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 66 for “"Condensers"”.
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Condensation in refrigeration condensers.
Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Thesis. 1972. Ph.D.
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Performance and optimization of microchannel condensers
This study is the first to document the condensation heat transfer performance of small diameter, microchannel tubes in crossflow heat exchange, and this study provides the first systematic evaluation of the effect of port shape on microchannel tube performance. Furthermore, this study is the first …
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Cyber-Resilient Control of Synchronous Condensers
… control and detection frameworks for synchronous condensers (SC). The research establishes robust exciter control algorithms that effectively address nonlinear dynamics and measurement uncertainties present in weak grid environments while simultaneously developing advanced techniques for the …
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Steam condensation in flattened-tube air-cooled condensers
Air-cooled condensers for power plants are an alternative to closed-cycle wet cooling with a condenser and cooling tower pair. Air-cooled condensers cool the process steam by forced-convection of air, replacing the water evaporation found in traditional power-plant designs. Air-cooled condensers …
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Vortex generator arrays in air-cooled condensers for power plant applications
This study presents a numerical analysis of laminar convective heat transfer in a rectangular channel with different configurations of delta-winglet vortex generators (VG). A low and high Reynolds number case of 225 and 1123 is simulated which is representative of the lower and upper limits of the …
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Separation of liquid-vapor two-phase flow in headers of microchannel condensers
… order. 1. Separation of vapor and liquid in condensers is evaluated via numerical study as a way to improve efficiency. 2. Effects of separation of vapor and liquid on condenser performance are experimentally investigated on a MAC system. 3. Experimental study of separation of vapor and …
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Heat transfer and visualization in large flattened-tube condensers with variable inclination
… correlation for condensation in air-cooled condensers. Overall, the results suggest that an improvement in steam-side heat transfer performance can be achieved by varying the tube inclination angle. Pressure drop results are presented in a companion paper.
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Manufacturing and characterization of welded, sintered condensers for a loop heat pipe
… the effects of high surface area of multiple condensers, the low thermal resistance of loop heat pipes, and the increased dissipation rates with an integrated fan system, a high efficiency heat exchanger has been previously designed. The multiplecondenser loop heat pipe required reliably …
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Development of an air-cooled, loop-type heat pipe with multiple condensers
… of a novel loop-type heat pipe with multiple condensers for a high performance air-cooled heat sink. While multiple-condenser heat pipes have been developed in the past, this heat pipe layout is the first to ensure equal operation of the individual condensers. The layout incorporates wicks in …
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Design of parallel plate condensers with sintered wicks for a loop heat pipe
… to mitigate the failure modes of parallel condensers. These results serve as guidelines for the continued development of the parallel plate condensers for the loop heat pipe integrated into the compact heat exchanger.
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Development of a process modelling methodology and condition monitoring platform for air-cooled condensers
Air-cooled condensers (ACCs) are a type of dry-cooling technology that has seen an increase in implementation globally, particularly in the power generation industry, due to its low water consumption. Unfortunately, ACC performance is susceptible to changing ambient conditions, such as dry bulb …
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Effect of inclination on pressure drop and flow regimes in large flattened-tube steam condensers
… in a large flattened tube used in air-cooled condensers (ACC) for power plants. Steam with mass flux of about 7 kg m-2 s-1 was condensed inside a 10.7 m long, flattened test tube with inclination angle varied from horizontal up to 70o. The original full-sized steel tube was cut in half along …
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Synchronous Condensers and Grid-Forming Control for the Integration of Inverter-Based Resources in Weak Grids
… the stability of IBRs by leveraging synchronous condensers (SC) and grid-forming control. First, it presents an optimization model to find the optimal location and size of SCs, aiming to minimize the total cost of SCs and maintain the strength (measured by short-circuit ratio [SCR]) above a …
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Experimental study and modeling of liquid-vapor flow in the second header of microchannel condensers with separation circuitry
… improve the effectiveness of microchannel (MC) condensers at little cost. Condenser prototypes have been designed to have the inlet in the middle of the height. After the 1st pass (multiple parallel microchannel tubes brazed together as one part by aluminum louver fins), liquid separates from …
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Design, fabrication, and characterization of a multi-condenser loop heat pipe
… electronic systems. The multi-layer stack of condensers utilizes a sintered wick design to stabilize the liquidvapor interface and prevent liquid flooding of the lower condenser layers in the presence of a gravitational head. In addition a liquid subcooler was incorporated to suppress vapor …
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Prediction of film condensation and aerosol formation in a gas-vapor mixture flow through a vertical tube
… estimating the sizes and operating conditions of condensers used for removing vapors from gas-vapor mixtures. The ability to predict the possibility of aerosol formation without expensive experimental studies makes it practical to design condensers in which aerosol formation is impossible. Three …
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Experimentally validated models of refrigerant distribution in microchannel heat exchangers used to evaluate charge reduction of various working fluids
… and discussed with focus on microchannel condensers and evaporators. Experiments with different refrigerants including R290, R717, R1234yf, and R134a are used to validate the models. The experimentally validated models are used to compare the charge of various refrigerants. The procedure …
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Scalable Micro/Nanostructured Surfaces for Thin-Film Condensation Heat Transfer Enhancement in Steam Power Plants
… over 50% of energy production globally, rely on condensers to control system-level energy efficiency. Due to the high surface energy of common heat exchanger materials, the vapor condenses by forming a continuous liquid film with low thermal conductivity (filmwise condensation), hindering heat …
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