The thermal performances of vacuum glazings employing coatings with emittance between 0.02 and 0.16 were simulated using a three-dimensional finite volume model. Physical samples of vacuum glazings with hard and soft coatings with emittance of 0.04, 0.12 and 0.16 were fabricated and their thermal performance characterised experimentally using a guarded hot box calorimeter. Good agreement was found between experimental and theoretical thermal performances for both a vacuum glazing with a soft coating (emittance 0.04) and those with hard coatings (emittance 0.12 and 0.16). Simulations showed that for a low value of emittance (e.g. 0.02), the use of two low-emittance coatings gives limited improvement in thermal performance of the glazing system. The use of a single high performance low-emittance coating in a vacuum glazing has been shown to provide excellent performance.
- Vacuum glazing
- Low-emittance coating
- Thermal performance
Fang, Y., Eames, P., Norton, B., Hyde, T., Zhao, J., Wang, J., & Huang, Y. (2007). Low emittance coatings and the thermal performance of vacuum glazing. Solar Energy, 81(1), 8-12. https://doi.org/10.1016/j.solener.2006.06.011