(Rather than creating a new question I think it is better to continue here for future reference.)
I managed to change the COP with a measure, but it does not seem to have an impact on Total Source Energy as I would expect. My guess is that Total Source Energy is using the Site=>Source Conversion Factor directly and maybe these are hardcoded. They clearly use the default COP because 1/3*3.167 == 1.056.
In any case the measure that I used is the following.
# define the arguments that the user will input
def arguments(model)
args = OpenStudio::Measure::OSArgumentVector.new
# make an argument for reduction percentage
cop_percentage_increase = OpenStudio::Measure::OSArgument.makeDoubleArgument('cop_percentage_increase', true)
cop_percentage_increase.setDisplayName('COP Percentage Reduction')
cop_percentage_increase.setDefaultValue(30.0)
cop_percentage_increase.setUnits('%')
args << cop_percentage_increase
return args
end
# define what happens when the measure is run
def run(model, runner, user_arguments)
super(model, runner, user_arguments)
# use the built-in error checking
if !runner.validateUserArguments(arguments(model), user_arguments)
return false
end
# assign the user inputs to variables
cop_percentage_increase = runner.getDoubleArgumentValue('cop_percentage_increase', user_arguments)
# report initial condition of model
default_district_cooling_cop = model.getEnvironmentalImpactFactors.districtCoolingCOP
runner.registerInitialCondition("The initial COP is #{default_district_cooling_cop}")
# update the cop
new_district_cooling_cop = (1.0 + cop_percentage_increase / 100.0) * default_district_cooling_cop
model.getEnvironmentalImpactFactors.setDistrictCoolingCOP(new_district_cooling_cop)
# report final condition of model
runner.registerFinalCondition("The final COP is #{new_district_cooling_cop}")
return true
It does what it is supposed to do as proven by this object in in.osm, but as I said before, it does not seem to have an impact.
OS:EnvironmentalImpactFactors,
{afc10e04-f75d-468e-ad6a-1e1da289ed66}, !- Handle
0.3, !- District Heating Efficiency
3.9, !- District Cooling COP {W/W}
0.25, !- Steam Conversion Efficiency
80.7272, !- Total Carbon Equivalent Emission Factor From N2O {kg/kg}
6.2727, !- Total Carbon Equivalent Emission Factor From CH4 {kg/kg}
0.2727; !- Total Carbon Equivalent Emission Factor From CO2 {kg/kg}
It does not really matter for my code as I just wanted to make this change with a measure so that it works with the existing UI, but it would be interesting to understand if I am doing something wrong.
