A properly sized chiller will properly cool process equipment. Here is an equation to calculate the load requirements:
BTU = Constant x GPM x Temperature Differential
|500||constant (weight of water)|
|x 10||GPM (gallons per minute)|
|x 12||degrees Temperature Differential (or rise)|
|60,000||Required BTUs per hour|
In the above example, the process equipment, being cooled 12 degrees by pure water at 10 GPM, would require a 5 ton chiller since 12,000 BTUs = 1 ton of cooling.