Thesis supervisor: Attila Imre
Location of studies (in Hungarian): Department of Energy Engineering Abbreviation of location of studies: EGR
Description of the research topic:
a.) Preliminaries:
In our country as well as worldwide, there are many heat sources where the output temperature of the heat source or the yield of the heat source does not allow the use of conventional recovery methods, such as district heating or electricity generation. Such heat sources include geothermal wells (both thermal and dry), oil and gas wells and residual heat from many industrial processes. Without utilization, the heat from these sources is lost, and the dissipation of this already existing heat can also have an environmental impact. By utilizing them, these heat sources are very significant and if they could be harnessed, a significant reduction in the use of other energy sources could be achieved at a national or global level.
b.) Aim of research:
High-temperature heat sources can be used to generate electricity using conventional (steam) methods. However, if the yield from the heat source is low, this might not be a viable solution. In this case, as well as lower heat source temperatures, other alternative solutions have to be found. Most of the methods currently used are necessity-driven; we use them because there is nothing else to be used. In our research, we would like to investigate some alternative methods. (i) At low temperatures, it is possible to use organic working Rankine cycles or CO2 cycles, but the losses and self-consumption of the systems are often too high. In our investigations, we would investigate the possibility of reducing these losses, including the investigation of other energy conversion processes. (ii) It is a triviality that heat is most easily used as heat, i.e. for heating. In many cases, however, the heat source and the potential user are too far apart and it is not worthwhile to transfer the heat through an installed pipeline because of the yield of the heat source or other problems. Mobile transport of heat could solve this problem; our investigations would also cover this area. (iii) The third area combines the previous two; in principle, the simplest way to transport waste heat in carbon-free containers would be to use part of the stored heat to move the storage equipment. As the container is transporting heat for heating purposes, the temperature level might not be sufficient to use a conventional heat-to-shaft work cycle; further research is needed to develop a suitable cycle.
c.) Tasks to be carried out, their main elements and time required: review of the literature, study of the current maturity of the different technologies, 1 year. Study of the current maturity of the most advanced technologies, 0.5 year. Examination of the current state of the art of new technologies, 0.5 semester year. Optimization of selected technologies, 0.5 year. Investigating the role of methods in specific energy fields, 0.5 year. Writing of publications and thesis, 1 year. The tasks are not necessarily carried out in the above order.
d.) Required equipment:
Computer, access to literature, software, databases.
e.) Expected scientific results:
Developing complex heat recovery scenarios. Optimization of low-temperature cycles. Conceptual design of high-capacity mobile heat stores.
f.) References:
- Sindu Daniarta, Piotr Kolasiński, Attila R. Imre: Thermodynamics Efficiency of Trilateral Flash Cycle, Organic Rankine Cycle and Partially Evaporated Organic Rankine Cycle, Energy Conversion and Management, 249 (2021) 114731
- Axel Groniewsky, Réka Kustán and Attila Imre: Efficiency increase of biological methanation based Power-to-Methane technology using waste heat recovery with Organic Rankine Cycle, Periodica Polytechnica Chemical Engineering, 66(2022)596-608,
- Aram M. Ahmed, Attila R. Imre: Effect of the working fluids critical temperature on thermal performance for trilateral flash cycle and organic Rankine cycle, International Journal of Thermofluids, 20 (2023) 100417
Required language skills: English Number of students who can be accepted: 1
Deadline for application: 2024-10-15
2024. IV. 17. ODT ülés Az ODT következő ülésére 2024. június 14-én, pénteken 10.00 órakor kerül sor a Semmelweis Egyetem Szenátusi termében (Bp. Üllői út 26. I. emelet).
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