Nomenclature</h5> a radius of support pillar (m)</P>h surface heat transfer coefficient (W m −2 K −1 )</P>k thermal conductivity (W m −1 K −1 )</P>p pillar separation (m)</P>R thermal resistance (m −2 K −1 W −1 )</P>t thickness of glass pane (m)</P>T temperature (°C)</P>U thermal transmission (W m −2 K −1 )</P>Greek letters</h5> ɛ hemispheric emittance of a surface</P>σ Stefan–Boltzmann constant (5.67 × 10 −8 W m −2 K −4 )</P>Δ mean surface temperature difference between glass panes I, II, III.</P>Subscripts</h5> 1 to 6 refer to surfaces of glass panes shown in Fig. 1 </P>I, II, III refer to the first, second and third glass panes</P>i,o refer to warm and cold ambient temperatures</P>g glass</P>m glass pane number of the TVG</P>n vacuum gap number</P>p pillar</P>r radiation</P>tot total resistance of triple vacuum glazing</P>1 Introduction</h5> The concept of vacuum glazing was first patented by Zoller  . Since the publishing of the patent nearly 90 years ago, there have been many further patents on vacuum glazing [2,3] . However the first fabricated vacuum glazing was reported by a team at the University of Sydney in 1989 which used a solder glass with a melting point of 450 °C to seal the
Energy and Buildings – Elsevier
Published: Jun 15, 2015
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