Class: AddRooftopPV

Inherits:
OpenStudio::Measure::ModelMeasure
  • Object
show all
Defined in:
lib/measures/add_rooftop_pv/measure.rb

Overview

start the measure

Instance Method Summary collapse

Instance Method Details

#arguments(model) ⇒ Object

define the arguments that the user will input



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# File 'lib/measures/add_rooftop_pv/measure.rb', line 29

def arguments(model)
  args = OpenStudio::Measure::OSArgumentVector.new

  # set fraction_of_surface
  fraction_of_surface = OpenStudio::Measure::OSArgument.makeDoubleArgument('fraction_of_surface', true)
  fraction_of_surface.setDisplayName('Fraction of Surface Area with Active Solar Cells')
  fraction_of_surface.setUnits('fraction')
  fraction_of_surface.setDefaultValue(0.75)
  args << fraction_of_surface

  # set cell_efficiency
  cell_efficiency = OpenStudio::Measure::OSArgument.makeDoubleArgument('cell_efficiency', true)
  cell_efficiency.setDisplayName('Cell Efficiency')
  cell_efficiency.setUnits('fraction')
  cell_efficiency.setDefaultValue(0.18)
  args << cell_efficiency

  # set inverter_efficiency
  inverter_efficiency = OpenStudio::Measure::OSArgument.makeDoubleArgument('inverter_efficiency', true)
  inverter_efficiency.setDisplayName('Inverter Efficiency')
  inverter_efficiency.setUnits('fraction')
  inverter_efficiency.setDefaultValue(0.98)
  args << inverter_efficiency

  # TODO: = add in min and max azimuth arguments, think about how I want to handle flat roofs.

  return args
end

#description ⇒ Object

human readable description



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# File 'lib/measures/add_rooftop_pv/measure.rb', line 19

def description
  return 'This measure will create new shading surface geometry above the roof for each thermal zone inyour model where the surface azmith falls within the user specified range. Arguments are exposed for panel efficiency, inverter efficiency, and the fraction of each roof surface that has PV.'
end

#modeler_description ⇒ Object

human readable description of modeling approach



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# File 'lib/measures/add_rooftop_pv/measure.rb', line 24

def modeler_description
  return 'The fraction of surface containing PV will not only set the PV properties, but will also change the transmittance value for the shading surface. This allows the measure to avoid attempting to layout the panels. Simple PV will be used to model the PV.'
end

#name ⇒ Object

human readable name



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# File 'lib/measures/add_rooftop_pv/measure.rb', line 14

def name
  return 'Add Rooftop PV'
end

#run(model, runner, user_arguments) ⇒ Object

define what happens when the measure is run



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# File 'lib/measures/add_rooftop_pv/measure.rb', line 59

def run(model, runner, user_arguments)
  super(model, runner, user_arguments)

  # use the built-in error checking
  if !runner.validateUserArguments(arguments(model), user_arguments)
    return false
  end

  # assign the user inputs to variables
  args = runner.getArgumentValues(arguments(model), user_arguments)
  args = Hash[args.collect{ |k, v| [k.to_s, v] }]
  if !args then return false end

  # check expected values of double arguments
  # todo - not sure why this isn't working. Elsewhere it is used on E+ and reporting measures.
  # todo - maybe related is this error on test 'Asked to create a flat json serialization of a vector of attributes with non-unique names'
  # fraction_check = OsLib_HelperMethods.checkDoubleAndIntegerArguments(runner, user_arguments,{"min"=>0.0,"max"=>1.0,"min_eq_bool"=>true,"max_eq_bool"=>true,"arg_array" =>["fraction_of_surface","cell_efficiency","inverter_efficiency"]})
  # if !fraction_check then return false end

  # report initial condition of model
  runner.registerInitialCondition("The building started with #{model.getShadingSurfaces.size} shading surfaces.")

  # create copies of exterior roofs has shading surfaces 12 inches above teh roof. Maybe the height should become an argument.
  vertical_offset_ip = 1.0 # feet
  vertical_offset_si = OpenStudio.convert(vertical_offset_ip, 'ft', 'm').get

  # create the inverter
  inverter = OpenStudio::Model::ElectricLoadCenterInverterSimple.new(model)
  inverter.setInverterEfficiency(args['inverter_efficiency'])
  runner.registerInfo("Created inverter with efficiency of #{inverter.inverterEfficiency}")

  # create the distribution system
  elcd = OpenStudio::Model::ElectricLoadCenterDistribution.new(model)
  elcd.setInverter(inverter)

  # create shared shading transmittance schedule
  target_transmittance = 1.0 - args['fraction_of_surface'].to_f
  inputs = {
    'name' => 'PV Shading Transmittance Schedule',
    'winterTimeValuePairs' => { 24.0 => target_transmittance },
    'summerTimeValuePairs' => { 24.0 => target_transmittance },
    'defaultTimeValuePairs' => { 24.0 => target_transmittance }
  }
  pv_shading_transmittance_schedule = OpenstudioStandards::Schedules.create_simple_schedule(model, inputs)
  runner.registerInfo("Created transmittance schedule for PV shading surfaces with constant value of #{target_transmittance}")

  model.getSurfaces.each do |surface|
    next if !surface.space.is_initialized
    if (surface.surfaceType == 'RoofCeiling') && (surface.outsideBoundaryCondition == 'Outdoors')

      # store  vertices
      vertices = surface.vertices
      origin = [surface.space.get.xOrigin, surface.space.get.yOrigin, surface.space.get.zOrigin]

      # make shading surface group and set origin
      shading_surface_group = OpenStudio::Model::ShadingSurfaceGroup.new(model)
      shading_surface_group.setXOrigin(origin[0])
      shading_surface_group.setYOrigin(origin[1])
      shading_surface_group.setZOrigin(origin[2] + vertical_offset_si)

      # make shading surface for new group
      shading_surface = OpenStudio::Model::ShadingSurface.new(vertices, model)
      shading_surface.setShadingSurfaceGroup(shading_surface_group)
      shading_surface.setName("PV - #{surface.name}")
      shading_surface.setTransmittanceSchedule(pv_shading_transmittance_schedule)

      # create the panel
      panel = OpenStudio::Model::GeneratorPhotovoltaic.simple(model)
      panel.setSurface(shading_surface)
      performance = panel.photovoltaicPerformance.to_PhotovoltaicPerformanceSimple.get
      performance.setFractionOfSurfaceAreaWithActiveSolarCells(args['fraction_of_surface'])
      performance.setFixedEfficiency(args['cell_efficiency'])

      # connect panel to electric load center distribution
      elcd.addGenerator(panel)

      runner.registerInfo("Created shading surface for PV over #{surface.name} with a cell efficiency of #{performance.fixedEfficiency} and surface coverage fraction of #{performance.fractionOfSurfaceAreaWithActiveSolarCells}")

    end
  end

  # report final condition of model
  runner.registerFinalCondition("The building finished with #{model.getShadingSurfaces.size} shading surfaces.")

  return true
end