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Cool Roof Coatings on Industrial Buildings: An Energy Study of Reflective Coatings
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

To evaluate the effect of cool roof coatings containing Expancel® thermoplastic microspheres on industrial buildings, a warehouse was built-up in the computer simulation software IDA-ICE. The warehouse was modelled in line with ASHRAE 90.1. 2004 ”Energy Standard for Buildings Except Low-Rise Residential Buildings”. Four different cases were set up where the coating of the roof was the only variable. Two coatings containing Expancel® microspheres - one white and one red coating were compared to the same white coating without Expancel® microspheres and the ”base case” where there is no coating at all. The same circumstances were also implemented in a practical laboratory test using a model warehouse with a detachable roof. Four interchangeable roofs with different roof coatings constitute the various cases in the laboratory tests. A ”sun” consisting of statically mounted IR light bulbs were constructed, as well as a cooling system to measure the difference in cooling effect (maintaining a constant indoor temperature) between the different cases as a result of the change in insolation.

The results of the computational simulations show that for a warehouse placed in Houston, Texas about 50 MWh in combined heating and cooling energy can be saved yearly between the best and the worst case, a reduction of 6.2%. Changing the geographic placement of the warehouse to Tepic, Mexico the corresponding savings were determined to 83 MWh or 13.5%.

A way of determining the yearly savings in heating and cooling amount for the warehouse with a generic roof coating, only knowing the SRI value of the coating, was developed. It was determined that for every unit-increment of the SRI value the yearly savings for the warehouse placed in Houston, Texas were 718 kWh and 0.1%. The corresponding savings for the warehouse placed in Tepic, Mexico were determined to be 1252 kWh and 0.22%.

The laboratory tests showed that the indoor temperature of the model warehouse decreased by close to 16°C between the best and the worst case.

Place, publisher, year, edition, pages
2019.
Keywords [en]
Energy, coating, cool roof coatings, industrial building, reflective coating, microspheres, expancel, ida-ice
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:umu:diva-157503OAI: oai:DiVA.org:umu-157503DiVA, id: diva2:1298932
External cooperation
AkzoNobel Pulp and Performance Chemicals AB
Educational program
Master of Science Programme in Energy Engineering
Supervisors
Examiners
Available from: 2019-03-26 Created: 2019-03-25 Last updated: 2019-03-26Bibliographically approved

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Cool Roof Coatings on Industrial Buildings: An Energy Study of Reflective Coatings(3845 kB)47 downloads
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