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The Flexibility-Evaluation-Tool (FET)

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The Flexibility-Evaluation-Tool (FET) has been developed within the IEA EBC, Annex 67 – Energy Flexible Buildings. It is an Excel-based tool to uniformly visualize, characterize and evaluate flexibility for different data input sources. The tool:

  • Evaluates of energy flexibility with different timesteps, timespans, cost functions/penalty signals based on a reference load profile, a load profile with flexible operation and a penalty signal/cost function
  • Includes a reduced number of energy flexibility evaluation criteria and indicators
  • Provides a way to compare results from simulations.

The excel workbook comprises two worksheets:

  • Energy Flexibility Evaluation
  • Boundary Conditions

The worksheet “Energy Flexibility Evaluation” collects the input data and also reports results. For the evaluation at least three inputs are needed:

  • Reference load without flexibility
  • Load with flexible operation
  • Cost function

Within the worksheet “Boundary conditions”, boundary conditions for the entered data like out-door temperature, global horizontal irradiation on horizontal plane, minimum comfort tempera-ture, maximum comfort temperature e.g. can be documented.


Legend to image:

(1) Overall inputs for timespan, timesteps, cost-function/penalty function and units

(2) Input data about a buildings load profile, a flexible load profile and a cost function based on the timesteps, timespan and units

(3) Evaluation charts and characterization