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angle-left EDF-EIFER Test Case - Sensitivity test on the storage volume

General Description

The test case provides a set of conditions under which a test can determine whether or how well a system, component or one of its aspects is working given its expected function.


Name of test case: Sensitivity test on the storage volume

Partner: EDF-EIFER

Scope and Goal

What is the test objective, i.e. what is the purpose of carrying out the test? Try to formulate the objective within one of the following three categories:

  1. Characterization: a measure is given without specific requirements for passing the test. Examples: understanding the behaviour of a system, developing a mathematical model of a component.
  2. Validation: a requirement and abstract measure is provided, but the results are subject to interpretation, i.e. passing a test depends on a qualitative evaluation by an expert or user of the system. These tests seek to answer the question are we building the right system? Example: Is the mathematical model good enough?
  3. Verification: acceptance of a test result depends on the direct evaluation against fixed and formalized assessment criteria. These criteria can be formulated as quantitative measures with a set/range of acceptable values of these measures, i.e. quantitative tests. These tests seek to answer the question are we building the system right? Example: Testing whether a component conforms to a standard.

To which system configuration does this test apply?



To which use case does this test apply?  

Timescales of optimum collective self-supply in sustainable long term urban energy system planning


Formulate one paragraph of narrative summarizing the test and its purpose:

The study focuses on understanding under which circumstances investing into (acquifer underground seasonal) long term storage is an efficient way to achieving sustainability objectives such as mitigating system CO2 emissions. Different scenarios will thus be investigated (Business as usual, CO2 tax implementation, Urban changes etc.).


For each of the scenarios, test cases aim to analyse the sensitivity of the optimum energy systems architecture given by the methodology, considering fluctuations of different parameters (eg. electricity prices). The purpose is to characterize the validity domain of the solution.

Identification of Test Components

What is the System Under Test, i.e. which subset of the entire system configuration needs to be simulated in order to achieve the test objective? (Note: In some cases this may be the entire system)

Entire local energy system (production, distribution, storage, useful energy)


What is the Object Under Investigation, i.e. which are the components of the System Under Test that are to be characterized or validated?

Storage units


What is the Decision Variable Under Investigation, i.e. which of the system behaviour defined in the use case is to be characterized, validated or verified?

Storage capacity

Test Criteria

Formulate the target metrics, i.e. a list of quantities in the context of the System Under Test which can be used to qualify/quantify the test result with respect to the test objective.

Storage capacity


Define quality attributes for assessing an acceptable test result. In case of a characteri-

zation test, this may be the remaining model uncertainty. For verification tests, the acceptance threshold (worst case for passing the test) is stated. For validation tests a criterion for ending the test execution is required.


  • Existence of a feasible solution
  • Fluctuation of the storage capacity +/- X%