Cooling Load Estimation for a Multi-story office building Thesis

eat Gain through Glass

Heat is transmitted through glass due to solar radiation. The heat gain through glass areas

constitutes a major portion of the load on the cooling apparatus. This could be direct in the form

of sunrays or diffused radiation due to reflection from other objects outside. Heat transmitted

through a glass depends on the wavelength of radiation and physical and chemical characteristics

of glass. Part of the radiation is absorbed, part is reflected and the rest is transmitted. The heat

transfer of glass takes place in the two ways, transmission heat gain and solar heat gain. The

following equations are used to calculate heat gain from glass areas.

Fig 3.4 heat gain through glass

Transmission heat gain through glass:

Q =UA(CLTD) corr …………... (3.4)

By solar radiation:

Q = A´SHGF ´SC´CLF max ………………….(3.5)

SHGF max = maximum solar heat gain factor (W/m2)

SC = shading coefficient depends on type of shading

CLF = cooling load factor

 

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