Constant boundary condition

asked 2017-08-25 23:38:29 -0500

Geraldo Pithon

1278 ●5 ●22 http://www.termind.com.br/

updated 2017-10-09 08:03:50 -0500

__AmirRoth__

4436 ●5 ●17 http://bleedinggreenna...

How can I set a constant boundary condition in a surface?

I already search in EnergyPlus manual and this function would be set Outside Boundary Condition to Other Side Coefficients and use the constants to set the boundary. Althought, when I try to set OtherSideCoefficients in OpenStudio, it is not possible.

Beyond that, I don't know how to set all parameters of OtherSideCoefficients only using the field Outside Boundary Condition Object. image description

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answered 2017-08-28 03:17:57 -0500

Julien Marrec

29042 ●85 ●74 http://www.effibem.com/

updated 2017-08-28 03:18:38 -0500

You can use the API to do so, using SurfacePropertyOtherSideCoefficients.

Here's the second example from the I/O reference guide here

model = OpenStudio::Model::Model.new

sprop = OpenStudio::Model::SurfacePropertyOtherSideCoefficients.new(model)
sprop.setName("OSCCoef:Zn005:Wall004")
sprop.setCombinedConvectiveRadiativeFilmCoefficient(1.23)
sprop.constantTemperature
sprop.constantTemperatureCoefficient
sprop.setConstantTemperature(0)
sprop.setConstantTemperatureCoefficient(0)
sprop.setExternalDryBulbTemperatureCoefficient(1)
sprop.setGroundTemperatureCoefficient(0)
sprop.setZoneAirTemperatureCoefficient(0)
sprop.sinusoidalVariationofConstantTemperatureCoefficient
sprop.setSinusoidalVariationofConstantTemperatureCoefficient(false)
sprop.setPeriodofSinusoidalVariation(24)
sprop.previousOtherSideTemperatureCoefficient(0)
sprop.setPreviousOtherSideTemperatureCoefficient(0)
sprop.resetMinimumOtherSideTemperatureLimit
sprop.resetMaximumOtherSideTemperatureLimit
puts sprop

Out:

OS:SurfaceProperty:OtherSideCoefficients,
  {0080fb86-3998-4681-ae5c-908610b02e6b}, !- Handle
  OSCCoef:Zn005:Wall004, !- Name
  1.23,                                   !- Combined Convective/Radiative Film Coefficient {W/m2-K}
  0,                                      !- Constant Temperature {C}
  0,                                      !- Constant Temperature Coefficient
  1,                                      !- External Dry-Bulb Temperature Coefficient
  0,                                      !- Ground Temperature Coefficient
  ,                                       !- Wind Speed Coefficient
  0,                                      !- Zone Air Temperature Coefficient
  ,                                       !- Constant Temperature Schedule Name
  No,                                     !- Sinusoidal Variation of Constant Temperature Coefficient
  24,                                     !- Period of Sinusoidal Variation {hr}
  0,                                      !- Previous Other Side Temperature Coefficient
  ,                                       !- Minimum Other Side Temperature Limit {C}
  ;                                       !- Maximum Other Side Temperature Limit {C}

If s is an OpenStudio::Model::Surface, to set the property:

s.setSurfacePropertyOtherSideCoefficients(sprop)

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Thank's @Julien Marrec. Can you help me with some manual about using API? Where do I write this code? I don't know anything about this and the material in OpenStudio Documentation seems me something too advanced. There is something basic for beginners?

Geraldo Pithon ( 2017-08-28 09:13:42 -0500 )edit

I guess the measure writing guide is the right place to start (personally I'd tend to write this directly into a terminal rather than spend time writing an actual measure, but that might be even more confusing for a new user).