Increased solar energy and daylight utilisation using anti-reflective coatings in energy-efficient windows
(2005) In Solar Energy Materials and Solar Cells 89(2-3). p.249-260- Abstract
- Glass with low-a coatings based on SnO2 (usually referred to as hard coatings) provides a cost-effective replacement of one of the panes in ordinary double-pane windows. It considerably improves the energy efficiency of the window and at the same time preserves the appearance of,old hand-crafted windows. Adding a low refractive index anti-reflective (AR) coating on both sides of the low-a coated pane in such a double-glazed window makes it possible to achieve high light and solar transmittance, while the U-value remains unaffected. In this study the influence on the daylight factor, solar factor and annual heating demand when AR-coated low-a glass is used instead of normal low-a glass and ordinary clear glass has been investigated for a... (More)
- Glass with low-a coatings based on SnO2 (usually referred to as hard coatings) provides a cost-effective replacement of one of the panes in ordinary double-pane windows. It considerably improves the energy efficiency of the window and at the same time preserves the appearance of,old hand-crafted windows. Adding a low refractive index anti-reflective (AR) coating on both sides of the low-a coated pane in such a double-glazed window makes it possible to achieve high light and solar transmittance, while the U-value remains unaffected. In this study the influence on the daylight factor, solar factor and annual heating demand when AR-coated low-a glass is used instead of normal low-a glass and ordinary clear glass has been investigated for a typical multi-family dwelling in Scandinavia using energy and daylight simulation. For a double-glazed window with one low-a hard coating, light transmittance was found to increase by as much as 15 percentage points, from 74 to 89% transmittance, if both panes were AR-treated, while the emissivity of the low-a coated pane was virtually unaffected. Compared to clear double glazing, the visual transmittance was increased by 7 percentage points. The simulations show that the monthly average solar factor (g-value) increased by 7 percentage points compared to the low-a double-glazed window without AR-coatings. The annual heating demand decreased by 4% due to the higher solar transmittance of the window. The AR-coating increased the daylight factor by 21% according to the simulation. The study has shown that the main benefit of using AR coatings in a low-a window is the improvement of visual transmittance and the resulting increase in the daylight factor. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/220521
- author
- Rosencrantz, Tobias LU ; Bülow-Hübe, Helena LU ; Karlsson, Björn LU and Roos, A
- organization
- publishing date
- 2005
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- energy simulations, anti-reflective coatings, low-a coatings, energy-efficient windows, daylighting
- in
- Solar Energy Materials and Solar Cells
- volume
- 89
- issue
- 2-3
- pages
- 249 - 260
- publisher
- Elsevier
- external identifiers
-
- wos:000232363100014
- scopus:24944468768
- ISSN
- 0927-0248
- DOI
- 10.1016/j.solmat.2004.12.007
- language
- English
- LU publication?
- yes
- id
- ba62a4d2-ab58-4bf5-9713-0847456e2d98 (old id 220521)
- date added to LUP
- 2016-04-01 17:11:24
- date last changed
- 2022-02-05 21:24:16
@article{ba62a4d2-ab58-4bf5-9713-0847456e2d98,
abstract = {{Glass with low-a coatings based on SnO2 (usually referred to as hard coatings) provides a cost-effective replacement of one of the panes in ordinary double-pane windows. It considerably improves the energy efficiency of the window and at the same time preserves the appearance of,old hand-crafted windows. Adding a low refractive index anti-reflective (AR) coating on both sides of the low-a coated pane in such a double-glazed window makes it possible to achieve high light and solar transmittance, while the U-value remains unaffected. In this study the influence on the daylight factor, solar factor and annual heating demand when AR-coated low-a glass is used instead of normal low-a glass and ordinary clear glass has been investigated for a typical multi-family dwelling in Scandinavia using energy and daylight simulation. For a double-glazed window with one low-a hard coating, light transmittance was found to increase by as much as 15 percentage points, from 74 to 89% transmittance, if both panes were AR-treated, while the emissivity of the low-a coated pane was virtually unaffected. Compared to clear double glazing, the visual transmittance was increased by 7 percentage points. The simulations show that the monthly average solar factor (g-value) increased by 7 percentage points compared to the low-a double-glazed window without AR-coatings. The annual heating demand decreased by 4% due to the higher solar transmittance of the window. The AR-coating increased the daylight factor by 21% according to the simulation. The study has shown that the main benefit of using AR coatings in a low-a window is the improvement of visual transmittance and the resulting increase in the daylight factor.}},
author = {{Rosencrantz, Tobias and Bülow-Hübe, Helena and Karlsson, Björn and Roos, A}},
issn = {{0927-0248}},
keywords = {{energy simulations; anti-reflective coatings; low-a coatings; energy-efficient windows; daylighting}},
language = {{eng}},
number = {{2-3}},
pages = {{249--260}},
publisher = {{Elsevier}},
series = {{Solar Energy Materials and Solar Cells}},
title = {{Increased solar energy and daylight utilisation using anti-reflective coatings in energy-efficient windows}},
url = {{http://dx.doi.org/10.1016/j.solmat.2004.12.007}},
doi = {{10.1016/j.solmat.2004.12.007}},
volume = {{89}},
year = {{2005}},
}