Experimental and Numerical Investigation of Received ‎Solar Radiation on a Domed and Flat Roof

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Abstract

Domed roofs are the masterwork of mechanical engineering because of building heat load reduction in Iran. Received ‎solar radiation on a domed and flat roof has been compared with each other experimentally and numerically in this ‎research. Data measurements have been done on 15th day of each month from sunrise to sunset with one hour intervals. ‎A 1/10 scaled model of a mosque in Yazd has been used for experimental investigation. Data obtained on 13 point on ‎this model. The dome has three circuits named A, B and C, with a horizontal angle of 30o, 50o and 90o respectively. ‎Four points on every circuit in the four main directions are considered. Results show that the total received solar ‎radiation (per unite area of dome base) for flat roof is higher than domed roof. The maximum solar radiation received ‎on the East and South direction for warm and cold seasons respectively for domed roof. The minimum solar radiation ‎received on the North direction during a year. The maximum solar radiation on the East direction is received in the ‎early morning, while the West has its maximum in the late afternoon. In addition the maximum received solar ‎radiation for the flat roof and the South direction of the dome occur at approximately noon, while the maximum ‎received solar radiation tends to be happened before noon for the North direction.‎

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References

 
]1[ دهقانی ع.ر.، مزیدی م. (1379)، تعیین جریان کلی هوا در بادگیرها به عنوان عاملهای تهویه مطبوع سنتی در ساختمانهای قدیمی، نامه مکانیک شریف، سال 3، شماره 8.
[2] Faghih Khorasani A.R., Bahadori N. M. (2011). “Thermal performance evaluation of domed roofs”. Energy and Buildings, Vol. 43, pp. 1254-1263.
]3[ سرپوشان، س.، یعقوبی، م.، (1381)، محاسبه انرژی خورشیدی روی سطوح سه بعدی، نشریه انرژی ایران، شماره 13.
[4] Tang R., Meir I.A., Etzion Y. (2003). “Thermal behavior of buildings with curved roofs as compared with flat roofs”. Solar Energy, Vol. 74, pp. 273-286.
[5] Tang R., Meir I.A., Wu T. (2006). “Thermal performance of non air-conditioned building with vaulted roofs in comparison with flat roofs”. Building and Environment, Vol. 41, pp. 268-276.
[6] Gomez V., Porta M., Heard C. (2003). “Solar performance of hemispherical vault roofs”. Building and Environment, Vol. 38, pp. 1431-1438.
[7] Kelin S.A. (1977). ”Calculation of monthly average insulation on tilted surfaces”. Solar Energy, Vol. 19, pp. 325-329.
[8] Liu B.Y.H., Jordan R.C. (1960). “The interrelationship and characteristic distribution of direct, diffuse and total solar radiation”. Solar Energy, Vol. 4, pp. 1-19.
[9] Collares Perreira M., Rabl A. (1979). “The average distribution of solar radiation - correlations between diffuse and hemispherical and between daily and hourly insulation values”. Solar Energy, Vol. 22, pp. 155-164.
[10] Faghih Khorasani A.R., Bahadori N. M. (2009). “Solar radiation on domed roofs”. Energy and Buildings, Vol. 41, pp. 1238-1245.
[11] Duffie J.A., Beckman W.A. (2006), “Solar Engineering of Thermal Processes”. John Willy, NY.
]12[ بهادری نژاد، م.، میرحسینی، س.ع.، (1381)، ضریب صافی هوا برای شهرهای مختلف ایران، سومین همایش بهینه سازی مصرف سوخت در ساختمان، 26 تا 27 بهمن.
 
 
Journal of Modeling in Engineering
Volume 13, Issue 43
January 2016
Pages 15-24

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History

  • Receive Date: 28 January 2017
  • Revise Date: 16 September 2017
  • Accept Date: 28 January 2017

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