TY - JOUR AU - Söğüt, M. Ziya AU - Kale, Utku AU - Rohács, Dániel TI - Hydraulic balance effect of heating systems considering exergetic sustainability JF - JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY J2 - J THERM ANAL CALORIM PY - 2024 PG - 10 SN - 1388-6150 DO - 10.1007/s10973-024-13042-6 UR - https://m2.mtmt.hu/api/publication/34803161 ID - 34803161 N1 - Maritime Faculty, Piri Reis University, Istanbul, Turkey Department of Aeronautics and Naval Architecture, Faculty of Transportation Engineering and Vehicle Engineering, Budapest University of Technology and Economics, Budapest, Hungary Export Date: 22 April 2024 CODEN: JTACF Correspondence Address: Söğüt, M.Z.; Maritime Faculty, Turkey; email: mzsogut@gmail.com AB - The energy and environmental sustainability of buildings is a crucial process that requires consideration alongside demand responsibility and hydraulic balance management. This study primarily involves a comparative analysis of a hydraulically balanced thermal system on campus using the entropy approach. Firstly, the effectiveness of the existing steam mechanical system and the performance of a 90/70 °C demand-side system were investigated. The environmental impact assessment of the system was assessed using the recommended environmental performance index and sustainability index criteria. The analysis showed up to 50% efficiency when choosing a balanced and demand-driven 90/70 °C system. However, the potential efficiency reached 77%, according to the environmental impact analysis. The sustainability analysis alone showed a gain of 39.65%. This text provides suggestions on the importance and sustainability of hydraulic balance in enhancing the efficiency of a working system. © Akadémiai Kiadó, Budapest, Hungary 2024. LA - English DB - MTMT ER - TY - JOUR AU - Jawaid, Mohammad AU - Awad, Sameer AU - Ismail, Ahmad Safwan AU - Hashem, Mohamed AU - Fouad, Hassan AU - UDDIN, IMRAN TI - Effect of kenaf fibre loading on thermal and dynamic mechanical properties of bio epoxy composites JF - JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY J2 - J THERM ANAL CALORIM VL - 2024 PY - 2024 SN - 1388-6150 DO - 10.1007/s10973-024-13017-7 UR - https://m2.mtmt.hu/api/publication/34788833 ID - 34788833 LA - English DB - MTMT ER - TY - JOUR AU - Kumar, Baibhaw AU - Raj, Arun K. AU - Szepesi, Gábor AU - Szamosi, Zoltán TI - Evaluating the efficacy of coconut oil as thermal storage media for enhancing solar drying performance of wood fuels JF - JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY J2 - J THERM ANAL CALORIM VL - 07 April 2024 PY - 2024 SN - 1388-6150 DO - 10.1007/s10973-024-13038-2 UR - https://m2.mtmt.hu/api/publication/34785738 ID - 34785738 AB - The appropriate storage, transportation, and utilization of wood-based fuels, including woodchips, pellets, and sawdust, in the energy production process, depends on their efficient drying. Traditional drying methods include limitations such as high thermal losses, inefficient heat transfer, and sustainability issues. These barriers, coupled with the high costs and complexities of maintaining the desired moisture content, underscore the need for innovative solutions. This study introduces a novel approach to wood fuel drying through the integration of phase-change materials (PCMs) with hybrid solar drying systems, aimed at enhancing thermal efficiency and sustainability. Employing coconut oil as the PCM, experiments were performed under a consistent artificial radiation of 755 W m −2 . The hybrid system demonstrated the capability to retain approximately 200 watts of useful heat for three hours post-radiation, marking a significant improvement in heat storage. Our findings reveal peak thermal and exergy efficiencies of 30–35% and 13–14%, respectively. An economic and environmental analysis predicts a system lifespan of five years, with the cost of generating one kilogram of hot air at 0.0058 EUR and an annual CO 2 emission of 64.09 kg. This research offers a cost-effective and environmentally friendly method for wood fuel drying, presenting a significant advancement for large-scale producers and