Thesis supervisor: Miklós Kassai
Location of studies (in Hungarian): Budapest University of Technology, Department of Building Service Engineering and Process Engineering Abbreviation of location of studies: EPGET
Description of the research topic:
a.) Antecedents:
The statistical data show that the application of active cooling is spread widely in residential and public buildings. In these buildings the ventilation proportion is significantly increased in the whole energy consumption. There are similar problems in the operation of post-insulation of existing buildings. In this case the energy consumption of the ventilation system gives a major proportion of the whole building services energy consumption. The timeliness of this research theme shows that the actual available calculation procedures and technical designing data are only rough approximations for analyzing the energy consumption of air handling units and the energy saved by the integrated heat or energy recovery units. There are not exact methods and unequivocal technical data.
In previous researches the production and development companies have not investigated the effectiveness of the energy recovery units under difference ambient air conditions and the period of defrost cycle when the heat recovery can only partly operate under difference ambient air temperatures. During this term a re-heater has to fully heat up the ambient cold air to the temperature of supplied air and generate the required heating demand to provide the necessary indoor air temperature.
b.) Aim of research:
Object of this research work is to conduct experimental and simulation investigation of the effectiveness, heat and moisture transfer characteristic of energy recovery units under different ambient air conditions.
c.) Tasks, main items, necessary time:
Firstly an extensive literature review is required to perform in the topic. The task of the candidate is to determine the effectiveness of the energy recovery unit by conducting temperature and humidity experimental testing. Transient investigation of the effectiveness of energy recovery. Investigation of heat and moisture transfer characteristics of energy recovery unit. Using the data run by the tests and simulation software getting more exact results closer to the real operation.
The necessary time request of the work: 4 years (8 semesters)
d.) Required equipment:
Energy recovery test facility installed into the Macskásy Indoor Air Quality and Thermal Comfort Laboratory of Department of Building Services and Process Engineering.
e.) Expected scientific results:
The attribute of the research work is working out of methods for basic science, but the new scientific results can be applicable relatively fast in the practice, and there is a high interest for these new scientific results also in the building service engineers and experts who works in the practice.
f.) References:
[1] Mohammad Rafati Nasr, Miklos Kassai, Gaoming Ge, Carey J. Simonson: Evaluation of defrosting methods for air-to-air heat/energy exchangers on energy consumption of ventilation. Applied Energy. Impact Factor: 5.746, vol. 151, pp. 32–40, DOI: 10.1016/j.apenergy.2015.04.022, (2015). (WoS: Q1)
[2] Miklos Kassai, Mohammad Rafati Nasr, Carey J. Simonson: A developed procedure to predict annual heating energy by heat and energy recovery technologies in different climate European countries. Energy and Buildings. Impact Factor: 2.884. Vol. l09 pp. 267-273, DOI: 10.1016/j.enbuild.2O15.10.008 (2015). (WoS: Q1)
[3] Miklos Kassai: Effectiveness and humidification capacity investigation of liquid-to-air membrane energy exchanger under low heat capacity ratios at winter air conditions. Journal of Thermal Science. Impact Factor: 0.401. Vo1.24, No.4, pp. 39I-397, DOI: l0.1007/s11630-015-0800-4 (2015). (WoS: Q4)
[4] Miklos Kassai, Carey J. Simonson: Performance investigation of liquid-to-air membrane energy exchanger under low solution/air heat capacity rates ratio conditions. Building Services Engineering Research & Technology. Impact Factor: 0.575. vol. 36(5) pp. 535-545 doi: 10.1177/0143624414564445. (2015). (WoS: Q4)
[5] Miklos Kassai, Carey J. Simonson: Experimental effectiveness investigation of liquid-to-air membrane energy exchangers under low heat capacity rates conditions. Experimental Heat Transfer. Impact Factor: 0.979. vol.29, pp. 1-11, DOI: 10.1080/08916152.2015.I02435I. (2014). (WoS: Q2)
[6] Miklos Kassai, Gaoming Ge, Carey J. Simonson: Dehumidification performance investigation of liquid-to-air membrane energy exchanger system. Thermal Science. Impact Factor: 1.222. DOI: 10.2298/TSCI140816129K (2014). (WoS: Q2)
[7] László Kajtár, Miklós Kassai, László Bánhidi: Computerised simulation of energy consumption of air handling units. Energy and Buildings. Impact Factor: 2.386, ISSN: ISSN: 0378-7788, DOI:10.1016/j.enbuild.2011.10.013, p. 54-59. (2011). (WoS: Q1)
Required language skills: ANGOL Number of students who can be accepted: 1
Deadline for application: 2017-10-19
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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