Thesis supervisor: Krisztián Hriczó
Location of studies (in Hungarian): Institute of Mathematics Abbreviation of location of studies: MAT
Description of the research topic:
One of the most earnest issues in the world is energy. As we know, there are many sources of energy such as fossil fuel which is the most common and most important source. Besides, this non-renewable energy source is depleting drastically and due to the many problems, it caused, attention has been given to a renewable source to meet the population growth. Out of various renewable forms of energy, solar energy is the most effective one. Solar energy is radiant light and heat from the sun that can be used in various applications in our day-to-day life. It is a reliable and inexpensive source of energy for most countries. Using this source can be spread with the increase of efficiency of solar systems.
Some of the widely seen solar energy-based applications are solar water heating thermosiphon systems, solar hot air systems, space heating and cooling, solar heat pumps, refrigeration, industrial process of heat for air and water systems, steam generation systems, desalination, and thermal power systems. Among the solar thermal technology, the flat-plate solar collectors have been widely used as air heaters or water heaters. For air collectors, enhancing heat transfer from the surface area is the main objective. Different types of roughness elements on the absorber plate, collectors with expanded metal mesh and fins, various channel geometry were used for efficiency enhancement. The principal types of solar air heaters are the single pass with airflow above the absorber, airflow below the absorber, double airflow above and below the absorber, and double-pass. Water collectors are the most fundamental and most studied technology for solar-power domestic hot water systems. Many kinds of research have been made to enhance the thermal performance of such collectors. In general, increasing the energy performance of solar collectors can be done in two ways:
a- Using a new technologies, materials, and components.
b- Combining of already existing solar utilization technologies in one facility (hybrid collector).
One of the recent trends is to combine two known technologies, for developing a device that works in combination, known as a hybrid or dual-purpose collector which is used in order to increase the annual application of solar energy and maximizing the operating time. The collector can generate not only hot air for spacing heating in winter but also hot water in other seasons. Such integrated design makes it more cost-effective than those conventional solar water or air systems.
The aim of the research is the numerical investigation of dual-fluid solar collectors, combining the air and liquid solar collectors. The idea of combining both types of technology in a dual solar collector is not new. A number of researchers studied the thermal performance of dual air/ water collectors. No one has studied or investigate the use of alternative liquids such as engine oil, engine coolant, and/or nanofluids instead of water. The aim of this study is to enhance the thermal performance of a dual-purpose solar collector (DPSC) by using the three alternative liquids separately.
Kutatási feltételek: A kutatáshoz szükséges adatbázis hozzáférések és matematikai illetve szimulációs modellezéshez szükséges szoftverek.
További elvárások:
• Nyelvtudás: a szakirodalom tanulmányozásához elengedhetetlen angol nyelv megfelelő ismerete
• Egyéb ismeretek:
napkollektorok ismerete
Ajánlott irodalom a kutatómunkához:
• Assari, M. R., Basirat Tabrizi H., and Jafari I., Experimental and theoretical investigation of dual purpose solar collector, Solar Energy 85 (2011) 601–608.
• Bognár, G. and Hriczó, K.: Numerical simulation of water based ferrofluid flows along moving surfaces, PROCESSES 8 : 7 Paper: 830 (2020)
• Hriczó, K.: Nemlineáris peremértékfeladatok megoldása és műszaki, logisztikai alkalmazásai, ME, Gépészmérnöki és Informatikai Kar, Diplomamunka, 2009
• Kalogirou, A. S., Solar thermal collectors and applications, Prog. Energy Combust. Sci., 30 (2004) 231–295.
• Kumar, P. G., Balaji, K., Sakthivadivel, D., Vigneswaran, V. S., Velraj, R., & Kim, S. C. Enhancement of heat transfer in a combined solar air heating and water heater system. Energy, 221 (2021)
Number of students who can be accepted: 1
Deadline for application: 2024-12-31
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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