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Plant Loop:Demand Side is storing excess heat the majority of the time

asked 2018-09-23 23:00:04 -0500

Siv gravatar image

updated 2018-09-27 23:10:48 -0500

How to rectify the error "Plant Loop:Demand Side is storing excess heat the majority of the time" ?

PLANT LOOP SETTING image description

PUMP SETTING image description

LOOP image description

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Can you describe your plant loop a bit? Is your pump set a "Continuous" or "Intermittent"?

Julien Marrec gravatar image Julien Marrec  ( 2018-09-24 09:10:08 -0500 )edit

My pump is continuous, I have included images of the pump settings and the loop settings

Siv gravatar image Siv  ( 2018-09-26 22:46:26 -0500 )edit

Can you post a picture of the plant loop itself, so we can see what's on the supply and demand side? Have you tried setting the pump to "Intermittent"?

Julien Marrec gravatar image Julien Marrec  ( 2018-09-27 05:13:50 -0500 )edit

I have posted the picture on top and yeah I have tried using intermittent pump setting also.

Siv gravatar image Siv  ( 2018-09-27 23:09:28 -0500 )edit

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answered 2018-09-28 04:03:41 -0500

Siv gravatar image

I have resolved the error by setting the Reference Temperature Type = OutdoorAirDryBulb in the Setpoint manager FollowOutdoorAirTemperature. Previously it was OutdoorAirWetBulb.

What I do not understand is the physics involved in this. Could you please explain this phenomenon ?

I have attached a picture of the updated loop. image description

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It should work properly with OutdoorAirWetBulb, but the temperature inputs need to match your cooling tower design. Offset Temperature difference should be roughly the same as your cooling tower approach, maximum setpoint temperature should be near the CT's EWT at design conditions,e tc

Julien Marrec gravatar image Julien Marrec  ( 2018-10-02 02:27:44 -0500 )edit

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Asked: 2018-09-23 23:00:04 -0500

Seen: 499 times

Last updated: Sep 28 '18