Primary stage of solar energy use in architecture-Shadow control

Abstract

In architecture and urban design, solar energy plays an important role to save fossil energy and preserve environment. Passive or active use of this energy needs especial consideration in the preliminary stage of design to the probable shadows. This work will answer two questions: 1) How is it possible to distinguish shadow need periods during a year in a specific climate? 2) How is it possible to produce shadow in hot periods without being deprived of pleasant sunshine in cold periods? In this regard, it will introduce the usage process and opportunities of “shading mask” of Olgyay as an easy and useful graphical method in six steps. At the end, different ways of using this method in design will be discussed. Several research projects that have been done in past 30 years will support the argument as examples of this method.

Keywords

shading mask / sun-path chart / shadow angle protractor / thermal comfort / climatic needs calendar

References

[1] PleijelG.The computation of natural radiation in architecture and town planning [M], 1954, Stockholm, Victor Peterson’s bokindustri Aktiebolag: 110-125

[2] OlgyayA., OlgyayV.Solar control and shading devices [M], 1957, Princeton, Princeton University Press

[3] HopkinsonR. G. P., PetherbridgeL. J.Daylighting [M], 1956, London, Heinemann: 47

[4] TahbazM.. Architecture of shadow [C]. Living in Desert, 2006, Algeria, Ghardaia: 45-54

[5] MooreF.Concepts and practice of architectural daylighting [M], 1991, New York, Van Nostrand Reinhold

[6] Meteorology weather data [EB/OL]. NOAA Weather and climate data (USA): www.lib.ncsu.edu/gis/noaaclim.html; The National Climatic Data Center: http://www.ncdc.noaa.gov/oa/mpp/freedata.html; Canada’s National Climate Archive: http://climate.weatheroffice.gc.ca/prods_servs/index_e.html; Met Office: http://www.metoffice.gov.uk/climate/uk/datasets/; EnergyPlus Energy Simulation Software: http://apps1.eere.energy.gov/buildings/energyplus/cfm/weather_data.cfm; GRIB.US: http://www.grib.us/; Royal Netherlands Meteorological Institute: http://www.grib.us/.

[7] GivoniB.Man, climate and architecture, 19812nd Edition [M]London, Applied Science Publishers Ltd: 314-319

[8] GivoniB.Climate consideration in building and urban design [M], 1998, New York, Van Nostrand Reinhold: 36-45

[9] BRÖDE P, JENDRITZKY G, FIALA D, HAVENITH G. The universal thermal climate index UTCI in operational Use [C]// NCEUB 3rd International Conference: Adapting to Change: New Thinking on Comfort. Cumberland Lodge, Windsor Great Park, UK, 2010: 1–6.

[10] TahbazM.AMINI BEHBAHANI P. SIKRON 3.1.0 [Z], 2011, Tehran, Shahid Beheshti University

[11] TahbazM.. Toward a new chart for outdoor thermal analysis [C]. Nceub 3rd International Conference: Adapting to Change: New Thinking on Comfort, 2010, Windsor Great Park, UK, Cumberland Lodge

[12] OlgyayV.Design with climate [M], 1973, Princeton, New Jersey, Princeton University Press: 26-31

[13] Meteorology Organization of Iran. www.irimo.ir.

[14] TahbazM.. Psychrometric chart as a basis for outdoor thermal analysis [J]. International Journal of Engineering and Urban Planning, 2011, 21(2): 95-109

[15] TahbazM., DjalilianS.The principles of climatic housing design in Gorgan and Gonbad cities in north of Iran (moderate and humid climate) [R], 2007, Gorgan, Housing Foundation of Islamic Revolution of Iran-Golestan Province

[16] TahbazM.Environmental control in building [M], 2012, Tehran, Fatemi Press