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Performance improvement of a pulse tube cryocooler with a single compressor through cascade utilization of cold energy

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Frontiers in Energy 2021年第2期15卷 345-357页

作者： Xuming LIU Xiafan XU Biao YANG Xiaotong XI Liubiao CHEN Junjie WANG Yuan ZHOU Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of the Chinese Academy of Sciences Beijing 100049China

The high-frequency pulse tube cryocooler(HPTC)has been attracting increasing and widespread attention in the field of cryogenic technology because of its compact structure,low vibration,and reliable *** gas-coupled HPTC,driven by a single compressor,is currently the simplest and most compact *** HPTCs operating below 20 K,in order to obtain the mW cooling capacity,hundreds or even thousands of watts of electrical power are consumed,where radiation heat leakage accounts for a large proportion of their cooling *** this paper,based on SAGE10,a HPTC heat radiation calculation model was first established to study the effects of radiation heat leakage on apparent performance parameters(such as temperature and cooling capacity),and internal parameters(such as enthalpy flow and gas distribution)of the gas-coupled *** active thermal insulation method of cascade utilization of the cold energy of the system was proposed for the gas-coupled *** simulations indicate that the reduction of external radiation heat leakage cannot only directly increase the net cooling power,but also decrease the internal gross losses and increase the mass and acoustic power in the lower-temperature section,which further enhances the refrigeration *** numerical calculation results were verified by experiments,and the test results showed that the no-load temperature of the developed cryocooler prototype decreased from 15.1 K to 6.4 K,and the relative Carnot efficiency at 15.5 K increased from 0.029%to 0.996%when substituting the proposed active method for the traditional passive method with multi-layer thermal insulation materials.

关键词： radiation heat leakage active thermal insulation cascade utilization cold energy performance improvement cryocooler

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Influence and sensitivity analysis of thermal parameters on temperature field distribution of active thermal insulated roadway in high temperature mine

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International Journal of Coal Science & Technology 2021年第1期8卷 47-63页

作者： Weijing Yao Jianyong Pang Qinyong Ma Happiness Lyimo School of Civil Engineering and Architecture Anhui University of Science and TechnologyHuainan232001AnhuiChina Engineering Research Centre of Underground Mine Construction Ministry of EducationAnhui University of Science and TechnologyHuainan232001AnhuiChina State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan232001AnhuiChina

To study active heat insulation roadway in high temperature mines,the typical high temperature roadway of−965 m in Zhujidong Coal Mine of Anhui,China,is selected as *** ANSYS numerical simulation method is used for sensitivity analysis of heat insulation layer with different thermal conductivity and thickness,as well as surrounding rock with different thermal conductivity and temperature on a heat-adjusting zone radius,surrounding rock temperature field and wall *** results show that the heat-adjusting zone radius will entirely be in the right power index relationship to the ventilation *** in thermal conductivity and increase in thickness of insulation layer can effectively reduce the disturbance of airflow on the surrounding rock temperature,hence,beneficial for decreasing wall *** favourable trend significantly decreases with ventilation time,increase in thermal conductivity and temperature of surrounding rock,heat-adjusting zone radius,surrounding rock temperature field,and wall *** analysis shows that the thermal physical properties of surrounding rock determine the temperature distribution of the roadway,hence,temperature of surrounding rock is considered as the most sensitive factor of all influencing *** the spray layer,thermal conductivity is more sensitive,compared to *** is concluded that increase in the spray layer thickness is not as beneficial as using low thermal conductivity insulation ***,roadway preferential consideration should be given to the rocks with low temperature and thermal *** application of the insulation layer has positive significance for the thermal environment control in mine roadway,however,increase in the layer thickness without restriction has a limited effect on the thermal insulation.

关键词： High temperature mine active thermal insulation Temperature field of surrounding rock Numerical simulation Sensitivity analysis

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