Vertical Illuminance Measurement for Clear Skies in Tehran

نوع مقاله : مقاله پژوهشی


1 Assistant Professor, Department of Art and Architecture, Faculty of Arts and Architecture, Tarbiat Modares University, Tehran, Iran.

2 M.A. Student, Department of Art and Architecture, Faculty of Arts and Architecture, Tarbiat Modares University, Tehran, Iran.

3 Assistant Professor, Department of Architecture, Faculty of Architecture, Art University of Tehran, Tehran, Iran

عنوان مقاله [English]

Vertical Illuminance Measurement for Clear Skies in Tehran

نویسندگان [English]

  • Mohammadjavad Mahdavinejad 1
  • Soha Matoor 2
  • Rima Fayaz 3
چکیده [English]

To effectively design daylight in buildings, daylight availability data are necessary. Although there is a great potential for daylight energy in Iran, its use has been hampered by the absence of measured data. In this paper the illuminance data on the vertical south facing surfaces of Tehran were estimated using the IESNA model. For this propose an illuminance measuring set was used in order to measure the vertical illuminance for standard times over 17 days at one minute intervals from 9 a.m. to 4 p.m. Then, the measured data were compared with the IESNA model calculated data. A regression model between measured and calculated data was developed, which showed an acceptable linear correlation (r2=0.9535). Also mean hourly and monthly vertical illuminance was obtained from the new equation between measured and calculated data for a whole working year. To estimate daylight availability, Iso- Klx lines for working hours and frequency curves for vertical illuminance on south facing surfaces were produced.

کلیدواژه‌ها [English]

  • Daylight Availability
  • Vertical Iilluminance
  • Tehran
Alshaibani K. (2001). Potentiality of daylighting in a maritime desert climate: the Eastern coast of Saudi Arabia. Renewable energy, 23, 325-31.
Boyce. P, Hunter, C., Howlet, O. (2003) The Benefits of Daylight through Window, Lighting Research Center,Rensselaer Polytechnic Institute.
Kandilli, C., Ulgen, K. (2008). Solar Illumination and Estimating Daylight Availability of Global Solar
Irradiance, Energy Sources, part A, 30 (12), pp. 1127-1140.
Hasdemir, B. (1995). A new method for the estimation of lacking daylight illumination data byusing available
meteorological data. Ph.D. Thesis, Middle East Technical University, Ankara,Turkey.
Maccari, A., Zinzi, M. (2001). Simplified algorithms for the Italian energy rating scheme for fenestration in residential buildings. Solar Energy, 69, pp. 75-92.
Muneer, T., Abodahab, N., Weir, G., Kubie, J. (2000). Windows in Buildings: Thermal, Acoustical, Visual and
Solar Performance. Oxford: Architectural Press.
Paknejad, S., Ahmad Yazdi, A. (2009). Modification of Energy Consumption Patterns of Public or Government
Buildings. 7th National Conference on Energy. Tehran: Iran.
Robbins, C. L. (1986). Daylighting Design and Analysis. Van Nostrand Reinhold Company, New York.
Shekari, S., Golmohammadi, R., Mahjub, H., Mohammadfam, I. & Motamedzadeh, M. (2008). Estimation of illuminance on the South facing surfaces for clear skies in Iran. Journal of Research Health, 8, pp. 46-55.
Tahbaz, M., Jalilian, Sh. (2008). Architectural Design Principal Compatible with Climatic Conditions of Iran,Tehran: Beheshti University publication.