Evaluation of the relationship between window's energy-saving efficiency and the emissivity through simulations

Energy crisis becomes a highly focused problem internationally. Window, as the most energy inefficient part in building envelope, has become the bottle neck for building energy efficiency improvement. The conventional approach to improve window energy efficiency is through chromogenic technique to r...

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Bibliographic Details
Main Author: Shi, Yan Wen
Other Authors: Long Yi
Format: Final Year Project (FYP)
Language:English
Published: Nanyang Technological University 2021
Subjects:
Online Access:https://hdl.handle.net/10356/147867
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author Shi, Yan Wen
author2 Long Yi
author_facet Long Yi
Shi, Yan Wen
author_sort Shi, Yan Wen
collection NTU
description Energy crisis becomes a highly focused problem internationally. Window, as the most energy inefficient part in building envelope, has become the bottle neck for building energy efficiency improvement. The conventional approach to improve window energy efficiency is through chromogenic technique to regulate solar transmissions. However, long-wave infrared (LWIR, 2.5 µm – 25 µm) emissivity, which relates to radiative cooling and warm keeping of window is seldom researched. In this report, the effect of front and back side emissivity in relation to window energy efficiency in different climate zones were systematically researched using energy simulation tool, EnergyPlus™. Cities in different zones include Singapore, Cairo, Shanghai, Madrid, Denver, and Moscow. Results showed that compared to the back side emissivity, front side emissivity plays a domination role on window energy saving across all climate zones. Low back side emissivity is preferred globally while the optimised front side emissivity depends on the season and region. Recommended front and back side emissivity values for different regions and seasons were summarised in this report. Suggestions for future study were also provided.
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spelling ntu-10356/1478672023-03-04T15:46:01Z Evaluation of the relationship between window's energy-saving efficiency and the emissivity through simulations Shi, Yan Wen Long Yi School of Materials Science and Engineering LongYi@ntu.edu.sg Engineering::Materials Energy crisis becomes a highly focused problem internationally. Window, as the most energy inefficient part in building envelope, has become the bottle neck for building energy efficiency improvement. The conventional approach to improve window energy efficiency is through chromogenic technique to regulate solar transmissions. However, long-wave infrared (LWIR, 2.5 µm – 25 µm) emissivity, which relates to radiative cooling and warm keeping of window is seldom researched. In this report, the effect of front and back side emissivity in relation to window energy efficiency in different climate zones were systematically researched using energy simulation tool, EnergyPlus™. Cities in different zones include Singapore, Cairo, Shanghai, Madrid, Denver, and Moscow. Results showed that compared to the back side emissivity, front side emissivity plays a domination role on window energy saving across all climate zones. Low back side emissivity is preferred globally while the optimised front side emissivity depends on the season and region. Recommended front and back side emissivity values for different regions and seasons were summarised in this report. Suggestions for future study were also provided. Bachelor of Engineering (Materials Engineering) 2021-04-19T06:04:33Z 2021-04-19T06:04:33Z 2021 Final Year Project (FYP) Shi, Y. W. (2021). Evaluation of the relationship between window's energy-saving efficiency and the emissivity through simulations. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/147867 https://hdl.handle.net/10356/147867 en application/pdf Nanyang Technological University
spellingShingle Engineering::Materials
Shi, Yan Wen
Evaluation of the relationship between window's energy-saving efficiency and the emissivity through simulations
title Evaluation of the relationship between window's energy-saving efficiency and the emissivity through simulations
title_full Evaluation of the relationship between window's energy-saving efficiency and the emissivity through simulations
title_fullStr Evaluation of the relationship between window's energy-saving efficiency and the emissivity through simulations
title_full_unstemmed Evaluation of the relationship between window's energy-saving efficiency and the emissivity through simulations
title_short Evaluation of the relationship between window's energy-saving efficiency and the emissivity through simulations
title_sort evaluation of the relationship between window s energy saving efficiency and the emissivity through simulations
topic Engineering::Materials
url https://hdl.handle.net/10356/147867
work_keys_str_mv AT shiyanwen evaluationoftherelationshipbetweenwindowsenergysavingefficiencyandtheemissivitythroughsimulations