MODERATOR: Robert J. Silbey
Silbey's MIT Chemistry website
PANELISTS:
Thomas Widmer: Former Vice President, Thermo Electron, Inc.
Ernest S. Geskin: Professor of Mechanical Engineering
Director of the Waterjet Technology Laboratory, New Jersey Institute of Technology
Geskin's NJIT website
James Keck: Professor Emeritus, Department of Mechanical Engineering, MIT
Noam Lior: Professor, Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania
Lior's Penn website
Debjyoti Banerjee: Assistant Professor, Department of Mechanical Engineering, Texas A&M University
Banerjee's Texas A&M website
Richard Peterson: Associate Professor, Department of Mechanical Engineering;
Director of the Advanced Tactical Energy Systems Program, Oregon State University
Peterson's Oregon State website
Erik Ydstie: Professor, Department of Chemical Engineering, Carnegie Mellon University
Ydstie's Carnegie Mellon website
Ron Zevenhoven: Professor of Engineering Thermodynamics and Modelling, Heat Engineering Laboratory, Åbo Akademi University
Zevenhoven's Åbo website
Zhuomin Zhang: Professor, G.W. Woodruff School of Mechanical Engineering,
Georgia Institute of Technology
Zhang's Georgia Tech website
Ahmed F. Ghoniem: Ronald C. Crane (1972) Professor of Mechanical Engineering, Department of Mechanical Engineering
Ghoniem's MechE website
Seth Lloyd: Professor of Mechanical Engineering and Engineering Systems, Engineering Systems Division, MIT
Lloyd's ESD website
ABOUT THE PANEL DISCUSSION:
In this valedictory panel to the two-day symposium, 10 speakers offer brief takes on how the Second Law of Thermodynamics might prove useful in seeking answers to our current energy challenge.
Even before the oil embargo of 1973, Thomas Widmer recalls, Joe Keenan and his MIT colleagues wrote of an “entropy crisis.” They analyzed the flow of work in industries and saw great inefficiencies that became crippling when fuel prices spiked. Despite 30 years of improvement, says Widmer, “the effectiveness of energy use is still less than 12%.” In selling ideas to policy makers, he advises, talk about “energy productivity” rather than conservation.
Ernest S. Geskin doesn’t believe alternative energies will be viable quickly enough to make a serious difference in climate change, so his objective is to improve combustion. He outlines several methods he’s developing that increase the availability of generated heat, reduce heat losses, and integrate combustion with materials production and processing, such as in steelmaking.
James Keck says that “improving the efficiency and reducing emissions of auto engines and power plant burners requires an ability to model hydrocarbon combustion.” He recommends using a method “firmly based on the Second Law of Thermodynamics: the rate controlled constrained equilibrium method,” which, among other advantages, generates fewer equations, and is applicable to any separable system.
Seeking ways to make reactions more efficient and “less exergy destructive,” Noam Lior recommends a detailed, top-down methodology. His lab has been examining oil droplet and coal combustion in an attempt to understand why exergy losses take place, and to determine “which process will give us the highest exergy efficiency.”
Debjyoti Banerjee’s research focuses on enhanced cooling and explosives sensing. His lab explores phase changes for boiling and condensation, and develops new models in molecular dynamics, harnessing the energy of nanosphere transport processes. A “nanobubble” serves as a heat engine, and Banerjee is examining how “nanofins help in transferring heat.”
Richard Peterson is taking a look “at how small you might be able to make the classic thermodynamic heat engine, so you could integrate it into portable equipment or other devices requiring power, and burn fuel with much higher energy density than found in a battery.” He notes that “your efficiency takes a nosedive as you shrink the engine.”
Erik Ydstie is concerned with dynamic systems like power plants, and how they can be improved, by manipulating their inputs and outputs. By designing better controls to regulate these complex systems, there’s a “lot of scope to improve the efficiencies of these plants. You could get quite a bit of mileage by running them better.”
Ron Zevenhoven “presents the embryo of an idea: Can the infrared radiation that causes the enhanced greenhouse effect be put to better use?” He wants to see whether science can modify the infrared radiation that leaves the earth, in order to cut back on radiative forcing higher up.
Zhuomin Zhang discusses radiation entropy and how near-field thermophotovoltaic devices “may be another way of effectively using energy.” He wonders how to apply the entropy concept to near-field radiation when interference is a problem.
Ahmed Ghoniem says that while we won’t run out of cheap fossil fuels for some time, “we need to think about an insurance policy” in response to the predictions of a four to six degree rise in Earth’s temperature by the end of the century. “The dirty little secret is once you burn the fuel you automatically generate entropy -- you lose about 20% right off the bat.” Ghoniem asks whether “combustion and heat engines can be reinvented to reduce entropy generation, practically and at scale.”
NOTES ON THE VIDEO (Time Index):
Video length is 1:30:39.
Thomas Widmer begins with no introduction.
At 6:16, Ernest S. Geskin begins.
At 12:02, James Keck begins.
At 17:35, Noam Lior begins.
At 23:48, Debjyoti Banerjee begins.
At 30:17, Richard Peterson begins.
At 37:17, Erik Ydstie begins.
AT 43:32, Ron Zevenhoven begins.
At 50:07, Zhuomin Zhang begins.
AT 55:21, Ahmed Ghoniem begins.
At 1:03:10, Seth Lloyd invites questions for the panel.
At 1:25:47, Ghoniem and George Hatsopoulos make closing remarks.
The information on this page was accurate as of the day the video was added to MIT World. This video was added to MIT World on 2008-04-15.
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