An Investigation of the Urban Heat Island of Singapore

  • YEAR
    Rajagopalan, Priyadarsini
    Wong, N.H
    2007 Conference Papers
    Effective environments: thermal, luminous, sonic, haptic, hygienic


Abstract: As a consequence of changes in the heat balance, air temperatures in densely built urban
areas are higher than the temperatures of the surrounding country. This phenomenon, known as Urban
Heat Island (UHI) contribute to the urban dweller’s summer discomfort and significantly higher air
conditioning loads. The effect of building is considered as one of the main reasons for urban heat
island effect. The heat that is absorbed during the day by the buildings, roads and other construction in
an urban area is re-emitted after sunset, creating high temperature differences between urban and
rural areas. This paper reports the extensive field measurements carried out to investigate the urban
heat island effect in Singapore. The occurrence and severity of Urban Heat Island effect in Singapore
was investigated by conducting simultaneous field measurements and the results showed that the high
density, high-rise commercial areas were having around 2°C higher temperature during the night. From
the results it was observed that the day time temperature was dominated more by the solar radiation
component rather than the reradiated temperature, which is the main cause of UHI. During the day, the
dense urban fabric provided solar shading within deep street canyons and the shaded area in between
tall buildings showed lower temperatures compared to areas with low-rise buildings.


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