| Author: | Lam, Tang Ho Gabriel |
| Title: | Difference between daylight factor and climate-based measures for high-rise residential buildings in Hong Kong |
| Advisors: | Wei, Tommy (BSE) |
| Degree: | M.Eng. |
| Year: | 2017 |
| Subject: | Hong Kong Polytechnic University -- Dissertations Daylight -- Measurement Daylighting High-rise apartment buildings -- China -- Hong Kong |
| Department: | Department of Building Services Engineering |
| Pages: | viii, 68 pages : color illustrations |
| Language: | English |
| Abstract: | This dissertation has aimed to illustrate the shortcomings of daylight factor (DF) by comparing the results with climate-based daylight modelling (CBDM) for high-rise residential building in Hong Kong. Static and dynamic daylight metrics were performed for evaluating the visual and non-visual daylight performance in high-rise residential buildings. The simulation results were collected to provide recommendations for the evaluation parameters which are suitable to be used in high-rise residential building in Hong Kong and to enhance the daylight performance of the specific high-rise residential building in Hong Kong by optimising the building orientation. The comparison between static and dynamic daylight metrics was made. Dynamic daylight metrics apparently were the metrics which are better than static daylight metric. The dynamic metric may give a more realistic and extensive result about indoor daylight performance. Among those dynamic daylight metrics, useful daylight illuminance (UDI), spatial daylight autonomy (sDA) and annual sunlight exposure (ASE) are recommended to assess daylight because of their overall ability. Optimising building orientation was another focus area, the orientation angle of 45° is recommended for concord-1-block. The assessment on circadian lighting was performed by computer simulation. The ratio of circadian-lux to photopic-lux was acted as an indicator to show the relationship of circadian-illuminance and photopic-illuminance. Based on the simulation of March 21st, it seems that time, flats elevation or orientation of window has nearly no impact on the ratio of circadian-lux to photopic-lux. For the June 21st simulation, it might be concluded that circadian-illuminance is sensitive to correlated colour temperature (CCT) value. 21st of March, June, September and December are selected to perform circadian daylight simulation because of the long daylight length. Average circadian-lux of these four days are used to illustrate the circadian performance of a year. From the simulation results, this might reflect that the circadian lighting performance is affected by flats elevation, the amount of direct skylight and CCT. Flats on the lowest floor were under the condition of an inadequate amount of circadian lighting, which needed to be compensated with lighting fixtures. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 991021959949303411.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 2.43 MB | Adobe PDF | View/Open |
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