Module: CoilDX

Included in:
Standard
Defined in:
lib/openstudio-standards/standards/Standards.CoilDX.rb

Overview

A variety of DX coil methods that are the same regardless of coil type. These methods are available to: CoilCoolingDXSingleSpeed, CoilCoolingDXTwoSpeed, CoilCoolingDXMultiSpeed

CoilDX collapse

Instance Method Details

#coil_dx_cap_fflow(coil_dx, equipment_type = 'Air Conditioners', heating = false) ⇒ String

Determine what capacity curve to use to represent the change of the coil’s capacity as a function of changes in airflow fraction

Parameters:

  • coil_dx (OpenStudio::Model::StraightComponent) —

    coil cooling object, allowable types: CoilCoolingDXSingleSpeed, CoilCoolingDXTwoSpeed, CoilCoolingDXMultiSpeed

  • equipment_type (String) (defaults to: 'Air Conditioners') —

    Type of equipment

  • heating (Boolean) (defaults to: false) —

    Specify if the curve to return is for heating operation

Returns:



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# File 'lib/openstudio-standards/standards/Standards.CoilDX.rb', line 274

def coil_dx_cap_fflow(coil_dx, equipment_type = 'Air Conditioners', heating = false)
  case equipment_type
  when 'PTAC'
    return 'DX Coil Cap-FF'
  when 'PSZ-AC', 'Air Conditioners'
    return 'CoilClgDXSnglQRatio_fCFMRatio'
  when 'PTHP'
    return 'DXHEAT-NECB2011-REF-CAPFFLOW'
  when 'PSZ-HP', 'Heat Pumps'
    return 'HPACHeatCapFFF' if heating

    return 'HPACCoolCapFFF'
  else
    return 'CoilClgDXSnglQRatio_fCFMRatio'
  end
end

#coil_dx_cap_ft(coil_dx, equipment_type = 'Air Conditioners', heating = false) ⇒ String

Determine what capacity curve to use to represent the change of the coil’s capacity as a function of changes in temperatures

Parameters:

  • coil_dx (OpenStudio::Model::StraightComponent) —

    coil cooling object, allowable types: CoilCoolingDXSingleSpeed, CoilCoolingDXTwoSpeed, CoilCoolingDXMultiSpeed

  • equipment_type (String) (defaults to: 'Air Conditioners') —

    Type of equipment

  • heating (Boolean) (defaults to: false) —

    Specify if the curve to return is for heating operation

Returns:



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# File 'lib/openstudio-standards/standards/Standards.CoilDX.rb', line 250

def coil_dx_cap_ft(coil_dx, equipment_type = 'Air Conditioners', heating = false)
  case equipment_type
  when 'PTAC'
    return 'PSZ-Fine Storage DX Coil Cap-FT'
  when 'PSZ-AC', 'Air Conditioners'
    return 'CoilClgDXQRatio_fTwbToadbSI'
  when 'PTHP'
    return 'DXHEAT-NECB2011-REF-CAPFT'
  when 'PSZ-HP', 'Heat Pumps'
    return 'HPACHeatCapFT' if heating

    return 'HPACCoolCapFT'
  else
    return 'CoilClgDXQRatio_fTwbToadbSI'
  end
end

#coil_dx_eir_fflow(coil_dx, equipment_type = 'Air Conditioners', heating = false) ⇒ String

Determine what EIR curve to use to represent the change of the coil’s EIR as a function of changes in airflow fraction

Parameters:

  • coil_dx (OpenStudio::Model::StraightComponent) —

    coil cooling object, allowable types: CoilCoolingDXSingleSpeed, CoilCoolingDXTwoSpeed, CoilCoolingDXMultiSpeed

  • equipment_type (String) (defaults to: 'Air Conditioners') —

    Type of equipment

  • heating (Boolean) (defaults to: false) —

    Specify if the curve to return is for heating operation

Returns:



