Performance of large fan-filter units for cleanroom applications

Fan-filter units (FFUs) are widely used in clean space to re-circulate and remove particles out of the airflows directed to cleanrooms or minienvironments. Energy and aerodynamic performance of FFUs may largely influence both energy efficiency and effectiveness in contamination control in the cleanroom design, qualifications, and operation. This article presents laboratory-measured performance of seven relatively new and large FFUs, with a section size of 122-cm×122-cm, or 4-ft×4-ft. In addition, this article includes a comparison of the performance of these large FFUs with that of smaller, 122-cm×61-cm (or 4-ft×2-ft) FFUs that were previously tested. The comparison was based upon a set of performance metrics such as total pressure efficiency (TPE) and energy performance index (EPI). This article found that there were wide variations in the energy performance of FFUs, and that using a consistent evaluation method can generate comparable FFU performance information. When operating at the maximal setting of speed control dials used to control their respective fan-wheel speeds, the larger units in this study tended to be more energy efficient than their smaller counterparts. The energy efficiency level of the same unit may vary considerably, depending on actual operating conditions such as airflow speeds and pressure rise across the units. Furthermore, this article provides recommendations for further investigations to improve energy efficiency of FFU applications.     

制药厂房百级净化区空气处理设备及系统探讨

主要介绍了制药企业百级洁净区的温度、湿度控制，以及新风补充、循环风处理系统设备的特点。     

电子厂房局部提高洁净度等级的几种方法

电子行业的生产车间由于产品的升级换代较快，产品不断更新，从而带来了一个问题，即局部洁净环境需要变更或改变。这种变更或改变，常常是温湿度要求不作调整而洁净度要求提高一个或二个等级。对此类情况，通常有一些较为实用的措施加以解决。在此，介绍几种常用的方法。     

MAU+DC+FFU净化空调系统简介

该文简要介绍电子行业洁净室净化空调系统的特点,针对目前电子行业常采用的MAU+DC+FFU净化空调系统,通过设计实例对该系统的空气处理过程进行分析与计算。     

SEW工法在广州地铁施工中的应用

在盾构法地铁隧道施工中,盾构的始发和到达是整个盾构施工中非常重要也是风险较高的环节,盾构机的始发和到达约占整个隧道施工风险的60%～70%,传统的端头施工往往加固量大,洞门凿除工作量大、事故风险高."SEW工法"是针对传统的盾构始发、到达端头加固方法所研发的一种新型的盾构始发、到达技术,成功地解决了盾构始发、到达端地层差、有管线、加固量大及洞门凿除等技术难题.该技术在广州市轨道交通5号线某区间盾构工程中成功应用,填补该项技术在国内施工技术上的空白,为全国盾构施工提供了一个新型的盾构始发、到达技术.     

基于R5F212K4单片机的单相交流FFU控制器的设计

设计了一种单相交流风机过滤单元变频调速控制器,采用瑞萨R8C系列单片机R5F212K4为控制核心,输出控制采用SPWM控制方式,实现过滤单元风机的高精度变频调速。     

IC厂房洁净系统方案介绍及比较

微电子工业迅猛发展,本文以一个典型的IC厂房为实例,介绍几种洁净设计方式,并从投资、施工、运行等方面进行分析比较。     

上海某微电子设备公司生产厂房的净化空调设计

简介了上海某微电子厂的工艺并经过经济技术比较采用一次回风加FFU空调系统。     

某百级净化间改造实例

通过某狭小空间改造千级、局部百级净化间实例,详细介绍该项目空调改造方案,以及与之相适应的装修改造及施工方案,提出采用镀锌钢板密封回风静压箱的做法。