Ushani Kumari

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Name with Initials:
E. A. U. C. E.Kumari
Year of Admission to the Program:
2009
Topic of the Dissertation:

Analysis of building envelops to optimize energy efficiency as per code of practice for energy efficient buildings in Sri Lanka 2008

Abstract of the Dissertation:

Residential and commercial buildings consume approximately 20% of the global energy generation. This
value is continuously growing and the governments across the globe have realized the importance of
regulating the building construction to optimize the energy utilization. Energy efficient building codes
have been developed to optimize the energy efficiency in buildings. OTTV (Overall Thermal Transfer
Value) is a key parameter for evaluating energy efficiency of building envelops in the present building code
of Sri Lanka. In this research, the prescriptive requirements mentioned in the building code for the
building envelops to optimize the energy efficiency of five (05) commercial buildings has been analyzed.
The indoor climate was modeled and the annual cooling energy variation with Overall Thermal Transfer
Value was studied using “DesignBuilder” software. A cost benefit analysis was carried out for enhanced
energy efficiency building envelops applications. It was attempted to develop a general relationship
between the OTTV and annual cooling energy requirement for each building. It has been observed that a
second order polynomial relationship with R2 of 0.861 exists for RDA building, linear relationship with R2
of 0.838 exists for AirMech building. However a specific relationship could not be observed for BMICH,
SLSI and WTC buildings. The impact on cooling energy requirement from envelop parameter
modification is unique for each building. In some instances the reduction of OTTV has not resulted in
any reduction of the cooling energy requirement. There is a combined effect from each building
component which affects the final cooling energy requirement. A simulation based technique to be used
to find the optimum building envelops design.