[Equest-users] capacity check

[Charles Land]

Try Q=500*gpm*dT

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Verena Kindl
Sent: Friday, September 04, 2009 9:11 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] capacity check

Hi equester,

i was checking my results fort he chilled water loop. I entered a delta T of 11,8 F and a capacity of 21 MBTU/ h and in the PV-A report I find also 21 MBTU/h and a flow of  3556.5 gpm (593 lb/s). I checked the delta T using the formula Q=m*c*delta T
Delta T = Q/(m*c)
Delta T = 21*e6 Btu/h / (593 lb/s*3600s/h* 1 Btu/lbF ) = 9,8 F

The mass flow is too high and the delta T too low but i have not specified a massflow for the loop so it was up to equest sizing the massflow. Do you get appropriate massflows ? I tried it with other delta T but the temperature difference is always too low and the massflow to high. Sizing option is primary. Any idea? Have a nice weekend.

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