class Standard # @!group FanVariableVolume include PrototypeFan # Sets the fan pressure rise based on the Prototype buildings inputs # which are governed by the flow rate coming through the fan # and whether the fan lives inside a unit heater, PTAC, etc. # # @param fan_variable_volume [OpenStudio::Model::FanVariableVolume] variable volume fan object # @return [Boolean] returns true if successful, false if not def fan_variable_volume_apply_prototype_fan_pressure_rise(fan_variable_volume) # Get the max flow rate from the fan. maximum_flow_rate_m3_per_s = nil if fan_variable_volume.maximumFlowRate.is_initialized maximum_flow_rate_m3_per_s = fan_variable_volume.maximumFlowRate.get elsif fan_variable_volume.autosizedMaximumFlowRate.is_initialized maximum_flow_rate_m3_per_s = fan_variable_volume.autosizedMaximumFlowRate.get else OpenStudio.logFree(OpenStudio::Warn, 'openstudio.prototype.FanVariableVolume', "For #{fan_variable_volume.name} max flow rate is not available, cannot apply prototype assumptions.") return false end # Convert max flow rate to cfm maximum_flow_rate_cfm = OpenStudio.convert(maximum_flow_rate_m3_per_s, 'm^3/s', 'cfm').get # Pressure rise will be determined based on the # following logic. pressure_rise_in_h2o = 0.0 # If the fan lives inside of a zone hvac equipment if fan_variable_volume.containingZoneHVACComponent.is_initialized zone_hvac = fan_variable_volume.ZoneHVACComponent.get if zone_hvac.to_ZoneHVACPackagedTerminalAirConditioner.is_initialized pressure_rise_in_h2o = 1.33 elsif zone_hvac.to_ZoneHVACFourPipeFanCoil.is_initialized pressure_rise_in_h2o = 1.33 elsif zone_hvac.to_ZoneHVACUnitHeater.is_initialized pressure_rise_in_h2o = 0.2 else # This type of fan should not exist in the prototype models return false end # If the fan lives on an airloop elsif fan_variable_volume.airLoopHVAC.is_initialized pressure_rise_in_h2o = fan_variable_volume_airloop_fan_pressure_rise(fan_variable_volume) end # Set the fan pressure rise pressure_rise_pa = OpenStudio.convert(pressure_rise_in_h2o, 'inH_{2}O', 'Pa').get fan_variable_volume.setPressureRise(pressure_rise_pa) OpenStudio.logFree(OpenStudio::Info, 'openstudio.model.FanVariableVolume', "For Prototype: #{fan_variable_volume.name}: #{maximum_flow_rate_cfm.round}cfm; Pressure Rise = #{pressure_rise_in_h2o}in w.c.") return true end # Determine the prototype fan pressure rise for a variable volume fan on an AirLoopHVAC based on system airflow. # Defaults to the logic from ASHRAE 90.1-2004 prototypes. # # @param fan_variable_volume [OpenStudio::Model::FanVariableVolume] variable volume fan object # @return [Double] pressure rise in inches H20 def fan_variable_volume_airloop_fan_pressure_rise(fan_variable_volume) # Get the max flow rate from the fan. maximum_flow_rate_m3_per_s = nil if fan_variable_volume.maximumFlowRate.is_initialized maximum_flow_rate_m3_per_s = fan_variable_volume.maximumFlowRate.get elsif fan_variable_volume.autosizedMaximumFlowRate.is_initialized maximum_flow_rate_m3_per_s = fan_variable_volume.autosizedMaximumFlowRate.get else OpenStudio.logFree(OpenStudio::Warn, 'openstudio.prototype.FanVariableVolume', "For #{fan_variable_volume.name} max flow rate is not available, cannot apply prototype assumptions.") return false end # Convert max flow rate to cfm maximum_flow_rate_cfm = OpenStudio.convert(maximum_flow_rate_m3_per_s, 'm^3/s', 'cfm').get # Determine the pressure rise pressure_rise_in_h2o = if maximum_flow_rate_cfm < 4648 4.0 elsif maximum_flow_rate_cfm >= 4648 && maximum_flow_rate_cfm < 20_000 6.32 else # Over 20,000 cfm 5.58 end return pressure_rise_in_h2o end # creates a variable volume fan # # @param model [OpenStudio::Model::Model] OpenStudio model object # @param fan_name [String] fan name # @param fan_efficiency [Double] fan efficiency # @param pressure_rise [Double] fan pressure rise in Pa # @param motor_efficiency [Double] fan motor efficiency # @param motor_in_airstream_fraction [Double] fraction of motor heat in airstream # @param fan_power_minimum_flow_rate_input_method [String] options are Fraction, FixedFlowRate # @param fan_power_minimum_flow_rate_fraction [Double] minimum flow rate fraction # @param end_use_subcategory [String] end use subcategory name # @param fan_power_coefficient_1 [Double] fan power coefficient 1 # @param fan_power_coefficient_2 [Double] fan power coefficient 2 # @param fan_power_coefficient_3 [Double] fan power coefficient 3 # @param fan_power_coefficient_4 [Double] fan power coefficient 4 # @param fan_power_coefficient_5 [Double] fan power coefficient 5 # @return [OpenStudio::Model::FanVariableVolume] variable volume