setting a benchmark for further exploration of wood fuel drying technologies. LA - English DB - MTMT ER - TY - JOUR AU - Varma, Anwesha AU - Nidhul, Kottayat TI - Thermo-hydraulic and entropy generation analysis of nanofluid flow with variable properties in various duct cross sections: a 3-D two-phase approach JF - JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY J2 - J THERM ANAL CALORIM VL - March PY - 2024 SP - 1 SN - 1388-6150 DO - 10.1007/s10973-024-12940-z UR - https://m2.mtmt.hu/api/publication/34774012 ID - 34774012 AB - A three-dimensional computational fluid dynamics (CFD) study is carried out to explore the effect of duct cross section on the thermo-hydraulic performance of various ducts. A finite volume-based scheme with an SST k -omega model and mixture model (two-phase model) was used to obtain more realistic results. A two-phase mixture model was used to consider the movement between base fluid and nanoparticles. Al 2 O 3 nanoparticle having a volume fraction of 0.01% and 42 nm as particle size, the heat transfer and friction factor characteristic are studied for turbulent flow regime (3000 < Re < 9000) with variable thermo-physical properties. A maximum enhancement of 86% in heat transfer rate is obtained for the serpentine duct compared to the conventional circular duct at Re = 4500. Owing to a significantly lower increase in pressure drop, the elliptical duct has the highest thermo-hydraulic performance parameter of 1.54 relative to the circular duct. Further, to analyze the heat transfer quality, the entropy generation rate is studied, and it is observed that the square duct reported the highest with an increase of 60% and the elliptical duct the lowest with a reduction of 54% relative to the circular duct. This study can aid in choosing the duct geometry to enhance the heat transfer rate with nanofluid for applications such as solar-thermal, heat exchangers, etc. LA - English DB - MTMT ER - TY - JOUR AU - Gál, Márton AU - Samaniego Andrade, Samantha Kathiuska AU - Fehér, Anna Éva AU - Farkas, Attila AU - Madarász, János AU - Horváth, Lili AU - Gordon, Péter AU - Kovács, Róbert Sándor AU - Nagyné László, Krisztina TI - Thermal diffusity in copper benzene-1,3,5-tricarboxylate–reduced graphite oxide mechanical composites JF - JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY J2 - J THERM ANAL CALORIM PY - 2024 PG - 13 SN - 1388-6150 DO - 10.1007/s10973-024-13021-x UR - https://m2.mtmt.hu/api/publication/34772009 ID - 34772009 N1 - Funding Agency and Grant Number: Nemzeti Kutatsi Fejlesztsi s Innovcis Hivatal [2020-3.1.1-ZFR-KVG-2020-00006]; National Research, Development and Innovation Fund of Hungary [2020-3.1.2-ZFR-KVG]; Hungarian grants [OTKA K143571, FK134277, TKP-6-6/PALY-2021]; Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund [TKP2021-NVA]; Sustainable Development and Technologies National Programme of the Hungarian Academy of Sciences (FFT NP FTA); Stipendium Hungaricum scholarship program of the Hungarian Government Funding text: We extend our warm thanks to G. Bosznai (BME) for the invaluable technical assistance. This work was performed in the frame of the 2020-3.1.1-ZFR-KVG-2020-00006 project, implemented with the support provided from the National Research, Development and Innovation Fund of Hungary, financed under the 2020-3.1.2-ZFR-KVG funding scheme. This research was also funded by the Hungarian grants OTKA K143571 and FK134277. The research is part of project no Project no. TKP-6-6/PALY-2021 has been implemented with the support provided by the Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund, financed under the TKP2021-NVA funding scheme. The research was also funded by the Sustainable Development and Technologies National Programme of the Hungarian Academy of Sciences (FFT NP FTA). SKSA is grateful to the Stipendium Hungaricum scholarship program of the Hungarian Government. AB - Metal organic frameworks (MOFs) and particularly copper benzene-1,3,5-tricarboxylate (HKUST-1) are excellent materials for gas storage (e.g., CH 4 , N 2 , H 2 adsorption) and gas separation. In this work, reduced graphene oxide (RGO)–HKUST-1 