The Experts below are selected from a list of 29751 Experts worldwide ranked by ideXlab platform
Kamaruzzaman Sopian - One of the best experts on this subject based on the ideXlab platform.
-
mathematical modelling of a dual fluid concentrating photovoltaic thermal pv t Solar Collector
Renewable Energy, 2017Co-Authors: S S S Baljit, Ahmad Fudholi, Mohd Yusof Othman, Hoy Yen Chan, V A Audwinto, Siti Afiqah Abd Hamid, Saleem H Zaidi, Kamaruzzaman SopianAbstract:This study presents an improved photovoltaic-thermal (PV-T) Solar Collector system that integrates a PV panel with a serpentine-flow stainless steel tube as the water-heating component and a double-pass air channel as the air-heating component. A Fresnel lens is used as the glazing and primary concentrator, and compound parabolic concentrators (CPCs) are used as the secondary concentrator. The system can simultaneously generate hot air and hot water in addition to electricity, and the total energy generated per unit area is higher than that of a single-fluid system. This triple-function PV-T Solar Collector is well suited for a wide range of thermal applications and offers options for hot and/or cold air and water use depending on the application and energy needs. This paper establishes, develops, and validates a conceptual design for a concentrating PV-T dual-fluid Solar Collector with 1D steady-state energy-balance equations for the dual-fluid (air and water) configuration. Next, this model is used to predict the performance of the dual-fluid Solar Collector with varying air and water mass flow rates. Then, the simulation results of the single- and dual-fluid operational modes are compared. The simulated results have shown that the total equivalent efficiencies for single fluid condition have ranged from approximately 30 to 60%, and increased to a maximum efficiency of near to 90% for the case of the dual fluids. The dual fluids operation mode has reduced the Solar cells temperature and hence increased the electrical output.
-
performance and cost benefits analysis of double pass Solar Collector with and without fins
Energy Conversion and Management, 2013Co-Authors: Ahmad Fudholi, Kamaruzzaman Sopian, Mohd Hafidz Ruslan, Mohd Yusof OthmanAbstract:Abstract The performance and cost benefit analysis of double-pass Solar Collector with and without fins have been conducted. The theoretical model using steady state analysis has been developed and compared with the experimental results. The performance curves of the double-pass Solar Collector with and without fins, which included the effects of mass flow rate and Solar intensity on the thermal efficiency of the Solar Collector, were obtained. Results indicated that the thermal efficiency is proportional to the Solar intensity at a specific mass flow rate. The thermal efficiency increased by 9% at a Solar intensity of 425–790 W/m 2 and mass flow rate of 0.09 kg/s. The theoretical and experimental analysis showed a similar trend as well as close agreement. Moreover, a cost-effectiveness model has been developed examine the cost benefit ratio of double-pass Solar Collector with and without fins. Evaluation of the annual cost ( AC ) and the annual energy gain ( AEG ) of the Collector were also performed. The results show that the double-pass Solar Collector with fins is more cost-effective compared to the double-pass Solar Collector without fins for mass flow rate of 0.01–0.07 kg/s. Also, simulations were obtained for the double-pass Solar Collector with fins at Nusselt number of 5.42–36.21. The energy efficiency of Collector increases with the increase of Nusselt number. The results show that by increasing the Nusselt number simultaneously would drop the outlet temperature at any Solar intensity. Increase in Nusselt number causes an increase in energy efficiency. On the other hand, the exergy efficiency has been obtained, which the fluctuation of exergy efficiency was based on the Nusselt number, Collector length and Solar intensity level.
