Predictors of summertime heat index levels in New York City apartments

During heat waves, fatal overexposure to heat most often occurs at home. It is not known how factors such as building size, floor level, and different types of air conditioning (AC) contribute to excess indoor heat. We monitored indoor temperature and humidity in 36 apartments in New York City during summers 2014 and 2015 and used these values to calculate the indoor heat index (HI). We investigated the role of AC type and building‐level factors on indoor HI using multilevel regression models. Thirty‐four of 36 homes had AC. Central and ductless AC types were associated with the coolest indoor conditions; homes with window and portable AC were significantly warmer. Apartments on the top floor of a building were significantly hotter during heat advisory periods than other apartments regardless of the presence of AC. High indoor HI levels persisted in some homes for approximately 1 day following the end of the two heat advisory periods. We provide concrete evidence of higher heat levels in top floor apartments and in homes with certain types of AC. High heat levels that persist indoors after outdoor heat has subsided may present an underappreciated public health risk.     

烟气脱硫装置改造解析

鉴于烟气脱硫装置没有硫酸铵产出、烟气排放不达标,分析装置存在的问题,采取改变加氨位置,用滴度来控制加氨量,增加氧化空气量等措施后,取得了明显的效果。     

An experimental analysis on the evolution of the transient tip penetration in reacting Diesel sprays

Schlieren imaging has helped deeply characterize the behavior of Diesel spray when injected into an oxygen-free ambient. However, when considering the transient penetration of the reacting spray after autoignition, i.e. the Diesel flame, few studies have been found in literature. Differences among optical setups as well as among experimental conditions have not allowed clear conclusions to be drawn on this issue. Furthermore, soot radiation may have a strong effect on the image quality, which cannot be neglected.     

三种常用建筑外窗气密性能的对比分析

近年来,国家大力发展建筑节能门窗,气密性能是其中重要的一项参数。通过大量实验对比,分析比较了近两年来市场上常见的三种窗型(木窗、铝合金窗、塑钢窗)对于气密性能的大体规律,并尝试找出改善气密性能的一些方法。     

Effect of Delays in Afterheat Removal on Consequences of Massive Air Ingress Accidents in High-Temperature Gas Cooled Reactors

Massive ingress of air into the core of a high-temperature gas cooled reactor is among the accidents with a low occurrence frequency, but there are still gaps in understanding with respect to its consequences. In the present paper, massive air ingress combined with a delayed start of the afterheat removal system is investigated and compared to air ingress, accidents with normal operation of the afterheat removal procedure. A computer programme REACT/THERMIX used for these accident analyses is described. For a high-temperature gas cooled reactor with a pebble bed core, it is shown that massive air ingress has no real safety endangering consequences even if the operation of the afterheat removal system is delayed by 6 h.     

乳化液及空气吹扫装置在冷轧单机架中的应用

介绍了吹扫系统中两个关键工艺参数,分析了乳化液喷射梁、防缠导板的结构特点和功能,最后介绍了乳化液及空气吹扫装置在单机架六辊冷轧中的具体应用。     

Fuzzy logic control of a reverse flow reactor for catalytic oxidation of ventilation air methane

Fuzzy logic controllers of type-1 and type-2 were implemented to deal with the high nonlinearities and uncertainties in operation of a reverse flow reactor (RFR) for catalytic oxidation of ventilation air methane (VAM). The results indicated that the fuzzy logic controller is distinctly superior to the traditional logic-based controller and works well under the conditions with high nonlinearities and uncertainties. Owing to the robustness of RFR and particular control aim of regulating bed temperature within a relatively broad range, a fuzzy logic controller of type-1 is sufficient to cope with the uncertainty brought by the extensive variation of VAM concentration.     

Internet of Things cloud enabled MISSENARD index measurement for indoor occupants

Thermal comfort is an important factor in human body. It can seriously impact on the livelihood factors of human such as lifestyle, productivity, societal activity, and health of an individual. It holds tremendous adverse affect toward diminishing of tolerance to other environmental hazards too. In this paper, an Internet of Things based cloud enabled measurement of MISSENARD index is proposed. A prototype system is implemented based on the proposed novel architecture for measuring thermal comfort of the indoor occupants. The system is developed to apprehend the Internet of Things based multiple cloud services as an important enabler for conferring to MISSENARD index monitoring in real time. The developed system holds a novel way of smarter integration of sensor fueled data analytics with cloud supported visualization at the same time. It further validates the usability of several plug-ins, different Application Programming Interfaces (API), heterogeneous network communications, and low power, memory constrained yet cost effective processor altogether to testify the underlying theory of Internet of Things to become prevalent into a reality.     

基于PLC和UT55A的空调性能测试实验室设计

针对传统的空调性能测试系统(焓差室)测试变量多样性、编程的繁琐性、数据实时监控的不便性及系统设计的复杂性等问题,提出了基于PLC和UT55A的空调性能测试系统。系统以Lab VIEW为管理控制中心,以PLC作为辅助管理控制器,用MX100和WT330作为数据采集器,同时采用UT55A对室内室外温湿度进行实时检测控制。通过典型的三层网络将所有设备有机结合到一起,完成了集中管理与分散控制的功能。系统在满足GB/T 7725的基础上,实现了集中高效的变量管控,友好直观的界面操作,快速稳定的系统开发,实时远程的系统监控等目的。