Re: [EnergyPlus_Support] Re: Advisory Messages for LEED EAp2 form

Billy,

Much of these warnings can be fixed rather easily, others should be either fixable or explainable. Question, did you generate your IDF in Design Builder? (some of these look familiar) I make it the first step in the process to fix these types of warnings on all of my models, so that warnings are important, useful and not filled with things I could fix. You should do the same, I will comment on some:

** 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.

Set them to reasonable values or even the default 18C

** Warning ** Detached shading effects are ignored when Solar Distribution = MinimalShadowing

Possibly you will want to use full exterior solar model

** Severe ** GetSurfaceData: Some Outward Facing angles of subsurfaces differ significantly from flat roof/floor base surface.

Check your sub surfaces. If possible remove anything that is not being used. Open and edit your geometry in N++, open studio etc and fix your sub surface.

** ~~~ ** Fixes will be attempted to align subsurface with base surface.
** ~~~ ** ...use Output:Diagnostics,DisplayExtraWarnings; to show more details on individual surfaces

I use display extra warnings, display all warnings, display unused objects and display unused schedules in the advanced output object, you may wish to do the same.

.
************* GetSurfaceData: There were 9 subsurfaces whose orientation (azimuth) could not be fixed to align with the base surface.
************* Shadowing calculations may be inaccurate. Use Output:Diagnostics,DisplayExtraWarnings; for details.

Check your sub surfaces. If possible remove anything that is not being used. Open and edit your geometry in N++, open studio etc and fix your sub surface. I use display extra warnings, display all warnings, display unused objects and display unused schedules in the advanced output object, you may wish to do the same.

** Warning ** CalcSurfaceCentroid: 2 Surfaces have the Z coordinate < 0.
** ~~~ ** ...in any calculations, Wind Speed will be 0.0 for these surfaces.
** ~~~ ** ...in any calculations, Outside temperatures will be the outside temperature + 9.750E-003 for these surfaces.
** ~~~ ** ...that is, these surfaces will have conditions as though at ground level.

I think these are for below ground, but you should double check.

** Warning ** GetSurfaceData: There are 4 coincident/collinear vertices; These have been deleted unless the deletion would bring the number of surface sides < 3.

You should delete these your self.. Is your geometry a GBXML import?

** ~~~ ** For explicit details on each problem surface, use Output:Diagnostics,DisplayExtraWarnings;
** Warning ** CheckUsedConstructions: There are 5 nominally unused constructions in input.
** ~~~ ** For explicit details on each unused construction, use Output:Diagnostics,DisplayExtraWarnings;
************* Beginning System Sizing Calculations
** Warning ** ManageSizing: For a plant sizing run, there must be at least 1 Sizing:Plant object input. SimulationControl Plant Sizing option ignored.

You should do a plant sizing if you have a central plant, thus add a plant sizing object, or if not you should turn off plant sizing.

************* Testing Individual Branch Integrity
************* All Branches passed integrity testing
************* Testing Individual Supply Air Path Integrity
************* All Supply Air Paths passed integrity testing
************* Testing Individual Return Air Path Integrity
************* All Return Air Paths passed integrity testing
************* No node connection errors were found.
************* Beginning Simulation
** Warning ** Coil:Cooling:DX:SingleSpeed "AIR LOOP/SOTANO AHU/1 UNITARY DX COOLING COIL" - Air volume flow rate per watt of rated total cooling capacity is out of range at 1.127E-005 m3/s/W.

You will have to get your air flows right for LEED, check your model airflow with ASHRAE 62.1

** ~~~ ** Environment=AULARIO, at Simulation time=01/01 00:10 - 00:15
** ~~~ ** Expected range for VolumeFlowPerRatedTotalCapacity=[2.684E-005--6.713E-005]
** ~~~ ** Possible causes include inconsistent air flow rates in system components,
** ~~~ ** or variable air volume [VAV] system using incorrect coil type.
** Warning ** Coil:Cooling:DX:SingleSpeed "AIR LOOP/SOTANO AHU/1 UNITARY DX COOLING COIL" - Full load outlet air dry-bulb temperature < 2C. This indicates the possibility of coil frost/freeze. Outlet temperature = -25.14 C.

You can work around this an EMS script that turns off the system when it is too cold outside.

