Contents

class ASHRAE9012016 < ASHRAE901
  # @!group FanOnOff

  # Determine the prototype fan pressure rise for an on off
  # fan on an AirLoopHVAC or inside a unitary system
  # based on the airflow of the system.
  # @return [Double] the pressure rise (in H2O).  Defaults
  # to the logic from ASHRAE 90.1-2004 prototypes.
  def fan_on_off_airloop_or_unitary_fan_pressure_rise(fan_on_off)
    # Get the max flow rate from the fan.
    maximum_flow_rate_m3_per_s = nil
    if fan_on_off.maximumFlowRate.is_initialized
      maximum_flow_rate_m3_per_s = fan_on_off.maximumFlowRate.get
    elsif fan_on_off.autosizedMaximumFlowRate.is_initialized
      maximum_flow_rate_m3_per_s = fan_on_off.autosizedMaximumFlowRate.get
    else
      OpenStudio.logFree(OpenStudio::Warn, 'openstudio.prototype.FanOnOff', "For #{fan_on_off.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 < 7437
                             2.5
                           else # Over 7,437 cfm
                             4.09
                           end

    return pressure_rise_in_h2o
  end
end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
openstudio-standards-0.2.14	lib/openstudio-standards/prototypes/ashrae_90_1/ashrae_90_1_2016/ashrae_90_1_2016.FanOnOff.rb
openstudio-standards-0.2.13	lib/openstudio-standards/prototypes/ashrae_90_1/ashrae_90_1_2016/ashrae_90_1_2016.FanOnOff.rb
openstudio-standards-0.2.13.rc3	lib/openstudio-standards/prototypes/ashrae_90_1/ashrae_90_1_2016/ashrae_90_1_2016.FanOnOff.rb