-
energy analysis and improvement potential of finned double pass Solar Collector
Energy Conversion and Management, 2013Co-Authors: Ahmad Fudholi, Kamaruzzaman Sopian, Mohd Hafidz Ruslan, Mohd Yusof Othman, B BakhtyarAbstract:Abstract Steady state energy balance equations for the finned double-pass Solar Collector have been developed. These equations were solved using the matrix inversion method. The predicted results were in agreement with the results obtained from the experiments. The predictions and experiments were observed at the mass flow rate ranging between 0.03 kg/s and 0.1 kg/s, and Solar radiation ranging between 400 W/m2 and 800 W/m2. The effects of mass flow rates and Solar radiation levels on energy efficiency, exergy efficiency and the improvement potential have been observed. The optimum energy efficiency is approximately 77%, which was observed at the mass flow rate of 0.09 kg/s. The optical efficiency of the finned double-pass Solar Collector is approximately 70–80%. The exergy efficiency is approximately 15–28% and improvement potential of 740–1070 W for a Solar radiation of 425–790 W/m2.
-
thermal efficiency of double pass Solar Collector with longitudinal fins absorbers
American Journal of Applied Sciences, 2011Co-Authors: Ahmad Fudholi, Kamaruzzaman Sopian, Mohd Hafidz Ruslan, Mohd Yusof Othman, M YahyaAbstract:Problem statement: One of the most important components of a Solar energy system is the Solar Collector. The performances of double-pass Solar Collector with longitudinal fins absorbers are analyzed. Approach: The study involves a theoretical study to investigate the effect of mass flow rate, number and height of fins on efficiency, which involves steady-state energy balance equations on the longitudinal fins absorber of Solar Collectors. The theoretical solution procedure of the energy equations uses a matrix inversion method and making some algebraic rearrangements. Results: The Collector efficiency increases as the number and height of fins increases. For a mass flow rate 0.02- 0.1kg/s, the double-pass Solar Collectors are efficiency about 36-73% in upper fins (type I), 37-75% in lower fins (type II) and 46-74% in upper and lower fins (type III). Conclusion: The efficiency of the Collector is strongly dependent on the flow rate, efficiency increase is about 35%.
-
evaluation of thermal efficiency of double pass Solar Collector with porous nonporous media
Renewable Energy, 2009Co-Authors: Kamaruzzaman Sopian, M A Alghoul, Ebrahim Ali M Alfegi, M Y Sulaiman, Elradi A MusaAbstract:The double-pass Solar Collector with porous media in the lower channel provides a higher outlet temperature compared to the conventional single-pass Collector. Therefore, the thermal efficiency of the Solar Collector is higher. A theoretical model has been developed for the double-pass Solar Collector. An experimental setup has been designed and constructed. The porous media has been arranged in different porosities to increase heat transfer, area density and the total heat transfer rate. Comparisons of the theoretical and the experimental results have been conducted. Such comparisons include the outlet temperatures and thermal efficiencies of the Solar Collector for various design and operating conditions. The relationships include the effect of changes in upper and lower channel depth on the thermal efficiency with and without porous media. Moreover, the effects of mass flow rate, Solar radiation, and temperature rises on the thermal efficiency of the double-pass Solar Collector have been studied. In addition, heat transfer and pressure drop relationships have been developed for airflow through the porous media. Close agreement has been obtained between the theoretical and experimental results. The study concluded that the presence of porous media in the second channel increases the outlet temperature, therefore increases the thermal efficiency of the systems.
Zafar Said - One of the best experts on this subject based on the ideXlab platform.
-
energy and exergy efficiency of a flat plate Solar Collector using ph treated al2o3 nanofluid
Journal of Cleaner Production, 2016Co-Authors: R Saidur, Zafar Said, M A Sabiha, Arif Hepbasli, N A RahimAbstract:Application of nanofluid to increase the thermal efficiency of a traditional Solar Collector is getting tremendous attention among the scientific community. Al2O3-water nanofluid, as a working fluid and its effect on the energy and exergy efficiencies of a flat plate Solar Collector was examined experimentally. Volume fraction used for this study was 0.1% and 0.3%, while the size of the nanoparticles was similar to 13 nm. Experiments were carried out using a stable nanofluid which was obtained by controlling the pH of the solution over a period of 30 days. The mass flow rates of the nanofluid varied from 0.5 to 1.5 kg/min. Energy and exergy efficiencies of a flat plate Solar Collector using water and nanofluids as working fluids were matched. The results revealed that nanofluids increased the energy efficiency by 83.5% for 0.3% v/v and 1.5 kg/min, whereas the exergy efficiency was enhanced by up to 20.3% for 0.1% v/v and 1 kg/min. Thermal efficiency of the system was found to be more than 50% compared to the existing system available in the literature. New findings on the stability and exergy analysis of the Solar Collector system operated with a pH controlled nanofluid are reported. (C) 2015 Elsevier Ltd. All rights reserved.
