Physical characteristics of conditioned anaerobic digested sludge – A fractal, transient and dynamic rheological viewpoint

The changes in the physical characteristics of unconditioned and conditioned anaerobic digested sludge (ADS) biosolids, such as capillary suction time (CST), yield stress, average size and fractal dimensions, were investigated through a CST test, transient and dynamic rheological test and image analysis. The results showed that the optimum polymer dose range was observed when CST or its reciprocal value was employed as an indicator. There were good correlations between the yield stresses determined from both a controlled shear stress test and a strain amplitude sweep test. The yield stress and storage modulus (G′) increased as the polymer dose increased in most cases. A frequency sweep test revealed that polymer conditioning could extend the frequency sweep ranges for their elastic behaviors over viscous behaviors as well as the gel-like structure in the linear viscoelastic range. These results implied that more deformation energy was stored in this rigid structure, and that elastic behavior became increasingly dominant with the addition of the polymer in most cases. In addition, both the average sizes and two-dimensional fractal dimensions for conditioned ADS biosolids presented a similar up-climax-down variation trend as the polymer doses increased, whereas the critical polymer doses at the highest average sizes or two-dimensional fractal dimensions, were different. Correlation analysis revealed that the conditioned ADS dewaterability was not correlated with the yield stresses, while the average sizes or the two-dimensional fractal dimensions for conditioned ADS biosolids could be taken as the indication parameters for ADS dewaterability.     

实验室建筑物空调系统节能分析

构建清洁低碳、安全高效的能源体系是当前我国重大能源总体要求。公共建筑节能是我国节能减排的重要工作之一,空调系统能耗是公共建筑能耗的主要组成部分。本文针对实验室建筑物空调采暖系统,对系统全年运行能耗的建立数学模型,分析了实验室空调系统能耗的影响因素。最终针对能耗影响因素提出了节能改进措施。为实验室空调、采暖系统的节能降耗、系统优化提供理论依据和参考方向。     

北京首都机场T2航站楼冬季室内参数实测与分析

2014年冬季供暖期间,对首都机场T2航站楼室内主要功能区相关空调设计参数进行测试,记录并分析了温度、相对湿度和风速的测试结果。测试结果表明,冬季供暖期间,航站楼室内存在温度偏高、相对湿度偏低以及外围区域受冷风侵入严重等问题。此次测试参数分布特性可为航站楼内气流组织的优化设计及空调系统调节控制提供参考意见。同时,对高大空间建筑热环境和空调设计具有一定的指导意义。     

空调的节能与环保

伴随着通讯工作的急速发展,不断增加的通讯机房投入到了建造和运用中。通讯设备不同于通常的工业设备,它需求一个严格的工作环境,对所在环境的温度、湿度、洁净度有着清晰的请求。通讯机房内的空调机组设备即是用于保护这么一个环境的必要设备。有数据显现一个通讯基站的首要电能耗费在通讯机房内置空调上,进步这些空调机组的功率是下降通讯机房电能耗费量的首要路径。因此,展开对通讯机房专用空调的节能操控研究,对工业、机械工业、通讯工业等涉及到节能操控思维的领域有主要的理论含义和实践价值。     

矩形风管局部构件与直管段气溶胶粒子沉降速度比较分析

气溶胶是影响室内空气质量的重要因素之一,室外的气溶胶粒子通过风管系统进入室内,严重危害人们的健康.本文用滑石粉模拟气溶胶粒子,对矩形风管系统(材料为镀锌钢板)的直管段、渐缩段和风阀等3个位置,测定了气溶胶粒子在不同风速和粒径下的表面沉降速度,分析了它们之间的关系.结果表明,风管断面的沉降速度随风速和粒径的增加而增加;同一风管断面上底面的沉降速度最大,侧壁面次之,顶面最小;渐缩段底面、侧壁面和顶面的沉降速度均比直管段大,风阀断面的沉降速度明显高于直管段.研究表明,风管系统底面及局部构件是积尘的主要部位,也是风管系统清洗的重点.     

环境试验室用节能型空气处理机组的研制

空调柜设置冷凝加热器,采用三通调节阀调节进入冷凝加热器的压缩机排气流量,实现调节补偿加热的功能,并替代电加热。采用信号选择器选择降温信号和除湿信号的大者控制压缩机转速,在同时保证试验室所需显冷量和潜冷量的情况下,达到最小冷冻能力输出,实现节能运行。     

洁净手术部空调系统设计

简要介绍了手术室洁净技术的国内外发展历程与现状,并在此基础上,针对河北省三河市某医院的洁净手术部的工程建设,着重介绍了其工程概况和空调系统设计,包括空调系统的构成、设计参数、主要设备的特点及运行原理。在其工程实践的基础上提出了一些改进措施和建议。