瞬时蒸发法制备Bi薄膜的微观结构及电输运性能

用瞬时蒸发法在加热到453K的玻璃基体上沉积出了厚度在40-160nm的多晶Bi纳米薄膜。用X射线衍射(XRD)、场发射扫描电子显微术(FE-SEM)分析了薄膜的相结构和表面形貌。在300-350K研究了薄膜厚度与电阻率的关系,随着薄膜厚度增加,电阻率并不是单调减小;随着温度增加,电阻率减小。温度在300K时,Bi薄膜的电阻率在0.36-0.46mΩ·cm之间变化。随着薄膜厚度的增加,Seebeck系数增加。电子浓度、迁移率与薄膜厚度的关系表明薄膜的电输运性能随薄膜厚度的变化而波动。

瞬时蒸发特性对LPG雾化性能的影响

依据LPG沸点低的特点,在FIRE8.42软件平台下建立瞬时蒸发模型,模拟LPG自由喷雾过程,得到LPG缸内直接喷射的油滴尺寸、温度以及油滴的贯穿距等参数的特性。通过与试验结果对比,表明瞬时蒸发模型符合实际情况。

从除盐水角度研究节能降耗

通过对某电厂汽轮发电机组除盐水使用情况的分析,抓住关键,采取措施,从对设备整治和系统优化等角度减少工质及热量损失,同时在行业内率先引入"平稳补水率"和"锅炉瞬时蒸发总量"的概念,并运用该二项指标导出了无计量装置的汽暖、制冷机、定期排污、机组方式切换等的耗水率和瞬时耗水量,对于提高机组运行经济性和对标精细化管理具有积极的借鉴意义。

LPG发动机缸内直喷、雾化过程仿真分析

燃料的喷射、雾化是发动机燃烧的重要过程,它们最终要影响到发动机经济性能和排放性能。对于汽油机和柴油机,目前国内外已经进行了大量研究,而针对LPG直喷发动机的研究还不多。为此,依据LPG沸点低的特点,在FIRE8.42软件平台下采用瞬时蒸发模型对LPG缸内直接喷射发动机喷射、雾化过程进行仿真,得到LPG缸内直接喷射的油滴尺寸、温度以及油滴的贯穿距等参数的特性。

Theoretical Study and Performance Analysis of an Adsorption Chiller

The thermodynamic cycle for an adsorption system is presented inp-T diagram. In order to investigate the performance of the adsorption system, a lumped parameter transient model of the chiller is developed, in order to predict the behaviors of the adsorption chiller system and find the influence of working conditions on its operation. For the working process of the main components of the system, including adsorber, condenser and evaporator, the coupled unsteady equations were set up for each stage. The model was then solved using stable numerical methods from EES （equation engineering solver）, and the performance of the adsorber and condenser/evaporator of the system was analyzed. The condensation, evaporation and adsorber temperature values as well as the adsorption ratio and desorption ratio were obtained as function of operating time. Also, the coefficient of performance was analyzed in function of the heat source temperature and the cooling source temperature.