[Equest-users] VRF in eQUEST

Matt Clough mclough at kme-inc.com
Fri Jul 6 06:07:22 PDT 2012


I'm not really sure what the LEED reviewers are expecting to see.  I haven't tried this technique for a LEED submission, so maybe other members could shed some light on this issue.

But, yes.  The condenser units don't explicitly show up in the model.  If you want to see the condenser units explicitly shown, use the WSHP/PVVT approach, which shows the condenser units as the heat rejection component, and the fan coils as the PVVT component.  I believe this will give you more conservative energy usages because equest only allows for a single speed compressor.

Regards,
Matt Clough

From: Eleni Soulti [mailto:elenisoulti at co2engineering.eu]
Sent: Friday, July 06, 2012 2:01 AM
To: Matt Clough
Cc: equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] VRF in eQUEST

Matt,

Thank you very much for your answer. So, when modelling one PVVT for each room, the external VRF units don't appear in the model at all if I understand correctly? My concern is that LEED will expect to see in the model the four units that we actually have in the building.

I see what you mean with the numbering system, but this only helps us, without actually being taken into consideration somehow in the model, doesn't it? Thanks again.

Eleni Soulti

On behalf of

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From: Matt Clough [mailto:mclough at kme-inc.com]
Sent: 05 July 2012 13:36
To: Eleni Soulti
Cc: equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] VRF in eQUEST

Eleni,

>From what I understand, each PVVT system represents one of the fan coil units.  When you go back through and make the hourly reports, the energy consumption from each zone is added together to represent the total energy usage of the entire VRF system.  Take note of the numbering system that is used in the presentation:  1-2,  1-3.  The first number identifies the CU that the PVVT/FCU is connected to, and the second number is the FCU id.  They create hourly reports and go back to do some calculation with excel.

As far as input values, I would guess that you could add existing data for the spaces, such as flow rate and temperature setpoints.  You could also let it autosize the units.  I'm not really sure what would be best.

Good Luck,
Matt Clough


From: Eleni Soulti [mailto:elenisoulti at co2engineering.eu]
Sent: Tuesday, July 03, 2012 4:07 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>; bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Subject: [Equest-users] VRF in eQUEST

Dear all,

I am trying to model a VRF system as Packaged Variable Volume Variable Temperature system.

My building has four external VRF units connected to terminal units for each space in the interior. According to the power point presentation on the subject, it should be modelled as PVVT with separate system for each zone. In this case what values would you use? Would it be the same as my original model or is there a way to define values with different proportions based on the initial ones?

Wouldn't it make more sense to design 4 PVVT as many as the VRF I have? And in this case which is the zone controlling the system? If I 'm not wrong, eQUEST only allows to choose one.

And one more general question: eQUEST creates by default plenum for each space and HVAC systems with all zones. Would you remove these default HVAC systems together with the unconditioned spaces and plenums?

Thank you very much.

Best regards,

Eleni

On behalf of

CO2
Engineering

Oficina Sevilla
Cartuja - Edificio Marie Curie
C/Leonardo da Vinci 18, Planta1 3ºB
41092 Sevilla | España
T. (0034) 679883055

London Office
17, Bishops Close
E17 9RP London | UK
T. (0044) 7969235926

Oficina Huelva.
Plaza Hermanos Costalero nº 2, 6º A
21001 Huelva | España
T. (0034) 647143558

w.   www.co2engineering.eu<http://www.co2engineering.eu/>
e.   francisgn at co2engineering.eu<mailto:francisgn at co2engineering.eu>

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