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Effects of vertical greenery on mean radiant temperature in the tropical urban environment
Highlights Mean radiant temperature (t mrt) in front of 2 green walls was measured, showing reduction of t mrt for up to 1m. One green wall is removed midway during measurement, resulting in time lag and increase in t mrt of up to 12.8°C. GIS software used to generate t mrt map shows the extent of t mrt reduction due to green wall varies at different times of the day.
Abstract Studies on vertical greenery generally focus on the measurement of air temperature, surface temperature and cooling load. There is a lack of information on how vertical greenery can influence outdoor thermal comfort. The objective of this study is to quantify the effects of mean radiant temperature (t mrt), as the first step towards determining the thermal quality of outdoor space due to installation of vertical greenery. The t mrt of two green walls (Green Wall A and Green Wall B) was measured up to 2m away at intervals of 0.5m. Two datasets were obtained, one consisting of t mrt, surface and air temperature collected from the two green walls and the second for just green wall A and the exposed concrete wall after Green Wall B was removed. t mrt was measured using customised globe thermometers calibrated for local use. Data was analysed using a GIS, thus enabling convenient visual comparison between t mrt profiles at different times. The diurnal t mrt profile was altered significantly due to the installation of vertical greenery. When both green walls were present the peak t mrt occurred at 15:00h, but with more concrete exposed when one wall was removed, the peak occurred at 17:00h and was 10.9–12.9° higher at 0.5m away from the wall. Vertical greenery thus helped to reduce t mrt both during the day and at night, to varying extents. The proposed methodology enables systematic quantification of the effects of vertical greenery on t mrt.
Effects of vertical greenery on mean radiant temperature in the tropical urban environment
Highlights Mean radiant temperature (t mrt) in front of 2 green walls was measured, showing reduction of t mrt for up to 1m. One green wall is removed midway during measurement, resulting in time lag and increase in t mrt of up to 12.8°C. GIS software used to generate t mrt map shows the extent of t mrt reduction due to green wall varies at different times of the day.
Abstract Studies on vertical greenery generally focus on the measurement of air temperature, surface temperature and cooling load. There is a lack of information on how vertical greenery can influence outdoor thermal comfort. The objective of this study is to quantify the effects of mean radiant temperature (t mrt), as the first step towards determining the thermal quality of outdoor space due to installation of vertical greenery. The t mrt of two green walls (Green Wall A and Green Wall B) was measured up to 2m away at intervals of 0.5m. Two datasets were obtained, one consisting of t mrt, surface and air temperature collected from the two green walls and the second for just green wall A and the exposed concrete wall after Green Wall B was removed. t mrt was measured using customised globe thermometers calibrated for local use. Data was analysed using a GIS, thus enabling convenient visual comparison between t mrt profiles at different times. The diurnal t mrt profile was altered significantly due to the installation of vertical greenery. When both green walls were present the peak t mrt occurred at 15:00h, but with more concrete exposed when one wall was removed, the peak occurred at 17:00h and was 10.9–12.9° higher at 0.5m away from the wall. Vertical greenery thus helped to reduce t mrt both during the day and at night, to varying extents. The proposed methodology enables systematic quantification of the effects of vertical greenery on t mrt.
Effects of vertical greenery on mean radiant temperature in the tropical urban environment
Tan, Chun Liang (author) / Wong, Nyuk Hien (author) / Jusuf, Steve Kardinal (author)
Landscape and Urban Planning ; 127 ; 52-64
2014-04-05
13 pages
Article (Journal)
Electronic Resource
English
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