We cannot overstate the importance of selecting a correctly sized chiller. Undersized chillers won’t correctly cool your process equipment or materials. Oversized chillers will work just fine, but why pay more than you need to? When you select a chiller of the proper size, you can rely on several years of efficient cooling. Use the formula below to determine the chiller size that will most optimally meet your needs.
Regardless of what you are cooling, this formula will determine your needed chiller size. Before jumping in, identify the following variables:
Step One: Calculate Temperature Differential (ΔT°F)ΔT°F = Incoming Water Temperature (°F) – Required Chilled Water Temperature.
Example: ΔT°F = 85°F – 75°F = 10°F
Step Two: Calculate BTU/hr.BTU/hr. = Gallons per hr x 8.33 x ΔT°F
Example: (4 gpm x 60) x 8.33 x 10°F = 19,992 BTU/hr
Step Three: Calculate tons of cooling capacityTons = BTU/hr. ÷ 12,000
Example: 19,992 BTU/hr. ÷ 12,000 = 1.666 tons
Step Four: Oversize the chiller by 20%Ideal Size in Tons = Tons x 1.2
Example: 1.666 x 1.2 = 1.9992
Most likely, your “Ideal Size in Tons” is not going to come out to an even 1 ton, 5 tons, 20 tons, etc. Round up to determine which chiller size you will need. In this example, our final answer is 1.9992, which means we will need a 2-ton chiller.
We hope this was helpful! Of course, if you have any questions or would like us to size your chiller for you, please give us a call at (866) 826-2993.