Solution to Heat Island Effect

Do you know that the outside air in Singapore’s built-up areas is 7 degree Celsius hotter that the green areas? This phenomenon is called “Heat Island Effect”, where the air temperature at the city centre is higher than that of the surroundings non-urban areas.

As Singapore is rapidly urbanised over the last decades, coupled with climate changes, the built-up areas became hotter and we use more air-conditioning to cool ourselves. The hot air generated by the air-conditioning units contributes to the rising temperature in built-up areas This leads to a viscous cycle where the hotter it gets, the more air-conditioning we use, and the more air-conditioning we use, the even hotter it gets. Singapore has more installed air-conditioning units per capita than anywhere in Southeast Asia. The number of air-conditioning units is projected to grow by a staggering 73% between 2010 and 2030, where the built environment is projected to house a population to near 7 million over the next 12 years. The Heat Island Effect is anticipated to be a major environmental issue for Singapore in the foreseeable future.

The sun emits light in different spectra, one of which is IR (Infra-Red). IR absorb by various substrates including paints and caused them to heat up and emit heat to the environment.

In the paint industry what can we do to reduce the heat island effect?

TSR (Total Solar Reflectance) is used to measure the reflection ability of the pigments. The reading of TSR is between 0 to 100%. The higher the number of TSR the lower the heat absorption. Different colours have different TSR values. For dark colour, the TSR is 15 to 35%. White is 70-75%. The new technology has improved the TSR of white to 88%. Oxide black with TSR of 21% can be used to replace carbon black with TSR of 10%.

MAHA Chemicals provides a series of solar reflective colorants for paint makers. The solar reflective colorants, used in exterior paints, reduce the heat emission to the environment.

Do contact us to know more about solar reflective colorants.


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