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# File 'lib/openstudio-standards/standards/Standards.CoilDX.rb', line 322

def coil_dx_eir_fflow(coil_dx, equipment_type = 'Air Conditioners', heating = false)
  case equipment_type
  when 'PTAC'
    return 'Split DX Coil EIR-FF'
  when 'PSZ-AC', 'Air Conditioners'
    return 'CoilClgDXSnglEIRRatio_fCFMRatio'
  when 'PTHP'
    return 'DXHEAT-NECB2011-REF-EIRFFLOW'
  when 'PSZ-HP', 'Heat Pumps'
    return 'HPACHeatEIRFFF' if heating

    return 'HPACCoolEIRFFF'
  else
    return 'CoilClgDXSnglEIRRatio_fCFMRatio'
  end
end

#coil_dx_eir_ft(coil_dx, equipment_type = 'Air Conditioners', heating = false) ⇒ String

Determine what EIR curve to use to represent the change of the coil’s EIR as a function of changes in temperatures

Parameters:

  • coil_dx (OpenStudio::Model::StraightComponent) —

    coil cooling object, allowable types: CoilCoolingDXSingleSpeed, CoilCoolingDXTwoSpeed, CoilCoolingDXMultiSpeed

  • equipment_type (String) (defaults to: 'Air Conditioners') —

    Type of equipment

  • heating (Boolean) (defaults to: false) —

    Specify if the curve to return is for heating operation

Returns:



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# File 'lib/openstudio-standards/standards/Standards.CoilDX.rb', line 298

def coil_dx_eir_ft(coil_dx, equipment_type = 'Air Conditioners', heating = false)
  case equipment_type
  when 'PTAC'
    return 'PSZ-AC DX Coil EIR-FT'
  when 'PSZ-AC', 'Air Conditioners'
    return 'CoilClgDXEIRRatio_fTwbToadbSI'
  when 'PTHP'
    return 'DXHEAT-NECB2011-REF-EIRFT'
  when 'PSZ-HP', 'Heat Pumps'
    return 'HPACHeatEIRFT' if heating

    return 'HPACCoolEIRFT'
  else
    return 'CoilClgDXEIRRatio_fTwbToadbSI'
  end
end

#coil_dx_electric_power_phase(coil_dx) ⇒ String

Determine what electric power phase value should be used for efficiency lookups for DX coils

Parameters:

  • coil_dx (OpenStudio::Model::StraightComponent) —

    coil cooling object, allowable types: CoilCoolingDXSingleSpeed, CoilCoolingDXTwoSpeed, CoilCoolingDXMultiSpeed

Returns:

  • (String) —

    Electric power phase



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# File 'lib/openstudio-standards/standards/Standards.CoilDX.rb', line 234

def coil_dx_electric_power_phase(coil_dx)
  case template
  when '90.1-2019', '90.1-2016'
    return 3
  else
    return nil
  end
end

#coil_dx_find_search_criteria(coil_dx, necb_ref_hp = false, equipment_type = false) ⇒ Hash

Finds the search criteria

Parameters:

  • coil_dx (OpenStudio::Model::StraightComponent) —

    coil cooling object, allowable types: CoilCoolingDXSingleSpeed, CoilCoolingDXTwoSpeed, CoilCoolingDXMultiSpeed

  • necb_ref_hp (Boolean) (defaults to: false) —

    for compatability with NECB ruleset only.

  • equipment_type (Boolean) (defaults to: false) —

    indicate that equipment_type should be in the search criteria.

Returns:

  • (Hash) —

    has for search criteria to be used for find object



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# File 'lib/openstudio-standards/standards/Standards.CoilDX.rb', line 160

def coil_dx_find_search_criteria(coil_dx, necb_ref_hp = false, equipment_type = false)
  search_criteria = {}
  search_criteria['template'] = template

  # Cooling type
  search_criteria['cooling_type'] = case coil_dx.iddObjectType.valueName.to_s
                                    when 'OS_Coil_Cooling_DX_SingleSpeed',
                                         'OS_Coil_Cooling_DX_TwoSpeed',
                                         'OS_Coil_Cooling_DX_VariableSpeed',
                                         'OS_Coil_Cooling_DX_MultiSpeed',
                                         'OS_AirConditioner_VariableRefrigerantFlow'
                                      coil_dx.condenserType
                                    else
                                      'AirCooled'
                                    end

