[EnergyPlus_Support] RE: G-function_GSHE

Yes, new E+ documentation showing ground source heat pump G-functions has problem of matching figures and comments. Seems some comment fields (lines) are missing so that all the comment fields below those missed texts were shifted up.

---In energyplus_support@xxxxxxxxxxxxxxx, <silvia1-@...> wrote:

OK I will try...thank you very much!

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

I'm not sure why it didn't work immediately, but the errors are pretty clear:

** 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

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

[EnergyPlus_Support] RE: G-function_GSHE_Help!