PSIKOMETRIC

By : PT. Daikin Applied Solutions Indonesia

1. Mengatur Suhu udara2. Mengatur Sirkulasi Udara3. Mengatur Kelembaban (Humidity) udara4. Mengatur Kebersihan Udara

AIR CONDITIONER

NYAMAN ITU ADALAH SESUATU YANG TAK BERLEBIHAN ATAUPUN TAK KEKURANGAN

UDARA

PERUBAHAN WUJUD1. CAIRAN

- Menerima kalor Menguap (3) Evaporasi air mendidih- Melepas kalor Memadat (2) Solidifikasi air jadi es batu

2. PADATAN- Menerima Kalor Mencair (3) fusi es batu mencair- Menerima kalor Menguap (3) Sublimasi kamper

3. GAS

- Melepas Kalor Mencair (1) Kondensasi embun - Melepas Kalor mengkristal (2) Salju

LATENT OR SENSIBEL ?

Latent VS Sensibel

DryBlub

RelativeHumidity

DewPoint

100%Saturation

EnthalpyBTU / lb

WetBlub

Grains of Moisture

SpecificVolume

Breakdown of the Lines

UDARA

PROSES PSIKOMETRIC

1. AIR FLOW UDARA

2. ROOM DESIGN

3. ON COIL• Full fresh air• Mixing• Full Return air

4.OFF COIL

5.HEATER

AIR FLOW

• Volume Ruangan x air change– m3/h

• Area x Velocity– m3/s

• Fresh air / Return air / Mixing airkonversi

1 m3/h = 0.588578 CFM

1 m3/s = 2 118.88 CFM

1 CFM = 0.471947443 l/s

1 l/s = 2.11888 CFM

Air change

ROOM DESIGN

• STANDAR 24 - 26 TDB / 50% RH• Ruang OK 20 - 23 TDB / 50% RH

• Setelah tahu berapa room design check nilai Dew point nya• Dew Point menjadi Patokan untuk mencari nilai leaving air

On COIL

• Full Fresh Air 33 – 35 TDB / 60 - 80% RH• MiXing Air Return Air + Fresh Air• Return Air 27 TDB / 19 TWB

On COIL Off COIL

OFF COIL• Harus mengetahui nilai Room Design condition• Cari Nilai Dew Point untuk Room Design• Angka Minimal sama dengan dew point• Leaving lebih besar dari dew point hanya akan menghasilkan

pendinginan sensibel tidak akan terjadi kondensasi• Temp Lebih rendah lebih bagus lebih Ringan

Off Coil

Desain Airflow Ruangan

Air Flow = Room Vol. x ACH

= 124.43 m^3 x 30/hour

= 3733 m^3/hour

= 1045 lps

Desain Temperatur Ruangan

RA dbRA db = 20= 20 Cᵒ

RA RH= 50%RA RH= 50%

Outside Air Design

OA dbOA db = 34= 34

OA RH= 70%OA RH= 70%

RA dbRA db = 20= 20 Cᵒ

RA RH= 50%RA RH= 50%

LA Temperature

Tadp 8.8 CᵒSA db 9.2 CᵒSA wb 9.0 Cᵒ

OA dbOA db = 34= 34

OA RH= 70%OA RH= 70%

RA dbRA db = 20= 20 Cᵒ

RA RH= 50%RA RH= 50%

Coil Capacity

Tadp 8.8 CᵒSA db 9.2 CᵒSA wb 9.0 Cᵒ

OA dbOA db = 34= 34

OA RH= 70%OA RH= 70%

RA dbRA db = 20= 20 Cᵒ

RA RH= 50%RA RH= 50%

Cooling C

oil

Cooling C

oil

Late

nt H

eat

Late

nt H

eat

Sensible HeatSensible Heat

Coil Capacity

Sensible = 1.23 x AF x (Oadb – Ladb)

= 1.23 x 1045 lps x (34 C – 9.2 C)ᵒ ᵒ= 31. 9 kW

Latent = 3.01 x AF x (OaW – LaW)

= 3.01 x 1045 lps x (23.9 g/kg – 7.1 g/kg)

= 52.8 kW

Total = Sensible + Latent

= 31.9 kW + 52.8 kW

= 84.7 kW

Heater Capacity

Tadp 8.8 CᵒSA db 9.2 CᵒSA wb 9.0 Cᵒ

OA dbOA db = 34= 34

OA RH= 70%OA RH= 70%

RA dbRA db = 20= 20 Cᵒ

RA RH= 50%RA RH= 50%

Cooling C

oil

Cooling C

oil

SHR MaxSHR Max SHR MinSHR Min

1717 Cᵒ 9.29.2ᵒC

HeaterHeater

Heater Capacity

Heater = 1.23 x AF x (SA SHR 0.95 – SA SHR 0.85)

= 1.23 x 1045 lps x (17 C – 9.2 C)ᵒ ᵒ= 10 kW

Unit Selection

Cooling Cap. = 84.7 kW

Heating Cap. = 10 kW

Air Flow = 1045 lps

EA Coil = 34 C/29.14 Cᵒ ᵒLA Coil= 9.2 C/9 Cᵒ ᵒ

Thank You