fan object def create_fan_variable_volume(model, fan_name: nil, fan_efficiency: nil, pressure_rise: nil, motor_efficiency: nil, motor_in_airstream_fraction: nil, fan_power_minimum_flow_rate_input_method: nil, fan_power_minimum_flow_rate_fraction: nil, fan_power_coefficient_1: nil, fan_power_coefficient_2: nil, fan_power_coefficient_3: nil, fan_power_coefficient_4: nil, fan_power_coefficient_5: nil, end_use_subcategory: nil) fan = OpenStudio::Model::FanVariableVolume.new(model) PrototypeFan.apply_base_fan_variables(fan, fan_name: fan_name, fan_efficiency: fan_efficiency, pressure_rise: pressure_rise, end_use_subcategory: end_use_subcategory) fan.setMotorEfficiency(motor_efficiency) unless motor_efficiency.nil? fan.setMotorInAirstreamFraction(motor_in_airstream_fraction) unless motor_in_airstream_fraction.nil? fan.setFanPowerMinimumFlowRateInputMethod(fan_power_minimum_flow_rate_input_method) unless fan_power_minimum_flow_rate_input_method.nil? fan.setFanPowerMinimumFlowFraction(fan_power_minimum_flow_rate_fraction) unless fan_power_minimum_flow_rate_fraction.nil? fan.setFanPowerCoefficient1(fan_power_coefficient_1) unless fan_power_coefficient_1.nil? fan.setFanPowerCoefficient2(fan_power_coefficient_2) unless fan_power_coefficient_2.nil? fan.setFanPowerCoefficient3(fan_power_coefficient_3) unless fan_power_coefficient_3.nil? fan.setFanPowerCoefficient4(fan_power_coefficient_4) unless fan_power_coefficient_4.nil? fan.setFanPowerCoefficient5(fan_power_coefficient_5) unless fan_power_coefficient_5.nil? return fan end # creates a variable volume fan from a json # # @param model [OpenStudio::Model::Model] OpenStudio model object # @param fan_json [Hash] hash of fan properties # @param fan_name [String] fan name # @param fan_efficiency [Double] fan efficiency # @param pressure_rise [Double] fan pressure rise in Pa # @param motor_efficiency [Double] fan motor efficiency # @param motor_in_airstream_fraction [Double] fraction of motor heat in airstream # @param fan_power_minimum_flow_rate_input_method [String] options are Fraction, FixedFlowRate # @param fan_power_minimum_flow_rate_fraction [Double] minimum flow rate fraction # @param end_use_subcategory [String] end use subcategory name # @param fan_power_coefficient_1 [Double] fan power coefficient 1 # @param fan_power_coefficient_2 [Double] fan power coefficient 2 # @param fan_power_coefficient_3 [Double] fan power coefficient 3 # @param fan_power_coefficient_4 [Double] fan power coefficient 4 # @param fan_power_coefficient_5 [Double] fan power coefficient 5 # @return [OpenStudio::Model::FanVariableVolume] variable volume fan object def create_fan_variable_volume_from_json(model, fan_json, fan_name: nil, fan_efficiency: nil, pressure_rise: nil, motor_efficiency: nil, motor_in_airstream_fraction: nil, fan_power_minimum_flow_rate_input_method: nil, fan_power_minimum_flow_rate_fraction: nil, end_use_subcategory: nil, fan_power_coefficient_1: nil, fan_power_coefficient_2: nil, fan_power_coefficient_3: nil, fan_power_coefficient_4: nil, fan_power_coefficient_5: nil) # check values to use fan_efficiency ||= fan_json['fan_efficiency'] pressure_rise ||= fan_json['pressure_rise'] motor_efficiency ||= fan_json['motor_efficiency'] motor_in_airstream_fraction ||= fan_json['motor_in_airstream_fraction'] fan_power_minimum_flow_rate_input_method ||= fan_json['fan_power_minimum_flow_rate_input_method'] fan_power_minimum_flow_rate_fraction ||= fan_json['fan_power_minimum_flow_rate_fraction'] fan_power_coefficient_1 ||= fan_json['fan_power_coefficient_1'] fan_power_coefficient_2 ||= fan_json['fan_power_coefficient_2'] fan_power_coefficient_3 ||= fan_json['fan_power_coefficient_3'] fan_power_coefficient_4 ||= fan_json['fan_power_coefficient_4'] fan_power_coefficient_5 ||= fan_json['fan_power_coefficient_5'] # convert values pressure_rise_pa = OpenStudio.convert(pressure_rise, 'inH_{2}O', 'Pa').get unless pressure_rise.nil? # create fan fan = create_fan_variable_volume(model, fan_name: fan_name, fan_efficiency: fan_efficiency, pressure_rise: pressure_rise_pa, motor_efficiency: motor_efficiency, motor_in_airstream_fraction: motor_in_airstream_fraction, fan_power_minimum_flow_rate_input_method: fan_power_minimum_flow_rate_input_method, fan_power_minimum_flow_rate_fraction: fan_power_minimum_flow_rate_fraction, end_use_subcategory: end_use_subcategory, fan_power_coefficient_1: fan_power_coefficient_1, fan_power_coefficient_2: fan_power_coefficient_2, fan_power_coefficient_3: fan_power_coefficient_3, fan_power_coefficient_4: fan_power_coefficient_4, fan_power_coefficient_5: fan_power_coefficient_5) return fan end end