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Development of a cryogen-free dilution refrigerator

Chinese Physics B 2022年第12期31卷 146-154页

作者： Zhongqing Ji Jie Fan Jing Dong Yongbo Bian Zhi-Gang Cheng Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

With thermal fluctuation strongly suppressed,low temperature environment is essential for studies of condensed matter physics and developments of quantum ***-low temperature below 20 m K has demonstrated its importance and significance in physical sciences and information *** refrigeration is by far the best feasible and reliable method to generate and keep lattice temperature in this *** a potential shortage of helium supply,cryogen-free dilution refrigerator(CFDR),eliminating the necessity of regular helium refill,becomes the main facility for the purpose of creating ultralow temperature *** we describe our successful construction of a CFDR which reached a base temperature of around 10.9 m K for continuous circulation and 8.6 m K for single-shot *** describe its operating mechanism and the designs of key components,especially some unique designs including heat switch and alumina thermal *** improvements in the future are also discussed.

关键词： cryogen-free dilution refrigerator heat exchanger cooling power helium

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Performance Prediction of a Multi-Stage Wind Tower for Indoor cooling

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Journal of Thermal Science 2012年第4期21卷 327-335页

作者： Roy J. Issa Byungik Chang Department of Engineering and Computer Science West Texas A&M University Canyon

A theoretical model is developed to establish an indepth understanding of the performance of a three-stage wind tower with a bypass system for indoor cooling in rural dry and hot climates. Model simulations are presented for a wide range of ambient conditions that include inlet wind speed, inlet temperature and relative humidity. Simulation results provide an insight into the desirable water flow rates and air-to-water loadings for comfort zone tem-peratures and relative humidity levels at the exit of the wind tower. Simulations show wind towers with variable cross-sections provide an increase in the cooling power for the same inlet wind speed, inlet air temperature and relative humidity when compared to wind towers with a constant cross-section. The study shall lead to a better understanding to designing wind towers that are both environmentally friendly and energy efficient.

关键词： Wind tower cooling power cooling effectiveness Relative humidity

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Tunable nano Peltier cooling device from geometric effects using a single graphene nanoribbon

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Frontiers of physics 2014年第4期9卷 472-476页

作者： Wan-Ju Li Dao-Xin Yao E. W. Carlson Department of Physics Purdue University West Lafayette IN 47907 USA State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-Sen University Guangzhou 510275 China

Based on the phenomenon of curvature-induced doping in graphene we propose a class of Peltier cooling devices, produced by geometrical effects, without gating. We show how a graphene nanorib- bon laid on an array of curved nano cylinders can be used to create a targeted and tunable cooling device. Using two different approaches, the Nonequilibrium Green＇s Function （NEGF） method and experimental inputs, we predict that the cooling kW/cm2, on par with the best known techniques power of such a device can approach the order of using standard superlattice structures. The structure proposed here helps pave the way toward designing graphene electronics which use geometry rather than gating to control devices.

关键词： Peltier cooling device graphene nanoribbon superlattice structure grapheneelectronics cooling power Nonequilibrium Green's Function (NI3GE)

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