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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 26 for “"Compact Heat Exchangers"”.
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A numerical study of flow and heat transfer in compact heat exchangers
… method for the calculations of flow and heat transfer in compact heat exchangers is developed in collaboration with the National Center for Supercomputing Applications. In this method, the unsteady Navier-Stokes and energy equations are solved. A linearly scalable performance of the code …
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Practical Applications of Delta Winglets in Compact Heat Exchangers with Louvered Fins
Compact heat exchangers are widely used by the automotive industry in systems that cool engine components. Louvered fin heat exchangers are used over their continuous fin counterparts because of the significant advantages they provide in heat transfer efficiency, while only causing small increases …
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Spatially Resolved Heat Transfer Studies in Louvered Fins for Compact Heat Exchangers
… the mechanisms that serve to increase heat transfer provides valuable knowledge to minimize the size and maximize the performance of compact heat exchangers. This document presents a detailed experimental heat transfer study of six scaled up louvered fin geometries that are typical of …
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Impact of alternative refrigerants on evaporator design and analysis of compact heat exchangers
… on the thermal design parameters of different heat exchangers, such as, plate fin and tube, shell and tube evaporator and compact heat exchangers. A computer code has been developed in Quick-Basic language to conduct this investigation.
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Heat Transfer Measurements and Optimization Studies Relevant to Louvered Fin Compact Heat Exchangers
A compact heat exchanger is a device used to transfer thermal energy between two or more fluids. The most extensive use of compact heat exchangers occurs in the commercial trucking industry. Most compact heat exchanger designs contain tubes carrying one fluid and external fins through which passes …
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Heat transfer and condensation of water vapour from humid air in compact heat exchangers
… thesis, an experimental and simulation study of heat transfer in water-to-air compact-plate heat exchanger is presented. A compact-plate heat exchanger made of polypropylene, in which flow pattern is maintained as counter-current, was constructed to conduct the experiments. Experiments were …
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Horizontal Two-Phase Flow of Air-Water Mixtures in Small Diameter Tubes and Compact Heat Exchangers
… flow. Also, the flow patterns that exist in a Compact Heat Exchanger were determined in order to verify or refute the assumption that the flow pattern that exists in the Compact Heat Exchanger is an intimate mixture of the two phases with both the gas and the liquid travelling at the same …
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Enhancing the heat transfer performance of compact heat exchangers by minimizing the contact resistance between fins and tubes
… phenomena. It plays a significant role in heat transfer applications such as electronic packaging and nuclear reactors. This parameter also appears in fin-tube heat exchangers; however, it is often neglected in the performance calculations of heat exchangers. This thesis project explores …
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Longitudinal Vortex Generation to Enhance the Performance of Compact Heat Exchangers: Flow and Heat Transfer Behavior for Plain and Interrupted Fins
… implementation of a VG-enhanced multi-louver heat exchanger. The heat transfer and pressure drop performance under both dry- and wet-surface conditions were determined through wind-tunnel experiments. Average heat transfer enhancements of 21% for dry conditions and 23% for wet conditions are …
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Air-side condensate management: Drainage channels in heat exchangers
… on the air-side surface of flat-tube air-cooling heat exchangers can result in several adverse effects on the overall thermal-hydraulic performance. In order to improve the performance of compact heat exchangers under wet-surface conditions, promoting the drainage of condensed water is critical. …
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Development of a Minichannel Compact Primary Heat Exchanger for a Molten Salt Reactor
… now allow for new components, such as heat exchangers, to be created for the next generation of MSR's and molten salt-cooled reactors. The primary (fuel salt-to-secondary salt) heat exchanger (PHX) design is shown here to make dramatic improvements over traditional shell-and-tube heat …
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Measurements and Predictions of the Heat Transfer at the Tube-Fin Junction for Louvered Fin Heat Exchangers
Compact heat exchangers are usually characterized by a large heat transfer surface per unit of volume. These characteristics are useful when thermal energy between two or more fluids must be exchanged without mixing. Most compact heat exchangers are liquid-to-air heat exchangers, with approximately …
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Unsteady Flow Behaviors Generated by Three-Dimensional Lattice Geometries as Measured by Laser Doppler Velocimetry
… relation between flow stream turbulence and heat transfer has been known for a long time, that the heat transfer rate is increased if the turbulence or fluctuation level of the flow increases. Open cell foams and compact heat exchangers are two of the most common models applied for heat …
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Achieving high efficiency thermoelectric heating and cooling with metal foam heat exchangers
… examines the development of a high efficiency heat pump system using thermoelectric (TE) and reticulated metal foam (RMF) technologies to power a vehicle`s battery thermal management system. The focus is split into two areas: first a review of TE’s sourcing or removing heat, second an …
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Design, analysis and optimization of the power conversion system for the Modular Pebble Bed Reactor System
… of controllable helium turbomachinery and compact heat exchangers are thus the critical enabling technology for the gas turbine cycle. The development of an initial reference design for an indirect helium cycle has been accomplished with the overriding constraint that this design could be …
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Flow and Heat Transfer in Microchannels 30 to 300 Microns in Hydraulic Diameter
Fluid flow and heat transfer in microchannels are very important in various fields, including miniature thermal systems, compact heat exchangers and electronics cooling. The purpose of this investigation is to contribute to this new research area through carefully designed and well controlled …
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Effects of Louver Length and Vortex Generators to Augment Tube Wall Heat Transfer in Louvered Fin Heat Exchangers
There are several different types of compact heat exchangers used in applications where small size and weight are required. One particular type of compact heat exchanger, the louvered fin heat exchanger, has been used heavily in the automotive and air conditioning industries. Over the last several …
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Flow, Heat Transfer, and Pressure Drop Interactions in Louvered-Fin Arrays
In many compact heat exchangers, interrupted-fin surfaces are used to enhance air-side heat transfer performance. One of the most common interrupted surfaces is the louvered fin. The goal of this work is to develop a better understanding of the flow and its influence on heat transfer and pressure …
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Investigation of heat transfer in metal-foam tubes
… foams attract increasing attention in making compact heat exchangers due to its advanced thermal properties. In this project, the performance of forced convection and flow boiling heat transfer in metal-foam tubes has been investigated experimentally and theoretically. Compared to those of …
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The design of a compact integral medium size PWR : the CIRIS
… increasing the power density in the core and heat exchangers. IRIS was designed with 8 Once-Through Helically coiled Steam Generators (OTHSG), located in an annulus near the vessel in the region above the core. The unit size dictates the vessel diameter, or limits the core size for fixed …
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