论文部分内容阅读
研制了一台在一维、径向、稳态传热条件下测定管状保冷材料低温表观导热系数的防护端头型微机监控装置，该装置由本体、液氮自动输入系统、液氮蒸发量测量系统、温度自动监控系统及抽真空系统等５大部分组成。装置具有自动输液、自动检测及控制温度等多种功能。由于分散式数据检测器ＩＭＰ３５９５１Ｃ和３５９５１Ｄ的应用；使得该装置具有漂移小、波动小、反应快及精度高等特点，其总体误差不超过３．０５％，该装置的研制成功为保冷材料及结构的导热系数测试提供了有效的手段。对泡沫玻璃、聚氨酯泡沫塑料和聚乙烯泡沫塑等３种保冷材料进行了低温表观导热系数测定，在国内首次给出了此３种常用保冷材料的低温表观导热系数曲线、为保冷工程的设计、选材提供了可靠的数据。
A tip-end microcomputer monitoring device for measuring the apparent thermal conductivity of tubular cold-preservation materials under the conditions of one-dimensional, radial and steady heat transfer was developed. The device consists of a main body, liquid nitrogen automatic input system, liquid nitrogen evaporation Measurement system, automatic temperature monitoring system and vacuum system 5 most of the components. Device with automatic infusion, automatic detection and control of temperature and other functions. Due to the application of decentralized data detector IMP35951C and 35951D, the device has the advantages of small drift, small fluctuation, fast response and high precision, with an overall error of not more than 3.05%. The device has been successfully developed for cold-proof materials and structures Thermal conductivity test provides an effective means. The low-temperature apparent thermal conductivity of three kinds of cold-preservation materials, such as foam glass, polyurethane foam and polyethylene foam, were measured. The low-temperature apparent thermal conductivity curve of the three common cold-keeping materials was given for the first time in China. Design, material selection provides reliable data.