Why do I have no heat energy and very high fan energy

asked 2018-02-02 20:15:31 -0500

RBallard gravatar image

I have 3 story office building with a separate roof top package -- DX cooling and hot water heat from DES system --in each office space. My cooling loads are reasonable, but I have no heat and very high fan loads. Obviously, the fans are providing all the heat. No DES heat is used except for SHW. I have checked the fan air volumes, and they are reasonable. I have set all fans to draw .9watt/cfm of air. I do not see the problem.

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Do your fans run continuously 24/7?

rraustad gravatar image rraustad  ( 2018-02-02 20:36:32 -0500 )edit

No. And that would not explain the absence of any heat at all. The calculated heat load is also higher than the calculated fan power for the specified air flow. Its almost as if the DES heat energy is being reported as part of the fan energy.

RBallard gravatar image RBallard  ( 2018-02-02 23:21:32 -0500 )edit

what's the climate?

Joe Huang gravatar image Joe Huang  ( 2018-02-03 02:41:05 -0500 )edit

Victoria, Canada, ASHRAE 4C

RBallard gravatar image RBallard  ( 2018-02-03 12:31:48 -0500 )edit

Are your rooms all meeting the setpoint? It's possible your fans aren't providing the heat, and instead you just aren't heating.

bbrannon4 gravatar image bbrannon4  ( 2018-02-05 17:45:05 -0500 )edit