I am guessing here but I suspect that you are using HVACTemplate objects? If so, look for the expidf file after a simulation and then look for the Coil:Cooling:DX object. If no HVACTemplate objects are used then the dx cooling coil will be in your input file.
Here is an example:
Coil:Cooling:DX:SingleSpeed,
Furnace ACDXCoil 1, !- Name
FanAndCoilAvailSched, !- Availability Schedule Name
25000, !- Rated Total Cooling Capacity {W}
0.75, !- Rated Sensible Heat Ratio
3.0, !- Rated COP
1.3, !- Rated Air Flow Rate {m3/s}
, !- Rated Evaporator Fan Power Per Volume Flow Rate {W/(m3/s)}
DX Cooling Coil Air Inlet Node, !- Air Inlet Node Name
Heating Coil Air Inlet Node, !- Air Outlet Node Name
WindACCoolCapFT, !- Total Cooling Capacity Function of Temperature Curve Name
WindACCoolCapFFF, !- Total Cooling Capacity Function of Flow Fraction Curve Name
WindACEIRFT, !- Energy Input Ratio Function of Temperature Curve Name
WindACEIRFFF, !- Energy Input Ratio Function of Flow Fraction Curve Name
WindACPLFFPLR; !- Part Load Fraction Correlation Curve Name
The performance curves are the last 5 input fields shown above. These curves tell the program how the coil performs at various conditions. These performance curves can either be curve objects (Curve:*) or you could use the table objects (Table:*). You are probably using the curve objects.
Curve:Biquadratic,
WindACCoolCapFT, !- Name
0.942587793, !- Coefficient1 Constant
0.009543347, !- Coefficient2 x
0.000683770, !- Coefficient3 x**2
-0.011042676, !- Coefficient4 y
0.000005249, !- Coefficient5 y**2
-0.000009720, !- Coefficient6 x*y
12.77778, !- Minimum Value of x
23.88889, !- Maximum Value of x
18.0, !- Minimum Value of y
46.11111, !- Maximum Value of y
, !- Minimum Curve Output
, !- Maximum Curve Output
Temperature, !- Input Unit Type for X
Temperature, !- Input Unit Type for Y
Dimensionless; !- Output Unit Type
Curve:Biquadratic,
WindACEIRFT, !- Name
0.342414409, !- Coefficient1 Constant
0.034885008, !- Coefficient2 x
-0.000623700, !- Coefficient3 x**2
0.004977216, !- Coefficient4 y
0.000437951, !- Coefficient5 y**2
-0.000728028, !- Coefficient6 x*y
12.77778, !- Minimum Value of x
23.88889, !- Maximum Value of x
18.0, !- Minimum Value of y
46.11111, !- Maximum Value of y
, !- Minimum Curve Output
, !- Maximum Curve Output
Temperature, !- Input Unit Type for X
Temperature, !- Input Unit Type for Y
Dimensionless; !- Output Unit Type
See the Minimum/Maximum Value of x and y in this performance curve? Lower or raise the values in your file for CAP-FT and EIR-FT and the warning should go away. In these specific curves, x = inlet air wet-bulb temperature and y = outdoor air temperature. These curves came from the example file FurnaceWithDXSystem.idf. I assume the warnings do not show up in that file and you can use the values shown in this example (e.g., 12.77778, 23.88889, 18.0, and 46.11111)
On 5/27/2011 9:30 PM, ooikoonbeng2004 wrote:
i am not sure if the subject shouold be changed to Coil:Cooling:DX.
Thank you Richard, i would like to learn how to make adjustments, which may just be academic, to the Coil:Cooling:DX performance so that, ultimately this warning does not appear.
A search in the Engineering Reference gives a single instance of 'indoor wet-bulb' as follows
As with other table or curve objects, the lookup table can be used anywhere a valid curve object name is allowed. Care must be taken to ensure the table data format is consistent with the associate model that is using the performance curve (e.g. DX cooling coil capacity as a function of temperature where independent variable X1 = indoor wet-bulb temperature and independent variable X2 = outdoor dry-bulb temperature).
i do not know where the Performance Curves or Lookup Tables are.
All the best,
ooi
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad <RRaustad@...> wrote:
>
> These warnings just mean that the performance curves for the DX cooling
> coil do not have a wide enough range to allow calculation of the
> standard ratings. Look at the Minimum/Maximum temperatures for X (indoor
> wet-bulb temperature) and Y (outdoor dry-bulb temperature) in the curve
> objects. Refer to the Engineering Reference document for further
> information.
>
> You could edit the batch file to add PAUSE statements to see which batch
> file lines are causing these DOS messages "The system cannot find the
> files specified."
> I believe the batch file is named RunEPlus.bat. When the batch file
> pauses you could look at the DOS screen to see if a message has been
> written yet.
>
> On 5/25/2011 10:40 AM, ooikoonbeng2004 wrote:
> >
> > There is 1 Warning when the file ExerciseOutput1.idf is run. The
> > warning is Warning ** One of the Standard Ratings for
> > Coil:Cooling:DX:SingleSpeed = AHU 1 COOLING COIL could not be
> > calculated, so set to zero in output.
> > ** ~~~ ** Review the Standard Ratings calculations in the Engineering
> > Reference for this coil type. Also, use Output:Diagnostics,
> > DisplayExtraWarnings for further guidance.
> > ** ~~~ ** CheckCurveLimitsForStandardRatings: The max and/or min
> > limits specified in the corresponding curve objects did not
> > ** ~~~ ** allow the curves to be evaluated at the conditions required
> > to calculate one or more of the Standard Rating values.
> > ** ~~~ ** Coil:Cooling:DX:SingleSpeed=AHU 1 COOLING COIL: Integrated
> > Energy Efficiency Ratio (IEER) can not be calculated.
> > ** ~~~ ** Check limits in Total Cooling Capacity Function of
> > Temperature Curve , Curve Type = BIQUADRATIC, Curve Name = AHU 1 DX
> > COIL CAP-FT
> > ** ~~~ ** Check limits in EIR Function of Temperature Curve, Curve
> > Type = BIQUADRATIC, Curve Name = AHU 1 DX COIL EIR-FT
> >
> > i am not sure if the above waring has got something to do with the
> > errors shown in the DOS window
> >
> > May we all be well and happy
> > ooi
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
> > <mailto:EnergyPlus_Support%40yahoogroups.com>, "ooikoonbeng2004"
> > <ooi_kb3@> wrote:
> > >
> > > i followed your instructions in your "Tips & Tricks". When the .bat
> > file is used at the command (DOS) window, the following is shown
> > >
> > > 1 file(s) copied.
> > > 1 file(s) copied.
> > >
> > > ===== Extracting Results
> > >
> > > The system cannot find the files specified.
> > > The system cannot find the files specified.
> > > The system cannot find the files specified.
> > > The system cannot find the files specified.
> > > The system cannot find the files specified.
> > >
> > > The above was done in
> > C:\EnergyPlusv6-0-0-037\ExampleFiles\AdvancedOutput where the idf, rvi
> > and bat files are located.
> > >
> > >
> > > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
> > <mailto:EnergyPlus_Support%40yahoogroups.com>, Linda Lawrie <linda@>
> > wrote:
> > > >
> > > > use rvi and mvi files.
> > > >
> > > > Described several places in documentation including a "tips & tricks".
> > > >
> > > > At 06:09 AM 5/21/2011, Vaibhav Jain wrote:
> > > >
> > > > >How columns of output CSV files can be arranged in user desired
> > > > >order. It is easy to do so.
> > > >
> > >
> >
> >
>
> --
> 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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