More specifically:

- How to calculate the pump's head?
- How to calculate the pump's flow?

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**Head:**

ht = Total pump’s head (ft)

hf = Friction loss in developed length of longest pipe run in system per 4’/100’ friction loss (ft)

*Developed length is total length of supply and return including equivalent length for fittings (rule of thumb: 3 times of supply pipe)

hch = Pressure loss in chiller’s condenser

hct = Pressure loss in cooling tower

**Flow:**

Q = Total chiller’s load (Btuh)

500 = Factor for converting lb of water to gpm – Btuh

∆T = The temperature difference between condenser water supply and return (℉)

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