Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 31743
Investigating the Effectiveness of Self-Shading Strategy on Overall Thermal Transfer Value and Window Size in High Rise Buildings

Authors: Mansour Nikpour, Mohd Zin kandar, Mohammad Ghomeshi, Nima Moeinzadeh, Mohsen Ghasemi


So much energy is used in high rise buildings to fulfill the basic needs of users such as lighting and thermal comfort. Malaysia has hot and humid climate, buildings especially high rise buildings receive unnecessary solar radiation that cause more solar heat gain. Energy use specially electricity consumption in high rise buildings has increased. There have been growing concerns about energy consumption and its effect on environment. Building, energy and the environment are important issues that the designers should consider to them. Self protected form is one of possible ways against the impact of solar radiation in high rise buildings. The Energy performance of building envelopes was investigated in term of the Overall Thermal Transfer Value (OTTV ).In this paper, the amount of OTTV reduction was calculated through OTTV Equations to clear the effectiveness of self shading strategy on minimizing energy consumption for cooling interior spaces in high rise buildings which has considerable envelope areas against solar radiation. Also increasing the optimum window area was investigated using self-shading strategy in designing high rise buildings. As result, the significant reduction in OTTV was shown based on WWR.In addition slight increase was demonstrated in WWR that can influence on visible comfort interior spaces.

Keywords: Self-shading strategy, high rise buildings, Overall thermal transfer value (OTTV ), Window to wall ratio (WWR).

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 2554


[1] J.C. Lam et al, Residential building envelope heat gain and coolin, Energy, vol. 37, 2005, pp. 529-544.
[2] J.C. Lam, A survey of existing residential buildings and envelope designs in Hong Kong, Housing Science, vol 18, 1994.
[3] American Society of Heating Refrigerating and Air Conditioning Engineers. Energy conservation in new building design,ASHRAE Standard 90A-1980 Atlanta, GA: ASHRAE; 1980.
[4] D.H.W Li and J.C. Lam,Solar heat gain factors and the implications to building designs in subtropical region,Energ and Buildings, vol.32, 2000, pp 4755.
[5] D.H.W Li and J.C. Lam and S.L.Wong,Daylighting and its implications to overall thermal transfer value (OTTV) determinations , Energy, vol.27 , 2002, pp 991-1008.
[6] J.C. Lam and D.H.W Li and S.Cheung,An analysis of electricity end-use in air-conditioned office buildings in Hong Kong,Building and Environment, vol. 38, 2003, pp 493-498.
[7] Depatment of standard Malaysia, Code of parctice on energy efficciency and use of renewable energy for non-residential buildings(MS 1525:2007),FIRST REVISION, 2007.
[8] S. Chirartattananon,J. Nooritanon and R. Balaka, Day lighting for energy conservation in the tropics:the lumen method and the OTTV, Energy, vol.21, no. 6, 1996, pp 505-510.
[9] A.F. Tzikopopoulos and M.C Karatza and J.A. Paravanits. Modeling energy efficiency of bioclimaticbuildings,Energy and Buildings, vol. 37, 2005, pp.529-544.
[10] G. Capeluto,Energy performance of the self-shading building envelope, Energ and Buildings, vol.35, 2003, pp 327-336.
[11] C.S. Ling,Minimizing solar insolation on high rise building in Malaysia,2005.
[12] A.Z. Ahmed,Daylighting as a passive solar design strategy in tropical buildings: a case study of Malaysia,Energy Conversion and Management, vol. 43, 2002, pp 1725-1736.