The Experts below are selected from a list of 29076 Experts worldwide ranked by ideXlab platform
Bingjin Shi - One of the best experts on this subject based on the ideXlab platform.
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Effects of different thermal storage tank structures on Temperature Stratification and thermal efficiency during charging
Solar Energy, 2018Co-Authors: Feifei Cao, Wanqing Zhang, Bingjin ShiAbstract:Abstract In solar water heating systems, the structures of thermal storage devices have played essential roles in the improvement of thermal charging efficiency and system performance. This article was focused on the optimization of thermal storage tanks, as well as the influences of thermal storage tank structures on the Temperature Stratification and heat storage capacity. The thermal characteristics of three shapes of thermal storage tanks were investigated and analyzed through CFD (Computational Fluid Dynamics) simulation, which were: (a) Cylindrical tank, (b) Circular truncated cone tank and (c) Spherical tank. It was observed that among the three thermal storage tanks, the spherical tank had significant symmetrical Temperature Stratification, while the truncated circular cone tank had the best Temperature Stratification and thermal charging efficiency. For the circular truncated cone tank, it was found that when the radius ratio (n) of the water tank was 0.554, it could approach the excellent characteristics of Temperature Stratification and thermal storage performance. This study could provide a theoretical basis for the structure optimization of the solar energy storage devices, as well as proving to be beneficial to the enhancement of thermal charging efficiency.
Tariq Muneer - One of the best experts on this subject based on the ideXlab platform.
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integrated collector storage solar water heater Temperature Stratification
Applied Energy, 2009Co-Authors: Celine Garnier, John Currie, Tariq MuneerAbstract:An analysis of the Temperature Stratification inside an Integrated Collector Storage Solar Water Heater (ICS-SWH) was carried out. The system takes the form of a rectangular-shaped box incorporating the solar collector and storage tank into a single unit and was optimised for simulation in Scottish weather conditions. A 3-month experimental study on the ICS-SWH was undertaken in order to provide empirical data for comparison with the computed results. Using a previously developed macro model; a number of improvements were made. The initial macro model was able to generate corresponding water bulk Temperature in the collector with a given hourly incident solar radiation, ambient Temperature and inlet water Temperature and therefore able to predict ICS-SWH performance. The new model was able to compute the bulk water Temperature variation in different SWH collectors for a given aspect ratio and the water Temperature along the height of the collector (Temperature Stratification). Computed longitudinal Temperature Stratification results obtained were found to be in close agreement with the experimental data.
J. Taulo - One of the best experts on this subject based on the ideXlab platform.
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Experimental study of Temperature Stratification in an integrated collector-storage solar water heater with two horizontal tanks
Solar Energy, 2006Co-Authors: Amos Madhlopa, R. Mgawi, J. TauloAbstract:Abstract The effect of tank-interconnection geometry on Temperature Stratification in an integrated collector–storage solar water (ICSSW) heater with two horizontal cylindrical tanks has been studied. The tanks were parallel to each other, and separated horizontally and vertically, with the lower tank fitted directly below a glass cover, and half of the upper tank insulated. In addition, a truncated parabolic concentrator was fitted below the tanks, with its focal line along the axis of the upper tank. The heater was tested outdoors with the two tanks connected in parallel (P), and S1- and S2-series configurations, with and without hot water draw-off. Water Temperature was monitored during solar collection and hot water draw-offs. For the heat charging process, it was found that only the lower tank exhibited Temperature Stratification in the P- and S1-tank modes of operation. There was satisfactory Temperature Stratification in both tanks in the S2-tank configuration. For the hot water draining process, the P-tank configuration exhibited some degree of Stratification in both tanks. A significant loss of Stratification was observed in the lower tank, with the upper tank exhibiting practical Stratification, when the system was operated in the S1-tank mode. The S2-tank interconnection maintained a satisfactory degree of Temperature Stratification in both tanks. So, the S2-tank mode of operation was most effective in promoting practical Temperature Stratification in both tanks during solar collection and hot water draw-offs. Other results are presented and discussed in this paper.
Branden Morhous - One of the best experts on this subject based on the ideXlab platform.
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Temperature Stratification from thermal diodes in solar hot water storage tank
Solar Energy, 2010Co-Authors: Jinny Rhee, Andrew Campbell, Adele Mariadass, Branden MorhousAbstract:In this brief note, we have experimentally measured the Temperature Stratification in a solar hot water storage tank resulting from a simulated solar heating load. Various modifications using a double chimney device that acts as a thermal diode were examined with the intent of maximizing Temperature Stratification. The greatest Stratification was seen with a unique thermal diode arrangement named the express-elevator design, so-called for the direct hot water path from the bottom third of the tank to the top third.
Bingfeng Yu - One of the best experts on this subject based on the ideXlab platform.
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Numerical study on Temperature Stratification in a room with underfloor air distribution system
Energy and Buildings, 2007Co-Authors: Qiongxiang Kong, Bingfeng YuAbstract:Abstract In this study, numerical prediction using computational fluid dynamics (CFD) was utilized to investigate air Temperature Stratification in a room with an underfloor air distribution (UFAD) system. The numerical modeling using CFD computation was validated with physical test in a full size experimental room with an UFAD system. The different supply air conditions and heat loads were discussed. The results show that the effect of three parameters, heat load, supply volume flux and supply air velocity, on room air Temperature would be expressed by the length scale of the floor supply jet. When the length scale increased from 0.8 to 1.56 m, the ratio of vertical Temperature difference between 2.5 and 0.1 m at the occupied zone to the difference between return and supply air Temperature decreased from 0.62 to 0.25. When there was only one local heat source in the room, there was a thermal stratified interface at the occupied zone. The interface height was about 1.42 times the length scale. The results may suggest ways to optimize UFAD design and operation.
