Performance Evaluations and Comparison of Selected Addis Ababa Sub-city Administration Buildings in Terms of Thermal Comfort

Samuel Getachew Bulti^1, and Nebyou Yonas Gabore²

¹Department of Architecture, Addis Ababa Science and Technology University, Addis Ababa, Ethiopia

²Chair of Urban Design, Ethiopian institute of Architecture, Building Construction and City Development, Addis Ababa University, Addis Ababa, Ethiopia

Cite this paper:
Samuel Getachew Bulti and Nebyou Yonas Gabore. Performance Evaluations and Comparison of Selected Addis Ababa Sub-city Administration Buildings in Terms of Thermal Comfort. American Journal of Civil Engineering and Architecture. 2020; 8(2):44-51. doi: 10.12691/ajcea-8-2-3

Abstract

The office building thermal comfort is very important for occupant performance. This study investigates the thermal comfort performance of the naturally ventilated buildings of five selected Addis Ababa sub-city administration offices in different orientations. The objective of the study is to evaluate and compare the office building thermal performance in different orientations with the same thermal insulation materials. This research study is based on building users survey, field measurements, and secondary data review and analysis. The field study and survey were carried in the warmest month of the city May 2019 for a selected room of the case buildings. The field study and survey assessed the indoor air temperatures and relative humidity levels of selected five office building rooms, as the occupants completed questionnaires covering their thermal sensations and thermal preferences. The data obtained from the survey was analysed by SPSS and excel software and secondary data was analysed in a practical part through measurement from survey data collection. Results of field studies have shown that most of the occupants prefer a cooler environment and found their thermal environment not comfortable. The indoor temperature fluctuation of the buildings and the humidity level are within the allowable limits. But, sometimes the temperature levels overpass the acceptable range. The result also revealed that there is a difference in thermal performance between the buildings in different orientations. At the time of measurements building ‘III’ oriented towards North West perform better to occupants thermal environment compared to other buildings. Consequently, to improve the internal environment, additional appropriate passive design strategies are recommended.

Keywords:
thermal performance thermal comfort natural ventilation passive design

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References:

[1]	Nikolopoulou, C. & Azar, E. (2015). An occupancy-driven framework to optimize energy consumption and human comfort in a group of buildings: Proceedings of BS2015: 14th Conference of International Building Performance Simulation Association, Hyderabad India, (December), 7-9.
[2]	Ibrahim S.H., Baharun A., Nawi M.N.M & Junaidi E. (2014). Assessment of thermal comfort in the mosque in Sarawak, Malaysia. International Journal of Energy and Environmental.
[3]	Liping, W., & Hien, W. N. (2006). The impact of façade designs: orientations, window to wall ratios and shading devices on indoor environment for naturally ventilated residential buildings in Singapore. PLEA2006 The 23rd Conference on Passive and Low Energy Architecture, Geneva Switzerland, (September), 6–8.
[4]	Albatayneh, A., Alterman, D., Page, A., & Moghtaderi, B. (2018). The significance of the orientation on the overall buildings thermal performance- case study Australia. Energy procedia 152 (2018) 372-377.
[5]	Al-Obaidi, M. A. and Woods, P. (2006). Investigations on effect of the orientation on thermal comfort in terraced housing in Malaysia. International journal of low-carbon technologies.
[6]	Lechner, N. (2015). Heating, cooling, lighting: sustainable methods for architects. Fourth edition. Wiley & Sons, Inc., Hoboken, New Jersey.
[7]	Le Hong. M.D & Rodriques, L. (2013). Visual and Thermal Performance in Façade Design. PLEA2013 - 29th Conference, Sustainable Architecture for a Renewable Future, Munich, Germany 10-12 September 2013
[8]	ASHRAE. (2017). ANSI/ASHRAE/IES Standard 90.1–2010 energy standard for buildings except low-rise residential buildings. Atlanta, GA: American Society of Heating, Refrigerating, and Air-Conditioning Engineers.
[9]	ISO 7730. (2005). Ergonomics of the thermal environment — Analytical determination and interpretation of thermal comfort using calculation of the PMV and PPD indices and local thermal comfort criteria. 3rd edition. Geneva, Switzerland. International Organisation for Standardization; 2005.
[10]	Andrade, S. (2015). Thermal performance of naturally ventilated office buildings with double skin façade under Brazilian climate conditions. University of Brighton, Brazil
[11]	Fanger, P.O. (1973). Thermal Comfort. McGraw-Hill Book Company, New York
[12]	Santamouris, M. (2008). Advances in building energy research. volume 2. Earthscan. London, UK
[13]	Mustafa F.A. (2017). Performance assessment of buildings via post-occupancy evaluation: A case study of the building of the architecture and software engineering departments in Salahaddin University-Erbil, Iraq. Frontiers of Architectural Research (2017) 6, 412-429.