mechanical mixtures were studied in order to reveal the effect of RGO content on the pressure tolerance of the texture and heat conductivity. HKUST-1 was obtained by two different synthesis routes. Air-dried MOF and RGO were thoroughly mixed prior to the compression. Powder XRD and Raman spectroscopy were used to characterize the response of the crystal structure, while low-temperature nitrogen adsorption was used the follow the adsorption properties of the pellets. Finally, the "flash" heat pulse method was used to assess the thermal properties. The gas adsorption isotherms revealed that the adsorption capacity decreases when RGO is added. Based on Raman and XRD results, we found that the synthesis route has an effect on multiple scales. We experimentally confirmed that evaluation of the thermal diffusivity requires a model more complex than the simple Fourier equation, due to the inherent heterogeneous structure of the material. A good approximation of the Fourier coefficient of thermal diffusivity was obtained using the parameters of the Guyer–Krumhansl equation. The heat pulse experiments also revealed possible size-dependent behavior. LA - English DB - MTMT ER - TY - JOUR AU - Sanadar, Martina AU - Kovačević, Anđela AU - Cracchiolo, Maria AU - Melchior, Andrea AU - Tolazzi, Marilena TI - Thermodynamics of complex formation of silver(I) with substituted pyridines and cyclic amines in non-aqueous solvents JF - JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY J2 - J THERM ANAL CALORIM PY - 2024 SN - 1388-6150 DO - 10.1007/s10973-024-12894-2 UR - https://m2.mtmt.hu/api/publication/34753162 ID - 34753162 AB - The understanding of the thermodynamic stability and speciation of metal complexes in solution requires access to their enthalpy and entropy of formation. In this work, we specifically focus our investigation on the complexation process of silver(I) ion in acetonitrile (AN) with substituted mono pyridines and cyclic monoamines. The aim of this study is to provide reliable thermodynamic data to obtain insights on metal complex formation, focusing on ligands donor properties and solvation effects. Carefully designed potentiometric and calorimetric experiments allowed to define the species present at different ligand/metal ratios and to obtain the complex formation constants and enthalpies. In general, the enthalpy terms associated with the complex formation are highly exothermic, while the entropy values are always unfavorable. The formation constants of AgL j species for the ligands investigated in AN are compared with those previously obtained in dimethyl sulfoxide (DMSO) and water. The trends in stability constants and enthalpy values are discussed in relation to the p K a data available in the different solvents. Higher p K a values correspond to greater ligand basicity and result in more stable and more enthalpy stabilized complexes. LA - English DB - MTMT ER - TY - JOUR AU - Vámos, Csenge AU - Bárány, Tamás AU - Marosfoi, Botond Bela TI - Porous polypropylene produced by phase separation for high solar reflectivity and passive cooling JF - JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY J2 - J THERM ANAL CALORIM VL - Előzetes kiadás / Early view PY - 2024 PG - 13 SN - 1388-6150 DO - 10.1007/s10973-024-12891-5 UR - https://m2.mtmt.hu/api/publication/34727226 ID - 34727226 N1 - Funding Agency and Grant Number: Ministry of Culture and Innovation of Hungary Funding text: No Statement Available AB - Passive cooling techniques have gained widespread use in everyday life and various industries by utilizing sunlight reflection to cool objects without requiring additional energy input. Porous polymer materials possess the unique ability to provide both thermal insulation and solar reflection due to their inherent multiphase structure. In this study, we developed a porous polypropylene (PP) with a hierarchically structured surface layer using a simple and efficient solvent treatment method based on recrystallization. As a result, the porous structure and hierarchically structured surface significantly increase the solar reflectance from 11 to 86%. We found