Module: SmallDataCenterLowITE

Defined in:
lib/openstudio-standards/prototypes/common/buildings/Prototype.SmallDataCenterLowITE.rb

Overview

Custom changes for the QuickServiceRestaurant prototype. These are changes that are inconsistent with other prototype building types.

Instance Method Summary collapse

Instance Method Details

#add_data_center_load(model) ⇒ Object

add IT equipment (ITE object) for data center building types Normal electric equipment has been added in model_add_load prior to this will replace with ITE object here



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# File 'lib/openstudio-standards/prototypes/common/buildings/Prototype.SmallDataCenterLowITE.rb', line 20

def add_data_center_load(model)

  model.getSpaceTypes.each do |space_type|
    # Get the standards data
    space_type_properties = space_type_get_standards_data(space_type)

    elec_equip_have_info = false
    elec_equip_per_area = space_type_properties['electric_equipment_per_area'].to_f
    elec_equip_sch = space_type_properties['electric_equipment_schedule']
    elec_equip_have_info = true unless elec_equip_per_area.zero?

    # The way ITE object is designed can't input the CPU load and IT fan power separately
    # calculation below is to indirectly address this
    total_power_input_per_area = elec_equip_per_area.to_f * (1 + 0.4)  # assuming IT fan power is 0.4 of total CPU load
    it_fan_power_ratio = elec_equip_per_area.to_f * 0.4/total_power_input_per_area

    if (space_type.name.get.downcase.include?('computer')) || (space_type.name.get.downcase.include?('datacenter'))
      if elec_equip_have_info
        it_equipment_def = OpenStudio::Model::ElectricEquipmentITEAirCooledDefinition.new(model)
        it_equipment_def.setName("IT equipment def")
        it_equipment_def.setWattsperZoneFloorArea(OpenStudio.convert(total_power_input_per_area.to_f, 'W/ft^2', 'W/m^2').get)
        it_equipment_def.setDesignFanAirFlowRateperPowerInput(0.0001*(1-it_fan_power_ratio))
        it_equipment_def.setDesignFanPowerInputFraction(it_fan_power_ratio)
        it_equipment_def.setDesignEnteringAirTemperature(27)    # recommended SAT 18-27C, use the middle T as design
        it_equipment_def.setAirFlowCalculationMethod("FlowControlWithApproachTemperatures")
        # TODO Set the approach temperatures based on CFD simulation results
        it_equipment_def.setSupplyTemperatureDifference(8.9)   # This is under fully open configuration assumption, based on the lookup table in scorecard
        it_equipment_def.setReturnTemperatureDifference(-7.2)   # This is under fully open configuration assumption, based on the lookup table in scorecard

        it_equipment = OpenStudio::Model::ElectricEquipmentITEAirCooled.new(it_equipment_def)
        it_equipment.setSpaceType(space_type)
        it_equipment.setName("#{space_type.name.to_s} IT equipment")
        unless elec_equip_sch.nil?
          it_equipment.setDesignPowerInputSchedule(model_add_schedule(model, elec_equip_sch))
          OpenStudio.logFree(OpenStudio::Info, 'openstudio.standards.SpaceType', "#{space_type.name} set Design Power Input Schedule to #{elec_equip_sch}.")
        end
        it_equipment.setCPULoadingSchedule(model.alwaysOnDiscreteSchedule)

      end
    end
  end
  # remove normal electric equipment
  model.getElectricEquipments.each(&:remove)
end

#model_custom_geometry_tweaks(building_type, climate_zone, prototype_input, model) ⇒ Object 



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# File 'lib/openstudio-standards/prototypes/common/buildings/Prototype.SmallDataCenterLowITE.rb', line 71

def model_custom_geometry_tweaks(building_type, climate_zone, prototype_input, model)

  return true
end

#model_custom_hvac_tweaks(building_type, climate_zone, prototype_input, model) ⇒ Object 



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# File 'lib/openstudio-standards/prototypes/common/buildings/Prototype.SmallDataCenterLowITE.rb', line 6

def model_custom_hvac_tweaks(building_type, climate_zone, prototype_input, model)

  OpenStudio.logFree(OpenStudio::Info, 'openstudio.model.Model', 'Started building type specific adjustments')

  add_data_center_load(model)

  OpenStudio.logFree(OpenStudio::Info, 'openstudio.model.Model', 'Finished building type specific adjustments')

  return true
end

#model_custom_swh_tweaks(model, building_type, climate_zone, prototype_input) ⇒ Object 



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# File 'lib/openstudio-standards/prototypes/common/buildings/Prototype.SmallDataCenterLowITE.rb', line 66

def model_custom_swh_tweaks(model, building_type, climate_zone, prototype_input)

  return true
end