Module: ASHRAEPRMCoilDX

Included in:
ASHRAE901PRM
Defined in:
lib/openstudio-standards/standards/ashrae_90_1_prm/ashrae_90_1_prm.CoilDX.rb

Overview

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

CoilDX collapse

Instance Method Details

#coil_dx_find_search_criteria(coil_dx, capacity, sys_type) ⇒ Hash

Finds the search criteria

Parameters:

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

    coil cooling object

  • capacity (Double) —

    capacity in btu/hr

  • sys_type (String) —

    HVAC system type

Returns:

  • (Hash) —

    has for search criteria to be used for find object



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# File 'lib/openstudio-standards/standards/ashrae_90_1_prm/ashrae_90_1_prm.CoilDX.rb', line 81

def coil_dx_find_search_criteria(coil_dx, capacity, sys_type)
  search_criteria = {}
  search_criteria['template'] = template

  search_criteria['cooling_type'] = 'AirCooled'

  # Get the coil_dx_subcategory(coil_dx)
  subcategory = coil_dx_subcategory(coil_dx, capacity, sys_type)
  unless subcategory.nil?
    search_criteria['subcategory'] = subcategory
  end

  if coil_dx.iddObjectType.valueName.to_s != 'OS_Coil_Heating_DX_SingleSpeed'
    search_criteria['heating_type'] = 'Any'
  end

  if sys_type == 'PTAC'
    search_criteria['equipment_type'] = sys_type
  elsif sys_type == 'PTHP'
    search_criteria['equipment_type'] = sys_type
  elsif sys_type == 'PSZ_AC'
    search_criteria['equipment_type'] = 'Air Conditioners'
  elsif sys_type == 'PSZ_HP'
    search_criteria['equipment_type'] = 'Heat Pumps'
  end

  return search_criteria
end

#coil_dx_number_of_systems(coil_dx, sys_type) ⇒ Double

Finds the subcategory.

Parameters:

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

    coil cooling object

  • sys_type (String) —

    HVAC system type

Returns:

  • (Double) —

    the number of systems



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# File 'lib/openstudio-standards/standards/ashrae_90_1_prm/ashrae_90_1_prm.CoilDX.rb', line 38

def coil_dx_number_of_systems(coil_dx, sys_type)
  # default to 1
  multiplier = 1

  # get thermal zone
  thermal_zone = OpenstudioStandards::HVAC.hvac_component_get_thermal_zone(coil_dx)

  if thermal_zone.nil?
    OpenStudio.logFree(OpenStudio::Error, 'prm.log', "Unable to determine thermal zone for coil #{coil_dx.name}.")
    return multiplier
  end

  # use user data multiplier if available
  if standards_data.key?('userdata_thermal_zone')
    standards_data['userdata_thermal_zone'].each do |row|
      next unless row['name'].to_s.downcase.strip == thermal_zone.name.to_s.downcase.strip

      if row['number_of_systems'].to_s.upcase.strip != ''
        mult = row['number_of_systems'].to_s
        if mult.to_i.to_s == mult
          multiplier = mult.to_i
        else
          OpenStudio.logFree(OpenStudio::Error, 'prm.log', 'In userdata_thermalzone, number_of_systems requires integer input.')
        end
        break
      end
    end
  end

  if (sys_type == 'PTAC') || (sys_type == 'PTHP')
    # use zone multiplier
    multiplier = thermal_zone.multiplier
  end

  return multiplier
end

#coil_dx_subcategory(coil_dx, capacity, sys_type) ⇒ String

Finds the subcategory.

Parameters:

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

    coil cooling object

  • capacity (Double) —

    capacity in btu/hr

  • sys_type (String) —

    HVAC system type

Returns:

  • (String) —

    the coil_dx_subcategory(coil_dx)



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# File 'lib/openstudio-standards/standards/ashrae_90_1_prm/ashrae_90_1_prm.CoilDX.rb', line 13

def coil_dx_subcategory(coil_dx, capacity, sys_type)
  sub_category = nil
  if coil_dx.iddObjectType.valueName.to_s.include? 'OS_Coil_Cooling_DX'
    case sys_type
    when 'PTHP'
      sub_category = nil
    when 'PTAC'
      sub_category = nil
    when 'PSZ_HP'
      if capacity < 65000
        sub_category = 'Single Package'
      end
    else
      sub_category = 'Single Package'
    end
  end

  return sub_category
end