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class ASHRAE9012019 < ASHRAE901
# @!group FanOnOff
# Determine the prototype fan pressure rise for an on off fan on an AirLoopHVAC or inside a unitary system based on system airflow.
# Defaults to the logic from ASHRAE 90.1-2004 prototypes.
#
# @param fan_on_off [OpenStudio::Model::FanOnOff] on off fan object
# @return [Double] pressure rise in inches H20
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
19 entries across 19 versions & 1 rubygems