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- Dr. John W. Sheffield, joined Purdue University in January 2015. He holds the title of Professor Emeritus of Mechani... moreDr. John W. Sheffield, joined Purdue University in January 2015. He holds the title of Professor Emeritus of Mechanical and Aerospace Engineering from Missouri University of Science and Technology. Dr. Sheffield has a broad base of experience in energy technologies. He has served as one of the founding associate directors at the United Nations Industrial Development Organization - International Centre for Hydrogen Energy Technologies (UNIDO-ICHET) during their first two years of operation in 2005-2006. He also served as the Associate Director of the National University Transportation Center at Missouri S&T. For more than thirty years, he has served as an editor of the International Journal of Hydrogen Energy. In August 2014, he completed a two-year assignment as a principal consultant at DNV GL - Energy supporting the evaluation, measurement and verification of energy efficiency programs and the response to the U.S. DOE Uniform Methods Project Protocol review of compressed air systems. In August 2015, he completed a 7-week National Science Foundation Innovation Corps program as an industrial mentor for a potential startup company based on the manufacturing of bio-inspired bipolar plates for PEM fuel cells.edit
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Electrification of road vehicles will play a key role in the development of lower carbon transport solutions and a longer term technology is likely to include the use of hydrogen as an energy vector. This chapter discusses industrial... more
Electrification of road vehicles will play a key role in the development of lower carbon transport solutions and a longer term technology is likely to include the use of hydrogen as an energy vector. This chapter discusses industrial methods for the large-scale production and distribution of hydrogen together with the major sources of electricity production. The chemistry of hydrogen production methods is reviewed together with the challenges of storage, distribution and transport usage. Different sources of renewable electricity are discussed including wind, wave, nuclear and solar.
Enhancing thermal contact conductance by a reliable and durable coating technique, Transitional Buffering Interface (TBI), has been investigated. A phase mixed coatings, Cu/C, and pure copper coatings on both primary surfaces of specimens... more
Enhancing thermal contact conductance by a reliable and durable coating technique, Transitional Buffering Interface (TBI), has been investigated. A phase mixed coatings, Cu/C, and pure copper coatings on both primary surfaces of specimens were evaluated using four different surface roughnesses. All the samples are being tested at the following contact pressure sequence 125, 250, 375, 500, 375, 250 and 125
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This paper presents the results of an analytical and experimental examination of a latent thermal energy storage system as a part of an ongoing investigation of the thermal aspects of future spacecraft thermal management systems.... more
This paper presents the results of an analytical and experimental examination of a latent thermal energy storage system as a part of an ongoing investigation of the thermal aspects of future spacecraft thermal management systems. Experiments have been performed in a shell-and-tube heat exchanger in which eight horizontal tubes were filled with P116 (a Sun wax). An improved mathematical model, based on a one-dimensional analysis, for the freezing process was used to aid in the design of the experimental apparatus. The improved technique employs a two time level, multi-step implicit method with backward time differencing and one-sided space differencing. Comparisons of previous experimental data with predictions of the time dependent, axial distribution of the temperature of the heat transfer fluid were used to verify the technique. The solid-liquid phase front motion behavior was photographically explored by using a video cassette recording system.