Heat Transfer Analysis of Flat Plate Air Collector
01 Nov 2019-Vol. 691, Iss: 1, pp 012075
About: This article is published in Microelectronics Systems Education.The article was published on 2019-11-01 and is currently open access. It has received None citations till now. The article focuses on the topics: Heat transfer.
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TL;DR: A survey of the various types of solar thermal collectors and applications is presented in this paper, where an analysis of the environmental problems related to the use of conventional sources of energy is presented and the benefits offered by renewable energy systems are outlined.
Abstract: In this paper a survey of the various types of solar thermal collectors and applications is presented. Initially, an analysis of the environmental problems related to the use of conventional sources of energy is presented and the benefits offered by renewable energy systems are outlined. A historical introduction into the uses of solar energy is attempted followed by a description of the various types of collectors including flat-plate, compound parabolic, evacuated tube, parabolic trough, Fresnel lens, parabolic dish and heliostat field collectors. This is followed by an optical, thermal and thermodynamic analysis of the collectors and a description of the methods used to evaluate their performance. Typical applications of the various types of collectors are presented in order to show to the reader the extent of their applicability. These include solar water heating, which comprise thermosyphon, integrated collector storage, direct and indirect systems and air systems, space heating and cooling, which comprise, space heating and service hot water, air and water systems and heat pumps, refrigeration, industrial process heat, which comprise air and water systems and steam generation systems, desalination, thermal power systems, which comprise the parabolic trough, power tower and dish systems, solar furnaces, and chemistry applications. As can be seen solar energy systems can be used for a wide range of applications and provide significant benefits, therefore, they should be used whenever possible.
2,285 citations
"Heat Transfer Analysis of Flat Plat..." refers background in this paper
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TL;DR: In this paper, a device for inserting an absorbing plate made of aluminium cans into the double-pass channel in a flat-plate solar air heater (SAH), which substantially improves the collector efficiency by increasing the fluid velocity and enhancing the heat transfer coefficient between the absorber plate and air.
Abstract: This study experimentally investigates a device for inserting an absorbing plate made of aluminium cans into the double-pass channel in a flat-plate solar air heater (SAH). This method substantially improves the collector efficiency by increasing the fluid velocity and enhancing the heat-transfer coefficient between the absorber plate and air. These types of collectors had been designed as a proposal to use aluminium materials to build absorber plates of SAHs at a suitable cost. The collector had been covered with a 4-mm single glass plate, in order to reduce convective loses to the atmosphere. Three different absorber plates had been designed and tested for experimental study. In the first type (Type I), cans had been staggered as zigzag on absorber plate, while in Type II they were arranged in order. Type III is a flat plate (without cans). Experiments had been performed for air mass flow rates of 0.03 kg/s and 0.05 kg/s. The highest efficiency had been obtained for Type I at 0.05 kg/s. Also, comparison between the thermal efficiency of the SAH tested in this study with the ones reported in the literature had been presented, and a good agreement had been found.
254 citations
"Heat Transfer Analysis of Flat Plat..." refers background in this paper
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TL;DR: In this paper, a design study has been made of three basic construction types, to which various modifications are made, such as heat-transfer coeficients between the absorber plate and the air stream, selective and non-selective surfaces on the absorbber plate, and natural convection barriers between the plate and ambient air.
Abstract: Solar air heaters can be used for many purposes, including crop drying, space heating, and for regenerating dehumidfying agents. Because of their inherent simplicity, they also offer the possibility of providing cheap, low-grade heat, at temperatures up to 100 deg F above ambient. There are many possible designs for solar air heaters, from the point of view of both materials and configurations. These in turn lead to a variety of costs and collection efficiencies. A design study has been made of three basic construction types, to which various modifications are made. These modifications include various heat-transfer coeficients between the absorber plate and the air stream, selective and non-selective surfaces on the absorber plate, and natural convection barriers between the plate and ambient air. Collection efficiencies have been computed for the various designs for a range of operating temperatures. The calculations show that these heaters can be built to provide air at 100 deg F above ambient, at collection efficiencies of 50 percent or more.
126 citations
"Heat Transfer Analysis of Flat Plat..." refers background in this paper
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TL;DR: In this article, a solar air heater, comprising two absorber systems in a single flat-plate collector, was designed on the principles of psychrometry, and integrated to a drying chamber for food dehydration.
Abstract: Development of appropriate technologies for conversion of solar radiation to thermal energy is essential for food preservation. A solar air heater, comprising two absorber systems in a single flat-plate collector, was designed on the principles of psychrometry. The heater was integrated to a drying chamber for food dehydration. This collector design offered flexibility in manual adjustment of the thermal characteristics of the solar dryer. The performance of the dryer was evaluated by drying fresh samples of mango (Mangifera indicus). Both fresh and dried mango samples were analysed for moisture content (MC), pH and ascorbic acid. During the dehydration period, meteorological measurements were made. The air heater converted up to 21.3% of solar radiation to thermal power, and raised the temperature of the drying air from about 31.7 °C to 40.1 °C around noon. The dryer reduced the MC of sliced fresh mangoes from about 85% (w/w) to 13% (w/w) on wet basis, and retained 74% of ascorbic acid. It was found that the dryer was suitable for preservation of mangoes and other fresh foods.
94 citations
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TL;DR: In this paper, the authors developed generalized correlations for heat transfer coefficient and friction factor for air flowing through the bed of wire mesh screen matrix packed in the solar air heater duct in a cross flow arrangement.
Abstract: Experimental investigations into heat transfer and fluid flow characteristics of a solar air heater having its duct packed with wire mesh screen matrices were carried out. The investigations covered a wide range of geometrical parameters of wire mesh screen matrix (wire diameter, pitch and number of layers). Generalized correlations have been developed for heat transfer coefficient and friction factor for air flowing through the bed of wire mesh screen matrix packed in the solar air heater duct in a cross flow arrangement.
Correlations developed for Colburn J-factor and and friction factor indicate that heat transfer coefficient and friction factor are strong functions of geometrical parameters of matrices. These correlations have been found to predict the experimental data with reasonable accuracy.
80 citations
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