[Equest-users] [Bldg-sim] VRF performance curve

Qureshi, Harris Harris.Qureshi at stantec.com
Wed May 27 07:18:02 PDT 2015

Hi Rathna,

What software are you using ? You might want to go through the attached modelling protocol attached from LG as Sherif mentions .


Harris Qureshi, B.E(Mech), MSc. Energy, LEED AP Homes
Mechanical Engineer
Dubai Investment Park, PO Box 52764 Dubai UAE
Phone: +971-4-812-5947
Cell: +971-50-189-9924
Harris.Qureshi at stantec.com<mailto:Harris.Qureshi at stantec.com>


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From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Sherif Farag
Sent: Wednesday, May 27, 2015 5:26 PM
To: Rathna Shree
Cc: BldgSim Mailing List; equest-users at onebuilding.org<mailto:equest-users at onebuilding.org>
Subject: Re: [Bldg-sim] VRF performance curve

Hi Rathna,
LG has a plug-in that works good with eQuest, I tried it and I noticed the % of energy saving will be on the region of 20% when compared to PTAC (Not compared to the App G. Baseline).
Sherif Farag
Technical Director
Integrated Environmental Services (IES) Ltd.
Abu Dhabi - UAE

On May 27, 2015, at 11:18 AM, Rathna Shree <rathnashreep at yahoo.in<mailto:rathnashreep at yahoo.in>> wrote:

Dear All,

I worked on a couple of projects in equest  using the VRF performance curves from Daikin and LG. The methodology i followed is as below:

1) Modelled packaged VAV with minimum flow ratio 1.
2) Created systems based on number of ODU's and assigned multiple zones to the respective ODU. (Just like modelling a AHU)
3) Inputted the ODU Cooling capacity and supply flow
4) Fans will be constant volume.
5) Since it is a cooling only system, i assigned only the "Cool EIR - fEWB-OAT", "Cool-EIR-fPLR" and "Cool cap-fEWB&OAT" curves. Rest were all default DX unit curves.

 PVAV system is used as PSZ system cannot handle multiple zones well thus causing unmet hours.

I did 2 trials, one with default DX curves and the other with performance curves from LG and Daikin. The results showed a decrease in cooling energy consumption by more than 30% thus impacting the overall energy consumption by more than 10%.

Is the simulation methodology and results appropriate? I feel the savings is on a higher side.

Please advise.

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