Monday, 27 June 2016: 9:45 AM-10:45 AM
Fundamentals and Applications
Chair:
Dennis O'Neal, Ph.D., P.E., Baylor University
Three papers dealing with experimental methodology and optimization of heat and mass transfer applications.
Laboratory experiments were conducted in paper one to investigate the frosting conditions for two geometrically identical air-to-air cross-flow plate exchangers.
Active mechanisms as a potential effective means to achieve the enhancement of heat and mass transfer in sorption fluids to improve the overall performance of an absorption chiller were posed in paper two.
And in paper three, the application of Robust Design Engineering Methodology (RDEM) is used to assess minimum temperature and cold mass fraction gradient for the performance of Counter flow Vortex Tube.
1.00 Optimizing Excess Air in Relation to Energy, Temperature and Reduction of Emissions of Methane Gas in a Combustion Nozzle: Using Numerical Combustion Modeling (ST-16-012)
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Ali M. Hasan, CEng, KEO International Consulting Engineers |
Optimizing the combustion performance and reduction of emissions of Methane gas by varying excess air has been and continues to be an area of interest for researchers, manufacturers and operators. With the aim of developing more energy efficient systems meeting stricter environmental emission controls. The aim of this paper is to provide a comprehensive graphical presentation for easier optimization of the combustion process in relation to; energy, temperature, and pollutants. Easy to use equations were developed with guidance on how to accurately optimize combustion.
Methodology; numerical software tools were used in analyzing injected; Methane gas and – variable excess air ratios. Emissions such as; Carbon Dioxide, Carbon Monoxide, and Nitrogen Oxides, were also recorded, and analyzed for optimum energy output versus lower emissions. .
Results; were tabulated and graphs generated. Equations were derived using industry established software tools. The accuracy of the developed equations was assessed on statistical basis. Discussions on advantages and disadvantaged on excess air are included.
2.00 Experimental Setup and Methodology on Active Mechanisms for Enhancing Heat and Mass Transfer in Sorption Fluids (RP-1462) (ST-16-013)
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Yuebin Yu, Ph.D., University of Nebraska-Lincoln |
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Ziqi Shen, University of Nebraska–Lincoln |
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Josephine Lau, Ph.D., Univ of Nebraska-Lincoln |
Enhancement of heat and mass transfer in sorption fluids coulde improve the overall performance of an absorption chiller. Active mechanisums were proposed as a potential effective means to achieve this goal. A testing facility is needed to evaluate the impact on the performance of chiller after adding an active mechanisums. The challenges we face include the fulfillment of mechanism motion to driving extra heat and mass transfer in an absorber, the measurement of related variables and the stablility & repeatability of findings. The issues come from the fact that an absorption chiller is a close-loop system with large heat exchangers, has a low inside pressure and can sustain only small pressure drop along the refrierant loop. Measures are needed to exclude the impact from the vibration to the untargeted components in the system. In this paper, we introduce the details of the lab construction methodology, including the vibator, the auxiliary water loop system, and the measuring instruments. Then, we present several examples to show the operation and testing procedure and stability. At last, the experiment plan matrix and analysis methodology are presented which will be applied in the next phase experiment. This paper provides useful information of active mechanism experiment setup and test methodology for the researchers in the same area who may conduct related work.