[Bldg-sim] VRF performance curve

[Chris Yates]

Interesting post and thanks for the info - I find VRF a bit of a 'black
box' when it comes to modelling. Part of the issue is the huge variety of
indoor/ outdoor unit combinations.

I have no doubt that the better VRF systems are a superb technology.
However, I do believe some of the performance claims are audacious (I can
only speak of the European market). For example, heat recovery VRF with
seasonal average heating COP (kW/kW)  > 8.0 and seasonal Cooling EER > 6 is
competing with centrifugal chillers - the most advanced VRF compressor
technology I know of is scroll.

I guess part of my beef is not trusting the Euro test standards for VRF!

Bye for now

Chris

On Wed, May 27, 2015 at 3:18 PM, Qureshi, Harris <Harris.Qureshi at stantec.com
> wrote:

> Hi Rathna,
>
>
>
> What software are you using ? You might want to go through the attached
> modelling protocol attached from LG as Sherif mentions .
>
>
>
> Harris
>
>
>
> *Harris Qureshi, B.E(Mech), MSc. Energy, LEED AP Homes*
>
> Mechanical Engineer
> Stantec
> Dubai Investment Park, PO Box 52764 Dubai UAE
> Phone: +971-4-812-5947
> Cell: +971-50-189-9924
> Harris.Qureshi at stantec.com
>
>
>
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> *From:* Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org
> <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
> *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).
>
> Thanks;
>
> 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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