-
energy and exergy efficiency of a flat plate Solar Collector using ph treated al2o3 nanofluid
Journal of Cleaner Production, 2016Co-Authors: R Saidur, Zafar Said, M A Sabiha, Arif Hepbasli, N A RahimAbstract:Abstract Application of nanofluid to increase the thermal efficiency of a traditional Solar Collector is getting tremendous attention among the scientific community. Al 2 O 3 –water nanofluid, as a working fluid and its effect on the energy and exergy efficiencies of a flat plate Solar Collector was examined experimentally. Volume fraction used for this study was 0.1% and 0.3%, while the size of the nanoparticles was ∼13 nm. Experiments were carried out using a stable nanofluid which was obtained by controlling the pH of the solution over a period of 30 days. The mass flow rates of the nanofluid varied from 0.5 to 1.5 kg/min. Energy and exergy efficiencies of a flat plate Solar Collector using water and nanofluids as working fluids were matched. The results revealed that nanofluids increased the energy efficiency by 83.5% for 0.3% v/v and 1.5 kg/min, whereas the exergy efficiency was enhanced by up to 20.3% for 0.1% v/v and 1 kg/min. Thermal efficiency of the system was found to be more than 50% compared to the existing system available in the literature. New findings on the stability and exergy analysis of the Solar Collector system operated with a pH controlled nanofluid are reported.
-
energy and exergy efficiency of a flat plate Solar Collector using ph treated al2o3 nanofluid
Journal of Cleaner Production, 2016Co-Authors: R Saidur, Zafar Said, M A Sabiha, Arif Hepbasli, N A RahimAbstract:Abstract Application of nanofluid to increase the thermal efficiency of a traditional Solar Collector is getting tremendous attention among the scientific community. Al2O3–water nanofluid, as a working fluid and its effect on the energy and exergy efficiencies of a flat plate Solar Collector was examined experimentally. Volume fraction used for this study was 0.1% and 0.3%, while the size of the nanoparticles was ∼13 nm. Experiments were carried out using a stable nanofluid which was obtained by controlling the pH of the solution over a period of 30 days. The mass flow rates of the nanofluid varied from 0.5 to 1.5 kg/min. Energy and exergy efficiencies of a flat plate Solar Collector using water and nanofluids as working fluids were matched. The results revealed that nanofluids increased the energy efficiency by 83.5% for 0.3% v/v and 1.5 kg/min, whereas the exergy efficiency was enhanced by up to 20.3% for 0.1% v/v and 1 kg/min. Thermal efficiency of the system was found to be more than 50% compared to the existing system available in the literature. New findings on the stability and exergy analysis of the Solar Collector system operated with a pH controlled nanofluid are reported.
Hilmi Kuscu - One of the best experts on this subject based on the ideXlab platform.
-
hybrid transpired Solar Collector updraft tower
Solar Energy, 2018Co-Authors: Dogan Eryener, Hilmi KuscuAbstract:Abstract A novel hybrid Solar updraft tower prototype, which consists of photovoltaic panels and transpired Solar Collector, is studied, its function principle is described and its experimental performance is presented for the first time. A test unit of transpired Solar Collector updraft tower was installed at the campus of Trakya University Engineering Faculty in Edirne-Turkey in 2015. PV modules cover 42% of transpired Solar Collector area. PV and turbine power output, Solar radiation, ambient temperature, temperature rise, Collector cavity temperatures, and chimney velocities were monitored during 18 months. The results showed that hybrid Solar updraft tower efficiency increased by about 2% in average compared to stand-alone PV system. The temperature rise in hybrid Solar updraft tower is found to be 12–14 °C on the typical sunny day. Energy was produced continuously for 24 h. The results showed that Solar utilization ranges from 60% to 80% during daytime.
