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Comparative assessments of the performances of PV/T and conventional solar plants
摘要： The building’s energy demand consists of both thermal energy and electricity that may be provided through solar energy sources. Typically, the electrical energy needs are satisfied by photovoltaic plants (PV)s, while the thermal energy needs are satisfied by solar thermal plants (ST)s. However, there is the possibility to produce simultaneously electrical and thermal energy by hybrid photovoltaic/thermal (PV/T) plants. This study presents the comparison of the performances of a hybrid photovoltaic/thermal (PV/T) plant with those of a systems made by a PV plant plus a ST plant (PV+ST). Such comparisons are interesting in those buildings where there is not enough available surface for installing both PV and ST plants as much as necessary for satisfying the energy needs of such buildings ( e.g. in residential tower buildings). This research is carried out having as target a residential unit situated in different geographic areas: Catania (IT) , Split (HR) and Freiburg (D). The outcomes of the energy analysis, calculated following the first and the second thermodynamic law approach, highlight that a PV/T plant produces more energy than a conventional solar system (PV-ST) in the three cities. Otherwise, the results of the economic analysis show that the PV plants allow to achieve the most economic benefits due to the cheaper cost of this technology.
关键词： Solar energy,economic analysis,hybrid PV/T plant,TRNSYS simulation,quality of energy,renewable energy
更新于2025-09-19 17:15:36
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Performance analysis for hybrid PV/T system using low concentration MWCNT (water-based) nanofluid
摘要： This paper presents experimental work on utilising Nano?uid as a working agent for Photovoltaic Thermal Systems (PV/T). PV/T systems are one kind of hybrid systems in energy utilisation. They convert the incident solar radiation into two energy types; electricity and heat. In this research, experimental outdoor tests were directed to assess the execution of PV/T system that utilises water-based Multi Walls Carbon Nano Tubes “MWCNT” as a heat storage/heat absorption agent. The e?ect of varying Nano?uid volume concentration ratio was studied within the range (0%:0.3%) while ?xing the circulation rate at 1.2 l/min. By analysing the experimental results, it can be noted that adding Nano Particles to the base ?uid caused the thermal properties to have a signi?cant increment leading the PV/T system to have a better thermal and electrical e?ciency. The best system e?ciencies were obtained at 0.075% V of MWCNTs – water based Nano?uid. At this concentration, a temperature reduction of 12 °C for the PV panel was attained at maximum incident radiation leading to an overall system e?ciency of 83.26%. Also, an average temperature reduction of 10.3 °C was achieved over the daytime leading to an overall e?ciency of 61.23%.
关键词： Nano?uids,MWCNT,Solar energy,Hybrid PV/T,Photovoltaic
更新于2025-09-19 17:15:36
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Progress of MWCNT, Al <sub/>2</sub> O <sub/>3</sub> , and CuO with water in enhancing the photovoltaic thermal system
摘要： Hybrid photovoltaic thermal system is an effective method to convert solar energy into electrical and thermal energy. However, its effectiveness is widely affected due to the high temperature of photovoltaic panel, and it can be minimized by employing nanofluids to the PV/T systems. In this research, the effect of various nanoparticles on the PV/T systems was studied experimentally. The nanofluids Al2O3, CuO, and multiwall carbon nanotube (MWCNT) were dispersed with water at different volume fractions of 0, 0.5, 1, 2.5, and 5 (vol%) using ultrasonication process. The effect of nanomaterials on viscosity and density was classified. All tests were carried out in an outdoor laboratory setup for calibrating the PV temperatures, thermal conductivity, electrical power, electrical efficiency, and overall efficiency. In addition, the energy analyses were also made to estimate the loss of heat owing to the nanofluids. Results show that use of the nanofluid increased the electric power and electrical efficiency of PV/T compared with water. Furthermore, MWCNT and CuO reduced the cell temperature by 19%. Consequently, the nanofluids MWCNT, Al2O3, and CuO produced the impressive values of 60%, 55%, and 52% increase in an average electrical efficiency than conventional PV. Particularly, the MWCNT produced superior results compared with other materials. It is evidently clear from the result that the introduction of the nanofluid increases the thermal efficiency without adding any extra energy to the system. Moreover, insertion of Al2O3, CuO, and MWCNT on PV/T system increases the exergy efficiency more than conventional PV module.
关键词： photovoltaic thermal system,solar energy,nanoparticles,nanofluid,exergy,hybrid PV/T collectors
更新于2025-09-12 10:27:22
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Experimental investigation and CFD analysis of a solar hybrid PV/T system for the sustainable development of the rural northern part of Bangladesh
摘要： An attempt has been made to utilise solar energy more e?ciently by developing the single pass hybrid photovoltaic thermal system at the climatic condition of Bangladesh. As the electric energy conversion e?ciency of the photovoltaic module falls with the surrounding temperature and air or water used as a suitable solution to make it cool. In this study, air was used as the cooling medium for the solar panel and circular copper tube was placed on the glazed collector for water heating to ensure maximum exploitation of solar energy. Moreover, the photovoltaic panel power was used to circulate the air and make the system self-powered. Maximum collector e?ciency was 24.64% for water and 11.20% for air is observed at a mass ?ow rate 0.00158 and 0.00221 kg/s for water and air respectively at a solar radiation of 1050 W/m2. In addition, the combined e?ciency of the hybrid system was about 39.68%. By adding glycerin with water at a ratio of 50:1 (% of weight) the combined e?ciency reached up to 45.76%. The computational ?uid dynamics (CFD) simulation and economic analysis of the designed system strongly support the feasibility of the solar hybrid photovoltaic thermal system as the future sustainable energy source.
关键词： CFD simulation,Solar energy,feasibility analysis,hybrid PV/T
更新于2025-09-09 09:28:46