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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 21 for “"Compact heat exchanger"”.
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EHD Enhanced Heat Transfer in a Metallic and a Ceramic, Compact Heat Exchanger
Electrohydrodynamic (EHD) heat transfer enhancement has enormous potential to increase heat transfer rates while minimizing heat exchanger size. The aircraft industry, for one, could benefit using EHD heat transfer enhancement. Engineers can change their design approach and plan for minimal loads, …
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Investigation of mechanical behavior and microstructural characteristics of diffusion bonded 316H stainless steel for compact heat exchanger applications
Compact heat exchangers (CHX) are key components for advanced energy systems that require high heat-transfer capacity at elevated temperatures. Diffusion bonding has been an effective technique for the fabrication of joints in heat exchanger applications. However, the structural integrity of the …
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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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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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Heat Transfer Enhancement Using Tip and Junction Vortices
This research is important in compact heat exchanger design. Enhancing heat transfer can lead to smaller, more efficient heat exchangers in a broad range of applications. A simplified heat exchanger performance evaluation method is considered to explore the heat transfer benefit and pressure-drop …
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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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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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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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Design of parallel plate condensers with sintered wicks for a loop heat pipe
… a novel design and integration of a blower and a compact heat exchanger, low thermal resistance and high efficiency heat transfer can be achieved. This device combines the increased surface area of a finned geometry with the isothermal heat transfer of a heat pipe and the low speed operation of …
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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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Heat exchanger design for thermoelectric electricity generation from low temperature flue gas streams
An air-to-oil heat exchanger was modeled and optimized for use in a system utilizing a thermoelectric generator to convert low grade waste heat in flue gas streams to electricity. The NTU-effectiveness method, exergy, and thermoelectric relations were used to guide the modeling process. The …
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Previsão para o desempenho ótimo de um duplo-tubo aletado para a transferência de um calor em regime laminar
… the steady-state laminar flow and steady-state heat transfer in finned double-tube heat exchangers. Here, the fins are plane, straigh and continuous and equally spaced, fixed on the external surface of the inner tube. Two boundary conditions are discussed; in the first one, a constant and …
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Comparison of Heat Exchanger Designs for Aircraft Thermal Management Systems
… With ever increasing numbers of on-board heat sources, higher heat loads, limited and even decreasing numbers of heat sinks, integration of advanced intelligence, surveillance and reconnaissance (ISR) and directed energy weapons, requirements for survivability, the use of composite …
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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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Design, Analysis and Modeling of a Modular Navy Integrated Power and Energy Corridor Cooling System
… Preliminary analyses by Padilla et al. on heat dissipation strategies, as well as Reyes' and Chaterjee’s subsequent design proposal for a NiPEC liquid cooling system highlight the operational and maintenance challenges in cooling the system's numerous components. This thesis presents a …
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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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Vortex-enhanced heat transfer by a new delta-winglet array
Liquid-to-air and phase-change heat exchanger performance is crucial to meet efficiency standards with low cost and environmental impact in numerous end-use energy applications. Research on performance improvement of heat exchangers often focuses on the air side because transport coefficients are …
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Design and performance characterization of high power density air-cooled compact condenser heat exchangers
… fabrication, and characterization of ultra-compact air-cooled condenser heat exchangers with exceptional power density performance in excess of 100 W/cm3. This exceptional heat exchanger performance is attributed to the implementation of high-speed compressible air flow in circular …
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Thermodynamic design optimisation of an open recuperative twin-shaft solar thermal Brayton cycle with combined or exclusive reheating and intercooling
… cycle, modified accordingly to construct the reheated, intercooled and combined cases, comprises a modified cavity receiver, a counter-flow plate-type recuperator, and a pair of proprietary automotive turbochargers configured to operate as micro-turbines. An additional modified cavity receiver …
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Thermo-hydraulic study of inclined louvered fins
Heat transfer is a naturally occurring process. It is used in a multitude of technical and domestic applications such as climate control, preparation and conservation of food, production of electricity. . . As such heat transfer affects every facet of our daily lives. Over the past decades the …
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