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

["Jeremiah Crossett jcrossett@xxxxxxxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

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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7411 SW Capitol Highway | Portland, OR 97219 

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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

    

     

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Posted by: Jeremiah Crossett <jcrossett@xxxxxxxxxxxxxxx>

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