Tuesday, June 27, 2017: 9:45 AM-10:45 AM
Fundamentals and Applications
Chair:
Pradeep Bansal, Ph.D., ASHRAE STBE Editorial Board
There is a strong need to develop not-in-kind technologies to replace conventional vapor compression refrigeration technology that can improve energy efficiency and environmental friendliness of residential and commercial building equipment. Such technologies will be critical to provide energy savings or other environmental benefits for space conditioning, water heating and refrigeration. This session presents material from two recently published papers from ASHRAE's archival journal, Science and Technology for the Built Environment, on the subject.
1 Elastocaloric Cooling: From Fundamental Thermodynamics to Solid State Air Conditioning
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Marvin Schmidt, Saarland University
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Susanne-Marie Kirsch, Saarland University
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Stefan Seelecke, Dr.Ing., Saarland University
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Andreas Schütze, Dr.Ing., Saarland University
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This presentation discusses fundamental thermodynamic concepts as well as experimental investigations of elastocaloric cooling processes and presents a concept of a potential elastocaloric air conditioning device. Various cooling cycles suitable for elastocaloric cooling are introduced and the process efficiencies are determined based on a graphical approach. The graphical method is validated experimentally with a specially designed scientific test setup, which enables the measurement of mechanical and thermal process quantities under various thermal boundary conditions. The results are compared with the values predicted by the graphical approach. Furthermore, a concept of a continuously operating elastocaloric air cooling device is introduced.
2 Magnetic Heat Pumps: An Overview of Design Principles and Challenges
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Paulo Trevizoli, Ph.D., University of Victoria
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Theodor Christiaanse, University of Victoria
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Premakumara Govindappa, University of Victoria
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Iman Niknia, University of Victoria
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Reed Teyber, University of Victoria
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Jader Barbosa, University of Victoria
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Andrew Rowe, Ph.D., University of Victoria
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Active magnetic regeneration is one of the most promising alternative technologies for the development of heat pumps and cooling systems for applications near room temperature. Recently, numerous papers have reported on the development of magnetocaloric materials, magnetic circuits, prototypes and cycle optimization. This presentation examines some of the main challenges encountered in the current state of the art technology. It provides an overview of how design choices impact cooling power and work requirements from a system engineering perspective.
