The study of thermal transfer value for medium scale mixed development in Singapore / Jeffrey Ng
Energy usage for building is very significant and has been on the climb from year to year especially with the growing number of buildings to cope with the development and ever growing population. With the usage of air conditioning in most buildings nowadays contributing up to 40% of total buildin...
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| Summary: | Energy usage for building is very significant and has been on the climb from
year to year especially with the growing number of buildings to cope with the
development and ever growing population. With the usage of air conditioning in most
buildings nowadays contributing up to 40% of total building energy use in most
countries, it is becoming worrying and measure need to be taken to tackle this effect. In
Singapore, studies have shown the total energy use for cooling for a building range from
45.1% up to 73% of the total building energy usage which is even more alarming. Thus
Envelope Thermal Transfer Value (ETTV) was introduced as a tool to regulate and
measure the building heat gain.
This dissertation proposes a methodology to utilize and generate the relationship
between ETTV and Total Cooling Energy (Ec) consumption using a case study. Using a
medium scale mixed development building in Singapore as case study; the ETTV value
& its corresponding Ec is calculated and stimulated using Carrier’s E-20 program
respectively. It was found that the ETTV value for the variation of glass used range
from 39.89 W/m2 to 55.81 W/m2 with translates to 4.73% reduction in ETTV value for
each 0.1 SC-Value drop for Window to Wall Ratio (WWR) of only 0.29. It was also
found that each W/m2 of ETTV value increases the Ec by 0.65 kW with the selected air
conditioning system with COP of 3. Although the findings are specific to the case study
building, it is significant as medium scale mixed developments is the most sought after
and constructed buildings in Singapore. Nevertheless with the findings, proper measures
to set and review the permissible ETTV value range to ensure the energy usage of
building can be managed more efficiently. |
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