The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform
Tuan Quoc Tran - One of the best experts on this subject based on the ideXlab platform.
-
impact of faults on the Efficiency Curve of flat plate solar collectors a numerical analysis
Journal of Cleaner Production, 2019Co-Authors: Gaelle Faure, Mathieu Vallee, Cedric Paulus, Tuan Quoc TranAbstract:Abstract Thermal solar energy is one of the promising cleaner ways to produce heat. In particular, large scale solar thermal systems (LSTS) can produce low-cost heat for use in district heating networks or industrial processes. However, return on investment is based to long-term reliable operation, and automatically detecting dysfunctions is desirable in these systems. Existing fault detection and diagnosis methods are applicable on many components in such a system, but the impact of faults on solar collectors received little attention. In this paper, the impact of three different faults on solar collectors is analyzed: the « transparent cover failure » fault, the «opacification » fault and the « insulation degradation » fault. To perform this analysis, a numerical model covering both normal and faulty operation is proposed. The model can be tailored to a given solar collector based only on datasheet parameters, and the experimental validation shows a good accuracy, without any calibration, both in normal and faulty operation. This model is used to study in detail the impact of the three studied faults on the solar collector Efficiency Curve. The results show that some assumptions made in previous work can be challenged, while other are validated for a wider range of conditions thanks to the model presented in this paper.
Cisdi C - One of the best experts on this subject based on the ideXlab platform.
-
Numerical simulation of separation effect of a rotational flow sedimentation tank
2005Co-Authors: Cisdi CAbstract:LUENT simulation software was used to simulate numerically the solid-liquid separation Efficiency and sludge deposition problem at a certain kind of rotational flow sedimentation tank. The sedimentation character inside this sedimentation tank was researched, a separation Efficiency Curve was obtained and the reasons that cause the sludge deposition around the suction well has been found. These conclusions are valuable to the further improvement in the design of the rotational flow sedimentation tank.
Fabio Corona - One of the best experts on this subject based on the ideXlab platform.
-
limits of advisability for master slave configuration of dc ac converters in photovoltaic systems
IEEE Journal of Photovoltaics, 2012Co-Authors: Filippo Spertino, Fabio Corona, P Di LeoAbstract:Several feed-in tariffs are now available for photovoltaic (PV) systems, and thus, the maximization of the productivity is very important; this goal can be achieved by solar cell technologies with high Efficiency and low temperature losses, one axis or dual axis sun-tracking systems, proper cooling techniques for PV modules in building integrated applications, master-slave (M-S) control for the inverters in large grid-connected PV plants, etc. About the last item, this paper deals with the advisability of the master-slave concept versus the centralized inverter layout. Here, attention is focused on the influence of the installation site with its irradiation peculiarities, the tilt angle of the PV modules, the Efficiency Curve of the inverters, and the number of slaves. The simulated productions put into evidence energy gains up to 4% per year, considering the only cloudy-day contribution. On the basis of these comparisons, the M-S concept can be profitable if the number of cloudy days is sufficiently high, the tilt angle is adequate, and the dc-ac Efficiency Curve is “well shaped”.
-
Limits of Advisability for Master–Slave Configuration of DC–AC Converters in Photovoltaic Systems
IEEE Journal of Photovoltaics, 2012Co-Authors: Filippo Spertino, Fabio CoronaAbstract:Several feed-in tariffs are now available for photovoltaic (PV) systems, and thus, the maximization of the productivity is very important; this goal can be achieved by solar cell technologies with high Efficiency and low temperature losses, one axis or dual axis sun-tracking systems, proper cooling techniques for PV modules in building integrated applications, master-slave (M-S) control for the inverters in large grid-connected PV plants, etc. About the last item, this paper deals with the advisability of the master-slave concept versus the centralized inverter layout. Here, attention is focused on the influence of the installation site with its irradiation peculiarities, the tilt angle of the PV modules, the Efficiency Curve of the inverters, and the number of slaves. The simulated productions put into evidence energy gains up to 4% per year, considering the only cloudy-day contribution. On the basis of these comparisons, the M-S concept can be profitable if the number of cloudy days is sufficiently high, the tilt angle is adequate, and the dc-ac Efficiency Curve is “well shaped”.
Zhang Yongdong - One of the best experts on this subject based on the ideXlab platform.
-
Numerical simulation of separation effect on traditional and new type rotational flow sedimentation tank
Mining & Processing Equipment, 2009Co-Authors: Zhang YongdongAbstract:Based on the FLUENT CFD simulation software,the numerical models on the traditional and new type rotational flow sedimentation tank were set up and simulated,and the separation Efficiency Curve and accumulation Efficiency Curve were obtained.After analyzing,the deposition characteristics of ferric oxide particles inside the two flow sedimentation tanks were shown. These results provide a theoretical basis for the further improvement of the new type rotational flow sedimentation tank.
Gaelle Faure - One of the best experts on this subject based on the ideXlab platform.
-
impact of faults on the Efficiency Curve of flat plate solar collectors a numerical analysis
Journal of Cleaner Production, 2019Co-Authors: Gaelle Faure, Mathieu Vallee, Cedric Paulus, Tuan Quoc TranAbstract:Abstract Thermal solar energy is one of the promising cleaner ways to produce heat. In particular, large scale solar thermal systems (LSTS) can produce low-cost heat for use in district heating networks or industrial processes. However, return on investment is based to long-term reliable operation, and automatically detecting dysfunctions is desirable in these systems. Existing fault detection and diagnosis methods are applicable on many components in such a system, but the impact of faults on solar collectors received little attention. In this paper, the impact of three different faults on solar collectors is analyzed: the « transparent cover failure » fault, the «opacification » fault and the « insulation degradation » fault. To perform this analysis, a numerical model covering both normal and faulty operation is proposed. The model can be tailored to a given solar collector based only on datasheet parameters, and the experimental validation shows a good accuracy, without any calibration, both in normal and faulty operation. This model is used to study in detail the impact of the three studied faults on the solar collector Efficiency Curve. The results show that some assumptions made in previous work can be challenged, while other are validated for a wider range of conditions thanks to the model presented in this paper.
