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New 3D-Printed Plastic Heat Exchanger Shows Complex Geometries Are Possible from Additive Manufacturing

Clark School Engineers Work with Stratasys to Utilize Fused Deposition Modeling Technology in New Application

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FOR IMMEDIATE RELEASE  January 23, 2012

CONTACT:

Avram Bar-Cohen
301-405-3173
abc@umd.edu

Webbed tube heat exchanger (Clark School of Engineering)

COLLEGE PARK, Md.—The A. James Clark School of Engineering at the University of Maryland, College Park and Stratasys, Inc., announce the successful design, fabrication, and test of a Webbed Tube Heat Exchanger (WTHX), believed to be the first plastic heat exchanger made by additive manufacturing. Fabricated at the Stratasys facility in Eden Prairie, Minn., the 3D-printed WTHX promises to expand the potential applications of polymer heat exchangers to small production volumes and cost-constrained systems.

The WTHX represents the first time that a plastic heat exchanger has been manufactured through Stratasys’ Fused Deposition Modeling (FDM®) technology and used to successfully transfer heat through a polymer structure from a hot gas to a cold liquid. Room air, heated to 120 °C was cooled by building water at 27 °C, transferring nearly 65W of heat in the 500 cm³ heat exchanger.

Juan Cevallos, a Ph.D. candidate and research assistant in the Thermal Management of Photonic and Electronic Systems (TherPES) Laboratory at the Clark School’s Department of Mechanical Engineering, was responsible for testing the WTHX. Under the direction of Professor Avram Bar-Cohen–along with Professors S. K. Gupta, David Bigio, and Hugh Bruck–Cevallos has been working in collaboration with the Petroleum Institute in Abu Dhabi to advance polymer heat exchanger technology for seawater cooling of liquified natural gas processes, among other applications. The relatively high tool and assembly costs of low-volume polymer molding production led Bar-Cohen’s research team to select an additive manufacturing technology that could build complex geometries in a single step. Stratasys’ FDM technology provides that capability while using some of the strongest and most heat-resistant thermoplastics found among additive manufacturing technologies.

The WTHX geometry consists of a stack of rectangular flat plates, each containing an array of tubes that span the length of the plate and are separated by short webs. The tubular array carries the water, while the air flows in the gaps between the rectangular webbed-tube plates. The diameter of the tubes is selected to reduce the power required to pump the liquid while creating a “bumpy” surface on the gas-side that enhances heat transfer between the gas and liquid streams. Moreover, most of the heat transfer occurs directly across the thickness of the WTHX tubes, minimizing the deleterious effect of the low thermal conductivity of the polycarbonate resin.

About the A. James Clark School of Engineering

The University of Maryland’s A. James Clark School of Engineering is a premier program, ranked among the top 20 in the world. Located just a few miles from Washington, D.C., the Clark School is at the center of a constellation of high-tech companies and federal laboratories, offering students and faculty access to unique professional opportunities.

Our broad spectrum of academic programs, including the world’s only accredited undergraduate fire protection engineering program, is complemented by a vibrant entrepreneurial ecosystem, early hands-on educational experiences, and participation in national and international competitions.

The Clark School is leading research advancements in aerospace, bioengineering, robotics, nanotechnology, disaster resilience, energy and sustainability, and cybersecurity. From the universal product code to satellite radio, SMS text messaging to the implantable insulin pump, our students, faculty, and alumni are engineering life-changing innovations for millions. Learn more at www.eng.umd.edu.