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How to implement centralized ventilation system without heating or cooling in energyplus idf editor?

asked 2020-03-08 10:32:58 -0500

Ben_M gravatar image

Hi all, For our master thesis project i want to implement a centralized ventilation system to a school building with different zones, which is seperate from the existing heating system (baseboard heating).

We tried it with the "HVACTemplate:System:UnitarySystem" object (without heating and cooling coils) and an "HVACTemplate:Zone:Unitary" object for each zone with the first object assigned as the Template Unitary System.

Since there is already a I"HVACTemplate:Zone:BaseboardHeat" object used for heating in all existing zones, we get following severe error for each zone (e.g. the music class) and the simulation does not work:

* Severe * Duplicate name found. name: "Music class (100) Equipment". Overwriting existing object.

We are thankful for any suggestions regarding this problem. Kindly find attached our file and thanks in advance!

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answered 2020-11-27 06:25:13 -0500

updated 2020-11-27 06:25:28 -0500

There is no reasons to get a Severe Error if the same name is applied to different Object Type. The error must be elsewhere.

You should go through the IDF, objects name, but I do not find any attached file

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I confirm that the HVAC templates expansions will lead to the above mentioned errors when HVACTemplate:Zone:BaseboardHeat and HVACTemplate:Zone:Unitary are defined simultaneously for the same zone because two different ZoneHVAC:EquipmentList with the same name will be generated (one for each HVAC template object). I guess that this is OK though because the templates are not supposed to cover complex cases...

Adrien gravatar image Adrien  ( 2020-11-30 09:43:19 -0500 )edit

@Adrien, thank you for having shared your deeper analysis

Ag gravatar image Ag  ( 2020-12-01 03:45:13 -0500 )edit
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answered 2020-11-27 20:40:40 -0500

This is going to be the long way to get there, but it seems like it would benefit you..

If it were me, I'd download and install CBECC-Com which is a free software interface for doing code compliance in California. However, it runs on the EnergyPlus engine and installs with sample files, including two with DOAS systems (dedicated outdoor air system ==> aka centralized ventilation systems). Open one of the sample models such as Documents\CBECC-Com 2019.1.3 SP1 Projects\OtherTests2019\RetlSml-DOAS+FPFC19.cibd19, run it, and then find the IDF file for the proposed file in the project directory.. This will give you an idea of how a system would actually be set up, and you can modify from there.

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answered 2020-11-27 04:10:04 -0500

Adrien gravatar image

Since HVACTemplate:Zone:Unitary has some fields named "Baseboard Heating...", I think that it can do the same as HVACTemplate:Zone:BaseboardHeat and more, and I guess that you can safely delete the HVACTemplate:Zone:BaseboardHeat objects after having reported their configurations to your HVACTemplate:Zone:Unitary objects... can someone with experience please confirm?

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Asked: 2020-03-08 10:32:58 -0500

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Last updated: Nov 27 '20