Design of a hydraulically driven compressive elastocaloric cooling system

Suxin QianDepartment of Refrigeration and Cryogenic Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, China;Department of Mechanical Engineering, University of Maryland, College Park, 3157 Glenn L. Martin Hall, College Park, MD20742, USA

Yunlong GengDepartment of Materials Science and Engineering, University of Maryland, College Park, MD, USA

Yi WangDepartment of Materials Science and Engineering, University of Maryland, College Park, MD, USA

Jan MuehlbauerDepartment of Mechanical Engineering, University of Maryland, College Park, 3157 Glenn L. Martin Hall, College Park, MD20742, USA

Jiazhen LingDepartment of Mechanical Engineering, University of Maryland, College Park, 3157 Glenn L. Martin Hall, College Park, MD20742, USA

Yunho HwangDepartment of Mechanical Engineering, University of Maryland, College Park, 3157 Glenn L. Martin Hall, College Park, MD20742, USACorrespondence[email protected]

Reinhard RadermacherDepartment of Mechanical Engineering, University of Maryland, College Park, 3157 Glenn L. Martin Hall, College Park, MD20742, USA

Ichiro TakeuchiDepartment of Materials Science and Engineering, University of Maryland, College Park, MD, USA

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Abstract

This article presents the design of elastocaloric cooling system driven by hydraulic actuators. Ni-Ti tubes under axial compressive loading mode are used in the system to provide cooling and heating. Those Ni-Ti tubes are enclosed in four identical beds, which are driven by two one-way hydraulic cylinders. Operated under the single-stage reverse Brayton cycle, the system achieves heat transfer and heat recovery by using a sophisticated heat transfer fluid network controlled by solenoid valves. Two novel designs to improve the system's performance based on the lessons learned from the previous studies are applied to this prototype. Preliminary test results of the material's latent heat at a specific fluid flow rate and temperature difference agree well with the results reported in the literature. System coefficient of performance of 11.0 and temperature lift of 24.6 K are estimated based on a dynamic model developed in the previous study.

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Design of a hydraulically driven compressive elastocaloric cooling system

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Design of a hydraulically driven compressive elastocaloric cooling system

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