### How to Manually Calculate Chiller Capacity for Your Process

Apr 04, 2019 Convert result into tons of chiller capacity. Divide Q (BTUs per hour) by 12,000 (the number of BTUs in one ton of cooling capacity). This yields the chiller capacity required to handle the process heat load in tons per hour: Example:20 tons/hr. Correct chiller tonnage for leaving water temp (LWT), if LWT is other than 50F:

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