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Studying and Designing of the Refrigeration System in the Hundred-meter Level Cold Dielectric HTS Cable

Author: ZhangYunZuo
Tutor: GuPingDao；ZongZuoHua
School: Donghua University
Course: Heating , Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: HTS Helium refrigeration system Liquid nitrogen flow Thermodynamic Analysis
CLC: TM249.7
Type: Master's thesis
Year: 2011
Downloads: 74
Quote: 0
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Abstract


Since the discovery of high-temperature superconductors (HTS), the possibility of application of HTS power has been strongly attracted to the industrialized countries. It seems from the current rapid development of application of HTS power cable may first widely used in the power system. And compared to conventional cable, high-temperature superconducting cable has the advantages of small size, light weight, low loss and transmission capacity, high-temperature superconducting cable to transmit electricity to solve urban high power density, shortage of land to build the best transmission program has broad market prospects. The high temperature superconducting cable is one of the important applications of high-temperature superconducting technology, which integrates multidisciplinary technical of superconducting materials, cables, cryogenic refrigeration, power engineering. This paper describes the experimental content of the 30-meter high-temperature superconducting cable system design as well as the main equipment of the refrigeration system, energy as well as the experimental results of the cryogenic system analysis. Compare the pros and cons of the various low temperature refrigeration systems, through comparative analysis and various domestic and international operation, research, and study the progress of the domestic and foreign large helium refrigeration system, the choice of the helium refrigeration system to achieve the cooling capacity of the project, choose to make the initial establishment of programs for the entire one hundred meters-class high-temperature superconducting cables refrigeration system. Thermodynamic analysis and optimization of the parameters of each state point to one hundred meters stage high-temperature superconducting cables, each of the cooling stage and the heat exchanger of the refrigeration cycle, the heat balance analysis, given the design parameters of each state point, and give a the helium refrigeration cycle performance indicators and irreversible loss. These all the results of the analysis of the refrigeration cycle refrigerator design, the main refrigerator equipment such as heat exchangers, compressor, expander, valve, cryogenic liquid nitrogen pump, buffer tank and other design, selection parameters from in thermodynamic analysis to optimize the results. In this paper, the key equipment of the helium refrigeration system, such as screw compressors, plate-fin heat exchanger, expander, cryogenic liquid nitrogen pump, control valve, buffer tank, the selection and design exposition made. Screw compressor characteristics, performance evaluation, the organization of the process of screw compressors and screw compressors design selection parameters. The cold plate-fin heat exchanger design, including fin selection, channel allocation, the calculation of the heat transfer coefficient and resistance, heat exchanger area calculated. Also discusses several factors that affect the efficiency of the heat exchanger. This section also gives the turbine expansion machine and the cryogenic liquid pump and vacuum pump design parameters and the design results. Finally, and explain the role and works of the buffer tank. This thesis is based on the one hundred meters class of high-temperature superconducting cable design of the refrigeration system is the main contents given helium refrigeration system design and related calculations, the hope of one hundred meters level low temperature of high-temperature superconducting cable system do a certain amount of the contribution.

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CLC: > Industrial Technology > Electrotechnical > Electrical materials > Conductive materials and their products > Special Cable > Superconductor cable
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