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How can i model hot water loop and air loop for a single zone

asked 2017-08-24 08:42:41 -0500

Hannes gravatar image

updated 2017-08-25 04:43:47 -0500

I'm trying to model an existing building where each zone is heated by radiators (hot water) and a ventilation system. So each zone would need a hot water loop with coil:heating:water on the demand side and an air loop to get the heat from the water to the zone air, and in addition to that an air loop for the ventilation system. Both loops are heated by district heating and work separately from each other.

As Iread here EnergyPlus can´t handle two air loops per zone. So has anybody an idea how to model that? Can i model the coils via zone equipment?

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As an aside, note that the EnergyPlus team is working on allowing multiple air loops per zone at this very moment. So look for it in a future release!

shorowit gravatar imageshorowit ( 2017-08-25 05:21:06 -0500 )edit

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answered 2017-08-24 12:25:28 -0500

updated 2017-08-25 04:44:21 -0500

The situation in the question that you referenced does not apply to your building as you do not have two airloops feeding into your zone. The ventilation system in your case should be modeled as an air loop and the radiator should be modeled as a zone equipment.

The component Coil:Heating:Water is quite different from a radiator (as in real-life) and is not applicable to model radiators.

I suggest that you look at the example file named "VAVSingleDuctReheatBaseboard" about setting the system required to model your scenario (it is quite similar but not exactly). As you can see in the model, the component ZoneHVAC:Baseboard:Convective:Water can be used to model radiators. This in-turn is added to a plant loop (see BranchList). The Air Loop Main Branch (look under the Branch Class) in the example file would need to be adjusted based on the ventilation system of your building.

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Good answer! (Please note that we have a convention on UnmetHours to not include greetings ("Hi", "thanks", etc))

Julien Marrec gravatar imageJulien Marrec ( 2017-08-25 04:45:28 -0500 )edit

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Asked: 2017-08-24 08:42:41 -0500

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Last updated: Aug 25 '17