Solar thermal performance of two innovative configurations of airvacuumlayered triple glazed windows

Journal article

Yueping, F., Memon, S., Jingqing, P., Mark, T. and Tingzhen, M. (2019). Solar thermal performance of two innovative configurations of airvacuumlayered triple glazed windows. Renewable Energy. 150, pp. 167-175. https://doi.org/10.1016/j.renene.2019.12.115
AuthorsYueping, F., Memon, S., Jingqing, P., Mark, T. and Tingzhen, M.
Abstract

This study reports the optimal solar thermal performance of two innovative configurations of air-vacuum layered triple glazed window or Integrated Vacuum Window (IVW). These are when the vacuum layer of
IVW is facing the warm or indoor side, i.e. IVWwarm, and when the vacuum layer of IVW is facing the cold or outdoor side, i.e. IVWcold, positions at dynamic solar insolation under winter and summer EN-ISO
standard ambient conditions. A theoretically and experimentally validated finite element model is employed. The results show that in winter conditions, although the U-value of IVWwarm of 0.33 Wm-2K-1 is lower than that of IVWcold of 0.49 Wm-2K-1, the IVWcold has a higher solar heat gain. In sunny winter conditions, IVWcold provides higher energy efficiency while in winter night, IVWwarm provides higher energy efficiency than IVWcold. The results show that in summer conditions the U-value of IVWwarm and IVWcold are 0.34 Wm-2K-1 and 0.51 Wm-2K-1 respectively, while IVWwarm provides lower cooling-load and higher energy-efficiency compared to IVWcold. It is concluded that setting the
vacuum gap at the indoor side position provides lower cooling-load and higher energy-efficiency compared to setting the vacuum cavity at the outdoor side position in summer ambient conditions.

KeywordsVacuum; Window; Solar insolation; Thermal performance; Low emittance coatings
Year2019
JournalRenewable Energy
Journal citation150, pp. 167-175
PublisherElsevier
ISSN0960-1481
Digital Object Identifier (DOI)https://doi.org/10.1016/j.renene.2019.12.115
Web address (URL)https://www.sciencedirect.com/science/article/pii/S0960148119319871?via%3Dihub
Publication dates
PrintMay 2019
Online27 Dec 2019
Publication process dates
Accepted24 Dec 2019
Deposited21 Jan 2020
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