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Convert site electricity sensor from Joules to watts #464

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Jun 28, 2024
Merged

Convert site electricity sensor from Joules to watts #464

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1 change: 1 addition & 0 deletions alfalfa_worker/jobs/openstudio/lib/alfalfa-lib-gem/lib/utils.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@ def get_idd_type(object)
# @return [String]
def create_ems_str(id)
id = id.gsub(/[\s-]/, '_')
id = id.gsub(/[^\w]/, '_')
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@TShapinsky TShapinsky Feb 6, 2024 •
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Without this the function is not idempotent. It will prepend _ forever

id = "_#{id}" if (id =~ /[0-9].*/) == 0
id
end
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40 changes: 36 additions & 4 deletions alfalfa_worker/jobs/openstudio/lib/workflow/measures/alfalfa_site_sensors/measure.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,9 @@
# start the measure
class AlfalfaSiteSensors < OpenStudio::Measure::EnergyPlusMeasure


FuelMeter = Struct.new(:fuel, :adjustment_factor)

include OpenStudio::Alfalfa::EnergyPlusMixin
# human readable name
def name
Expand All @@ -26,9 +29,13 @@ def arguments(workspace)
return args
end

def create_output_meter(name)
def create_output_meter(name, adjustment_factor=1)
sensor_name = "#{create_ems_str(name)}_sensor"
output_name = "#{create_ems_str(name)}_output"
adjusted_name = "#{create_ems_str(name)}_sensor_adjusted"
program_calling_manager_name = "#{create_ems_str(name)}_calling_point"
program_name = "#{create_ems_str(name)}_program"

new_meter_string = "
Output:Meter,
#{name};
Expand All @@ -45,7 +52,32 @@ def create_output_meter(name)
new_sensor_object = OpenStudio::IdfObject.load(new_sensor_string).get
@workspace.addObject(new_sensor_object)

create_ems_output_variable(output_name, sensor_name)
new_global_variable_string= "
EnergyManagementSystem:GlobalVariable,
#{adjusted_name}; !- Name
"

new_global_variable_object = OpenStudio::IdfObject.load(new_global_variable_string).get
@workspace.addObject(new_global_variable_object)

new_program_string = "
EnergyManagementSystem:Program,
#{program_name}, !- Name
SET #{adjusted_name} = #{sensor_name}*#{adjustment_factor};
"
new_program_object = OpenStudio::IdfObject.load(new_program_string).get
@workspace.addObject(new_program_object)

new_calling_manager_string = "
EnergyManagementSystem:ProgramCallingManager,
#{program_calling_manager_name}, !- Name
EndOfZoneTimestepAfterZoneReporting, !- EnergyPlus Model Calling Point
#{program_name};
"
new_calling_manager_object = OpenStudio::IdfObject.load(new_calling_manager_string).get
@workspace.addObject(new_calling_manager_object)

create_ems_output_variable(output_name, adjusted_name)
end

# define what happens when the measure is run
Expand All @@ -58,11 +90,11 @@ def run(workspace, runner, user_arguments)
end

fuels = [
'Electricity'
FuelMeter.new('Electricity', 1.0/60)
]

fuels.each do |fuel|
register_output(create_output_meter("#{fuel}:Facility")).display_name = "Whole Building #{fuel}"
register_output(create_output_meter("#{fuel.fuel}:Facility", fuel.adjustment_factor)).display_name = "Whole Building #{fuel.fuel}"
end

report_inputs_outputs
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