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AHU water side cooling load calculation

by Dasa . 08 Dec 2020
Enter real values to get proper results:
Chilled water Btu:
Chilled water Tons:

The simple formula which is used to calculate chilled water Btu is

Btu/hr = 500 * gpm * Δ\DeltaT

Where,
gpm - Water flow rate measured in gpm (gallons per minute)
Δ\DeltaT - Chilled water Temperature difference between inlet and outlet in °F

The above equation is derived from

Q = mCpC_{p}Δ\DeltaT

Where,
Q - Total enthalpy
m - Mass flow rate
CpC_{p} - Specific heat of water
Δ\DeltaT - Chilled water Temperature difference between inlet and outlet

We want to get the total enthalpy in Btu/hr by entering the water flow rate in gpm. To achieve that we need the vairables in below specified unit of measurements

mass flow rate in lb/gallons-hr,
Specific heat in Btu / lb-°F,
Temperature difference in °F

  • Mass flow rate of water = mass/volume
  • 1 gallon of water = 8.33 lb
  • 1 gpm = 60 gallons/hour
  • Specific heat of water = 1.0 Btu/lb−oFBtu/lb-^{o}F

Substitute the above values and we get

Q = (8.33 lb * gpm * 60) * 1.0 * Δ\DeltaT
= 499.8 * gpm * Δ\DeltaT
≈\thickapprox 500 * gpm * Δ\DeltaT


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