** ~~~ ** ...Occurrence info = AULARIO, 01/01 00:10 - 00:15
** ~~~ ** ... Possible reasons for low outlet air dry-bulb temperatures are: This DX coil
** ~~~ ** 1) may have a low inlet air dry-bulb temperature. Inlet air temperature = 20.661 C.
** ~~~ ** 2) may have a low air flow rate per watt of cooling capacity. Check inputs.
** ~~~ ** 3) is used as part of a HX assisted cooling coil which uses a high sensible effectiveness. Check inputs.
** Warning ** Enthalpy out of range (PsyTsatFnHPb)
** ~~~ ** Routine=CalcDoe2DXCoil, Environment=AULARIO, at Simulation time=01/01 00:23 - 00:30
** ~~~ ** Enthalpy=-48083.47942 Pressure= 100900.00
** ~~~ ** Initial Resultant Temperature= -59.98
** Warning ** Calculated Humidity Ratio invalid (PsyWFnTdbH)
** ~~~ ** Routine=CalcDoe2DXCoil, Environment=AULARIO, at Simulation time=01/01 00:23 - 00:30
** ~~~ ** Dry-Bulb= -59.98 Enthalpy= -65947.179
** ~~~ ** Calculated Humidity Ratio= -2.3718E-003 ... Humidity Ratio set to .00001

Possibly add humidity control to your model, but others may have a better suggestion.

** Warning ** WriteVeriSumTable: InputVerificationsAndResultsSummary: Wall area based on [>=60,<=120] degrees (tilt) as walls
** ~~~ ** differs ~18.3% from user entered Wall class surfaces. Degree calculation based on ASHRAE 90.1 wall definitions.
** ~~~ ** Calculated based on degrees=[8085.092] m2, Calculated from user entered Wall class surfaces=[6833.452] m2.

** ~~~ ** Check classes of surfaces and tilts for discrepancies.

You can either change this wall to a roof or ignore it and explain that the surface tilt caused this warning.

************* Simulation Error Summary *************
** Warning ** The following Report Variables were requested but not generated
** ~~~ ** because IDF did not contain these elements or misspelled variable name -- check .rdd file
************* Key=SOTANO:DEPOSITO, VarName=ZONE MECHANICAL VENTILATION AIR CHANGE RATE, Frequency=Monthly

This indicates that your zone does not have MECHANICAL VENTILATION you may want to check to see why if your intention is to have MECHANICAL VENTILATION

Jeremiah D. Crossett | Senior Analyst | Phase Change Energy Solutions

120 E. Pritchard St. | Asheboro, NC 27203 | Mobile 503-688-8951

www.phasechange.com

On Wed, Aug 14, 2013 at 10:42 AM, billysonny1 <bscr_14@xxxxxxxxxxx> wrote:

Thanks for your reply Jeremiah,

This is part of the Error log file for one of my baseline simulations (0º).

Please advice,
Thanks in advance.

Billy Condor.