-
thermal performance of a transpired Solar Collector updraft tower
Energy Conversion and Management, 2017Co-Authors: Dogan Eryener, John C Hollick, Hilmi KuscuAbstract:Abstract A novel Solar updraft tower prototype, which consists of transpired Solar Collector, is studied, its function principle is described and its experimental thermal performance is presented for the first time. A test unit of transpired Solar Collector updraft tower was installed at the campus of Trakya University Engineering Faculty in Edirne-Turkey in 2014. Solar radiation, ambient temperature, Collector cavity temperatures, and chimney velocities were monitored during summer and winter period. The results showed that transpired Solar Collector efficiency ranges from 60% to 80%. The maximum temperature rise in the Collector area is found to be 16–18 °C on the typical sunny day. Compared to conventional Solar tower glazed Collectors, three times higher efficiency is obtained. With increased thermal efficiency, large Solar Collector areas for Solar towers can be reduced in half or less.
Gyula Gróf - One of the best experts on this subject based on the ideXlab platform.
-
evacuated tube Solar Collector performance using copper nanofluid energy and environmental analysis
Applied Thermal Engineering, 2019Co-Authors: Gyula Gróf, M A Sharafeldi, Eiyad Abunada, Omid MahiaAbstract:Abstract The effect of metallic copper nanoparticles on the thermal efficiency of an evacuated tube Solar Collector was studied. Different volume concentrations of copper nanoparticles e.i. 0.01%, 0.02% and 0.03% were examined to explore the effect of nanoparticles on evacuated Solar Collector performance. The tests were performed at three volume flow rates of 0.6 L/min, 0.7 L/min and 0.8 L/min. The results demonstrate a 50% increase in the output temperature. Also, the heat energy incremented from 417 W to 667 W, which is equivalent to 34% area reduction for the same energy production. The remarkable enhancement in the heat removal factor to reach a value of 0.97. Copper nanoparticles played a significant role to increase both the absorbed energy and the removal energy parameters. Their maximum values were found for a volume concentration of 0.03% and at the volume flow rate of 0.8 L/min to be 0.83 and 21.66, respectively. Finally, environmental analysis is carried out to find the role of copper nanoparticles in CO2 reduction. The comparison between current results with reported results in the literature for other types of nanoparticles, show the high potential of copper nanoparticles for Solar Collector applications.
-
efficiency of evacuated tube Solar Collector using wo3 water nanofluid
Renewable Energy, 2019Co-Authors: M A Sharafeldi, Gyula GrófAbstract:Abstract The thermal performance of the evacuated tube Solar Collector with WO3/Water Nanofluid was studied in this paper. The WO3 nanoparticles were spherical with 90 nm diameter Three different volume fraction of WO3 nanoparticles of 0.014%, 0.028%, and0.042% were examined at several mass flux rates of 0.013 kg/s.m2, 0.015 kg/s.m2 and 0.017 kg/s.m2. The stability of the nanofluid was checked. Experiments were performed in Budapest, Hungary on the latitude of 47°28′N and longitude of 19°03′E. The results showed that the temperature difference of the fluid increased up to 21% with adding WO3 nanoparticles. The maximum heat gain at the Solar irradiance of 900 W/m2 was raised up to 23% when WO3 nanoparticles were used. The proportion of the growth of the heat removable factor for nanofluids comparing to water at the same mass flux rate is between 1.05 and 1.16. The results indicated that the efficiency of the evacuated tube Solar Collector enhanced with more nanoparticles added. The thermal-optical efficiency of the evacuated tube Solar Collector reached 72.8%.
