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Re: [EnergyPlus_Support] Outdoor Air / Mechanical Ventilation in VRF



I apologize; I did not look closely enough the first time.
I am now looking at your .svg file and see that no air handler is providing air to the VRFs.  Some zone equipment can bring in outdoor air directly, but I don't think VRF is one of them.
I think that you must define a DOAS air loop which provides outdoor air to each of the VRF zones, something similar to the DOASDXCOIL_wADPBFMethod.IDF example file

p.s., My last VRF project was prior to the capability pf E+ top model a heat recovery VRF system, so I used another approach.

On Mon, Oct 27, 2014 at 1:47 PM, Jeremiah Crossett jcrossett@xxxxxxxxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
 

I noticed what Jim mentioned as well-- Also for for the report you are looking for I think you need to specify "VentilationRateProcedure" in the System Outdoor Air Method field of the system sizing, see below.

AirLoop Name DOASBuilding2:EastClassrooms
Type of Load to Size On VentilationRequirement
Design Outdoor Air Flow Rate autosize
Minimum System Air Flow Ratio 1.0
Preheat Design Temperature 2
Preheat Design Humidity Ratio 0.008
Precool Design Temperature 11
Precool Design Humidity Ratio 0.008
Central Cooling Design Supply Air Temperature -17.7777777777778
Central Heating Design Supply Air Temperature -17.7777777777778
Sizing Option NonCoincident
100% Outdoor Air in Cooling Yes
100% Outdoor Air in Heating Yes
Central Cooling Design Supply Air Humidity Ratio 0
Central Heating Design Supply Air Humidity Ratio 0
Cooling Design Air Flow Method DesignDay
Cooling Design Air Flow Rate 0
Heating Design Air Flow Method DesignDay
Heating Design Air Flow Rate 0
System Outdoor Air Method VentilationRateProcedure
Zone Maximum Outdoor Air Fraction




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Jeremiah D. Crossett  | Senior Analyst  | LEED Green Associate 
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On Mon, Oct 27, 2014 at 10:30 AM, adriana.lira@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
 

Hi Jim!


I have two systems in this model:
1.- Central system, where the zones have 0 people, indeed.
2.- VRF Terminal Units, which zones do have people. These zones are:
      - TECBLG1F:INFOMAINTENANCE
      - TECBLG1F:OPERATIONS
      - OFFBLG1F:OPENOFFICE
      - OFFBLG1F:RECEPTION
    &nbs p; - OFFBLG1F:CONFROOM2
      - OFFBLG1F:CONFROOM1
      - OFFBLG2F:OFFICE2
  &nb sp;   - OFFBLG2F:OPENOFFICE
      - OFFBLG2F:OFFICE1

 When I simulate the model, the OUTDOOR AIR SUMMARY section of the report, shows zero mechanical ventilation. 

Reading previous conversations, I noticed that several people had the same problem regarding VRF systems, before.

Have you modeled VRF?

Best,

Adriana
    
     





--

 

James V Dirkes II, PE, BEMP, LEED AP
The Building Performance Team
1631 Acacia Drive, Grand Rapids, MI 49504

The more one does what is good, the freer one becomes. There is no true freedom except in the service of what is good and just.



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Posted by: Jim Dirkes <jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx>


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