heating and cooling load

ahmad hussen

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إنضم
1 ديسمبر 2011
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principle of heat transfer:-
1- the heat can not be destroyed but it is transfer from substance to athor one
2- the heat transfer from high tempreture to low

method of heat transfer :-
1- conduction :- in the solid substance
2- convection :- in the fluid substance
3- radiation :- by the sunlight

there are tow type of heat :-
1- sensible heat it is change in the dry bulb
2- latent heat is change in the moisture content

notation evry one person can released the heat to the inviromantal by (convection or radiation ) about to (132-450)watt

the factors effect of the comfort :
1- dry bulb 2- humidity 3- noise 4- velocity of air

the component of the cooling load :-
1- conduction of the (wall-window-roof...)
Q=UxAx(Tout-Tin)
U=1/Rtot
2- solar radiation through the window :-
Q=SCxSCLxA
SC & SCL from the tabel of the ashrea
3- people :-
Q=#of people x heating of each one
heating of each one from table
4- lighting :-
Q= watt/area x area
watt/area from table of each one
5- equipment :-
Q=watt/area x area
watt/area from tabel
6- infilltration :-
Qsen= 1210x air flow x (Tout-Tin)
air flow = (volume x air change)/3600
air change from table
Qlat= 3010x air flow x (Wout-Win)
W humdity ratio
7- ventelation :-
Qsen= 1210x air flow x (Tout-Tin)
air flow from ashrea Qlat= 3010x air flow x (Wout-Win)
W humdity ratio
 

akram77

عضو جديد
إنضم
28 يونيو 2009
المشاركات
28
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