Numerical Simulations of a supersonic multiphase ejector for high-temperature heat-pumps

Background

Heat Pump Systems enable the use of waste heat by using small amounts of electricity and thus efficiently substitute the use of primary energy such as coal and gas, therefore, they are particularly relevant for the manufacturing industry. In the research project VLESH we focus our attention on ejectors, an innovative component of a heat pump, that allow an increase in efficiency of up to 27% compared to conventional systems.

Thesis objectives

In the course of the diploma thesis, the following objectives are planned:
1. Conduction of a comprehensive literature study on useable numerical models.
2. Conduction and analysis of 2D numerical simulations based on existing models.
3. Implementation of a new homogeneous non-equilibrium model with boiling phenomenon (HNB) under the guidance of the VLESH team (AIT, TU Wien)
4. Validation of the results against experimental data
5. Evaluation of the results obtained and preparation for use in scientific studies and publications.

Thesis learnings

The student will gain knowledge in following areas under the guidance of the VLESH team
- fluid dynamics and heat transfer in ejectors
- muliphase supersponic flows
- application and adaption of a commercial CFD Navier Stokes Suite (ANSYS Fluent)
- scientific writing, visualization and presentation of scientifc results

Time schedule

The student will be employed and compensated financially by AIT Austrian institute of Technology. The work will be done in Vienna. The thesis is expected to start under January 2025 (wk. 3) and be completed in June 2025 (wk. 26).

Supervisor at KTH

Supervisor at AIT, Center for Energy

Christoph Reichl , Senior Scientist:
Julian Unterluggauer , Research Engineer