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Re: [EnergyPlus_Support] Electric Chiller: air cooled
The message is warning you that an "air cooled" chiller is operating
when outdoor temperatures are below 0C. This type of operation could
freeze the chiller barrel and damage the unit. Good thing it is only a
simulation. What type of loads are in your building that require cooling
when it is 0C outside? How about scheduling you chiller off in the
winter and using an economizer.
Elmer Morrissey wrote:
> Hello all,
>
> I'm am getting the following error from an electric chiller (air
> cooled) which supplies the cool water at 7C for the cooling coil in
> the AHU...
>
> ElectricChillerModel:Air Cooled Condenser Inlet Temperature below 0C
> continues
>
> Can anyone point me where I would remove this error?
>
> My chiller definition looks like this
>
> CHILLER:ELECTRIC,
> Z1:Plant1, !- Chiller Name
> AIR COOLED, !- Condenser Type
> autosize, !- Nominal Capacity {W}
> 3.2, !- COP
> Z1:Plant1In, !- Plant_Side_Inlet_Node
> Z1:Plant1Out, !- Plant_Side_Outlet_Node
> ZC1:Plant1In, !- Condenser_Side_Inlet_Node
> ZC1:Plant1Out, !- Condenser_Side_Outlet_Node
> 0, !- Minimum Part Load Ratio
> 1, !- Maximum Part Load Ratio
> 0.65, !- Opt Part Load Ratio
> 35, !- Temp Design Condenser Inlet {C}
> 2.778, !- Temp Rise Coefficient
> 6.67, !- Temp Design Evaporator Outlet {C}
> autosize, !- Design Evaporator Volumetric Water
> Flow Rate {m3/s}
> autosize, !- Design Condenser Volumetric Water
> Flow Rate {m3/s}
> 0.9949, !- Coefficient1 of the capacity ratio
> curve
> -0.045954, !- Coefficient2 of the capacity ratio
> curve
> -0.0013543, !- Coefficient3 of the capacity ratio
> curve
> 2.333, !- Coefficient1 of the power ratio curve
> -1.975, !- Coefficient2 of the power ratio curve
> 0.6121, !- Coefficient3 of the power ratio curve
> 0.03303, !- Coefficient1 of the full load ratio
> curve
> 0.6852, !- Coefficient2 of the full load ratio
> curve
> 0.2818, !- Coefficient3 of the full load ratio
> curve
> 5, !- Temp Lower Limit Evaporator Outlet
> {C}
> ConstantFlow; !- Chiller Flow Mode
>
> I've attempted reducing the design inlet temperature into the
> condenser but it doesn't appear to be making a difference. Also the
> cooling coil is not reducing the temperature of the outlet air
> stream to the desired temp of 12C. It gets close (13C) but never
> quite down there at peak times.
>
> I appreciate the help, kind regards
>
> -Elmer
>
>
>
>
>
>
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>
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>
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--
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
[Non-text portions of this message have been removed]
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