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[EnergyPlus_Support] RE: G-function_GSHE_Help!





How should the examples of GLHERefData.idf be corrected?

Consider the example below. I think that 13.0 is the ground temperature. Should 0.418483E+04 be simply deleted? What is equal to 998.2?

Regards



  GroundHeatExchanger:Vertical,

    Vertical GHE 4x4 Enhanced,  !- Name

    GHE Inlet Node 4x4 Enhanced,  !- Inlet Node Name

    GHE Outlet Node 4x4 Enhanced,  !- Outlet Node Name

    0.00242,                 !- Maximum Flow Rate {m3/s}

    16,                      !- Number of Bore Holes

    76.2,                    !- Bore Hole Length {m}

    0.05715,                 !- Bore Hole Radius {m}

    2.493,                   !- Ground Thermal Conductivity {W/m-K}

    2.4957E+06,              !- Ground Thermal Heat Capacity {J/m3-K}

    0.418483E+04,            !- Ground Temperature {C}

    13.0,                    !- Design Flow Rate {m3/s}

    0.00242,                 !- Grout Thermal Conductivity {W/m-K}

    1.4714,                  !- Pipe Thermal Conductivity {W/m-K}

    0.389,                   !- Pipe Out Diameter {m}

    0.582,                   !- U-Tube Distance {m}

    998.2,                   !- Pipe Thickness {m}

  &n

   **   ~~~   ** ...Pipe Thickness=[998.200].

   **   ~~~   ** ...Pipe Out Diameter=[0.389].

   **   ~~~   ** ...Radius will be <=0.

   ** Warning ** GroundHeatExchanger:Vertical="VERTICAL GROUND HEAT EXCHANGER", invalid value in field.

   **   ~~~   ** ...Maximum Length of Simulation less than RunPeriod Request

   **   ~~~   ** Requested input=0 will be set to 1


Just go through all the inputs for that object and make sure the values make sense to match that version of E+.  It looks like a field is missing or something.  Because it shows thickness at 998.2, which is more like a density value.



On Fri, Nov 1, 2013 at 10:57 AM, <silvia1-@...> wrote:
 

I've already tried to use one of the dataset g-functions but they gave me some problems...




Program Version,EnergyPlus-Windows-OMP-64 7.2.0.006, YMD=2013.11.01 17:55,IDD_Version 7.2.0.006

   ************* Beginning Zone Sizing Calculations

   ** Warning ** Site:GroundTemperature:BuildingSurface: Some values fall outside the range of 15-25C.

   **   ~~~   ** These values may be inappropriate.  Please consult the Input Output Reference for more details.

   ** Warning ** CheckUsedConstructions: There are 4 nominally unused constructions in input.

   **   ~~~   ** Each Unused construction is shown.

   ************* Construction=CONSTGLZ7580

   ************* Construction=CONSTGLZ5679

   ************* Construction=CONSTGLZ4471

   ************* Construction=CONSTGLZ3045

   ************* Beginning Plant Sizing Calculations

   ** Severe  ** GroundHeatExchanger:Vertical="VERTICAL GROUND HEAT EXCHANGER", invalid value in field.

   **   ~~~   ** ...Pipe Thickness=[998.200].

   **   ~~~   ** ...Pipe Out Diameter=[0.389].

   **   ~~~   ** ...Radius will be <=0.

   ** Warning ** GroundHeatExchanger:Vertical="VERTICAL GROUND HEAT EXCHANGER", invalid value in field.

   **   ~~~   ** ...Maximum Length of Simulation less than RunPeriod Request

   **   ~~~   ** Requested input=0 will be set to 1

   **  Fatal  ** Errors found in processing input for GroundHeatExchanger:Vertical

   ...Summary of Errors that led to program termination:

   ..... Reference severe error count=1

   ..... Last severe error=GroundHeatExchanger:Vertical="VERTICAL GROUND HEAT EXCHANGER", invalid value in field.

   ************* Warning:  Node connection errors not checked - most system input has not been read (see previous warning).

   ************* Fatal error -- final processing.  Program exited before simulations began.  See previous error messages.

   *************

   ************* ===== Final Error Summary =====

   ************* The following error categories occurred.  Consider correcting or noting.

   ************* Nominally Unused Constructions

   ************* ..The nominally unused constructions warning is provided to alert you to potential conditions that can cause

   ************* ..extra time during simulation. Each construction is calculated by the algorithm indicated in the HeatBalanceAlgorithm

   ************* ..object. You may remove the constructions indicated (when you use the DisplayExtraWarnings option).

   *************

   ************* EnergyPlus Warmup Error Summary. During Warmup: 0 Warning; 0 Severe Errors.

   ************* EnergyPlus Sizing Error Summary. During Sizing: 2 Warning; 0 Severe Errors.

   ************* EnergyPlus Terminated--Fatal Error Detected. 3 Warning; 1 Severe Errors; Elapsed Time=00hr 00min 10.01sec 



---In energyplus_support@xxxxxxxxxxxxxxx, <leeed2001@...> wrote:

G-functions are not specific to a building, but specific to a borehole (field).  E+ contains a small dataset of g-functions (<E+ install dir>/DataSets/GLHERefData.idf) that you may be able to use that closely meets the needs of your building.  If you need something more specific, you'll have to figure out a way to generate a more specific g-function (http://www.hvac.okstate.edu/research/Documents/ASHRAE/Yavuzturk_Spitler_99.html).


On Fri, Nov 1, 2013 at 10:33 AM, <silvia1-@...> wrote:
 

Hi, I'm a student and I don't have GSHE-Pro but I need a G-function for my research on energy efficiency measures and I want ask if someone can generate for me a G-function specific for my building? Thanks




--
Edwin Lee, PhD
Engineer, Commercial Buildings Research Staff
National Renewable Energy Laboratory




--
Edwin Lee, PhD
Engineer, Commercial Buildings Research Staff
National Renewable Energy Laboratory



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