Class: OpenStudio::Model::PumpVariableSpeed

Inherits:
Object
  • Object
show all
Includes:
Pump
Defined in:
lib/openstudio-standards/standards/Standards.PumpVariableSpeed.rb,
lib/openstudio-standards/hvac_sizing/Siz.PumpVariableSpeed.rb

Overview

open the class to add methods to return sizing values

Instance Method Summary collapse

Methods included from Pump

#apply_prm_pressure_rise_and_motor_efficiency, #apply_standard_minimum_motor_efficiency, #brake_horsepower, #motor_horsepower, #pump_power, #rated_w_per_gpm, #standard_minimum_motor_efficiency_and_size

Instance Method Details

#applySizingValues ⇒ Object

Takes the values calculated by the EnergyPlus sizing routines and puts them into this object model in place of the autosized fields. Must have previously completed a run with sql output for this to work.



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# File 'lib/openstudio-standards/hvac_sizing/Siz.PumpVariableSpeed.rb', line 13

def applySizingValues

  rated_flow_rate = self.autosizedRatedFlowRate
  if rated_flow_rate.is_initialized
    self.setRatedFlowRate(rated_flow_rate.get) 
  end
  
  rated_power_consumption = self.autosizedRatedPowerConsumption
  if rated_power_consumption.is_initialized
    self.setRatedPowerConsumption(rated_power_consumption.get)
  end
  
  
end

#autosize ⇒ Object

Sets all auto-sizeable fields to autosize



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# File 'lib/openstudio-standards/hvac_sizing/Siz.PumpVariableSpeed.rb', line 6

def autosize
  OpenStudio::logFree(OpenStudio::Warn, "openstudio.sizing.PumpVariableSpeed", ".autosize not yet implemented for #{self.iddObject.type.valueDescription}.")
end

#autosizedRatedFlowRate ⇒ Object

returns the autosized rated flow rate as an optional double



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# File 'lib/openstudio-standards/hvac_sizing/Siz.PumpVariableSpeed.rb', line 29

def autosizedRatedFlowRate

  # In E+ 8.5, (OS 1.10.5 onward) the column name changed
  col_name = nil
  if self.model.version < OpenStudio::VersionString.new('1.10.5')
    col_name = 'Rated Flow Rate'
  else
    col_name = 'Design Flow Rate'
  end  
 
  return self.model.getAutosizedValue(self, col_name, 'm3/s')
  
end

#autosizedRatedPowerConsumption ⇒ Object

returns the autosized rated power consumption as an optional double



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# File 'lib/openstudio-standards/hvac_sizing/Siz.PumpVariableSpeed.rb', line 44

def autosizedRatedPowerConsumption

  # In E+ 8.5, (OS 1.10.5 onward) the column name changed
  col_name = nil
  if self.model.version < OpenStudio::VersionString.new('1.10.5')
    col_name = 'Rated Power Consumption'
  else
    col_name = 'Design Power Consumption'
  end  
 
  return self.model.getAutosizedValue(self, col_name, 'W')
  
end

#set_control_type(control_type) ⇒ Object

Set the pump curve coefficients based on the specified control type.

are Riding Curve, VSD No Reset, VSD DP Reset

Parameters:

  • control_type (String) —

    valid choices



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# File 'lib/openstudio-standards/standards/Standards.PumpVariableSpeed.rb', line 11

def set_control_type(control_type)
  # Determine the coefficients
  coeff_a = nil
  coeff_b = nil
  coeff_c = nil
  coeff_d = nil
  case control_type
  when 'Constant Flow'
    coeff_a = 0.0
    coeff_b = 1.0
    coeff_c = 0.0
    coeff_d = 0.0
  when 'Riding Curve'
    coeff_a = 0.0
    coeff_b = 3.2485
    coeff_c = -4.7443
    coeff_d = 2.5294
  when 'VSD No Reset'
    coeff_a = 0.0
    coeff_b = 0.5726
    coeff_c = -0.301
    coeff_d = 0.7347
  when 'VSD DP Reset'
    coeff_a = 0.0
    coeff_b = 0.0205
    coeff_c = 0.4101
    coeff_d = 0.5753
  else
    OpenStudio.logFree(OpenStudio::Warn, 'openstudio.standards.PumpVariableSpeed', "Pump control type '#{control_type}' not recognized, pump coefficients will not be changed.")
    return false
  end

  # Set the coefficients
  setCoefficient1ofthePartLoadPerformanceCurve(coeff_a)
  setCoefficient2ofthePartLoadPerformanceCurve(coeff_b)
  setCoefficient3ofthePartLoadPerformanceCurve(coeff_c)
  setCoefficient4ofthePartLoadPerformanceCurve(coeff_d)
  setPumpControlType('Intermittent')

  # Append the control type to the pump name
  # self.setName("#{self.name} #{control_type}")

  return true
end