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Showing 1 to 20 of 56 for “"Solar collectors"”.
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Sealing of partially evacuated solar solar collectors
… evacuated, high performance, hot water, solar collector proposed by Roberts (1979). The collector involves an absorber plate inside an evacuated domed glass tube, sealed by a polymer seal onto a metal endcap. The proposed collector contains 15 torr of low thermal conductivity gas to …
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LONG TERM TRANSIENT TESTING OF SOLAR COLLECTORS
The testing of solar collectors is usually carried out under a steady state weather conditions whereby the collector fluid inlet and outlet temperatures are maintained steady over the testing period. However, in the actual testing, it is difficult to obtain the steady state conditions required. …
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Parabolic trough solar collectors : design for increasing efficiency
Parabolic trough collectors are a low cost implementation of concentrated solar power technology that focuses incident sunlight onto a tube filled with a heat transfer fluid. The efficiency and cost of the parabolic trough collector designs is influenced by structural stiffness, choice of …
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Simulation and Sizing of Flat Plate Solar Collectors for Grain Drying
Flat plate solar collectors have been proven to be a feasible means of obtaining energy for low temperature grain drying systems. The objective of this study was to provide pertinent information for the design and selection of flat plate solar collectors.
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Nanofluid-based receivers for high-temperature, high-flux direct solar collectors
Solar power plants with surface receivers have low overall energy conversion efficiencies due to large emissive losses at high temperatures. Alternatively, volumetric receivers promise increased performance because solar radiation can be transferred into a fluid medium, which subsequently reduces …
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Simulation of optical impacts of gravity-induced deformations of concentrating solar collectors
Concentrating solar power (CSP) is a large field of interest in the renewable energy sector. However, CSP has not yet become as economical as other renewable energy technologies. A possible solution to this issue is the ability to produce efficient and cost-effective solar collectors such as …
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CFD Modeling and Optimization Analysis of Thermal Energy Storage Based Solar Collectors
Among various types of solar collectors, evacuated tube solar collector (ETC) has attracted much attention, especially for their application in solar water heating systems (SWHs). However, due to the intermittency in solar intensity, the ETCs may not work at their maximum functionality. In this …
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Analytical methods for evaluating two-dimensional effects in flat-plate solar collectors
… and theoretical predictions of flat-plate solar collector performance. There is a need to identify both those areas of analysis which need improvement as well as those which are already adequate. Two new methods of absorber-plate thermal analysis which can be used within the framework of …
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Investigation of performance degradation and test methods for flat-plate solar collectors
An analysis of outdoor collector performance data collected as part of the NBS Durability/Reliability Test Program is presented. The data is analyzed for consistent patterns of performance degradation resulting from prolonged outdoor exposure at low flow rate and stagnation conditions. The analysis …
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Optimisation and Parametric Study of Heat Transfer in Transpired Solar Collectors Using Computational Fluid Dynamics
Transpired Solar Collectors (TSCs) are building-integrated air-heating systems that are able to fully or partially meet the heating demands of buildings. They convert solar radiation into warm air that can either be used for ventilation, or to heat thermal storage media. TSCs are becoming an …
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Flat-Plate Solar Collectors for Water Heating with Improved Heat Transfer for Application in Climatic Conditions of the Mediterranean Region
… the thermal performance of passive flat plate solar collectors using a novel cost effective enhanced heat transfer technique. The project work focuses on the process of energy conversion from the collector to the working fluid. This is accomplished by employing an aluminium grid placed in the …
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Spectral photoluminescence for the characterization of excitation states in semiconductors and fluorescence solar collectors with manipulation of the in and out coupling of radiation
In dieser Arbeit werden Ergebnisse verschiedener experimenteller Aufbauten (z. B. winkelabhängige Photolumineszenz) vorgestellt um die Propagation von elektromagnetischer Strahlung innerhalb und außerhalb von Absorber am Beispiel von kristallinem Silizium und Fluoreszenzkollektoren mit und ohne …
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Renewable Electricity Generation via Solar-Powered Methanol Reforming: Hybrid Proton Exchange Membrane Fuel Cell Systems Based on Novel Non-Concentrating, Intermediate-Temperature Solar Collectors
… studying the capturing and conversion of solar energy. Solar thermal power systems offer a compelling opportunity for renewable energy utilization with high efficiencies and excellent cost-effectiveness. The goal of this work was to design a non-concentrating collector capable of reaching …
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Economic analysis of solar assisted absorption chiller for a commercial building
… various devices and systems to make use of solar energy for heating and cooling of building space as well as generate electric power. The most common components employed for collection of solar energy are the flat plate and evacuated tube collectors that produce hot water that can be …
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Solar Colletors Combined with Ground-Source Heat Pumps in Dwellings - Analyses of System Performance
… demand in the system, the combination with solar collectors is introduced. This system may be designed in many ways and the advantages differ a lot. Solar heat can also be used for recharging of boreholes when neighbouring boreholes are thermally influencing each other. In order to analyze …
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Performance optimization of low-to-moderate temperature thermal systems: a multi-pronged investigation
Solar energy plays a vital role for the future of clean energy production due to its availability all year round. To harvest solar energy, solar collectors are used, where they can be classified into categories of concentrating and non-concentrating solar collectors. In this work, both …
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Experimental investigations of using silica aerogel to harvest unconcetrated sunlight in a solar thermal receiver
Significant demand exists for solar thermal heat in the mid-temperature ranges (120 oC – 220 oC). Generating heat in this range requires expensive optics or vacuum systems in order to utilize the diluted solar energy flux reaching the earth’s surface. Current flat plate solar collectors have …
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Off-peak summer performance enhancement for rows of fixed solar thermal collectors using reflective surfaces
… of increasing the efficiency of fixed solar thermal collectors without greatly adding to the cost or complexity of the overall solar collection system was studied. The focus was on the use of flat mirrors, which would accomplish this goal by capturing the morning sunlight during the …
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