11

HIBAH PENGEMBANGAN COURSE CONTENT HIBAH PENGEMBANGAN COURSE CONTENT BERBASIS WEB & MULTIMEDIABERBASIS WEB & MULTIMEDIA

PROGRAM HIBAH KOMPETISI K 1 INHERENT UNIVERSITAS GADJAH MADA 2006

Mechanical Engineering DepartmentMechanical Engineering DepartmentFaculty of EngineeringFaculty of Engineering

Gadjah Mada UniversityGadjah Mada University2006/20072006/2007

22

Topics :Topics :

• 1. AC Principle1. AC Principle• 2. Human being 2. Human being

thermodynamicthermodynamic• 3. Cooling Load3. Cooling Load• 4. Psychrometric 4. Psychrometric • 5. Type of AC5. Type of AC• 6. Air Handling Unit 6. Air Handling Unit

(AHU)(AHU)• 7. Fan Cooling Unit 7. Fan Cooling Unit

(FCU)(FCU)• 8. Trouble Shooting8. Trouble Shooting

33

AC PrincipleAC Principle• AC controls airAC controls air : :

– TemperatureTemperature– RH %RH %– QualityQuality– Air CirculationAir Circulation– NoiseNoise

• Refrigeration Refrigeration ApplicationApplication– Cold storageCold storage– Room ACRoom AC– Textile IndustryTextile Industry– Ice Cream FactoryIce Cream Factory– Electronic Electronic

ManufactoryManufactory– Mall, High Rise Mall, High Rise

Building etcBuilding etc

44

Air Composition :Air Composition :

• Atmosphere Air Atmosphere Air StandardStandard– G = 9,807 m/sG = 9,807 m/s22

– T = 15 T = 15 CC– P = 1 atm = 14,7 psi P = 1 atm = 14,7 psi

= 101,325 kPa= 101,325 kPa– P v = R TP v = R T– = 1,225 kg/m= 1,225 kg/m33

– R = 287 J/kgKR = 287 J/kgK

Dry Air :O2 = 20,95%N2 = 78,09%CO2= 0,03%Ar = 0,93%BM =28,965

Moisture(H2O)BM=18

55

Sifat-sifat udaraSifat-sifat udara

• Tekanan, P = PTekanan, P = Paa + P + Pvv

• Kelembaban spesifikKelembaban spesifik

• Kelembaban relatifKelembaban relatif

• Tingkat kejenuhanTingkat kejenuhan

• Volume spesifik, vVolume spesifik, v

•Temperatur bola Temperatur bola kering, Tkering, Tdbdb

•Temperatur bola Temperatur bola basah, Tbasah, Twbwb

•Temperatur jenuh, TTemperatur jenuh, Tdpdp

•Enthalpi, hEnthalpi, h

a

v

a

v

P

P622,0

m

m

s

a

P,Ts

v

P,Ts

v

P

P

622,0P

PRH

P,Ts

va hhh

dbdb T86,13,2501Th

66

Psychrometric ChartPsychrometric Chart

RH (%)

Tdp

77

SKALA SHF

Tdb=24 oC

RH =50%

88

Thermodynamic process

012

3

4 5

6

7

8

Proses :0-1 = Sensible heating0-2 = Sensible cooling0-3 = Humidification0-4 = Dehumidification0-5 = Heating & Dehumidification0-6 = Heating & Humidification0-7 = Cooling & Humidification0-8 = Cooling & Dehumidification

99

Human Being Human Being ThermodynamicThermodynamic

Hm = 100%

UDARA(0,5 m3/jam)

Ha = 2%

HL = 80%

W = 20%

Hc = 25%HR = 43%

He = 30%

SENSIBEL

LATEN

Hm – W = He + Hc + HR

Heat reject man = 105 – 117 Watt/man

1010

Cassette Type Indoor UnitCassette Type Indoor Unit

1111

Ceiling Type Indoor UnitCeiling Type Indoor Unit

1212

Packaged ACPackaged AC

1313

Meeting RoomMeeting Room

1414

Wall Mounted Indoor Wall Mounted Indoor UnitUnit

1515

Energy SourceEnergy Source

• Internal :Internal :– PenghuniPenghuni– LampuLampu– Peralatan listrikPeralatan listrik

• Eksternal :Eksternal :– InfiltrasiInfiltrasi– Radiasi suryaRadiasi surya– Konduksi, konveksiKonduksi, konveksi

• VentilasiVentilasi

• Fan, ductingFan, ducting

Lampu

Peralatan listrik

Penghuni

Infiltrasi

Konduksi

1TR = 12 000 Btu/hr = 3,5 kW = 3000 kcal/hr

1616

Pengelompokan beban Pengelompokan beban pendinginanpendinginan

TR, RH%

RSH,RLH,RTH

ERSH, ERLH, ERTH

AHUSA DA MA

OA

EA

RA

RA

BABF

OASH,OALHOATH

TSH,TLH,GTH

ERSH = RSH + BF.OASHERLH = RLH + BF. OALHERTH + ERSH + ERLH

TSH = RSH + OASHTLH = RLH + OALHGTH = TSH +TLH

GTH

TSHGSHF

ERTH

ERSHERSHF

RTH

RSHRSHF

1717

CARA MENGGAMBAR GARIS SHF

R(24oC,60%)

Misal RSHF = 0,75

1818

R

M

STadp

GSHF

RSHF

ERSHF

Proses pengkondisian udara

O

TSATR

1919

Kebutuhan udara suplaiKebutuhan udara suplai

• Satuan BritishSatuan British• CFMCFMsasa

• Satuan SISatuan SI• CMMCMMSASA

SAR

SAR

saR

hh02,0

RTH

68,0

RLH

TT1,1

RSH

SAR

SAR

saR

hh02,0

RTH

50

RLH

TT0204,0

RSH

RSH,RLH, RTH (Btu/hr)T (F), ( grain/lb)CFM (ft3/min)

RSH,RLH, RTH (kW)T (F), ( gram/kg)CMM (m3/min) = 35 CFM

2020

adpRDA TTBF11,1

ERSHCFM

BFBF AplikasiAplikasi ContohContoh0.3 – 0.50.3 – 0.5 Beban kecilBeban kecil RecidenceRecidence

0.2 – 0.30.2 – 0.3 Beban besarBeban besar

SHF kecilSHF kecilRecidence, Recidence, Retail shop, Retail shop, factoryfactory

0.1 – 0.20.1 – 0.2 KenyamananKenyamanan Dept. Store, Dept. Store, Bank, factoryBank, factory

0.05 – 0.10.05 – 0.1 Beban besarBeban besar

Beban laten besarBeban laten besarDept. Store, Dept. Store, RestaurantRestaurant

0.0 – 0.10.0 – 0.1 All Outdoor SystemsAll Outdoor Systems Hospital, Hospital, Operation Operation RoomRoom

2121

Tabel Bypass FactorTabel Bypass Factor

Pipe/rowPipe/row3 Fin/cm3 Fin/cm 6 Fin/cm6 Fin/cm

Air Velocity (m/min)Air Velocity (m/min)

9090 210210 9090 210210

22 0.420.42 0.550.55 0.220.22 0.380.38

33 0.270.27 0.400.40 0.100.10 0.230.23

44 0.190.19 0.300.30 0.050.05 0.140.14

55 0.120.12 0.230.23 0.020.02 0.090.09

66 0.080.08 0.180.18 0.010.01 0.060.06

88 0.030.03 0.080.08

2222

Thank YouThank You

• To be continueTo be continue