Heat Flux through Naturally Ventilated Building in Malaysian Climate

Abstract:

Roofs and walls are the main media for heat transfer for typical Malaysian buildings. In order to estimate the duration of uncomfortable periods, the environmental temperature of a building was determined over a period of time. A study of heat flux through a naturally ventilated was conducted by simulation. This study focused on heat transfer through the roof, ceiling and vertical walls. A Thermal Analysis Software was used for the modeling and analyses. A virtual test building model dimension 4m x 4m x 3m was created using conventional construction parameters for roof, ceiling, windows, door, walls and floor which meet the minimum requirement in Malaysian Standards. The results show that heat rate flux mostly peak at east wall before 12:00 hrs and west wall after 12:00 hrs. The heat rate flux through the roof is higher than that through the ceiling during daytime but lower at night as roof was the surface of most exposed to solar radiation. The proportion of heat through roof was 87% by radiation, 11% by convection and 2% by conduction. 97% of heat was transferred by radiation and 3% by conduction for ceiling and heat through wall was 88% by radiation, 8% by convection and 4% by conduction respectively.

• Periodical: Applied Mechanics and Materials (Volumes 204-208)
• Pages: 4384-4388
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.204-208.4384
• Online since: October 2012
• Authors: Freda Morris, Nor Zaini Zakaria, Azni Zain Ahmed
• Keywords: Ceiling, Heat Rate Flux, Naturally Ventilated, Roof, Wall Orientation

References

[1] M. Caren, L. Roberto, G. Saulo, Evaluation of heat flux reduction provided by the use of radiant barriers in clay tile roofs. Energy and Buildings 40 (2008) 445–451, 2008.

DOI: 10.1016/j.enbuild.2007.03.013

[2] M. Frédéric, B. Harry, On the thermal behaviour of roof-mounted radiant barriers under tropical and humid climatic conditions: modelling and empirical validation. Energy and Buildings, 2003. 35(10): pp.997-1008.

DOI: 10.1016/s0378-7788(03)00035-5

[3] Vechaphutti, T, P.E., Simulation of Heat Gain through Building Envelope for Buildings in Hot Humid Climates., in http://www.ashraethailand.org/download/ashraethailand_org/pub_tawee.buildingenvelope.pdf, Member ASHRAE.

[4] T. Runsheng, I.A. Meir, W. Tong, Thermal performance of non air-conditioned buildings with vaulted roofs in comparison with flat roofs. Building and Environment 41 (2006) 268–276, 2006.

DOI: 10.1016/j.buildenv.2005.01.008

[5] M. Ozel, K. Pihtili, Investigation of the most suitable location of insulation applying on building roof from maximum load levelling point of view. Building and Environment 42 (2007) 2360–2368, 2007.

DOI: 10.1016/j.buildenv.2006.05.006

[6] Medina, A. Mario, On the performance of radiant barriers in combination with different attic insulation levels. Energy and Buildings, 2000. 33(1): pp.31-40.

DOI: 10.1016/s0378-7788(00)00065-7

[7] Zakaria N. Z., W. Peter, R. Ahmad, Thermal And Energy Evaluation Of Roof And Ceiling Insulation For Residential Building In Tropical Climate. in Proceeding of the 9th Senvar + 2nd ISESEE 2008. 2008. UiTM Shah Alam, Malaysia.

[8] Zain Ahmed A, A.A.M.S., P. N. Surendran, M. Y. H. Othman, Model year climate data for Klang Valley, Malaysia, Proceeding of Advances in Malaysian Energy Research (AMER 1998). Universiti Kebangsaan Malaysia, 26th Oct. pp.78-82.

DOI: 10.1016/s0960-1481(98)00200-6