Rabu, 22 Mei 2013

TEKNIK PERHITUNGAN SPACE COOLING LOAD DENGAN METODE TETD


Metode TETD
            Perhitungan heat gain pada ruang perkantoran menggunakan metode TETD. Secara ringkas cara perhitungan sebagai berikut:
  1.   Atap dan dinding (roofs and walls)
q = A x U x TETD
q = heat flow, Btu per hr
A = Area, ft2
U = Over-all heat transfer coefficient
TETD = Total equivalent temperature difference

     2.     Partisi, ceilling, dan lantai
q = A x U x TD
TD = (t2 – t1) = Difference in temperature between the bounding surface, F
     3.      Kaca
q = {A} x {[direct radiation] x [shade factor] + [convection] x [type factor]}
A =Area, ft2
     4.     Manusia (people)
qs  =  n x sensible heat gain
ql  =  n x latent heat gain
     qs  = q sensible
ql  = q latent
n   = Number of people in space
    5.      Penerangan
q = Watt x 3.4 x Allowance factor

    6.     Ventilasi dan infiltrasi
qs    =  1.08 x Q x (to - ti)
ql    =  0.7 x Q x (HRo - HRi)
Q    =  Air flow rate, cfm
to    =  Outside air temperatur
ti     =  Room air temperatur
    HRo =  Humadity ratio of outside air, grains per lb
    HRi  =  Humadity ratio of room air, grains per lb

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