[Equest-users] Samsung VRF System

Morteza Kasmai via Equest-users equest-users at lists.onebuilding.org
Mon Apr 10 07:55:52 PDT 2017


Thank you so much for your guidance. This project is a mid-rise residential
building with total off 66 units and retail space in the ground floor. In
addition to the VRF systems, the mechanical systems contain a RTU that
provides fresh air of the units, and corridors, VAVS for the retail section
and many UHTs in heated only spaces. I am using eQUEST 3.65 build 7173 so I
employed DOE-2.3 for this project and selected VRF-HP-Resys performance
curves for the VRF units. After resolving the associated errors due to the
change of DOE version, the simulation was complete without errors but with
too many cautions on “Convergence failure: 30 DayCLs”. In addition, BEPU
and BEPU reports were blank, showing no results for the simulation. I have
tried several times but the simulation reports were the same. Therefore, I
decided to go back to DOE-2.2 but use the related performance curves of the
condensing units within the DOE-2.3 library for the VRF systems. This time
the simulation results were very close to the one that I got when I used
Daikin performance curves for VRF units.

Please let my know if this approach is correct. In addition, per guidelines
provided by Daikin, I select PSZ units for VRF systems. Now that I use
performance curves that are provided for “Residential System”, should I
change the system type to “Residential System” as well?

Thank you for your time,

On Fri, Apr 7, 2017 at 5:01 PM, David Griffin II <DGriffin at archnexus.com>

> Morteza,
> Depending on the size of your VRF system and what other systems you are
> trying to model, you may consider employing DOE 2.3 which has a residential
> VRF system built in. You can use the default curves for the system type
> rather than try and hunt down the curves from the manufacturer.
> Let us know how it goes if you choose this route.
> Thanks!
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> *From:* Morteza Kasmai via Equest-users [mailto:equest-users at lists.
> onebuilding.org]
> *Sent:* Friday, April 07, 2017 9:19 AM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] Samsung VRF System
> Dear eQUEST experts,
> I am trying to model Samsung VRF unit in my LEED project. I have modeled
> Daikin VRF units in other projects, using the manufacturer’s performance
> curves and guidelines for modeling these systems in eQUEST with no problem.
> However, it seems that the Samsung representative is not able to provide
> the performance curve of the condensing units. Is there any way to model
> this system without having the performance curves?
> I truly appreciate your help,
> Morteza
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