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Showing 1 to 15 of 15 for “"Humidifier"”.
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Design and optimization of a humidifier for an HDH system
… built to test this methodology on a packed bed humidifier. Non-dimensional entropy generation was shown to have a minimum value for varied mass flow ratio as well as for varied water inlet temperature. At its optimal performance condition, the humidifier built for this thesis has a temperature …
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Hydroxyl Radical Production via Acoustic Cavitation in Ultrasonic Humidifier Systems
Ultrasonic humidifiers use sound vibrations at frequencies higher than can be heard by humans (> 20,000 Hz) to generate aerosolized water also have potential for inducing sonochemical reactions for chemicals present in water. This research focuses on examining oxidants formed within ultrasonic …
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Aerosolization of Drinking Water Metals to Indoor Air and Assessment of Human Taste and Visual Thresholds for Manganese
… 3 is an assessment the ability of an ultrasonic humidifier to expel drinking water impurities in aerosols. The quality of the water used to charge the humidifier reservoir affects the composition of elements in the aerosols and condensate. Findings indicate condensed humidifier aerosols contain …
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Emission of Insoluble Mineral Particles from Ultrasonic Humidifiers
Ultrasonic humidifier use is a potential source of human exposure to inhalable particulates. This paper focused on the behavior of insoluble iron oxides particles, and aluminum oxide particles in ultrasonic humidifiers. 10 mg/L Fe oxide particles and 5 mg/L Al oxide suspension solutions were added …
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Experimental investigation of novel proton exchange membrane fuel cell and battery integrated system
… efficiencies. Moreover, the effect of varying humidifier temperatures on the PEM fuel cell stack is studied. The energy and exergy efficiencies of the PEM fuel cell stack are increased with increasing the humidifier temperature. The highest energy and exergy efficiencies of the developed …
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Solar-driven humidification dehumidification desalination for potable use in Haiti
… the question of whether the fills used in the humidifier of the HDH system, which allow for increased contact area between the water and air streams, can be made of locally available materials such as charcoal, bamboo, and louffa found in Haiti. It also addresses how the institutional, …
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Numerical balancing in a humidification dehumidification desalination system
… temperature and humidity profiles in both the humidifier and dehumidifier components. Numerical models are developed for several different systems, and it is shown that for a given system with fixed inputs, entropy generation is minimized by way of balancing; i.e., the extraction and …
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Assessing Human Exposure to Emissions from Ultrasonic Humidifiers
Portable ultrasonic humidifiers add moisture into room air, but they simultaneously add exposure risks of aerosolized metals from drinking water used as fill water. The inhalation exposure from emitted metals can be overlooked, and thus, co-exposure of inhalation and ingestion and co-exposure to …
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A device for the treatment of adult Sleep Apnea Syndrome
… alarm system, and the controlled humidifier of the positive-displacement pump should be incorporated within the present fanâ type Nasal Continuous Positive Airway Pressure (NCPAP) system to provide quieter, more comfortable, and safer NCPAP therapy. Before the design and …
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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
… that separates water and air phases within the humidifier and dehumidifier. The proposed model is validated by using the data which were obtained from the physical experiments. Moreover, an experimental rig was designed and fabricated to specifically generate the physical data. From the …
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Design of an axial turbine and thermodynamic analysis and testing of a K03 turbocharger
… system runs by having different pressures in the humidifier and dehumidifier. One of the components that will keep the different pressures is an expander. The expander specification is to work with a pressure ratio of 1.2 while having a high efficiency. Two approaches were developed to achieve …
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A greenhouse screening method for resistance to gray leaf spot in maize
… with high relative humidity provided by a humidifier. The first macroscopic symptoms induced by this inoculation method appeared 3 days after inoculation. This new inoculation method with mycelial discs was used on five corn genotypes (VA14, B68, PA875 , B73, and M017) to screen resistance …
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Numerical fixed-effectiveness and fixed-area models of the humidification dehumidification desalination system with air extractions and injections/
… system consisting of a packed-bed humidifier and a multi-tray bubble column dehumidifier. We look at the effect of varying the water-to-air mass flow rate ratio on the energy efficiency of the system. In addition, we study the effect of the top and bottom temperatures on the …
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DESIGN, THERMAL SIMULATION AND ECONOMIC FEASIBILITY ANALYSIS OF A PLANT FACTORY HOUSED IN A UNDERGROUND MINE DRIFT
… relative humidity setpoint is maintained by a humidifier. HVAC control strategies are developed to maximize the passive cooling and dehumidification using PV according to ambient temperature and balance points are calculated (-17.12℃ and 18.97℃ temperature for winter and summer season). …
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An Investigation of Low Temperature Direct Propane Fuel Cells
This research is directed toward the investigation of a low temperature direct propane fuel cell (DPFC). Modeling included a parametric study of a direct propane fuel cell using computational fluid dynamics (CFD), specifically FreeFem++ software. Polarization curves predicted by the CFD model were …