One quick method to calculate a BTU Load is:
Flow Rate X Temperature Drop X 500.
For example if you have 50 GPM flow from your chiller system, leaving at 25 F and returning at 27 F, the Heat Load can be calculated as:
50 GPM X 2 F TD (27 F - 25 F) X 500 = 50,000 BTU/HR
In regards to Glycol Flow you need to remember it will be rare that all of your vessels will be "calling" for cooling simultaneously, although the 50 GPM is possible and is your Maximum Flow- it's probably more realistic your Design Flow will be about 50% of the Maximum Flow.
I ran your load data and came up with a Brewery Cooling load of less than 15,000 BTU/HR- I think a system rated at 27,000 BTU/HR @ 28 F Glycol and 90 F Ambient would service this load without problem.
Hope this helps, Good Luck.
Jim VanderGiessen Jr.
CEO, Pro Refrigeration, Inc
253-735-9466 Ext 203
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