Factors influencing the performance parameters of vacuum glazed smart windows to net zero energy buildings

Authors

  • Saim Memon Solar Thermal Vacuum Engineering Research Group, London Centre for Energy Engineering, School of Engineering, London South Bank University, London, United Kingdom
  • Yueping Fang Coventry University, School of Energy, Construction and Environment, Coventry, United Kingdom
  • Essam Mohamed Abo-Zahhad Mechanical Power Engineering Department, Faculty of Energy Engineering, Aswan University, Aswan, Egypt
  • O Abdelrehim Mechanical Power Engineering Department, Faculty of Engineering, Mansoura University, El Mansoura, Egypt
  • Mohamed R. Elmarghany Mansoura University Nanotechnology Center, Mansoura University, Mansoura, Egypt
  • Abdul Rashid Memon Department of Civil Engineering, Faculty of Engineering Science & Technology, Ziauddin University, Karachi, Pakistan
  • Shanwen Zhang College of Mechanical Engineering, Yangzhou University, Yangzhou, China
  • Amos Darko Department of Building and Real Estate (BRE), The Hong Kong Polytechnic University, Kowloon, Hong Kong.

DOI:

https://doi.org/10.37934/stve.2.1.118

Keywords:

Vacuum Glazing, Thermal Transmittance, Edge Seal, Getters, Evacuation Process

Abstract

The progression of smart technologies such as vacuum glazed windows are considered a realistic achievement of the net energy zero buildings (NZEBs). From designers to researchers to builders, there has been an increasing concern about understanding the inter-dependencies between the parameters and influencing factors that determine the performance of vacuum glazed smart windows. This research reviews the performance parameters such as thermal transmittance (U value), thermal resistance (R value), solar transmittance (g value), visible light transmittance (tv value) and  thermal resistance of residual gas space (Rgas value). These are inter-dependent on factors such as edge seal, support pillar array, low emittance coatings, getters, and effective evacuation process. This research implicates that effective hermetic edge seal provides longevity such as fusion and solder glass edge sealed vacuum glazing could be cost-effective and energy efficient solution. Stainless steel support pillar array is an unavoidable compromise on U value. This review shows that an increase of the size of glass sheet increases support pillar array improving the overall U value. Also, an addition of low emittance coatings enhances U value whilst maintaining tv value. To improve the overall life span of the vacuum glazed smart window, an incorporation of combo-getter that absorb any gases released from the internal glass surfaces in to into the vacuum cavity from the glass surface which prevents degradation of vacuum pressure and provide long term vacuum pressure stability in the vacuum glazed smart window. A recent improvement in the understanding of evacuation process shows that hot-plate surface heat induction of 60?C improved the vacuum pressure and mitigates the pump-out hole sealing process whilst lessening the temperature induced stresses.

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Published

2020-10-11

How to Cite

Memon, S., Fang, Y., Mohamed Abo-Zahhad, E., Abdelrehim, O., R. Elmarghany, M., Memon, A. R., Zhang, S., & Darko, A. (2020). Factors influencing the performance parameters of vacuum glazed smart windows to net zero energy buildings. International Journal of Solar Thermal Vacuum Engineering, 2(1), 1–18. https://doi.org/10.37934/stve.2.1.118
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Issue

Vol. 2 No. 1: September (2020)

Section

Research Articles
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