  # Subcategory
  search_criteria['subcategory'] = coil_dx_subcategory(coil_dx)

  # Add the heating type to the search criteria
  case coil_dx.iddObjectType.valueName.to_s
  when 'OS_Coil_Cooling_DX_SingleSpeed',
       'OS_Coil_Cooling_DX_TwoSpeed',
       'OS_Coil_Cooling_DX_VariableSpeed',
       'OS_Coil_Cooling_DX_MultiSpeed',
       'OS_AirConditioner_VariableRefrigerantFlow'
    htg_type = coil_dx_heating_type(coil_dx, necb_ref_hp)
    unless htg_type.nil?
      search_criteria['heating_type'] = htg_type
    end
  end

  # Get the equipment type
  if equipment_type && coil_dx.airLoopHVAC.empty? && coil_dx.containingZoneHVACComponent.is_initialized
    containing_comp = coil_dx.containingZoneHVACComponent.get
    # PTAC
    if containing_comp.to_ZoneHVACPackagedTerminalAirConditioner.is_initialized
      search_criteria['equipment_type'] = 'PTAC'
      search_criteria['subcategory'] = nil
      unless (template == 'NECB2011') || (template == 'NECB2015') || (template == 'NECB2017') || (template == 'NECB2020') || (template == 'BTAPPRE1980') ||
             (template == 'BTAP1980TO2010')
        search_criteria['heating_type'] = nil
      end
    end
    # PTHP
    if containing_comp.to_ZoneHVACPackagedTerminalHeatPump.is_initialized && !((template == 'NECB2011') || (template == 'NECB2015') || (template == 'NECB2017') || (template == 'NECB2020') || (template == 'BTAPPRE1980') ||
             (template == 'BTAP1980TO2010'))
      search_criteria['subcategory'] = nil
      search_criteria['heating_type'] = nil
      search_criteria['equipment_type'] = 'PTHP'
    end
  end

  return search_criteria
end

#coil_dx_heat_pump?(coil_dx) ⇒ Boolean

Determine if it is a heat pump

Parameters:

  • coil_dx (OpenStudio::Model::StraightComponent) —

    coil cooling object

Returns:

  • (Boolean) —

    returns true if it is a heat pump, false if not



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# File 'lib/openstudio-standards/standards/Standards.CoilDX.rb', line 36

def coil_dx_heat_pump?(coil_dx)
  heat_pump = false

  if coil_dx.airLoopHVAC.empty?
    if coil_dx.containingHVACComponent.is_initialized
      containing_comp = coil_dx.containingHVACComponent.get
      if containing_comp.to_AirLoopHVACUnitaryHeatPumpAirToAir.is_initialized
        heat_pump = true
      elsif containing_comp.to_AirLoopHVACUnitaryHeatPumpAirToAirMultiSpeed.is_initialized
        htg_coil = containing_comp.to_AirLoopHVACUnitaryHeatPumpAirToAirMultiSpeed.get.heatingCoil
        if htg_coil.to_CoilHeatingDXMultiSpeed.is_initialized then heat_pump = true end
      end
    elsif coil_dx.containingZoneHVACComponent.is_initialized
      containing_comp = coil_dx.containingZoneHVACComponent.get
      # PTHP
      if containing_comp.to_ZoneHVACPackagedTerminalHeatPump.is_initialized
        heat_pump = true
      end
      # @todo Add other zone hvac systems
    end
  else
    if !coil_dx.airLoopHVAC.get.supplyComponents('OS:Coil:Heating:DX:SingleSpeed'.to_IddObjectType).empty? ||
       !coil_dx.airLoopHVAC.get.supplyComponents('OS:Coil:Heating:DX:VariableSpeed'.to_IddObjectType).empty?
      heat_pump = true
    end
  end

  return heat_pump
end

#coil_dx_heating_type(coil_dx, necb_ref_hp = false) ⇒ String

Determine the heating type. Possible choices are: Electric Resistance or None, All Other

Parameters:

  • coil_dx (OpenStudio::Model::StraightComponent) —

    coil cooling object, allowable types: CoilCoolingDXSingleSpeed, CoilCoolingDXTwoSpeed, CoilCoolingDXMultiSpeed

  • necb_ref_hp (Boolean) (defaults to: false) —

    for compatability with NECB ruleset only.

