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CI-2009 EAc1.3:Optimize Energy Performance—HVAC

Chilled water flow and pipe sizes

Hi All, I am here to post my query about chilled water system,flow and pipe sizes. As everybody know chilled water flow is 1.5 usgpm/tr when chiller is selected at delt T 16°F & 2.4 usgpm/tr when chiller is selected at delt T 10°F. But, what will be the problems if Chiller is selected/designed to produce delt T of 16°F and the chilled water flow rate & pipe size is designed at 2.4 usgpm/tr. Thanks......

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Bazeeth Ahamed K M
Conserve Green Building and MEP Solutions WLL
LEEDuser Basic Member
3 thumbs up

Wed, 10/26/2016 - 07:10

Hi You have selected the pipe for 2.4 gpm/TR where as the actual flowrate is 1.5 gpm/TR. So the velocity in the pipe will be lesser.Which means that you have over sized your pipes. It is a good idea to resize the pipe for actual flowrate to reduce the piping cost. If you prefer to keep the existing pipe sizes, You have ensure that the velocity is within in recommended limit.

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