The Experts below are selected from a list of 13638 Experts worldwide ranked by ideXlab platform
Brian Norton - One of the best experts on this subject based on the ideXlab platform.
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Thermal and optical consequences of the introduction of baffles into compound parabolic concentrating solar energy collector cavities
Solar Energy, 1995Co-Authors: Philip C. Eames, Brian NortonAbstract:A theoretical and experimental investigation into the modifications in optical and thermal performance resulting from the introduction of a baffle into the cavity of a compound parabolic concentrating solar energy collector has been performed. Results are presented in the form of velocity vector diagrams and isothermal plots. A comparison is made of the collector loss coefficient and Hottel-Whiller-Bliss graphs are produced for cavities with and without a baffle present. The introduction of a baffle reduces Internal Convection thereby reducing heat losses. The associated reduction in optical efficiency is small. 14 refs., 10 figs., 2 tabs.
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thermal and optical consequences of the introduction of baffles into compound parabolic concentrating solar energy collector cavities
Solar Energy, 1995Co-Authors: Philip C. Eames, Brian NortonAbstract:Abstract A theoretical and experimental investigation into the modifications in optical and thermal performance resulting from the introduction of a baffle into the cavity of a compound parabolic concentrating solar energy collector has been performed. Results are presented in the form of velocity vector diagrams and isothermal plots. A comparison is made of the collector loss coefficient and Hottel-Whiller-Bliss graphs are produced for cavities with and without a baffle present. The introduction of a baffle reduces Internal Convection thereby reducing heat losses. The associated reduction in optical efficiency is small.
Philip C. Eames - One of the best experts on this subject based on the ideXlab platform.
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Thermal and optical consequences of the introduction of baffles into compound parabolic concentrating solar energy collector cavities
Solar Energy, 1995Co-Authors: Philip C. Eames, Brian NortonAbstract:A theoretical and experimental investigation into the modifications in optical and thermal performance resulting from the introduction of a baffle into the cavity of a compound parabolic concentrating solar energy collector has been performed. Results are presented in the form of velocity vector diagrams and isothermal plots. A comparison is made of the collector loss coefficient and Hottel-Whiller-Bliss graphs are produced for cavities with and without a baffle present. The introduction of a baffle reduces Internal Convection thereby reducing heat losses. The associated reduction in optical efficiency is small. 14 refs., 10 figs., 2 tabs.
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thermal and optical consequences of the introduction of baffles into compound parabolic concentrating solar energy collector cavities
Solar Energy, 1995Co-Authors: Philip C. Eames, Brian NortonAbstract:Abstract A theoretical and experimental investigation into the modifications in optical and thermal performance resulting from the introduction of a baffle into the cavity of a compound parabolic concentrating solar energy collector has been performed. Results are presented in the form of velocity vector diagrams and isothermal plots. A comparison is made of the collector loss coefficient and Hottel-Whiller-Bliss graphs are produced for cavities with and without a baffle present. The introduction of a baffle reduces Internal Convection thereby reducing heat losses. The associated reduction in optical efficiency is small.
Tadashi Sugawara - One of the best experts on this subject based on the ideXlab platform.
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phototaxis of oil droplets comprising a caged fatty acid tightly linked to Internal Convection
ChemPhysChem, 2016Co-Authors: Kentaro Suzuki, Tadashi SugawaraAbstract:We found that novel sub-millimeter-sized photoactive oil droplets of oleic acid bearing a photolabile protecting group, 2-nitrobenzyl oleate (NBO), in basic water exhibited unidirectional motion toward a UV light source. This unidirectional motion can be explained by anisotropic photolysis on a surface of the NBO droplet with low permeability for UV light. Time-dependent changes of the movement under UV irradiation occurred in a cascade manner (still-standing, induction, and active stages). The velocity of the UV-irradiated droplet in the induction stage was small, but it was accelerated sixteen times by the presence of an inner Convection structure, which was created by continued photolysis. This characteristic dynamics, which is derived from a supramolecular machinery system towards the external stimulus, may be similar to the phototaxis of a living cell.
