Jumat, 17 April 2015

materi kuliah sains arsitektur minggu VII

PERHITUNGAN BEBAN PENDINGINAN

Estimation (Juwana, 2005)

No
Component
Formula
Annotation
1
Level of occupancy (occ)
Occ = Lbruto/Lper-person
You can also count by standard
Lbruto = total floor area
Lper-person = 15-20
2
Envelope / building sensible heat load (BSL)
BSL = Lsurface x HL
Lsurface = area of bldg element
HL = heat load of bldg component
3
Internal load:
Sensible and laten of the occupant (OSL, OLL)
Sensible heat load of lamps (LSL)
OSL = Occ x 200 BTUh
OLL = Occ x 250 BTUh
LSL = (Σ watt) x 1.25 x 3.4 BTUh

4
Infiltration load (CFM1)
CFM1 = (l xw x h x ACH x 35.31) / 60 BTUh

5
Ventilation load
CFM2 = (To-Ti) x1.08 + (RHo-RHi) x 0.67 BTUh
To = temp outdoor
Ti =indoor
Indonesian case, To-Ti=5oC
RHo = outdoor rel humidity
RH i = Indoor rel humidity
6
Cooling Load (CL)
CL = BSL + OSL + OLL + LSL + CFM1 + CFM 2

7
Cooling Capacity (TR)
TR = CL / 12000 BTUh


1TR (ton refrigeration) = 12.000 BTU

1 PK = 9.000 BTU


Cross Check

PK = (A x H)/100 x Koef TR x (12000/900)

Dimana:

PK           = Kebutuhan PK AC
A             = Luas Ruangan
H             = Tinggi Lantai ke Plafond
Koef TR  = 1



TUGAS:
*  Hitung beban pendinginan dan kebutuhan AC di studi kasus anda
*  Gambarkan juga peletakan indoor dan outdoor AC pada denah

Degan asumsi:
To - Ti = 5
Rho - Rhi = 15
Occupancy kelas = 40 orang
Occupancy lab = 15 orang
Occupancy ruang rapat = 20 orang

Tugas dikumpulkan pada saat UTS

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