Program Version,EnergyPlus-64 7.0.0.036, 08/08/2013 10:50,IDD_Version 7.0.0.036
************* 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 ** Detached shading effects are ignored when Solar Distribution = MinimalShadowing
** Severe ** GetSurfaceData: Some Outward Facing angles of subsurfaces differ significantly from flat roof/floor base surface.
** ~~~ ** Fixes will be attempted to align subsurface with base surface.
** ~~~ ** ...use Output:Diagnostics,DisplayExtraWarnings; to show more details on individual surfaces.
************* GetSurfaceData: There were 9 subsurfaces whose orientation (azimuth) could not be fixed to align with the base surface.
************* Shadowing calculations may be inaccurate. Use Output:Diagnostics,DisplayExtraWarnings; for details.
** Warning ** CalcSurfaceCentroid: 2 Surfaces have the Z coordinate < 0.
** ~~~ ** ...in any calculations, Wind Speed will be 0.0 for these surfaces.
** ~~~ ** ...in any calculations, Outside temperatures will be the outside temperature + 9.750E-003 for these surfaces.
** ~~~ ** ...that is, these surfaces will have conditions as though at ground level.
** Warning ** GetSurfaceData: There are 4 coincident/collinear vertices; These have been deleted unless the deletion would bring the number of surface sides < 3.
** ~~~ ** For explicit details on each problem surface, use Output:Diagnostics,DisplayExtraWarnings;
** Warning ** CheckUsedConstructions: There are 5 nominally unused constructions in input.
** ~~~ ** For explicit details on each unused construction, use Output:Diagnostics,DisplayExtraWarnings;
************* Beginning System Sizing Calculations
** Warning ** ManageSizing: For a plant sizing run, there must be at least 1 Sizing:Plant object input. SimulationControl Plant Sizing option ignored.
************* Testing Individual Branch Integrity
************* All Branches passed integrity testing
************* Testing Individual Supply Air Path Integrity
************* All Supply Air Paths passed integrity testing
************* Testing Individual Return Air Path Integrity
************* All Return Air Paths passed integrity testing
************* No node connection errors were found.
************* Beginning Simulation
** Warning ** Coil:Cooling:DX:SingleSpeed "AIR LOOP/SOTANO AHU/1 UNITARY DX COOLING COIL" - Air volume flow rate per watt of rated total cooling capacity is out of range at 1.127E-005 m3/s/W.
** ~~~ ** Environment=AULARIO, at Simulation time=01/01 00:10 - 00:15
** ~~~ ** Expected range for VolumeFlowPerRatedTotalCapacity=[2.684E-005--6.713E-005]
** ~~~ ** Possible causes include inconsistent air flow rates in system components,
** ~~~ ** or variable air volume [VAV] system using incorrect coil type.
** Warning ** Coil:Cooling:DX:SingleSpeed "AIR LOOP/SOTANO AHU/1 UNITARY DX COOLING COIL" - Full load outlet air dry-bulb temperature < 2C. This indicates the possibility of coil frost/freeze. Outlet temperature = -25.14 C.
** ~~~ ** ...Occurrence info = AULARIO, 01/01 00:10 - 00:15
** ~~~ ** ... Possible reasons for low outlet air dry-bulb temperatures are: This DX coil
** ~~~ ** 1) may have a low inlet air dry-bulb temperature. Inlet air temperature = 20.661 C.
** ~~~ ** 2) may have a low air flow rate per watt of cooling capacity. Check inputs.
** ~~~ ** 3) is used as part of a HX assisted cooling coil which uses a high sensible effectiveness. Check inputs.
** Warning ** Enthalpy out of range (PsyTsatFnHPb)
** ~~~ ** Routine=CalcDoe2DXCoil, Environment=AULARIO, at Simulation time=01/01 00:23 - 00:30
** ~~~ ** Enthalpy=-48083.47942 Pressure= 100900.00
** ~~~ ** Initial Resultant Temperature= -59.98
** Warning ** Calculated Humidity Ratio invalid (PsyWFnTdbH)
** ~~~ ** Routine=CalcDoe2DXCoil, Environment=AULARIO, at Simulation time=01/01 00:23 - 00:30
** ~~~ ** Dry-Bulb= -59.98 Enthalpy= -65947.179
** ~~~ ** Calculated Humidity Ratio= -2.3718E-003 ... Humidity Ratio set to .00001
** Warning ** WriteVeriSumTable: InputVerificationsAndResultsSummary: Wall area based on [>=60,<=120] degrees (tilt) as walls
** ~~~ ** differs ~18.3% from user entered Wall class surfaces. Degree calculation based on ASHRAE 90.1 wall definitions.
** ~~~ ** Calculated based on degrees=[8085.092] m2, Calculated from user entered Wall class surfaces=[6833.452] m2.
** ~~~ ** Check classes of surfaces and tilts for discrepancies.
************* Simulation Error Summary *************
** Warning ** The following Report Variables were requested but not generated
** ~~~ ** because IDF did not contain these elements or misspelled variable name -- check .rdd file
************* Key=SOTANO:DEPOSITO, VarName=ZONE MECHANICAL VENTILATION AIR CHANGE RATE, Frequency=Monthly

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Jeremiah Crossett <jcrossett@...> wrote:
>
> The rule is that you must understand the warning and be able to explain it.
> Does not really matter what the warning is, just that you understand why it
> does not matter. The question then is, why is this warning happening and
> why does it not matter? Could you paste the warning into the body of your
> email..?
>
>
> *
> *
> *
> *
> *Jeremiah D. Crossett | Senior Analyst | Phase Change Energy Solutions*

> *
> 120 E. Pritchard St. | Asheboro, NC 27203 | Mobile 503-688-8951
> www.phasechange.com
> *
>
> *
> *
> *
> *
>
>
>
> On Mon, Aug 12, 2013 at 9:11 AM, billysonny1 <bscr_14@...> wrote:
>
> > **

> >
> >
> > Hello dear forum,
> >
> > For LEED EAp2 form, I got over 2 million warning messages and 1 error
> > message recorded in the Error log file, the results say the simulation was
> > completed successfully, though.
> >
> > So, I have two specific questions:
> > 1. Where can I find in the reports the 'Number of defaults overriden'?
> > 2. According to your experience, do you consider that a lot of Warning
> > messages would make the LEED reviewer ask for a clarification?
> >
> > Thanks in advance,
> >
> > Billy Condor.
> >
> >
> >
>