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HVAC Coil Design & Operating Data

The document provides specifications for a coil-fin heat exchanger, including tube dimensions, fin properties, and operating data. The heat exchanger is designed to provide a total cooling load of 60 kW at full load, with 20 kW devoted to latent cooling. Air enters at 26°C dry bulb and 19°C wet bulb temperatures, with a face velocity of 2.8 m/s. Chilled water enters at 6°C and exits at 11°C, with a mass flow rate of 2.9 kg/s. Psychrometric data is also provided for the inlet air conditions.

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Ranu Januar
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378 views4 pages

HVAC Coil Design & Operating Data

The document provides specifications for a coil-fin heat exchanger, including tube dimensions, fin properties, and operating data. The heat exchanger is designed to provide a total cooling load of 60 kW at full load, with 20 kW devoted to latent cooling. Air enters at 26°C dry bulb and 19°C wet bulb temperatures, with a face velocity of 2.8 m/s. Chilled water enters at 6°C and exits at 11°C, with a mass flow rate of 2.9 kg/s. Psychrometric data is also provided for the inlet air conditions.

Uploaded by

Ranu Januar
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLSX, PDF, TXT or read online on Scribd
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1 Coil construction parameters

Outside tube diameter do 13.41 mm


Inside tube diameter di 12.09 mm
Longitudinal tube spacing SL 26.16 mm
Transverse tube spacing ST 31.75 mm
No. of fins/m Nf 554
Aluminum fin thickness tf 0.15 mm
Exchanger compactness β 1060 m2/m3
Outside area/inside area (Ao/Ai) 23
Aflow/Aface on the air-side σ 0.529
Finned-surface weighted efficiency ηS 0.85
Number of tube-passes per water loop Np 6

2 Design operating Data


Moist air
Total cooling load at full load Qc 60 kW
Latent Load at full load QL 20 kW
Inlet air conditions t Dry tdry 26 oC
Inlet air conditions t Wet twet 19 oC
Air face velocity Vface 2.8 m/s
Air heat transfer coefficient hc 60 W/(m2oC)
Air mean specific heat cpm 1.001 kJ/(kg.K)

3 Chiller Water
Inlet Water Temperature TWin 6 oC
Water mass flowrate mW 2.9 kg/s
Water inlet velocity VW 1.25 m/s
Heat Transfer coefficient on water side hi 4000 W/(m2oC)
Number off tube passes per water loop Ntp 6
Exit water temperature TWout 11 oC
Water specific heat CPW 4.14 kJ/(kg.K)

4 Psychorometric Chart Air In


Inlet air conditions t Dry tdry 26 oC
Inlet air conditions t Wet twet 19 oC
RH 50 %
Entalphi hain 54 kJ/kg
Moisture Content Wain 0.011 kgv/kga
Dew Point dpt 15.5 oC
CSHF 0.75
Moisture Air In Φ 95 %

5 Psychorometric Chart Air In


Inlet air conditions t Dry tdry 26 oC
Inlet air conditions t Wet twet 19 oC
RH 50 %
Entalphi hain 54 kJ/kg
Moisture Content Wain 0.011 kgv/kga
Dew Point dpt 15.5 oC
CSHF
Moisture Air In Φ 95 %
Design operating Data
Moist air
Total cooling load at full load Qc 60 kW
Latent Load at full load QL 20 kW
Inlet air conditions t Dry tdry 26 oC
Inlet air conditions t Wet twet 19 oC
Air face velocity Vface 2.8 m/s
Air heat transfer coefficient hc 60 W/(m2oC)
Air mean specific heat cpm 1.001 kJ/(kg.K)

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