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fatty acid chemistry at the oil water interface self propelled oil droplets
Journal of the American Chemical Society, 2007Co-Authors: Martin M Hanczyc, Taro Toyota, Takashi Ikegami, And Norman Packard, Tadashi SugawaraAbstract:Fatty acids have been investigated as boundary structures to construct artificial cells due to their dynamic properties and phase transitions. Here we have explored the possibility that fatty acid systems also demonstrate movement. An oil phase was loaded with a fatty acid anhydride precursor and introduced to an aqueous fatty acid micelle solution. The oil droplets showed autonomous, sustained movement through the aqueous media. Internal Convection created a positive feedback loop, and the movement of the oil droplet was sustained as Convection drove fresh precursor to the surface to become hydrolyzed. As the system progressed, more surfactant was produced and some of the oil droplets transformed into supramolecular aggregates resembling multilamellar vesicles. The oil droplets also moved directionally within chemical gradients and exhibited a type of chemotaxis.
B N Prasad - One of the best experts on this subject based on the ideXlab platform.
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comparative performance analysis of cogeneration gas turbine cycle for different blade cooling means
International Journal of Thermal Sciences, 2009Co-Authors: Onkar Singh, B N PrasadAbstract:The paper compares the thermodynamic performance of MS9001 gas turbine based cogeneration cycle having a two-pressure heat recovery steam generator (HRSG) for different blade cooling means. The HRSG has a steam drum generating steam to meet coolant requirement, and a second steam drum generates steam for process heating. Gas turbine stage cooling uses open loop cooling or closed loop cooling schemes. Internal Convection cooling, film cooling and transpiration cooling techniques employing steam or air as coolants are considered for the performance evaluation of the cycle. Cogeneration cycle performance is evaluated using coolant flow requirements, plant specific work, fuel utilisation efficiency, power-to-heat-ratio, which are function of compressor pressure ratio and turbine inlet temperature, and process steam drum pressure. The maximum and minimum values of power-to-heat ratio are found with steam Internal Convection cooling and air Internal Convection cooling respectively whereas maximum and minimum values of fuel utilisation efficiency are found with steam Internal Convection cooling and closed loop steam cooling. The analysis is useful for power plant designers to select the optimum compressor pressure ratio, turbine inlet temperature, fuel utilisation efficiency, power-to-heat ratio, and appropriate cooling means for a specified value of plant specific work and process heating requirement.
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influence of different means of turbine blade cooling on the thermodynamic performance of combined cycle
Applied Thermal Engineering, 2008Co-Authors: Onkar Singh, B N PrasadAbstract:A comparative study of the influence of different means of turbine blade cooling on the thermodynamic performance of combined cycle power plant is presented. Seven schemes involving air and steam as coolants under open and closed loop cooling techniques have been studied. The open loop incorporates the Internal Convection, film and transpiration cooling techniques. Closed loop cooling includes only Internal Convection cooling. It has been found that closed loop steam cooling offers more specific work and consequently gives higher value of plant efficiency of about 60%, whereas open loop transpiration steam cooling, open loop steam Internal Convection cooling, transpiration air cooling, film steam cooling, film air, and Internal Convection air cooling have been found to yield lower values of plant efficiency in decreasing order as compared to closed loop steam cooling.
Julie Coventry - One of the best experts on this subject based on the ideXlab platform.
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An exergy analysis of tubular solar-thermal receivers with different working fluids
Energy Procedia, 2015Co-Authors: John Pye, Charles-alexis Asselineau, M. Zheng, Julie CoventryAbstract:Tubular solar thermal receivers suitable for central towers are modelled using energy and exergy analysis, in a way that allows individual inspection of the the irreversibilities associated with the various receiver heat transfer processes occurring. The model was used to compare the behaviour of four working fluids: molten salt (NaNO3/KNO3), liquid sodium metal, supercritical carbon dioxide, and ideal air. In the working fluid temperature range 300–550 °C, the model showed sodium and molten salt to be the best performers. At elevated temperature ranges, sodium and carbon dioxide become the preferred candidates. The biggest differences in exergy terms between the alternative fluids are in exergy loss by thermal emission, and in the exergy destruction associated with Internal Convection losses and wall conduction.