New storage system design brings hydrogen cars closer to reality-Purdue University News
April 3, 2009
WEST LAFAYETTE, Ind. -
Researchers have developed a critical part of a hydrogen storage system for cars that makes it possible to fill up a vehicle's fuel tank within five minutes with enough hydrogen to drive 300 miles.
The system uses a fine powder called metal hydride to absorb hydrogen gas. The researchers have created the system's heat exchanger, which circulates coolant through tubes and uses fins to remove heat generated as the hydrogen is absorbed by the powder.
The heat exchanger is critical because the system stops absorbing hydrogen effectively if it overheats, said Issam Mudawar, a professor of mechanical engineering who is leading the research.
"The hydride produces an enormous amount of heat," Mudawar said. "It would take a minimum of 40 minutes to fill the tank without cooling, and that would be entirely impractical."
Researchers envision a system that would enable motorists to fill their car with hydrogen within a few minutes. The hydrogen would then be used to power a fuel cell to generate electricity to drive an electric motor.
The research, funded by General Motors Corp. and directed by GM researchers Darsh Kumar, Michael Herrmann and Abbas Nazri, is based at the Hydrogen Systems Laboratory at Purdue's Maurice J. Zucrow Laboratories. In February, the team applied for three provisional patents related to this technology.
"The idea is to have a system that fills the tank and at the same time uses accessory connectors that supply coolant to extract the heat," said Mudawar, who is working with mechanical engineering graduate student Milan Visaria and Timothée Pourpoint, a research assistant professor of aeronautics and astronautics and manager of the Hydrogen Systems Laboratory. "This presented an engineering challenge because we had to figure out how to fill the fuel vessel with hydrogen quickly while also removing the heat efficiently. The problem is, nobody had ever designed this type of heat exchanger before. It's a whole new animal that we designed from scratch."
The metal hydride is contained in compartments inside the storage "pressure vessel." Hydrogen gas is pumped into the vessel at high pressure and absorbed by the powder.
"This process is reversible, meaning the hydrogen gas may be released from the metal hydride by decreasing the pressure in the storage vessel," Mudawar said. "The heat exchanger is fitted inside the hydrogen storage pressure vessel. Due to space constraints, it is essential that the heat exchanger occupy the least volume to maximize room for hydrogen storage."
Conventional automotive coolant flows through a U-shaped tube traversing the length of the pressure vessel and heat exchanger. The heat exchanger, which is made mostly of aluminum, contains a network of thin fins that provide an efficient cooling path between the metal hydride and the coolant.
"This milestone paves the way for practical on-board hydrogen storage systems that can be charged multiple times in much the same way a gasoline tank is charged today," said Kumar, a researcher at GM's Chemical & Environmental Sciences Laboratory and the GM R&D Center in Warren, Mich. "As newer and better metal hydrides are developed by research teams worldwide, the heat exchanger design will provide a ready solution for the automobile industry."
The researchers have developed the system over the past two years. Because metal hydride reacts readily with both air and moisture, the system must be assembled in an airtight chamber, Pourpoint said.
Research activities at the hydrogen laboratory involve faculty members from the schools of aeronautics and astronautics, mechanical engineering, and electrical and computer engineering.
Writer: Emil Venere, (765) 494-4709, email@example.com
Sources: Issam Mudawar, (765) 494-5705,firstname.lastname@example.org
Darsh Kumar, (586) 986-1614, email@example.com
Timothée Pourpoint, 765-494-1541, firstname.lastname@example.org
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Issam Mudawar, from left, a Purdue professor of mechanical engineering, discusses a hydrogen-storage system for cars with graduate student Milan Visaria and Timothée Pourpoint, an assistant professor of aeronautics and astronautics and manager of the Hydrogen Systems Laboratory. Researchers have created the system's heat exchanger, which is critical because it allows the system to be filled quickly. The research is funded by General Motors Corp. (Purdue News Service photo/Andrew Hancock)
A publication-quality photo is available athttp://news.uns.purdue.edu/images/+2009/mudawar-hydrogen.jpg
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- Emil Venere
- 765 494-4709
August 11, 2016
WEST LAFAYETTE, Ind. - The U.S. Department of Energy has awarded a grant to a Purdue University professor in the College of Engineering working on the characteristics of metals. Xinghang Zhang, a professor in the School of Materials Engineering, received a $450,000 grant from the federal Office of Basic Energy Sciences as the primary investigator for a three-year research project, "Deformation Mechanisms of Nanotwinned Aluminum and Binary Aluminum alloys." "This allows us to explore fundamental science on mechanical behavior of nanotwinned aluminum and could eventually lead to the design of high strength and ductile aluminum alloys," he said. Nanotwinned metals can be used in many applications because they simultaneously demonstrate high strength and high ductility, characteristics usually thought to be mutually exclusive. Deformation mechanisms describe how a metallic material can change its geometry under external force. The research will be done at the microscopic level by using a transmission electron microscope that can reveal the atomic arrangement inside aluminum. The School of Materials Engineering recently acquired an advanced transmission electron microscope for the deformation project and future research.Read Full Story