How to Size a Chiller

15 Jul.,2024

 

How to Size a Chiller

Labs, Plastics, Lasers, Semiconductor, Medical, Pharmaceutical, Extraction, Chemical, the list could go on and on.  What all of these industries have in common is they all require a chiller at some point in the process.  Determining the size of the chiller required is as simple as following a formula.  As long as you have a few facts, it may be done without being an expert.  However, if you&#;re unsure, please do not be afraid to contact us, we&#;d love to assist you.

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How to Size a Chiller

There is a single and easy to follow formula for determining the size of chiller you require. However, there are a few factors you must know before you begin:

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  • The incoming water temperature
  • The water temperature you require
  • The flow rate

General sizing formula:

  1. Calculate Temperature Differential (ΔT°F) ΔT°F = Incoming Water Temperature (°F) &#; Required Chill Water Temperature
  2. Calculate BTU/hr. BTU/hr. = Gallons per hr x 8.33 x ΔT°F
  3. Calculate tons of cooling capacity Tons = BTU/hr. ÷ 12,000
  4. Oversize the chiller by 20% Ideal Size in Tons = Tons x 1.2
  5. You have the ideal size for your needs

For example, what size chiller is required to cool 10 GPM from 72°F to 58°F?

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  1. ΔT°F = 72°F &#; 58°F = 14°F
  2. BTU/hr. = 10 gpm x 60 x 8.33 x 14°F = 69,972 BTU/hr.
  3. Ton Capacity = 69,972 BTU/hr. ÷ 12,000 = 5.831 Tons
  4. Oversize the chiller = 5.831 x 1.2 = 6.
  5. A 6. or 7-Ton chiller is required