电冰箱下蒸发管弯管自动线

本文介绍了电冰箱下蒸发管弯管自动线的机械结构、控制系统硬件结构、控制系统软件结构。该自动线具有较高的自动化水平和较强的生产能力，能适应不同规格的产品的加工生产，从而减轻工人的劳动强度，提高生产效率和产品质量，增强了产品的竞争能力。

使用微型蒸发器测定土壤蒸发的研究进展

对微型蒸发器相关的文献进行综合与分析,并对其应用进行了综述。认为微型蒸发器的材料以热容量高、导热性差的非金属材料为宜;蒸发器口径一般应大于56mm,小于150mm;深度以150～200mm为宜;安装方法还可以进一步改进。合理运用微型蒸发器可以得到更精确的观测结果。

Pressure drop of the film-enlarged tube bundles in air-water two-phase cross flow in evaporative air cooler

An experiment was carried out to investigate the relation of the maximum velocity of air passing through narrowest passage, mass flux of spray water in one square meter in one hour and the pressure drop of tube bundles. Twelve equations were obtained for the relation. The results show that the pressure drop of the tube bundles increases with increase of the maximum velocity of air and the mass flux of spray water. Comparing the pressure drop of the bare tube bundles with that of the film-enhanced tube bundles, it is found that the pressure drop of the film-enhanced tube bundles is lower about 11% and the surface roughness of the film-enhanced plates is a main factor that influences the pressure drop. The data and method obtained in the paper can be used to compute the pressure drop of the film-enhanced tube bundles and is helpful for selection of fan.