Current multi-pane windows have a very low heat loss but their solar transmittance is low resulting in a loss of daylight and solar gains. Multi-pane windows also require framing arrangements that are difficult to retrofit to existing apertures in many existing buildings. A contiguously sealed evacuated double-glazing with low long-wave radiative emittance coatings on its internal surfaces, no heavier than conventional double-glazing, with good visual transmittance suitable for retrofitting to existing buildings, has been analyzed experimentally. Measured heat transfer coefficients and visual transmittances of laboratory fabricated evacuated glazing samples, along with theoretical predictions of center of glazing thermal conductance are presented.

1.
Carmody
,
J.
,
Selkowitz
,
S.
, and
Heschong
,
L.
, 1996,
Residential Windows
Norton
,
New York
.
2.
Anonymous, 1989, “
Chapter 27 Fenestration
,”
ASHRAE Handbook, Fundamentals SI Edition
,
ASHRAE
,
Altanta
.
3.
Anonymous, 1986,
CIBSE Guide—Volume A: Design data
,
5th edition
,
CIBSE
,
London
.
4.
Collins
,
R. E.
, and
Robinson
,
S. J.
, 1991, “
Evacuated Glazing
,”
Sol. Energy
0038-092X,
47
(
1
), pp.
27
38
.
5.
Benson
,
D. K.
,
Smith
,
L. K.
,
Tracy
,
C. E.
,
Potter
,
T.
,
Christensen
,
C.
, and
Soule
,
D. E.
, 1990, “
Vacuum Window Glazings for Energy-Efficient Buildings
” Summary Report. Internal Report SERI/TP-212-3684,
Solar Energy Research Institute Golden
, Co.
6.
Collins
,
R. E.
, and
Simko
,
T. M.
, 1998, “
Current Status of the Science and Technology of Vacuum Glazing
,”
Sol. Energy
0038-092X,
62
(
3
), pp.
189
213
.
7.
Simko
,
T. M.
,
Elmahdy
,
A. H.
, and
Collins
,
R. E.
, 1999, “
Determination of the Overall Heat Transmission Co-Efficient (U-value) of Vacuum Glazing
,”
ASHRAE Trans.
0001-2505,
105
(
2
), pp.
891
899
.
8.
Griffiths
,
P. W.
,
di Leo
,
M.
,
Cartwright
,
P.
,
Eames
,
P. C.
,
Yianoulis
,
P.
,
Leftheriotis
,
G.
, and
Norton
,
B.
, 1998, “
Fabrication of Evacuated Glazing at Low Temperature
,”
Sol. Energy
0038-092X,
63
(
4
), pp.
243
249
.
9.
Hyde
,
T. J.
,
Griffiths
,
P. W.
,
Eames
,
P. C.
, and
Norton
,
B.
, 2000, “
Development of a Novel Low Temperature Edge Seal for Evacuated Glazing
,”
Proceedings of World Renewable Energy Congress VI
, Brighton UK,
A. A. M.
Sayigh
ed.,
Pergamon
,
Oxford
, Vol.
1
, pp.
271
274
.
10.
Arasteh
,
D.
,
Finlayson
,
E.
,
Rubin
,
M.
, and
Sadlier
,
J.
, 1995, “
Recent Technical Improvements to the WINDOW Computer Program
,” in
Proceedings of Windows Innovations ’95
,
Toronto, Ontario, Canada
, CANMET, Ottawa, pp.
400
405
.
11.
Eames
,
P. C.
, and
Norton
,
B.
, 1993, “
A Validated Unified Model for Optics and Heat Transfer in Line-axis Concentrating Solar Energy Collectors
,”
Sol. Energy
0038-092X,
50
(
4
), pp.
339
355
.
12.
Griffiths
,
P. W.
,
Norton
,
B.
,
Eames
,
P. C.
, and
Lo
,
S. N. G.
, 1996, “
Detailed Simulation of Heat Transfer Across Planar Evacuated Glazing
,”
Build. Res. Inf.
0961-3218,
24
(
3
), pp.
141
147
.
13.
Griffiths
,
P. W.
,
Eames
,
P. C.
, and
Norton
,
B.
, 1997, “
Thermal Properties of Evacuated Glazing Based on Experimental Solar Simulation and Computer Based Simulation Modelling
,” in
Proceedings of International Conference Building Envelope Systems Technology ’97
,
Bath UK
,
S.
Leadbetter
et al.
eds., pp.
343
348
.
14.
Anonymous, 1992, “
Low Emissivity Glasses for Improved Thermal Insulation
,” Pilkington Glass, St. Helens, Lancs., UK.
15.
Patankar
,
S. V.
, 1980,
Numerical Heat Transfer and Fluid Flow
,
Hemisphere
,
London
.
16.
Van der Vorst
,
H. A.
, 1992, “
Bi-CGstab-A Fast and Smoothly Converging Variant of Bi-CG for the Solution of Nonsymmetric Linear-Systems
,”
SIAM (Soc. Ind. Appl. Math.) J. Sci. Stat. Comput.
0196-5204,
13
(
2
), pp.
631
644
.
17.
Wilson
,
C. F.
,
Simko
,
T. M.
, and
Collins
,
R. E.
, 1998, “
Heat Conduction through the Support Pillars in Vacuum Glazing
,”
Sol. Energy
0038-092X,
63
(
6
), pp.
393
406
.
18.
Leftheriotis
,
G.
, and
Yianoulis
,
P.
, 1999, “
Characterisation and Stability of Low-Emittance Multiple Coatings for Glazing Applications
,”
Sol. Energy Mater. Sol. Cells
0927-0248,
58
(
2
), pp.
185
197
.
19.
Collins
,
R. E.
,
Poladian
,
L.
,
Pailthorpe
,
B. A.
, and
McPhedran
,
R. C.
, 1991, “
Heat Conduction through Support Pillars in Evacuated Glazing
,”
Aust. J. Phys.
0004-9506, Vol.
44
, pp.
74
86
.
20.
Griffiths
,
P. W.
,
Eames
,
P. C.
,
Hyde
,
T. J.
, and
Norton
,
B.
, 2000, “
A Low Temperature Sealed Vacuum Glazing System, Performance, Analysis and Predicted Economic and Environmental Benefits
,” in
Proceedings World Renewable Energy Congress VI
, Brighton UK,
A. A. M.
Sayigh
ed.,
Pergamon
,
Oxford
, Vol.
1
, pp.
207
212
.
You do not currently have access to this content.