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Reflective coatings for interior and exterior of buildings and improving thermal performance
Energy and Environmental Technology, Dalarna University, Falun, Sweden.
SSAB Europe, Borlänge, Sweden.
Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik.
Energy and Environmental Technology, Dalarna University, Falun, Sweden .
2013 (Engelska)Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 103, s. 562-570Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The importance of reducing building energy usage and thriving for more energy efficient architectures, has nurtured creative solutions and smart choices of materials in the last few decades. Among those are optimizing surface optical properties for both interior and exterior claddings of the building. Development in the coil-coating steel industries has now made it possible to allocate correct optical properties for steel clad buildings with improved thermal performance. Although the importance of the exterior coating and solar gain are thoroughly studied in many literatures, the effect of interior cladding are less tackled, especially when considering a combination of both interior and exterior reflective coatings. This paper contemplates the thermal behavior of small cabins with reflective coatings on both interior and exterior cladding, under different conditions and climates with the aim to clarify and point out to the potential energy saving by smart choices of clad coatings.

Ort, förlag, år, upplaga, sidor
Oxford: Elsevier , 2013. Vol. 103, s. 562-570
Nyckelord [en]
Reflective coatings, Low energy building, Energy simulation, Total solar reflectance, Interior thermal emittance
Nationell ämneskategori
Energisystem Husbyggnad
Identifikatorer
URN: urn:nbn:se:liu:diva-118288DOI: 10.1016/j.apenergy.2012.10.019ISI: 000314669500053Scopus ID: 2-s2.0-84871715773OAI: oai:DiVA.org:liu-118288DiVA, id: diva2:813965
Tillgänglig från: 2014-11-09 Skapad: 2015-05-25 Senast uppdaterad: 2019-12-28Bibliografiskt granskad
Ingår i avhandling
1. Radiation properties of coil-coated steel in building envelope surfaces and the influence on building thermal performance
Öppna denna publikation i ny flik eller fönster >>Radiation properties of coil-coated steel in building envelope surfaces and the influence on building thermal performance
2015 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Recent studies have shown that the optical properties of building exterior surfaces are important in terms of energy use and thermal comfort. While the majority of the studies are related to exterior surfaces, the radiation properties of interior surfaces are less thoroughly investigated. Development in the coil-coating industries has now made it possible to allocate different optical properties for both exterior and interior surfaces of steel-clad buildings. The aim of this thesis is to investigate the influence of surface radiation properties with the focus on the thermal emittance of the interior surfaces, the modeling approaches and their consequences in the context of the building energy performance and indoor thermal environment.

The study consists of both numerical and experimental investigations. The experimental investigations include parallel field measurements on three similar test cabins with different interior and exterior surface radiation properties in Borlänge, Sweden, and two ice rink arenas with normal and low emissive ceiling in Luleå, Sweden. The numerical methods include comparative simulations by the use of dynamic heat flux models, Building Energy Simulation (BES), Computational Fluid Dynamics (CFD) and a coupled model for BES and CFD. Several parametric studies and thermal performance analyses were carried out in combination with the different numerical methods.

The parallel field measurements on the test cabins include the air, surface and radiation temperatures and energy use during passive and active (heating and cooling) measurements. Both measurement and comparative simulation results indicate an improvement in the indoor thermal environment when the interior surfaces have low emittance. In the ice rink arenas, surface and radiation temperature measurements indicate a considerable reduction in the ceiling-to-ice radiation by the use of low emittance surfaces, in agreement with a ceiling-toice radiation model using schematic dynamic heat flux calculations.

The measurements in the test cabins indicate that the use of low emittance surfaces can increase the vertical indoor air temperature gradients depending on the time of day and outdoor conditions. This is in agreement with the transient CFD simulations having the boundary condition assigned on the exterior surfaces. The sensitivity analyses have been performed under different outdoor conditions and surface thermal radiation properties. The spatially resolved simulations indicate an increase in the air and surface temperature gradients by the use of low emittance coatings. This can allow for lower air temperature at the occupied zone during the summer.

The combined effect of interior and exterior reflective coatings in terms of energy use has been investigated by the use of building energy simulation for different climates and internal heat loads. The results indicate possible energy savings by the smart choice of optical properties on interior and exterior surfaces of the building.

Overall, it is concluded that the interior reflective coatings can contribute to building energy savings and improvement of the indoor thermal environment. This can be numerically investigated by the choice of appropriate models with respect to the level of detail and computational load. This thesis includes comparative simulations at different levels of detail.

Ort, förlag, år, upplaga, sidor
Linköping: Linköping University Electronic Press, 2015. s. 94
Serie
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1677
Nationell ämneskategori
Energisystem Husbyggnad
Identifikatorer
urn:nbn:se:liu:diva-118291 (URN)10.3384/diss.diva-118291 (DOI)978-91-7519-047-1 (ISBN)
Disputation
2015-06-12, A35, Hus A, Campus Valla, Linköping, 10:15 (Engelska)
Opponent
Handledare
Tillgänglig från: 2015-05-25 Skapad: 2015-05-25 Senast uppdaterad: 2019-11-15Bibliografiskt granskad

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