Operation profiles – Energy Evaluation

19 September 2012 James Service No Comments
ArchiCAD, ArchiCAD 16, Tip of the Day

Operation Profiles define the Function and the Energy Loads for particular building uses. The default Operation Profiles are based on the DIN 18599 Standard – Energy Efficiency of Buildings.

Operation Profiles can be accessed from from the Model Review Palette’s pop-up at the top right, from Design > Energy Evaluation > Operation Profile, or with the Options > Element Attributes > Operation Profiles command.

Operation Profile associates predefined schedules to each Occupancy type, by hour, for a full year (8760 hours total) this includes

> Required Internal temperature range

> Internal heat gain (human, lighting, equipment)

> Hot water needs

> Humidity loads

As you choose a building function, the associated Operation Profile is assigned to the project.

The Operation Profile dialog is also used for specifying the custom average interior lighting power density (LPD, in W/m2) of the project, independently from the building function.

When you select different Operation Profiles you will see these parameters change according to the profiles definition. If you have chosen Multiple Building functions the main profile will be displayed.

The ArchiCAD help has full documentation on the the different profiles and their use. What we are going to focus on it how to create your own custom definition.

You may find the Operation Profile you have chosen doesn’t give you a good representation of your particular buildings function. To create a new Profile it is best to base it on an existing definition so choose an existing Operation Profile the best matches the one you would like to create. We have found the residential profile to have a higher Service hot-water load and Occupancy Count than what we would expect in New Zealand, this is the example we will use in this Tip.

The data represented in the Operation Profile is all defined in the Attribute stored in your project. This Attribute can be exported to a ArchiCAD attribute file .att or as a simple .xml file. An XML file can be edited in a basic text editing program (wordpad or textedit) allowing you with a bit a knowledge to fine tune your profile.

First in the Attribute Manager choose the Operation Profile you wish to use as an basis for your new profile. Duplicate this and rename it to your new Operation Profile. Append your new Operation Profile to the right hand side of the Attribute manager and Save as a xml (not the typical default of att).

Open the XML file in a text (wordpad or textedit) or xml editing application. For our residential profile we want to edit the fields <OccupancyCount>30<OccupancyCount> You will see there is 24 entries one for each hour of the day, the value is set to 30m2 the New Zealand average occupancy ratio is approximately 50m2 so we will set all of the fields to this value <OccupancyCount>50<OccupancyCount>.

Once you have finished making these changes save the xml file. Back in the Attribute Manager, Open the file you just saved and either Append or Overwrite

Check the Operation Profile by going to Options > Element Attribute > Operation Profiles note you will only see the Hot water service-load change in this dialog, but you should see the change in the Occupancy Count if you run an Energy Evaluation with your new Operation Profile and the one you based it on.

 

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