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1问题提出本刊2011年第5期发表了《热的传播方向——对热力学第二定律的修正》[1]一文,文中提出:"现代物理学的基本理论‘热量不能自动地从低温物体传向高温物体’是错误的.""热量的传递,与温度的高低并没有直接关系,热 相似文献
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Anders Eriksen D. Osinski D. R. Hjelme 《上海大学学报(英文版)》2014,(1):88-94
We have carried out at laboratory test to study the feasibility of using thermal radiation detectors for online thermal monitoring of electrical systems in wind turbines. A 25 kW frequency converter is instrumented with a thermal camera, operating in the 8-14 μm wave- length range, and a single-pixel thermopile sensor, operating in the 4-8 μm wavelength range, to monitor the temperature development of the power electronics under various load sequences. Both systems performed satisfactorily with insignificant temperature deviations when compared to data from calibrated point contact sensor. With spatial averaging over a 7 mm × 7 mm for the camera and temporal averaging over 60 s for the thermo- pile sensor, we reduce the root mean square noise to 45 mK and 68 mK respectively. The low cost and simple operation of the thermopile sensor make it very attractive for condition monitoring applications, whereas the attractive feature of the camera is the possibility of multi-point or distributed temperature measurements. 相似文献
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为了查明烟头引燃棉被发生的深层次原因以及火灾发展、蔓延的过程,本文采用模拟研究的方法,采用热辐射通量计、热电偶、DV等实验工具,对香烟引燃棉被及沿床燃烧蔓延过程进行实验,通过记录所得到的数据,应用火灾科学、系统安全理论,对烟头引燃棉被的火灾事故进行过程分析和原因调查,并以此为依据,对类似的火灾事故提出科学的参考建议. 相似文献
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地暖的大面积推广与应用,必将引起采暖的革命。使采暖方式发生根本性的变化,推动供暖事业的蓬勃发展。使21世纪人民生活质量得以全面提高。 相似文献