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

Sherif Farag sherif.sabr at gmail.com
Wed May 27 06:26:15 PDT 2015

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> 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.
> Regards,
> Rathnashree
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