DEVELOPMENT OF A NOVEL ROTARY MAGNETIC REFRIGERATOR

摘要

A novel rotary magnetic refrigerator was designed and built at the Federal University of Santa Catarinarn(UFSC). The optimally designed magnetic circuit is a two-pole system in a rotor-stator configuration withrnhigh flux density regions of approximately 1 T. Eight pairs of stationary regenerator beds filled withrnapproximately 1.7 kg of gadolinium, Gd, spheres (425-600 μm diameter) were placed in the magnetic gap.rnTwo low-friction rotary valves were developed to synchronize the hydraulic and magnetic cycles. The valvesrnwere positioned at the hot end to avoid heat generation in the cold end. In this work, experimental results arernpresented as a function of the operating frequency, fluid flow rate, hot reservoir temperature and thermalrnload. The performance of the device was evaluated in terms of the coefficient of performance (COP) and thernoverall second-law efficiency (