Inspection facility  |  Sample projects

Sample projects

Components/validation tests

Fig 1.

Pressure change test


Fig 2.

Residual moisture test according to DIN 8964


Fig 3.

Joining force measuring of an O-ring connection

Within the scope of prototype or validation tests, the following specific properties are proved:


  • Pressure change tests
    • Pressure range 1 - 160 bar
    • Temperature range 20 - 140 °C
  • Temperature change tests
    • Temperature range -40 - 180 °C
  • Vibration tests
    • Frequency range 10 - 70 Hz
    • Amplitude 0,1 - 6 mm
    • Temperature range 20 - 140 °C
  • Special tests
    • Measuring of joining/disassembling forces
    • Corrosion test
    • Artificial ageing
    • Bursting strength test
    • Low pressure resistance
    • Cleanness test
    • Residual moisture test

Failure analysis and interpretations

Fig 5.

Feasibility study with regard to the use of CO2 in buses

These services include:


  • Failure analysis of components
  • Determination of the cause of failure
  • Evaluation of the operational safety
  • Feasibility studies
  • Testing of application limits

Fig 4.

Damaged compressor


Development and project planning

  • Testing of existing designs
  • Consulting service and dimensioning of components
  • Project planning of refrigeration systems
  • Procurement of components

Design and setting up of testing facilities and testing facility components

Fig 7.

15 kW humidifier

The testing facilities used at TWK and the CO2-Testzentrum are self-designed. We share our experience with our customers – reaching from pure support with regard to the planning/design of testing facilities to the point of delivery of entire testing facilities and testing facility components.


Fig 6.

Endurance testing facility for compressors


External testings

For many years, we have performed vehicle tests at home and abroad on behalf of our customers. This may be routine testing of the vehicle a/c unit, in many cases together with an optimization of the system. Our services range from support or validation and interpretation of measured values to the entire measuring equipment of vehicles and systems.


Fig 8.

CO2 leakage in a city bus

Fig9.

Testing of a bus a/c unit in Southern Europe


Fig 11.

Testing the oil recirculation in a/c units

Fig 10.

Testing of an a/c unit in the wind channel


Fig 12.

Testing of an a/c unit in a railway carriage