Abstract
Energy consumption in building sector in Pakistan is almost 30 % [1] of its total energy use and it is increasing
with annual growth rate of 4.7 % and 2.5 % in domestic and commercial sector respectively. Currently there is
severe energy crises in Pakistan and this has adversely effected economical growth of the country. The
geographical orientation of Pakistan (latitude between 24N - 35N) explains that the country remains in sunny and
hot climate throughout the year. Utilization of modern energy efficient materials in existing building envelopes
can help in reduction of building energy demands. In this study research effort focuses on identification of energy
consumption pattern for an existing building (Lahore based) in its current and retrofitted form. A computer
program (Hourly Analysis Program HAP) has been used to simulate actual operating conditions, existing cooling
load of the building was estimated and possible retrofitting measures were tested in terms of their energy saving
potential. Important parameters like window size, double glazing, windows orientation, and building envelop
orientation, space between window frames, window frame materials, and use of shade on windows, are considered
as key decision variables, these are simulated to study their effect on building energy demands. Results presented
in this study suggests that significant energy saving can be obtained with slight modification in the existing
building. In this study 28.6 % energy was saved by applying different retrofitting techniques.
Tauseef Aized, Sajid Mehmood, Zahid Anwar. (2017) Building Energy Consumption Analysis, Energy Saving Measurements and Verification by Applying HAP Software, Pakistan Journal of Engineering and Applied Sciences, VOLUME 21, Issue 1.
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