Heat transfer analysis of recycled versus conventional green roof media

Rashid Kaveh, Shirley E. Clark

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The water quality and quantity benefits of green roofs have been well documented. However, the transfer of the sun’s heat through the roof to the building envelope has not been as well studied. This project addresses the knowledge deficit by testing thermal flux between the surface and the bottom of the green roof media operated under simulated winter and summer conditions and under saturated and dry conditions. Initial studies evaluated replacing expanded shale with crumb rubber. The results showed that when the surface was approximately 65 C, the temperature against the building envelope were 29 C for crumb rubber and 39 C for conventional media. Under saturated conditions, the initial measurements showed that crumb rubber still transfers less heat to the roof compare to the conventional material. Rubber also retained water longer, which kept the heat away from the roof due to slow evaporation of water. This translates to a considerable amount of energy saving in urban areas by using recycled tires as green roof materials. Further research will investigate other components of green roof media and the impact of vegetation on heat transfer, with the goal of improving existing models of building roof performance when a green roof is added.

Original languageEnglish (US)
Title of host publicationWorld Environmental and Water Resources Congress 2019
Subtitle of host publicationWater, Wastewater, and Stormwater; Urban Water Resources; and Municipal Water Infrastructure - Selected Papers from the World Environmental and Water Resources Congress 2019
EditorsGregory F. Scott, William Hamilton
PublisherAmerican Society of Civil Engineers (ASCE)
Pages1-6
Number of pages6
ISBN (Electronic)9780784482360
DOIs
StatePublished - 2019
Event19th World Environmental and Water Resources Congress 2019: Water, Wastewater, and Stormwater; Urban Water Resources; and Municipal Water Infrastructure - Pittsburgh, United States
Duration: May 19 2019May 23 2019

Publication series

NameWorld Environmental and Water Resources Congress 2019: Water, Wastewater, and Stormwater; Urban Water Resources; and Municipal Water Infrastructure - Selected Papers from the World Environmental and Water Resources Congress 2019

Conference

Conference19th World Environmental and Water Resources Congress 2019: Water, Wastewater, and Stormwater; Urban Water Resources; and Municipal Water Infrastructure
CountryUnited States
CityPittsburgh
Period5/19/195/23/19

All Science Journal Classification (ASJC) codes

  • Water Science and Technology

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  • Cite this

    Kaveh, R., & Clark, S. E. (2019). Heat transfer analysis of recycled versus conventional green roof media. In G. F. Scott, & W. Hamilton (Eds.), World Environmental and Water Resources Congress 2019: Water, Wastewater, and Stormwater; Urban Water Resources; and Municipal Water Infrastructure - Selected Papers from the World Environmental and Water Resources Congress 2019 (pp. 1-6). (World Environmental and Water Resources Congress 2019: Water, Wastewater, and Stormwater; Urban Water Resources; and Municipal Water Infrastructure - Selected Papers from the World Environmental and Water Resources Congress 2019). American Society of Civil Engineers (ASCE). https://doi.org/10.1061/9780784482360.001