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Contents
class CBEST242008 < CBES
# @!group FanVariableVolume
# 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
else # Over 7,437 cfm
5.58
end
return pressure_rise_in_h2o
end
end
Version data entries
19 entries across 19 versions & 1 rubygems