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 38 for “"humidification"”.
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Humidification Processes in Gas Turbine Cycles
… presents a theoretical model developed for the humidification tower in an evaporative gas turbine. The developed theoretical model has been validated with measurements from experiments conducted in a 600 kWe pilot plant. This thesis presents the installation of a plate heat exchanger in the …
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Numerical balancing in a humidification dehumidification desalination system
… on the thermal and concentration balancing of a humidification dehumidification desalination system. The system operates similarly to the natural rain cycle. Seawater is heated, sprayed into an airstream to increase the air's humidity, then pure water is condensed out of the same stream in a …
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A global strategy for the deployment of humidification-dehumidification technology
The world is suffering from a severe shortage of potable water. This effect is most noticeable in third-world regions, specifically in rural Africa and Asia. In these regions, clean water exhaustion has resulted in a myriad of negative affects such as diarrhea, infant death syndrome, hepatitis, and …
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Second law analysis and optimization of humidification-dehumidification desalination cycles
Humidification-Dehumidification (HD) desalination is a thermal distillation method that has the potential to be driven using solar heating. It is a promising technology that can potentially bring safe drinking water to people of the developing world. Surprisingly, few systematic efforts have been …
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Solar-driven humidification dehumidification desalination for potable use in Haiti
… desalination technologies, such as solar-driven humidification dehumidification (HDH), are needed to help provide clean drinking water to people living in coastal areas. This thesis explores the question of whether the fills used in the humidifier of the HDH system, which allow for increased …
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Extraction based thermodynamic balancing for a humidification dehumidification desalination plant
Humidification dehumidification (HDH) desalination is a thermal driven desalination technology. One of the main issues with HDH desalination is the high energy consumption involved. The energy efficiency of thermal desalination systems is given by a non-dimensional number known as the gained output …
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Thermal design of humidification dehumidification systems for affordable and small-scale desalination
The humidification dehumidification (HDH) technology is a carrier-gas-based thermal desalination technique ideal for application in a small-scale system but, currently, has a high cost of water production (about 30 $/m³ of pure water produced). The present thesis describes fundamental contributions …
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Modelling, Simulation and Optimisation of Multistage Humidification and Dehumidification Desalination Plant Using Solar Energy. Performance Evaluation and Improvement of the Humidification-Dehumidification Desalination Process through Modelling, Simulation and Optimisation Techniques
… For this reason, a new method known as Humidification-Dehumidification (HDH) desalination process has been developed to address the challenge of water shortage. The aim of this research was to build the detailed mechanistic models with the increased capability to predict more accurately …
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Experimental Evaluation of the Effect of Inlet Gas Humidification on Fuel Cell Performance
The development and evaluation of a fuel cell test stand incorporating various methods for controlling the temperature and humidity of fuel cell reactants is described. The test stand is capable of accurately metering gas flows, controlling the temperature and humidity of the gases, and delivering …
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Saturation curve analysis of humidification-dehumidification desalination systems and analysis of reversible ejector performance
The limitations upon the efficiency of humidification-dehumidification (HDH) desalination systems are investigated. Secondly, ejector technologies are analyzed as a means of powering desalination systems thermally. Thermal desalination systems offer advantages over membrane technologies in terms of …
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Design of a mobile community level water treatment system based on Humidification Dehumidification desalination
… dimensional, solid model of the technology. This Humidification Dehumidification (HDH) based technology aims to be applied at community level water supplies, bringing clean water to those countries with inadequate water infrastructure. The mobility provided by the model would allow the HDH based …
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Entropy generation minimization of a heat and mass exchanger for use in a humidification-dehumidification desalination system
… This process is particularly relevant in humidification-dehumidification desalination systems, where minimizing entropy generation per unit water produced is critical to maximizing system performance. Control volume techniques are first employed, and shown to be ill-suited to understanding …
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Numerical fixed-effectiveness and fixed-area models of the humidification dehumidification desalination system with air extractions and injections/
The humidification dehumidification (HDH) desalination system can be advantageous in small-scale, off-grid applications. This system is very robust and can tolerate a wide range of feed salinities, making it a good candidate for treating produced water from hydraulically fractured natural gas …
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High efficiency solar air heaters with novel built-in heat storage for use in a humidification-dehumidification desalination cycle
… products. However, in the context of a Humidification-Dehumidification (HD) Desalination cycle air heating offers significant performance gains for the cycle. Solar collectors can be over 40% of an air-heated HDH system's cost, thus design optimization is crucial. Best design practices …
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Towards reliable correlation of microporous layer physical characteristics and PEMFC electrochemical performance
… fuels. During fuel cell operation, external humidification of reactant gases is typically required in order to increase PEM conductivity for improved performance. However, the use of external humidification is costly and increases system complexity. Recently it has been found that by …
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Growth and use of Carbon Nanotube Nanoforests as Gas Diffusion Layers in Industrial-Scale Proton Exchange Membrane Fuel Cells
… cell temperature, gas flow rates, reactant humidification, and water management. Water management is especially challenging involving a fine balance between adequate humidification for conductivity and flooding due to excess water. Gas diffusion layers are a component within the fuel cell …
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Development and Validation of a Dynamic Vapor Sorption -Fast Gas Chromatography Method for Studying the Effects of Humidification and Temperature on Volatile Release From Amorphous Carbohydrate Glasses
… ionization detection for studying the effects of humidification and temperature on volatile release from amorphous glasses. Uncertainty analysis was performed on the results obtained from the validation experiments. The method was also used to analyze the physicochemical and kinetic changes that …
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The design, development, and validation of an accessible high flow nasal oxygen solution with patient scoring outputs
… the Oxygen Regulator and Mixer Unit, the Humidification and Heating Unit, and the Patient Airway Device. Additionally, a Patient Vitals Acquisition Unit for acquiring patient vitals was incorporated into the system architecture. The subsystem designs were based on requirements ad …
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How many Cs in NICU?
… the physiological and historical context of humidification practices; a systematic review of randomised controlled trials that identifies a lack of research evidence to direct practice; a survey of humidification practices in NICUs across Australia and New Zealand that highlights the extent …
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Advanced controllers for building energy management systems. Advanced controllers based on traditional mathematical methods (MIMO P+I, state-space, adaptive solutions with constraints) and intelligent solutions (fuzzy logic and genetic algorithms) are investigated for humidifying, ventilating and air-conditioning applications.
… The three inputs are heating, cooling and humidification, and the 2 outputs are room air temperature and relative humidity. The external disturbances consist of climatic effects and other stochastic influences. The study is carried out within a simulation environment using the mathematical …
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