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How can I set plant availability according to outdoor air temperature? [closed]

asked 2016-01-27 15:29:26 -0500

Dustin gravatar image

updated 2016-01-28 04:16:14 -0500

I am trying to figure out if there is a way to have an availability schedule that runs off the outdoor air temperature. I have been notified that this plant that supplies a building I am modelling with chilled water is only operating when the outdoor air temperature is above 10C. I am wondering if anyone else knows of a way to model this so that it doesn't run when below 10C. They didn't specify if that was dry or wet bulb temperature but I can worry about that if this is even possible. The technician that gave me this information is reliable and the historical energy consumption data points towards the system being off during the winter months.

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Closed for the following reason question is not relevant or outdated by Dustin
close date 2017-01-12 12:44:57.370918

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answered 2016-01-27 17:09:25 -0500

updated 2016-01-28 01:41:13 -0500

Take a look at:

You may only need the low temperature turn off one, but I'd try it to make sure this is right.

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I have tried these but they seem to not be working properly. I am outputting the reference node temperature for the outdoor air temperature as well and the temperature doesn't go above 10C before the middle of May. Maybe I have input something wrong but I just input name, node, and temperature

Dustin gravatar image Dustin  ( 2016-01-28 08:57:15 -0500 )edit
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answered 2016-01-28 08:31:12 -0500

Archmage gravatar image

The key to getting the plant to shut down is going to be to get all the chilled water demand devices to turn off and not be requesting any chilled water. Assuming you want the air handlers to continue running for heating and ventilation, I would try to use SetpointManager:OutdoorAirReset to increase the cooling coil setpoint (on a system air node) to something really high when outdoor air gets to 10.0C.

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Asked: 2016-01-27 15:29:26 -0500

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Last updated: Jan 28 '16