-
evacuated tube Solar Collector performance using ceo2 water nanofluid
Journal of Cleaner Production, 2018Co-Authors: M.a. Sharafeldin, Gyula GrófAbstract:Abstract Nanofluids are the most attractive mean to enhance the performance of heat transfer devices. Several types of nanoparticles were utilized as they have high thermal conductivity. Renewable energy makes use of these nanofluids special in Solar Collectors. Evacuated tube Solar Collector is one of the most utilized Solar Collectors in thermal applications. CeO2 nanoparticles were used in the presented study. The mean diameter of CeO2 was 25 nm. A stable CeO2/water was made. The stability was checked using Zeta potential machine. Experiments were carried out using three different volume concentration of CeO2 nanoparticles of 0.015%, 0.025%, and 0.035%. The thermal performance of the evacuated tube Solar Collector was examined at different mass flux rates. Results showed that the temperature difference between inlet and outlet flow and absorbed energy increase when nanofluids are used. The volume fraction flow rate of 0.035% at the mass flux rate of 0.017 kg/s.m2 had the maximum heat removable factor, the thermo-optical characteristic of the Collector, and the thermal loss coefficient. The thermo-optical characteristic of the Collector of tube Solar corrector is raised up to 34%.
M A Sharafeldi - One of the best experts on this subject based on the ideXlab platform.
-
evacuated tube Solar Collector performance using copper nanofluid energy and environmental analysis
Applied Thermal Engineering, 2019Co-Authors: Gyula Gróf, M A Sharafeldi, Eiyad Abunada, Omid MahiaAbstract:Abstract The effect of metallic copper nanoparticles on the thermal efficiency of an evacuated tube Solar Collector was studied. Different volume concentrations of copper nanoparticles e.i. 0.01%, 0.02% and 0.03% were examined to explore the effect of nanoparticles on evacuated Solar Collector performance. The tests were performed at three volume flow rates of 0.6 L/min, 0.7 L/min and 0.8 L/min. The results demonstrate a 50% increase in the output temperature. Also, the heat energy incremented from 417 W to 667 W, which is equivalent to 34% area reduction for the same energy production. The remarkable enhancement in the heat removal factor to reach a value of 0.97. Copper nanoparticles played a significant role to increase both the absorbed energy and the removal energy parameters. Their maximum values were found for a volume concentration of 0.03% and at the volume flow rate of 0.8 L/min to be 0.83 and 21.66, respectively. Finally, environmental analysis is carried out to find the role of copper nanoparticles in CO2 reduction. The comparison between current results with reported results in the literature for other types of nanoparticles, show the high potential of copper nanoparticles for Solar Collector applications.
-
efficiency of evacuated tube Solar Collector using wo3 water nanofluid
Renewable Energy, 2019Co-Authors: M A Sharafeldi, Gyula GrófAbstract:Abstract The thermal performance of the evacuated tube Solar Collector with WO3/Water Nanofluid was studied in this paper. The WO3 nanoparticles were spherical with 90 nm diameter Three different volume fraction of WO3 nanoparticles of 0.014%, 0.028%, and0.042% were examined at several mass flux rates of 0.013 kg/s.m2, 0.015 kg/s.m2 and 0.017 kg/s.m2. The stability of the nanofluid was checked. Experiments were performed in Budapest, Hungary on the latitude of 47°28′N and longitude of 19°03′E. The results showed that the temperature difference of the fluid increased up to 21% with adding WO3 nanoparticles. The maximum heat gain at the Solar irradiance of 900 W/m2 was raised up to 23% when WO3 nanoparticles were used. The proportion of the growth of the heat removable factor for nanofluids comparing to water at the same mass flux rate is between 1.05 and 1.16. The results indicated that the efficiency of the evacuated tube Solar Collector enhanced with more nanoparticles added. The thermal-optical efficiency of the evacuated tube Solar Collector reached 72.8%.
