[Equest-users] VRF Modeling Guide

[Brian Fountain]

Based upon the error message, it appears that the DOAS system was not created or not linked to the VRF systems.  In detailed edit mode you can create a system type DOAS (if it has not been created already) and then set that system as the source of outdoor air in the DOA System keyword for each of your VRF systems:

[cid:image002.jpg at 01D4FFEC.BED4AA40]

Note that when you use the DOA System keyword, there is a required keyword DOA-ATTACHES-TO that does not have a keyword.  It specifies whether the Dedicated Outdoor Air system delivers air directly to the conditioned zone or whether it goes to the inlet of your VRF fan coil.  As such, it is helpful to set the User Default on DOA-ATTACHES-TO.

It may be helpful to provide the .inp and .pd2 to the userlist to better troubleshoot the error you are encountering.


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Brian Fountain
Associate

From: Equest-users <equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org>> On Behalf Of Dilshad Ahmed Khan via Equest-users
Sent: Wednesday, May 1, 2019 2:05 AM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] VRF Modeling Guide

Hello everyone! I am working on energy simulation of a school building which has VRF HVAC system. I used DD Wizard to create VRF HVAC System type and assigned some zones to it. But when I finish the DD Wizard I get some errors (Attached Screen). Someone please explain this error. Do I need to enter some more details for VRF system in Detailed Edit mode?

Any help would be highly appreciated.

Thanks.
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