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 31 for “"Heat Rejection"”.
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Enhanced Ambient Heat Rejection in Passive Thermal Management Systems
… brought about new challenges in terms of ambient heat rejection. The most simple and reliable ambient heat rejection method is natural air convection. However, this technique is limited in terms of the cooling power that can be dealt with. This work presents two technologies that can potentially …
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Evaluation of Heat Rejection Strategies for Liquid Desiccant Air-Conditioning Systems
… systems that can use renewable or waste heat. One promising technology is the use of a Liquid Desiccant Air-Conditioning (LDAC). An evaporative cooling tower (ECT) was used as a cooling device to reject the heat from a LDAC at Queen’s University. Investigation of the ECT showed …
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Power plant heat rejection : reduction of cooling cycle blowdown by side stream treatment
Thesis (M.S.)--Michigan State University. Dept. of Chemical Engineering, 1975
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An investigation of the heat rejection to the engine oil in an internal combustion engine.
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1944.
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Modeling heat rejection in horizontal smooth round tubes and experimental validation for R1234ze(E), R134a and R32
Heat transfer in condensers is typically divided into 3 zones: superheated, two-phase and sub cooled region. These regions, in general, are considered to be independent of each other and various correlations are available in literature to predict the heat transfer coefficient (HTC) in these regions …
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A computer simulation of the turbocharged turocompounded diesel engine system for studies of low heat rejection engine performance
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Ocean Engineering, 1986
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Thermofluid design and performance analysis of an air-cooled heat rejection system for a 50 MWe sCO2 concentrated solar power plant
… the utility scale, and little is known about the heat rejection systems of such plants. If these plants are to be realised at a utility-scale, further research is required with regards to the process design, physical layouts, and operational philosophy of these heat rejection systems. The present …
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Development of a process modelling methodology and condition monitoring platform for air-cooled condensers
… from 25 35 − C C was investigated, with a heat rejection rate decrease of 10.9 MW and a backpressure increase of 7.79 kPa across the temperature range. Condensers' heat rejection rate decreased with higher air temperatures, while dephlegmators' heat rejection rate increased due to the …
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Design and experimental testing of metamaterial-based agitators
Due to the low heat rejection capacity or huge water consumption of traditional cooling methods, many power plants are looking for a way that is eco-friendly and high efficient but low-cost to retrofit their current cooling system. This study aims to explore innovative solutions to enhance heat …
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Design and analysis of a natural draft direct dry cooling system for a supercritical carbon dioxide power cycle for CSP application
… work, such an NDDDCS with vertically arranged heat exchangers around the tower circumference is designed and evaluated for a supercritical carbon dioxide (sCO2) power cycle for a concentrated solar power application. The system is configured to house both the precooler (PC) and intercooler (IC) …
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The influence of gravity on pressure drop and heat transfer in flow boiling
… at the present time in developing efficient heat rejection systems for use in manned spacecraft. An experimental facility has been fabricated in which heat transfer, pressure drop, and vapor volume fraction in flow boiling of R11 can be studied in vertical upflow, vertical downflow, and …
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Full-Scale Testing Of A Passively Modulated Oil-To-Air Cooler
… lubrication to components and removes the heat generated by them. Currently used lubrication systems must be designed to the worst thermal condition, ground idle, resulting in overcooling the lubricating oil across the remainder of the flight envelope. Overcooling the oil lowers the …
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Comparative study of advanced heat pumps
… thermal resistances between the device and the heat rejection or heat absorption space. A cool side temperature difference between 0 and 20{dollar}\sp\circ{dollar}C is investigated, and this temperature difference accounts for both thermal resistance and cooling load. An outside temperature …
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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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Mixed convection and heat management in the Mars gravity biosatellite
… payload thermal control system will reject heat through the base of the payload module and provide air circulation vital to maintaining a habitable environment for the mice. The centripetal acceleration due to rotation creates the tendency for heated air to move by free convection toward the …
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Low cost solar powered water pump
… on a working fluid which expands due to input heat from the sun, and contracts due to heat rejection to the pumped water. This expansion and contraction of the fluid is utilized to move flexible bellows, resulting in the pumping action. The thermodynamic and heat transfer aspects of the system …
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Implementation and evaluation of thermal avoidance strategies in arid, cost-constrained climates aimed at improving indoor thermal comfort : a case study in Bhuj, India
… emissions, energy consumption, and urban heat island effects. India is a prime example of a region where new building trends, hot climatic conditions, increasing social aspirations, and rapid population growth is likely to spread the adoption of air conditioning. To reduce the need for air …
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THERMODYNAMIC AND TRANSPORT PROPERTIES OF AVIATION TURBINE FUEL: PREDICTIVE APPROACHES USING ENTROPY SCALING GUIDED MACHINE LEARNING WITH EXPERIMENTAL VALIDATION
… generation densities, design restrictions on heat rejection, and finite heat sink capacity, fighter aircraft face significant thermal management challenges which are driving research from component to system level technology regimes. As aviation turbine fuel often represents half of the …
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Experimental and Analytical Investigation of a Two-Phase Ejector Used for Expansion Work Recovery in a Transcritical R744 Air-Conditioning System
… R744) refrigeration cycle, the supercritical heat rejection pressure can be used to maximize the system performance. In addition, large throttling losses make R744 a suitable fluid for expansion work recovery. This study presents experimental and computational results obtained from a …
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