Returns:

  • (String) —

    the heating type



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# File 'lib/openstudio-standards/standards/Standards.CoilDX.rb', line 73

def coil_dx_heating_type(coil_dx, necb_ref_hp = false)
  htg_type = nil

  # If Unitary or Zone HVAC (could be a unitary system on an air loop)
  if coil_dx.airLoopHVAC.empty?
    if coil_dx.containingHVACComponent.is_initialized
      containing_comp = coil_dx.containingHVACComponent.get
      if containing_comp.to_AirLoopHVACUnitaryHeatPumpAirToAir.is_initialized
        htg_type = 'Electric Resistance or None'
      elsif containing_comp.to_AirLoopHVACUnitarySystem.is_initialized
        htg_coil = containing_comp.to_AirLoopHVACUnitarySystem.get.heatingCoil
        if containing_comp.name.to_s.include? 'Minisplit'
          htg_type = 'All Other'
        elsif htg_coil.is_initialized
          htg_coil = htg_coil.get
          if htg_coil.to_CoilHeatingElectric.is_initialized || htg_coil.to_CoilHeatingDXMultiSpeed.is_initialized
            htg_type = 'Electric Resistance or None'
          elsif htg_coil.to_CoilHeatingGas.is_initialized || htg_coil.to_CoilHeatingGasMultiStage.is_initialized || htg_coil.to_CoilHeatingWater.is_initialized
            htg_type = 'All Other'
          end
        else
          htg_type = 'Electric Resistance or None'
        end
      elsif containing_comp.to_AirLoopHVACUnitaryHeatPumpAirToAirMultiSpeed.is_initialized
        htg_coil = containing_comp.to_AirLoopHVACUnitaryHeatPumpAirToAirMultiSpeed.get.heatingCoil
        supp_htg_coil = containing_comp.to_AirLoopHVACUnitaryHeatPumpAirToAirMultiSpeed.get.supplementalHeatingCoil
        if htg_coil.to_CoilHeatingDXMultiSpeed.is_initialized || supp_htg_coil.to_CoilHeatingElectric.is_initialized
          htg_type = 'Electric Resistance or None'
        elsif htg_coil.to_CoilHeatingGas.is_initialized || htg_coil.to_CoilHeatingGasMultiStage.is_initialized || htg_coil.to_CoilHeatingWater.is_initialized
          htg_type = 'All Other'
        end
      end
      # @todo Add other unitary systems
    elsif coil_dx.containingZoneHVACComponent.is_initialized
      containing_comp = coil_dx.containingZoneHVACComponent.get
      # PTAC
      if containing_comp.to_ZoneHVACPackagedTerminalAirConditioner.is_initialized
        htg_coil = containing_comp.to_ZoneHVACPackagedTerminalAirConditioner.get.heatingCoil
        if htg_coil.to_CoilHeatingElectric.is_initialized
          htg_type = 'Electric Resistance or None'
        elsif htg_coil.to_CoilHeatingGas.is_initialized || htg_coil.to_CoilHeatingGasMultiStage.is_initialized || htg_coil.to_CoilHeatingWater.is_initialized
          htg_type = 'All Other'
        end
      # PTHP
      elsif containing_comp.to_ZoneHVACPackagedTerminalHeatPump.is_initialized
        htg_type = 'Electric Resistance or None'
      end
      # @todo Add other zone hvac systems
    end
  end

  # If on an AirLoop
  if coil_dx.airLoopHVAC.is_initialized
    air_loop = coil_dx.airLoopHVAC.get
    htg_type = if !air_loop.supplyComponents('OS:Coil:Heating:Gas'.to_IddObjectType).empty?
                 'All Other'
               elsif !air_loop.supplyComponents('OS:Coil:Heating:Water'.to_IddObjectType).empty?
                 'All Other'
               elsif !air_loop.supplyComponents('OS:Coil:Heating:DX:SingleSpeed'.to_IddObjectType).empty?
                 'All Other'
               elsif !air_loop.supplyComponents('OS:Coil:Heating:DX:MultiSpeed'.to_IddObjectType).empty?
                 'All Other'
               elsif !air_loop.supplyComponents('OS:Coil:Heating:DX:VariableSpeed'.to_IddObjectType).empty?
                 'All Other'
               elsif !air_loop.supplyComponents('OS:Coil:Heating:Gas:MultiStage'.to_IddObjectType).empty?
                 'All Other'
               elsif !air_loop.supplyComponents('OS:Coil:Heating:Desuperheater'.to_IddObjectType).empty?
                 'All Other'
               elsif !air_loop.supplyComponents('OS:Coil:Heating:WaterToAirHeatPump:EquationFit'.to_IddObjectType).empty?
                 'All Other'
               elsif !air_loop.supplyComponents('OS:Coil:Heating:Electric'.to_IddObjectType).empty?
                 'Electric Resistance or None'
               else
                 'Electric Resistance or None'
               end
  end

