Zeotropic mixtures constitute one possibility of optimizing the
heat pump coefficient of performance by reducing the irreversibility in the
heat exchangers. The exergy destruction in the evaporator and condenser due to
finite temperature difference between the working fluid and the heat source or
sink can be reduced by matching the mixture temperature glide with the heat
source or heat sink temperature profiles. However, the use of zeotropic
mixtures implies a degradation of the heat transfer coefficient during both
evaporation and condensation process. Plate Heat Exchangers (PHEs) offer a
suitable solution for applications with zeotropic working fluid mixtures, since
it is possible to achieve high heat transfer coefficients due to the flow
turbulence generated by the characteristic plate corrugation patterns.
The student project will focus on design, modelling and
optimizing plate heat exchanger condensers for heat pumps using zeotropic mixtures.
The modelling framework – e.g. cycle, evaporators and other components
– will be provided and the student will focus his work on extending the
modelling framework in Matlab to include a detailed characterization of the
condenser (1D and/or 2D depending on the scope of the analysis).
The focus can be adjusted according to the student’s interest and can be framed as a special course or a final thesis. Some potential area of research are listed below:
- Assessing the impact of using different correlations on PHE and
- Combined heat exchanger – cycle optimizations with focus on both
heat transfer and pressure drops in the condenser
- Derivation of design guidelines
We look for master students with a background in thermodynamics
and heat transfer. Numerical work should be carried by using Matlab, for easier
integration with previous work. A basic knowledge of Matlab
programming is preferred, but not required.
If you are interested or need further
information, please contact Roberta Mancini (email@example.com).
For further reading on the topic
Thermodynamics, heat transfer