module SmallDataCenterLowITE
Custom changes for the SmallDataCenterLowITE
prototype. These are changes that are inconsistent with other prototype building types.
Public Instance Methods
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
@param model [OpenStudio::Model::Model] OpenStudio model object @return [Boolean] returns true if successful, false if not
# File lib/openstudio-standards/prototypes/common/buildings/Prototype.SmallDataCenterLowITE.rb, line 31 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? it_fan_power_ratio = 0.4 / (1 + 0.4) # assuming IT fan power is 0.4 of total CPU load 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(elec_equip_per_area.to_f, 'W/ft^2', 'W/m^2').get) it_equipment_def.setDesignFanAirFlowRateperPowerInput(0.0001) it_equipment_def.setDesignFanPowerInputFraction(it_fan_power_ratio) it_equipment_def.setDesignEnteringAirTemperature(22.5) # recommended SAT 18-27C, use the middle T as design it_equipment_def.setAirFlowCalculationMethod('FlowControlWithApproachTemperatures') # Set the approach temperatures based on CFD simulation results it_equipment_def.setSupplyTemperatureDifference(10.21) # This is under fully open configuration assumption, based on the lookup table in scorecard it_equipment_def.setReturnTemperatureDifference(-7.04) # This is under fully open configuration assumption, based on the lookup table in scorecard # after the bug in OpenStudio core is fixed, this temperature schedules was enabled it_equipment_def.setSupplyTemperatureDifferenceSchedule(model_add_schedule(model, 'SmallDataCenterLowITE SupplyApproachTemp_SCH')) # This is under fully open configuration assumption, based on the lookup table in scorecard it_equipment_def.setReturnTemperatureDifferenceSchedule(model_add_schedule(model, 'SmallDataCenterLowITE ReturnApproachTemp_SCH')) it_equipment = OpenStudio::Model::ElectricEquipmentITEAirCooled.new(it_equipment_def) it_equipment.setSpaceType(space_type) it_equipment.setName("#{space_type.name} 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) return true end
get CRAC supply air temperature schedule
@param model [OpenStudio::Model::Model] OpenStudio model object @return [OpenStudio::Model::Schedule] supply temperature schedule object
# File lib/openstudio-standards/prototypes/common/buildings/Prototype.SmallDataCenterLowITE.rb, line 93 def get_crac_supply_temp_sch(model) supply_temp_diff_max = 0 supply_temp_diff_sch = nil supply_temp_sch = nil model.getElectricEquipmentITEAirCooledDefinitions.each do |it_equip| # if it_equip.supplyTemperatureDifferenceSchedule.is_initialized # # only if supply temperature difference schedule is defined # supply_temp_diff_sch = it_equip.supplyTemperatureDifferenceSchedule.get # if supply_temp_diff_sch.to_ScheduleRuleset.is_initialized # # use the largest supply approach temperature schedule if multiple IT equips are using different schedules # if OpenstudioStandards::Schedules.schedule_ruleset_get_min_max(supply_temp_diff_sch)['max'] <= supply_temp_diff_max # next # else # supply_temp_diff_max = OpenstudioStandards::Schedules.schedule_ruleset_get_min_max(supply_temp_diff_sch)['max'] # supply_temp_diff_sch = supply_temp_diff_sch.to_ScheduleRuleset.get # supply_temp_sch = supply_temp_diff_sch.clone(model).to_ScheduleRuleset.get # supply_temp_sch.setName('AHU Supply Temp Sch updated') # supply_temp_sch.scheduleRules.each do |rule| # day_rule = rule.daySchedule() # day_rule.times().each do |time| # supply_temp_diff = day_rule.getValue(time) # day_rule.addValue(time, it_equip.designEnteringAirTemperature-supply_temp_diff) # end # end # next # skip supply approach temperature if schedule is defined # end # end # end # Take the supply approach temperature at fully open air management scenario supply_temp_diff_max = it_equip.supplyTemperatureDifference if it_equip.supplyTemperatureDifference > supply_temp_diff_max if supply_temp_diff_max > 0 supply_temp_sch = OpenstudioStandards::Schedules.create_constant_schedule_ruleset(model, it_equip.designEnteringAirTemperature - supply_temp_diff_max, name: 'AHU Supply Temp Sch updated', schedule_type_limit: 'Temperature') end end return supply_temp_sch end
geometry adjustments specific to the prototype model
@param model [OpenStudio::Model::Model] OpenStudio model object @param building_type [String the building type @param climate_zone [String] ASHRAE climate zone, e.g. ‘ASHRAE 169-2013-4A’ @param prototype_input [Hash] hash of prototype inputs @return [Boolean] returns true if successful, false if not
# File lib/openstudio-standards/prototypes/common/buildings/Prototype.SmallDataCenterLowITE.rb, line 152 def model_custom_geometry_tweaks(model, building_type, climate_zone, prototype_input) return true end
hvac adjustments specific to the prototype model
@param model [OpenStudio::Model::Model] OpenStudio model object @param building_type [String the building type @param climate_zone [String] ASHRAE climate zone, e.g. ‘ASHRAE 169-2013-4A’ @param prototype_input [Hash] hash of prototype inputs @return [Boolean] returns true if successful, false if not
# File lib/openstudio-standards/prototypes/common/buildings/Prototype.SmallDataCenterLowITE.rb, line 11 def model_custom_hvac_tweaks(model, building_type, climate_zone, prototype_input) OpenStudio.logFree(OpenStudio::Info, 'openstudio.model.Model', 'Started building type specific adjustments') # add IT equipment (ITE object) for data center building types add_data_center_load(model) # This should be added as a retrofit measure instead of being in the prototype # modify CRAC supply air setpoint manager # modify_crac_sa_stpt_manager(model) OpenStudio.logFree(OpenStudio::Info, 'openstudio.model.Model', 'Finished building type specific adjustments') return true end
swh adjustments specific to the prototype model
@param model [OpenStudio::Model::Model] OpenStudio model object @param building_type [String the building type @param climate_zone [String] ASHRAE climate zone, e.g. ‘ASHRAE 169-2013-4A’ @param prototype_input [Hash] hash of prototype inputs @return [Boolean] returns true if successful, false if not
# File lib/openstudio-standards/prototypes/common/buildings/Prototype.SmallDataCenterLowITE.rb, line 141 def model_custom_swh_tweaks(model, building_type, climate_zone, prototype_input) return true end
modify CRAC supply air setpoint manager
@param model [OpenStudio::Model::Model] OpenStudio model object @return [Boolean] returns true if successful, false if not
# File lib/openstudio-standards/prototypes/common/buildings/Prototype.SmallDataCenterLowITE.rb, line 79 def modify_crac_sa_stpt_manager(model) supply_temp_sch = get_crac_supply_temp_sch(model) model.getSetpointManagerScheduleds.each do |stpt_manager| next unless stpt_manager.name.to_s.downcase == 'crac supply air setpoint manager' stpt_manager.setSchedule(supply_temp_sch) end return true end