Re: [EnergyPlus_Support] VRF water-cooled condensers.

[Richard Raustad <RRaustad@xxxxxxxxxxxx>]

It sounds like may not have been corrected for a water-cooled system.

But the code does use the condenser water inlet node at the temperature here so it may be just that the warning is confusing.
Maybe just the text needs correction.

   **   ~~~   ** ... Outdoor Unit Inlet Water Temperature                 = 35.077

First check to see what the actual water temperature is entering the condenser.

  AirConditioner:VariableRefrigerantFlow,
    -5,                      !- Minimum Outdoor Temperature in Cooling Mode {C}
    43,                      !- Maximum Outdoor Temperature in Cooling Mode {C}
    -20,                     !- Minimum Outdoor Temperature in Heating Mode {C}
    20,                      !- Maximum Outdoor Temperature in Heating Mode {C}

Or you could just raise the max inputs to be greater than the maximum OAT and lower the min inputs to be less than the min OAT.

You should send your input file to the help desk so they can correct the problem.
support@xxxxxxxxxxxxxxxxxxxxxxxx

On 10/24/2012 1:56 PM, Omar Tabuyo wrote:

i used you advice to build the model, but when running this warning is showed:

   ** Warning ** AirConditioner:VariableRefrigerantFlow "VRF EXTERIORUNIT01 PBYP1".

   **   ~~~   ** ...InitVRF: VRF Heat Pump Min/Max Outdoor Temperature in Heating Mode Limits have been exceeded and VRF system is disabled.

   **   ~~~   ** ... Outdoor Dry-Bulb Temperature                 = 35.077

   **   ~~~   ** ... Heating Minimum Outdoor Dry-Bulb Temperature = -20.000

   **   ~~~   ** ... Heating Maximum Outdoor Dry-Bulb Temperature = 35.000

   **   ~~~   ** ... Check VRF Heat Pump Min/Max Outdoor Temperature in Heating Mode limits.

   **   ~~~   **  During Warmup, Environment=BARCELONA INVIERNO, at Simulation time=01/01 19:00 - 19:15

Anyone kown how i can solve it? Which is the Heating Min/Max Outdoor Dry-Bulb Temperature infuence in the VFR water condenser?

thanks

---

De: Richard Raustad <RRaustad@xxxxxxxxxxxx>
Para: EnergyPlus_Support@xxxxxxxxxxxxxxx
Enviado: Lunes 22 de octubre de 2012 19:01
Asunto: Re: [EnergyPlus_Support] VRF water-cooled condensers.

 

Yes, use a single plant loop to serve the VRF condenser.
Here's a file I have been playing with.
The imf file is the building and VRF system.
The idf is the plant loop.
The in.idf file is these two files after EPMacro assembles them together.

On 10/22/2012 12:47 PM, Omar Tabuyo wrote:

Dear all,

I am trying to simulate a VRF water condenser. I know that you can do it with version 7.2. In proyect, the water temperature is defined between 35ºC and 20ºC, so, I should include a boiler in the condenser loop.

Is this configuration possible today in energyplus? Anyone know how i can simulate it?

Thanks in advance

-- 
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL  32922-5703
Phone:   (321) 638-1454
Fax:     (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu

UCF - From Promise to Prominence: Celebrating 40 Years

-- 
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL  32922-5703
Phone:   (321) 638-1454
Fax:     (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu

UCF - From Promise to Prominence: Celebrating 40 Years

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