, the focus should be on the surface area of exposed mass, not its depth. This presents an opportunity for more buildings to behave more thermally massively, if the mass inherent in typical floor slabs contains utility, particularly over diurnal cycles. In all climates analyzed, it was found that there is a pronounced shoulder where energy savings from passive cooling of increasing mass depths was steep until roughly 7.5–10 cm, and beyond this point the achieved energy savings diminished rapidly. When considering the embodied energy of concrete, the incremental benefit of added mass beyond a typical topping slab of 10 cm does not justify the incremental embodied energy cost from a total energy standpoint alone.
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Acknowledgments
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
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Published In
Journal of Architectural Engineering
Volume 27 • Issue 2 • June 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: May 9, 2020
Accepted: Nov 19, 2020
Published online: Mar 10, 2021
Published in print: Jun 1, 2021
Discussion open until: Aug 10, 2021
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