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Numerical and experimental investigation of the influence of infrared reflective interior surfaces on building temperature distributions
Linköping University, Department of Management and Engineering, Energy Systems. Linköping University, Faculty of Science & Engineering. Energy Technology, Dalarna University, Falun, Sweden; SSAB Europe, Borlänge, Sweden.
Building, Energy & Environmental Engineering, University of Gävle, Gävle, Sweden .
Energy Technology, Dalarna University, Falun, Sweden; SSAB Europe, Borlänge, Sweden.
Energy Technology, Dalarna University, Falun, Sweden .
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2015 (English)In: Indoor + Built Environment, ISSN 1420-326X, E-ISSN 1423-0070, 1-13 p.Article in journal (Refereed) Epub ahead of print
Abstract [en]

Radiative properties of interior surfaces can affect not only the building heat flux but also the indoor environment, the latter of which has not been thoroughly investigated. The aim of this study is to analyse the effect of surface emissivity on indoor air and surface temperature distributions in a test cabin with reflective interior surfaces. This was done by comparing experimental and simulation data of the test cabin with that of a normal cabin. This study employs transient computational fluid dynamics (CFD) using re-normalisation group (RNG) kε model, surface-to-surface radiation model and an enhanced wall function. Boundary conditions were assigned to exterior surfaces under variable outdoor conditions. The numerical and the measurement results indicate that using interior reflective surfaces will affect the indoor air temperature distribution by increasing the vertical temperature gradient depending on the time of the day. CFD simulations with high spatial resolution results show increased interior surface temperature gradients consistent with the increased vertical air temperature gradient. The influence of reflective surfaces is potentially greater with higher indoor surface temperature asymmetry. The vertical indoor air temperature gradient and surface temperatures are important parameters for indoor thermal comfort.

Place, publisher, year, edition, pages
Sage Publications, 2015. 1-13 p.
Keyword [en]
Reflective interior surfaces, indoor air temperature gradient, Transient computational fluid dynamics, surface-to-surface radiation, building thermal performance
National Category
Energy Systems Building Technologies
Identifiers
URN: urn:nbn:se:liu:diva-118289DOI: 10.1177/1420326X15609966OAI: oai:DiVA.org:liu-118289DiVA: diva2:813974
Note

Funding agencies|SSAB Europe; Dalarna University; University of Gävle; Linköping University.

At the time for thesis presentation publication was in status: Manuscript

Available from: 2015-05-25 Created: 2015-05-25 Last updated: 2016-08-04Bibliographically approved
In thesis
1. Radiation properties of coil-coated steel in building envelope surfaces and the influence on building thermal performance
Open this publication in new window or tab >>Radiation properties of coil-coated steel in building envelope surfaces and the influence on building thermal performance
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
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.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2015. 94 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1677
National Category
Energy Systems Building Technologies
Identifiers
urn:nbn:se:liu:diva-118291 (URN)10.3384/diss.diva-118291 (DOI)978-91-7519-047-1 (print) (ISBN)
Public defence
2015-06-12, A35, Hus A, Campus Valla, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2015-05-25 Created: 2015-05-25 Last updated: 2015-05-26Bibliographically approved

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