In large part, a coil’s performance is defined by its part load curves. You should be able to define the coil curves to match the manufacturer performance. In the case of a VRF, it is essentially a heat pump, although it is in real life almost exclusively a multi-zone system so it is unusual that you would use such a system for DOAS.
James V Dirkes II, PE, BEMP, LEED AP
www.buildingperformanceteam.com
Energy Analysis, Commissioning & Training Services
1631 Acacia Drive, Grand Rapids, MI 49504 USA
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of ???
Sent: Monday, August 05, 2013 1:14 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] VRF Dedicated Outdoor Air System with ERV
Thanks for the prompt response.
The other question is that the DOAS’s cooling coil is VRF type, is it possible to set this coil in EnergyPlus?
Thanks.
Stan Ho
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Bereket Nigusse
Sent: Monday, August 05, 2013 12:11 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] VRF Dedicated Outdoor Air System with ERV
Stan,
You can model the VRF and the DOAS as a separate systems serving each zone. To do this:
(1) set the outdoor air flow rates in " ZoneHVAC:TerminalUnit:VariableRefrigerantFlow" objects to zero.
(2) set up a central DOAS system that supplies the required amount of outdoor air to each zone.
(3) connect the terminal air distribution units of the DOAS system to each zone
(4) Make the DOAS terminal unit first priority and the VRF Zone Object the second priority in "ZoneHVAC:EquipmentList". The equipment set up in example file "ZoneWSHP_wDOAS" is a good starting point to understand the connection though this example is a single zone.
Hope this helps.
Bereket Nigusse
Florida Solar Energy Center
From: kkkimostan <tzunghan.ho@xxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Sunday, August 4, 2013 11:12 AM
Subject: [EnergyPlus_Support] VRF Dedicated Outdoor Air System with ERV
Hello,
I am simulating a building with VRF system for each thermal zone, and a VRF Dedicated Outdoor Air System with ERV. I cannot decide which is a good method to simulate this VRF Dedicated Outdoor Air System with ERV. It seems that the HVAC template DOAS cannot been assigned to VRF system. Is there any good methodology for this VRF DOAS ERV system? Thanks for the help.
Stan Ho
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