[Equest-users] VRV System Modeling

[Matthew Higgins]

David - I'm currently using Daikin's proprietary EnergyCalc program to 
come up with performance curves for equipment and then interpolate those 
points to HVAC performance data in eQuest. Modulating loads on 
condensers and other parameters are necessary, but it appears to be a 
worthy endeavor. The reps don't like this approach much, and feel as 
though we should be seeing greater energy savings, but in our case we 
don't have time to build two models for every project using VRV 
equipment. The reason I say this is because I feel that eQuest is a much 
more powerful design and evaluation tool.

If anyone can add/comment on this process please do so.

Regards

Matthew Higgins, LEED AP + ASHRAE-HBDP
Building Performance Specialist
Environmental Dynamics, Inc.
Architecture and Sustainability Consulting Services
505.242.2851

Any data provided by the Consultant, verbal or written, are to be considered opinions of building energy and/or daylight performance. The Client understands that the Consultant has no control of occupant habits, equipment or material performance or characteristics, site or climate conditions or the Contractor's method of assembly, and that the Consultant's opinions regarding building energy/daylight performance are made on the basis of the Consultant's professional judgment and experience. The Consultant makes no warranty, express or implied, that the energy/daylight performance of the building will not vary from the Consultant's opinion of building energy/daylight performance.

Dave Hostetter wrote:

> Hello All,
>
> I am working on a few projects which utilize Daikan VRV systems and I 
> am trying to model them using eQuest, without much luck. I have talked 
> with a couple of different people, including some at Daikan and 
> eQuest, and have heard that as of right now the only full building 
> energy modeling program that supports VRV systems is EnergyPro. I was 
> also told that an update to DOE2.2 and then eQuest which will address 
> VRV systems is in the works, but that these updates will most likely 
> not be out for a couple of months yet (maybe into next year). I also 
> have heard that there have been some people who have been able to 
> approximate VRV systems within eQuest.
>
> So my questions to all of you are:
>
> 1). What would be the best / most accurate approach to create a model 
> of a building with a VRV system? Unfortunately I don’t think that we 
> can wait a few months for the updates, so would it make most sense to 
> purchase EnergyPro or try to use a workaround method within eQuest? Or 
> is there some third option that I am unaware of?
>
> 2). Does anyone know how to approximate a VRV system within eQuest and 
> could explain it to me? What kind of accuracy could I expect from this 
> method?
>
> Any help would be much appreciated!
>
> Thanks,
>
> David P. Hostetter
>
> EIT, LEED AP
>
> Project Engineer
>
> Integrated Holistic Design, LLC.
>
> C: (717) 799-0599
>
> 2019C Miller Road
>
> East Petersburg, PA 17520
>
> ihd LOGO email smaller
>
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