We've done some modeling of the VRF in EnergyPro.
The results are quite favorable, compared to traditional split systems.
Our understanding, as of last week, is that the module for modeling VRF
that is included in Trace is not endorsed by either of the major manufacturers.
(Mitsubishi & Daikin) So, from their perspective, Energy Pro is currently
the ONLY way to model VRF.
We've had some internal debate as to what the corresponding 90.1 baseline
system should be. I'd live to hear people's thoughts.
Travis R. English, P.E., LEED AP
Regarding the baseline system. If you are using Chapter 11 ECB, the
budget system would be System 8, Packaged Terminal Heat Pump if it is a
residential application and System 9, Packaged Rooftop Heat Pump if
non-residential. If you are using Appendix G, then the baseline system
depends on the building program per Table G.3.1.1A
Michael Rosenberg
Travis,
Good to hear the system is showing savings. We have a couple projects
coming up that are using or proposing VRF systems and it will be
interesting to see how the system operates in various climates. I
imagine the VRF will perform better in certain climates.
With regards to endorsement from manufacturers, I know Martyn Dodd at
Energy Pro worked with Mitsubishi directly to develop the VRF module.
I agree with Mike on the baseline system choices.
Sam Mason
Some independent M&V case studies would be very useful. Also I'd like to see some of the validation work on the component model.
It will be important to have some information to verify the model results, regardless if the simulation was through a new module for an existing program or through a work-around.
David
Dear All,
I am getting this error, while simulating an office building in eQuest.
"ERROR*****EXTERIOR-WALL Exterior Wall 87 defined on line 4056 has a
negative net area"
A number of external walls are not visible in 3-d view now.
I have started working with e-Quest just a few months back and have no idea
what this error says about or what modification it needs.
Any help will be appreciated.
Regards,
Prabhat Barnwal
Delete EXTERIOR-WALL Exterior Wall 87. Take care to make sure you don't
put more glass sf then wall sf.
Timothy Howe, MS, LEED(r) AP
Break up the window so that the area of the window is less than the parent
wall. There is a lot in the archives regarding this issue. This can get
complicated if you don't have your spaces sized right.
Kevin Kyte, LEED AP
I really liked this information.