Singapore Mean surface air temperature has risen by an average of 0.25°C per decade between 1948 and today. The upward trend is approximately double the trend in global temperatures, which occurred at a rate of 0.12°C per decade from 1951-2012.Meteorological Services Singapore
Many cities faced the challenge of trapped heat due to human activities such as the high usages of cars & air-conditioning; lower vegetation; presence of high rise building; construction material; water features or even building geometry. This trapped heat is known as urban heat island (UHI) is and studies has found out that it city temperature can be significantly warmer rural areas by as much as 7 Degree Celsius.
Though the air-conditioning industry has been advocating the use or energy efficient product, using solar panel to reduce energy usage or even using Artificial Intelligence to manage energy usage, none of these technologies are tapping on the potentials of abundance heat source in tropical countries or during summer days – when air conditioning is needed most.
For centuries, solar thermal technology has been used for heating water. Recently, much headway has been made with regard to the integration of solar thermal energy into the air conditioner refrigerant cycle.
By harnessing the ambient heat from the sun and the environment, the electricity needed for the superheating process of the refrigerant in vapour compression cycle of the system can be reduced by up to 55%. In addition, the heat dissipated to the environment by the air conditioner can be reduce by at least 4 degree celsius.
There are 1.37M Household in Singapore with around 75% with Air Conditioner installed or 1M Air Conditioners
With around 1 million air conditioners, the UHI reduction potential with solar thermal technology could be as much as “4 million degree celsius” – each air conditioner dissipates 4 degree celsius lesser heat to the environment.
A recent initiative by Cooling Singapore is to create a digital twin model of Singapore to study the factors affecting outdoor temperature.
Commenting on a “digital twin” of Singapore being built under the Cooling Singapore project to help researchers study factors affecting outdoor temperatures, SMU Associate Professor of Science, Technology and Society Winston Chow, a Cooling Singapore project principal investigator, said cooling strategies that can be implemented at new sites will differ from those in existing estates, which may need more retrofitting. “Some solutions that could work at existing estates could include, for example, having larger park spaces, green roofs and green walls, or having better technology, such as solar thermal hybrid air-conditioners, to reduce waste heat inputs into the urban climate,” said Assoc Prof Chow.
For more information, you may visit Ecoline Solar website.