that by manipulating the recrystallization process and using reflective additives, solar reflectivity can be further improved. With the use of TiO2 and BaSO4 additives, a solar reflectance of 90% was achieved, while a solar reflectance of 93% was achieved with nucleating agents. In practical terms, these improvements result in significant temperature reductions in cooling performance tests compared to extruded PP sheets: 17, 19, and 22 degrees C for porous PP, porous PP/TiO2 or PP/BaSO4, and porous nucleated PP, respectively. The modification method introduced could help PP offer new possibilities for developing low-cost chemically resistant and thermally insulating layers in thermal management applications. LA - English DB - MTMT ER - TY - JOUR AU - Fehér, Anna Éva AU - Kovács, Róbert Sándor AU - Sudár, Ákos AU - Barnaföldi, Gergely Gábor TI - Challenges in the thermal modeling of highly porous carbon foams JF - JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY J2 - J THERM ANAL CALORIM VL - Előzetes kiadás / Early view PY - 2024 PG - 12 SN - 1388-6150 DO - 10.1007/s10973-024-12927-w UR - https://m2.mtmt.hu/api/publication/34691294 ID - 34691294 N1 - Export Date: 4 April 2024 CODEN: JTACF AB - The heat pulse (flash) experiment is a well-known, widely used method to determine thermal diffusivity. However, for heterogeneous, highly porous materials, neither the measurement nor the evaluation methodologies are straightforward. In the present paper, we focus on two open-cell carbon foam types, differing in their porosity but having the same sample size. Recent experiments showed that a non-Fourier behavior, called ’over-diffusive’ propagation, can be present for such a complex structure. The (continuum) Guyer–Krumhansl equation stands as a promising candidate to model such transient thermal behavior. In order to obtain a reliable evaluation and thus reliable thermal parameters, we utilize a novel, state-of-the-art evaluation procedure developed recently using an analytical solution of the Guyer–Krumhansl equation. Based on our observations, it turned out that the presence of high porosity alone is necessary but not satisfactory for non-Fourier behavior. Additionally, the mentioned non-Fourier effects are porosity-dependent; however, porous samples can also follow the Fourier law on a particular time scale. These data serve as a basis to properly identify the characteristic heat transfer mechanisms and their corresponding time scales, which altogether result in the present non-Fourier behavior. Based on these, we determined the validity region of Fourier’s law in respect of time scales. LA - English DB - MTMT ER - TY - JOUR AU - Wei, Qi AU - Zhang, Jiale AU - Cheng, Yulong AU - Xie, Zhehan AU - Liu, Yingting AU - Zhou, Keqing TI - Surface modification of MXene nanosheets with P-N-containing agents for boosting flame retardancy of epoxy resin JF - JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY J2 - J THERM ANAL CALORIM PY - 2024 SN - 1388-6150 DO - 10.1007/s10973-024-12938-7 UR - https://m2.mtmt.hu/api/publication/34686204 ID - 34686204 N1 - Faculty of Engineering, China University of Geosciences (Wuhan), Hubei, Wuhan, 430074, China School of Mechanical and Automotive Engineering, South China University of Technology, Wushan Road 381, Guangzhou, 510641, China China Academy of Safety Science and Technology, Beijing, 100012, China Export Date: 4 March 2024 CODEN: JTACF Correspondence Address: Zhou, K.; Faculty of Engineering, Hubei, China; email: zhoukq@cug.edu.cn Correspondence Address: Cheng, Y.; China Academy of Safety Science and TechnologyChina; email: elaine.528@163.com LA - English DB - MTMT ER - TY - JOUR AU - Bharadwaj, Gaurav AU - Sharma, Kamal AU - Pandey, A. K. AU - Gupta, Aayush TI - Carbon nanotube-graphene-based nanofluids: a comprehensive review on the role of thermal conductivity and its solar energy applications JF - JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY J2 - J THERM ANAL CALORIM PY - 2024 PG - 35 SN - 1388-6150 DO - 10.1007/s10973-023-12840-8 UR - https://m2.mtmt.hu/api/publication/34660457 ID - 34660457 LA - English DB - MTMT ER -