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Showing 1 to 20 of 382 for “"collectors"”.
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Meaningful materialism : collectors relationship to their objects
… of what is being collected is established. Collectors' roles as curators and the serious and consuming aspects of collecting, including the cycles of collecting, affection and sentiment held toward collected objects, and the strategies and approaches to the process of collecting are …
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Sealing of partially evacuated solar solar collectors
… predict the loss of vacuum in the polymer sealed collectors; for various vacuum sealing polymers. It is shown that viton is the most suitable polymer, and a design of a suitable seal is shown, with the design of a completed unit. An upper limit of loss of vacuum in the collectors is demonstrated …
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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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Optimization of spodumene flotation with fatty acid collectors
… insolubility of the tall oil fatty acid (TOFA) collectors. Studies from the 1960s first reported that high density conditioning improved TOFA flotation performance, but collector properties and adsorption behaviour throughout conditioning remain poorly understood. Based on these challenges, the …
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Three dimensional modelling and optimisation of multistage collectors
Multistage collectors are commonly used in travelling wave tubes (TWTs), klystrons, gyrotrons and inductive output tubes (IOTs). A dc beam transfers some of its energy to the input RF wave during its travel through the interaction circuit. The purpose of a collector is to recover most of the …
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Sound Recordings, Private Collectors, and Academic Research Libraries
Made available in DSpace on 2014-12-13T17:49:11Z (GMT). No. of bitstreams: 1 7624082.pdf: 6905760 bytes, checksum: 5384c9376ca31d4ee769a9faf1779da8 (MD5) Previous issue date: 1976
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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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Effects of Parapets on the Performance of Unglazed Solar Collectors
… the performance of the collector. Solar thermal collectors that lack insulation or a glass covering (unglazed solar collectors) are especially susceptible. Considering the placement of these collectors on rooftops and their exposure to wind, it is imperative to examine methods for minimising this …
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Low-Concentrating, Stationary Solar Thermal Collectors for Process Heat Generation
The annual gain of stationary solar thermal collectors can be increased by non-focusing reflectors. Such concentrators make use of diffuse irradiance. A collector’s incidence angle modifier for diffuse (diffuse-IAM) accounts for this utilization. The diffuse irra-diance varies over the collector …
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Solar Wind Helium, Neon, And Argon In Genesis Aluminum Collectors
… argon implanted into two different aluminum SW collectors on board the Genesis Mission. We have conducted a diffusion experiment on a similar time scale as the Genesis mission to determine the diffusion parameters of the two different aluminum collector materials and to quantify the changes in …
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Thermal Performance Comparison of Three Integrated Thermal Solar Roof Collectors
… also compares energy performance for the three collectors on two types of evaluated houses in Roanoke, Virginia.
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A Numerical Evaluation of Thermotropic Materials for Polymer Solar Thermal Collectors
… phase change thermotropic materials for polymer collectors. The optical requirements for a thermotropic material to provide overheat protection are identified. In the clear state, high solar-weighted transmittance (≥80%, preferably ≥85%). To protect an absorber of polypropylene, material …
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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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Synergistic effects between thiol collectors used in the flotation of pyrite
… whether synergism occurs between the thiol collectors, potassium n-butyl xanthate (PNBX) and cyclohexyl dithiocarbamate (cyclohexyl DTC) when a mixture of these collectors is used in the flotation of pyrite at pH =4 and, secondly, why synergistic effects are observed, if any. The focus of …
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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
… to produce efficient and cost-effective solar collectors such as parabolic troughs, heliostats, and parabolic dishes. There are many different areas where costs can be reduced such as using cheaper materials, developing more efficient power cycles, designing better structures, reducing the …
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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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The role of collectors in the flotation of partially oxidised copper ores
… dithiocarbamates and mixtures of these collectors on the froth flotation performance of partially oxidised and oxidised copper sulphide ores were investigated in this study. More specifically, the role of the functional groups of the collectors, their dosages and the effect of collector …
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