Abstract:
Development of ultra-high temperature heat exchangers is critical to achieve higher thermal efficiency. Recent developments in material processing and manufacturing have made it possible to introduce heat exchanger technology with unprecedented performance at acceptable cost. ORNL team has been leading first of its kind effort in this regard where the focus is to design and develop of a low-cost high temperature, (>900 C) ceramic/steel alloy heat exchanger for natural gas based modular power generation systems. The overall goal of the project is to demonstrate the heat transfer surfaces developed through advanced modeling and topology optimization in order to maximize the thermal-hydraulic performance. The resulting heat exchanger profiles have been fabricated using advanced 3D printing technology and the performance has been evaluated under the expected operating conditions. The innovative approach has enabled the realization of high-temperature heat exchangers at dramatically lower cost than is currently possible via traditional materials and manufacturing technologies.
Biography:
Dr. Nawaz is Research and Development Staff at Energy and Transportation Science Division of Oak Ridge National Laboratory. He received an MS and PhD in mechanical engineering from University of Illinois at Urbana Champaign during 2010 and 2013 respectively. His research interests include heat and mass transfer through porous media, two-phase flow, electronics cooling, micro/nano scale transport phenomena and alternative refrigerants. He is an associate member of ASHRAE, ASME and AIAA. Before joining ORNL, Dr. Nawaz has worked as senior heat transfer engineer at the Heat Transfer Center of Excellence (HTCoE) of Johnson controls Inc. In his present role at ORNL he is actively engaged in the research related to Heat exchanger design, Separate Sensible and Latent Cooling Systems, Dehumidification, Enhanced phase change processes, low GWP refrigerants and water heating. He has more than 30 publications in fundamental and applied thermal-fluid science.
Host: Professor Nenad Miljkovic
