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
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, PhDEngineer, Commercial Buildings Research StaffNational Renewable Energy Laboratory--Edwin Lee, PhDEngineer, Commercial Buildings Research StaffNational Renewable Energy Laboratory