新型温控热管运行特性及启动过程实验研究

提出了一种新型分离式温控热管并进行了实验研究 ,该热管能够在保持传热温度变化很小的情况下自动改变传热功率来适应负荷变化的需要。实验结果表明 ,当温控热管传热功率增加 2 0 0 %时 ,热管工作温度变化小于 5 % ,温控热管的启动过程较常规热管快 ;在实验范围内 ,不凝性气充气压力越高 ,启动过程越短。

温控热管技术治理大垴梁煤矸石山自燃效果研究

大垴梁煤矸石山自燃破坏了区域生态环境,逸散出有害气体污染了周边大气。采用自主研发的温控热管技术对该矸石山自燃进行了治理。结果显示:采用温控热管治理9个月后,发火区3 m深处温度下降幅度为3℃~161℃,相比初始温度的下降比例为1.02%~39.66%,平均值为20.94%。6 m深处温度下降幅度为4℃~172℃,下降比例为0.70%~46.74%,平均值为16.85%。发火区1/3区域的温度下降超过100℃,单根温控热管影响半径约大于3 m。采用温控热管法防治煤矸石山自燃效果明显。

分离式温控热管实验研究

根据热能工程及化工领域中的某些实际需要 ,提出了一种新型分离式温控热管并进行了实验研究。该种热管能够在保持传热温度变化很小的情况下自动改变传热功率来适应负荷变化的需要。实验结果表明 ,当温控热管传热功率增加 2 0 0 %时 ,热管工作温度变化小于5 %。

分离式可变热导热管实验研究

根据热能工程及化工领域中的某些实际需要 ,提出了一种新型分离式可变热导热管并进行了实验研究。该种热管能够在保持传热温度变化很小的情况下 ,自动改变传热量来适应负荷变化的需要。实验结果表明 ,当温控热管传热功率增加 2 0 0 %时 ,热管工作温度变化小于 5 %。

Determining heating pipe temperature in greenhouse using proportional integral plus feedforward control and radial basic function neural-networks

Proportional integral plus feedforward (PI+FF) control was proposed for identifying the pipe temperature in hot water heating greenhouse. To get satisfying control result, ten coefficients must be adjusted properly. The data for training and testing the radial basic function (RBF) neural-networks model of greenhouse were collected in a 1028 m2 multi-span glasshouse. Based on this model, a method of coefficients adjustment is described in this article.

Numerical Simulations and Analyses of Temperature Control Loop Heat Pipe for Space CCD Camera

As one of the key units of space CCD camera,the temperature range and stability of CCD components affect the image's indexes.Reasonable thermal design and robust thermal control devices are needed.One kind of temperature control loop heat pipe(TCLHP) is designed,which highly meets the thermal control requirements of CCD components.In order to study the dynamic behaviors of heat and mass transfer of TCLHP,particularly in the orbital flight case,a transient numerical model is developed by using the well-established empirical correlations for flow models within three dimensional thermal modeling.The temperature control principle and details of mathematical model are presented.The model is used to study operating state,flow and heat characteristics based upon the analyses of variations of temperature,pressure and quality under different operating modes and external heat flux variations.The results indicate that TCLHP can satisfy the thermal control requirements of CCD components well,and always ensure good temperature stability and uniformity.By comparison between flight data and simulated results,it is found that the model is to be accurate to within 1℃.The model can be better used for predicting and understanding the transient performance of TCLHP.

Thermal Management Controller for Heat Source Temperature Control and Thermal Management

In many heat recovery processes,temperature control of heat source is often required to ensure safety and high efficiency of the heat source equipment.In addition,the management of recovered heat is important for the proper use of waste heat.To this aim,the concept of thermal management controller(TMC),which can vary heat transfer rate via the volume variation of non-condensable gas,was presented.Theoretical model and experimental prototype were established.Investigation shows that the prototype is effective in temperature control With water as the working fluid,the vapor temperature variation is only 1.3℃when the heating power varies from 2.5 to 10.0 kW.In variable working conditions,this TMC can automatically adjust thermal allocation to the heat consumer.