Investigations on the behaviour of the refrigerant R1234yf at leckages in the air conditioning unit

Department: Thermo- & Fluid Dynamics

Diplomarbeit Ref.Nr. B_045

Starting with 1st of January 2017 the EU guideline 2006/40EC prohibits the use of refrigerants with a global warming potential higher than 150 in mobile air conditioning systems. For the automotive industry there are now two refrigerants available: carbon dioxide (R744) or 2,3,3,3-tetrafluorpropene (R1234yf). The use of CO2 as a refrigerant requires a completely new air conditioning unit while R1234yf can replace the currently used refrigerant 1,1,1,2-Tetrafluorethan (R134a) without major modifications of the air conditioning unit.

In the framework of this project a test bed will be developed where investigations on the behaviour of R1234yf due to a leckage in the air conditioning unit will be carried out.  This this bed will be very close to a real engine compartment to ensure the transfer of the results to real world vehicles.  In this test bed temperatures, concentration of oxygen, R1234y and hydrofluoric acid will be measured as well as air speed and the number distribution of oil particles.

Your tasks:

  • Integration and start-up of a real refrigerant cycle in the testbed
  • Development of a system for measuring particle number distribution in the engine compartment. Simulation of the concentration distribution of R1234yf in the engine compartment using OpenFOAM

What you except:

  • Studies of physics, chemistry, mechanical engineering or equivalent
  • Interest in performing complex measure – and simulation tasks
  • Above-average engagement

What we offer:

  • Interesting work on a very actual and practical relevant research topic
  • Participation in a dedicated team in an international platform for research and development
  • Cooperation with a well-known German OEM



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