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Modeling Warehouse With Only Fans

asked 2018-02-16 09:32:59 -0600

pksmith gravatar image

updated 2018-02-18 10:47:20 -0600

Hello, I am new to openstudio/energy plus. I am working on modeling a warehouse that is one large thermal zone, with the only HVAC equipment being fans, both supply and exhaust. Is there a way to accomplish this?

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answered 2018-02-17 11:46:39 -0600

Avi gravatar image

updated 2018-02-19 03:24:41 -0600

That shouldn't be too hard: Go to the HVAC systems tab and add new Air Loop by clicking the green plus sign in the upper left. Now you can select the Warm Air Furnace template by clicking Add to Model.

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Go on and delete the Furnace and the Setpoint manager (in blue). Click on My Model tab in the upper right and from the Thermal Zone menu drag the one zone you should have, to the node left of the Duct in the Demand Equipment part. For now, your air loop should look something like that:

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From the Library tab you can select Setpoint Manager Schedule to control the Air Flow. Select the Scheduled Deck Temp and drag it to the last node in the Supply Equipment side (were the blue SM was)

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Now click on the SM and change the Control Variable to MassFlowRate and add a schedule that describe how the mass flow should change during the year.

You can also change the name of the air loop along with other controls by clicking the doted line in the middle of the Air Loop diagram.

Last you would probably want to assign Design Specification Outdoor Air so you can control the amount of outdoor air entering the space.

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From the Spaces tab select the Properties tab and then click the Library tab on the upper right. Find the Design Specification Outdoor Air and drag one of them into the empty place. Now you can click on it to change the settings. You can read about the Design Specification Outdoor Air in the Input Output Reference.

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Avi, thank you so much for your help and detailed response! I will give that a try and let you know if that works for my situation.

pksmith gravatar imagepksmith ( 2018-02-21 09:35:03 -0600 )edit

@Avi, I have a question for you. When I run my model and have the setpoint manager control variable set to 'Mass Flow Rate' I get the following error:

" Severe * CalcMixedAirSetPoint: Missing reference temperature setpoint for Mixed Air Setpoint Manager NODE 9 OS DEFAULT SPM * ~~~ * Node Referenced =NODE 3 * ~~~ ** use an additional Setpoint Manager with Control Variable = "Temperature" to establish a setpoint at this node."

When I run the model without the control variable set to mass flow rate and instead use temperature, I get no errors.

Do you have any suggestions?

pksmith gravatar imagepksmith ( 2018-03-05 09:31:12 -0600 )edit

@pksmith Generally speaking you should open new question topic so every one could enjoy the benefit of sharing data.

Specifically, I think that since you mix outside air E+ expect you to set target air temperature. A simple work around might be to place also a temperature setpoint on that point (from the SP schedule menu just not the very same one). But again I urge you to open new topic so you can get more answers and probably better one.

Avi gravatar imageAvi ( 2018-03-05 12:57:41 -0600 )edit

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Asked: 2018-02-16 09:32:59 -0600

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Last updated: Feb 19 '18