Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"reheat"”.
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Thermal management of the thermochemical Cu-Cl cycle linked with industrial processes for hydrogen production
… first system consists of single- and multi-stage reheat Rankine cycles, a four-step thermochemical Cu-Cl cycle, and a hydrogen compression system. Systems 2 consists of a thermochemical four-step hydrogen production Cu-Cl cycle, a hydrogen compression system and a multi-stage reheat Rankine cycle. …
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Susceptibility of creep aged material to stress relief cracking during repair welding
… weld failure after welding due to hydrogen and reheat cracking. Hydrogen cracking is investigated with the use of slow strain rate tensile tests during cathodical charging the specimen with hydrogen. The phenomenon of reheat cracking is investigated with the use of high temperature tensile tests …
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A software tool for the preliminary performance modelling of central receivers and associated power cycles
… investigated the performance limits on non-reheated cycles as well as the effects of reheat and regenerative feedwater heating. The results showed expected trends of efficiency increasing with turbine inlet temperature and pressures. Also, efficiency was shown to increase asymptotically with …
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Combustion oscillations in a ducted burner
… oscillation encountered in gas turbine reheat systems, commonly referred to as reheat buzz. This thesis describes an investigation, both experimental and theoretical, of oscillatory premixed propane-air combustion in a ducted burner. A wide range of experimental techniques is employed to …
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Development and investigation of compressed air only and hybrid powering options
… stage expansion air motors. It is important to reheat the air at inter-stages, because of two reasons, namely more work can be retrieved and icing of the exhaust pipe while air cools-down during expansion is avoided. This system takes required air for regeneration from outside. The energy and …
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Heat-transfer analysis of double-pipe heat exchangers for indirect-cycle SCW NPP
… HX gives a possibility to have a single-reheat option for PT and PV SCWRs without introducing steam-reheat channels into a reactor. Similar to the current CANDU and Pressurized Water Reactor (PWR) NPPs, steam generators separate the primary loop from the secondary loop. In this way, the …
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A Case Study and Analysis of Cleanroom Energy Use
… It is revealed that cleanroom chiller and reheat power cost is approximately $103,000/yr, much higher than necessary, but also much less than the original estimate of $385,000/yr. During the data collection process, changes to the cleanroom operation were made, and some of them are seen to …
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Impact on heat rate and subsequent emissions due to varying operation of coal fired power plants
… had different combinations of the degree of reheat; the throttle temperature; throttle pressure; and condenser cooling technology. The part load response of all the models were simulated using the software.
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Conceptual design of an SOx scrubber system utilizing plant waste
… while the scrubber is operating. A comparison of reheat versus fan power to assist in flue gas removal via the stack was made. A fan which would disperse the flue gas will be more economical if the maintenance costs of the fan and the saturated plume emitted from the stack at a high velocity are …
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The influence of rough rolling conditions on austenite evolution in peritectic microalloyed plate steels
… in turn controls the austenite microstructure. Reheating and roughing simulations were conducted in a B�hr 805D deformation dilatometer using a constant austenitising temperature of 1220 �C. Different heating cycles were adopted in the reheating simulations to see the influence of heating rate …
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Development of bimodal grain structures and their effect on toughness in HSLA steel
… microalloying additions (Ti, Nb and V) were reheated to temperatures in the range 1000-1300 °C and deformed at 1110 °C and 980 °C temperatures in Gleeble 3500. The interdendritic segregation during continuous casting and the consequent inhomogeneous microalloying precipitate distributions …
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Scale formation, properties and de-scaling in steelmaking
<p>During continuous castings, reheating, and hot rolling, slab surfaces are exposed to atmospheres containing oxidizing gases which results in scale formation. Inefficient removal of the formed scale during reheating affects product surface quality. The effect of steel composition and operating …
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Investigation of effect of process parameters on multilayer builds by direct metal deposition
… build; for example, newly deposited layers will reheat previously deposited layers. The objective of this study was to provide insight into the thermal activity that occurs during the DLD process. This work focused on the effect of the deposition parameters of deposited layers on the …
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Modeling and Control of Plate Mill Processes
… with unchanged heating quality. Data from the reheat furnace no. 2 indicate that the energy consumption has not been increased by the adjustments.
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Thermoeconomic Modeling and Parametric Study of Hybrid Solid Oxide Fuel Cell – Gas Turbine – Steam Turbine Power Plants Ranging from 1.5 MWe to 10 MWe
… is used by a number of heat exchangers to preheat the air and fuel entering the fuel cell and to provide energy for district heating. The current work considers instead the possible benefits of using the exhaust gases in an HRSG in order to produce steam which drives a steam turbine for …
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EnergyPlus Simulation of Single-Coil Twin-Fan Air Conditioning System
… rigorous validation process and inclusion of reheat capabilities.
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Dual-temperature Kalina cycle for geothermal-solar hybrid power systems
… one pressure-turbine loop instead of two; using reheat between the two turbines; and investigating other plausible working fluid mixtures including hydrocarbons and refrigerants.
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Ignition Delay Times of Natural Gas/Hydrogen Blends at Elevated Pressures
… primary interest in the gas turbine market. For reheat gas turbines, understanding of the ignition delay times of high-hydrogen natural gases is important for two reasons. First, if the ignition delay time is too short, autoignition can occur in the mixer before the primary combustor. Second, the …
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The Effect of Heat Transfer on Turbine Performance
… whenever heat is transferred, or when viscous reheat occurs, the value of this heat should be set by the Joule cycle efficiency. This new understanding finally allows both the efficiency to be defined and the flow features that change it to be identified. The method also provides cooling …
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Optimisation of feedwater heaters and geothermal preheater in fossil-geothermal hybrid power plant
… conditions of a feedwater heater and geothermal preheater in a power plant that makes use of both renewable and non-renewable energy resources, where renewable energy (geothermal energy) is used to boost the power output in an environmentally sustainable way. Henceforth, a simplified model of a …
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