  return htg_type
end

#coil_dx_packaged_terminal_application(coil_dx) ⇒ String

Determine what application to use for looking up the minimum efficiency requirements of PTACs

Parameters:

  • coil_dx (OpenStudio::Model::StraightComponent) —

    coil cooling object, allowable types: CoilCoolingDXSingleSpeed, CoilCoolingDXTwoSpeed, CoilCoolingDXMultiSpeed

Returns:

  • (String) —

    PTAC application



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# File 'lib/openstudio-standards/standards/Standards.CoilDX.rb', line 221

def coil_dx_packaged_terminal_application(coil_dx)
  if template.include?('90.1-2004') || template.include?('90.1-2007')
    return 'New Construction'
  else # '90.1-2010', '90.1-2013', '90.1-2016', '90.1-2019', others
    return 'Standard Size'
  end
end

#coil_dx_plf_fplr(coil_dx, equipment_type = 'Air Conditioners', heating = false) ⇒ String

Determine what PLF curve to use to represent the change of the coil’s PLR as a function of changes in PLR

Parameters:

  • coil_dx (OpenStudio::Model::StraightComponent) —

    coil cooling object, allowable types: CoilCoolingDXSingleSpeed, CoilCoolingDXTwoSpeed, CoilCoolingDXMultiSpeed

  • equipment_type (String) (defaults to: 'Air Conditioners') —

    Type of equipment

  • heating (Boolean) (defaults to: false) —

    Specify if the curve to return is for heating operation

Returns:



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# File 'lib/openstudio-standards/standards/Standards.CoilDX.rb', line 346

def coil_dx_plf_fplr(coil_dx, equipment_type = 'Air Conditioners', heating = false)
  case equipment_type
  when 'PTAC'
    return 'HPACCOOLPLFFPLR'
  when 'PSZ-AC', 'Air Conditioners'
    return 'CoilClgDXEIRRatio_fQFrac'
  when 'PTHP'
    return 'DXHEAT-NECB2011-REF-PLFFPLR'
  when 'PSZ-HP', 'Heat Pumps'
    return 'HPACCOOLPLFFPLR'
  else
    return 'CoilClgDXEIRRatio_fQFrac'
  end
end

#coil_dx_subcategory(coil_dx) ⇒ String

TODO:

Add add split system vs single package to model object

Finds the subcategory. Possible choices are: Single Package, Split System, PTAC, or PTHP

Parameters:

  • coil_dx (OpenStudio::Model::StraightComponent) —

    coil cooling object, allowable types: CoilCoolingDXSingleSpeed, CoilCoolingDXTwoSpeed, CoilCoolingDXMultiSpeed

Returns:

  • (String) —

    the coil_dx_subcategory(coil_dx)



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# File 'lib/openstudio-standards/standards/Standards.CoilDX.rb', line 14

def coil_dx_subcategory(coil_dx)
  sub_category = 'Single Package'

  # Fallback to the name, mainly for library export
  if coil_dx.name.get.to_s.include?('Single Package')
    sub_category = 'Single Package'
  elsif coil_dx.name.get.to_s.include?('Split System') ||
        coil_dx.name.get.to_s.include?('Central Air Source HP')
    sub_category = 'Split System'
  elsif coil_dx.name.get.to_s.include?('Minisplit HP')
    sub_category = 'Minisplit System'
  elsif coil_dx.name.get.to_s.include?('CRAC')
    sub_category = 'CRAC'
  end

  return sub_category
end