七氟丙烷气体灭火系统在工程中的应用

主要对七氟丙烷气体灭火系统的灭火机理和系统组成进行了分析,并且结合工程实例,阐述了选择七氟丙烷气体灭火系统的原因,并给出七氟丙烷组合灭火系统的计算和应用,从而推广七氟丙烷气体灭火系统在工程中的应用。     

广州兴进消防设备有限公司产品介绍

<正>1管网七氟丙烷灭火装置1.1概述七氟丙烷自动灭火系统是集气体灭火、自动控制及火灾探测等于一体的现代化智能型自动灭火装置。由广州兴进消防设备有限公司生产的ZM70L,ZM100L,ZM120L,ZM150L(4.2MPa)管网七氟丙烷灭火装置(见图1)符合DBJ15-23-1999《七氟丙烷(HFC-227ea)洁净气体灭火系统设计规范》及ISO     

密闭腔室内高压七氟丙烷喷放与局部过冷研究

摘 要：针对高压七氟丙烷气体喷放行为,建立了密闭腔室高压气体小孔喷射动态发展与演化模型,基于数值分析研究了高压七氟丙烷小孔喷射过程中的组分场、温度场和速度场等特性,并开展了相应喷放试验研究。计算结果表明,七氟丙烷喷射后易形成气体回卷,继而在障碍物靠近喷射口一侧形成七氟丙烷稀薄区域。七氟丙烷发生意外喷射时,尽管在喷口附近产生的最低温度低至-20 ℃,当七氟丙烷喷射口距离电子设备超过1.75 m时,则相应的低温影响往往在可接受范围。     

七氟丙烷气体灭火系统优化设计及维护保养

对七氟丙烷气体灭火系统应用中如何优化设计进行探讨,并进行计算验证。介绍了七氟丙烷气体灭火系统的主要部件功能及系统整体保养方法,针对系统的维护保养及应用现状,提出模拟操作系统新概念。     

七氟丙烷气体灭火装置

正1概述七氟丙烷气体灭火装置分为悬挂式七氟丙烷气体灭火装置(见图1)、(无管网)柜式七氟丙烷气体灭火装置(见图2)、4.2 MPa和5.6 MPa(有管网)七氟丙烷灭火设备(见图3)。产品型号:(1)悬挂式七氟丙烷气体灭火装置XQMC10(20,30)/1.6-PL,XQQW10(20,30)/1.6-PL;(2)柜式七氟丙烷气体灭火装置GQQ40(70,90,100,     

杭州新纪元消防科技有限公司产品介绍

<正>1七氟丙烷灭火系统1.1概述由杭州新纪元消防科技有限公司精心研制开发的ZH系列七氟丙烷自动灭火系统(见图1)设计合理、先进,关键部位采用新材料,产品性能可靠,其主要指标达到国内领先水平。各项指标均符合经国家固定灭火系统技术委员会审查的Q/HSB 07-2001《七氟丙烷(HFC-227ea)洁净气体灭火系统》企业标准和GA400-2002《气体灭火系统零部件性能要求和试验方     

备压式七氟丙烷灭火系统应用中存在的问题

在分析储压式七氟丙烷灭火系统存在的问题基础上,阐述备压式七氟丙烷灭火系统产生的原因及必要性。并将备压式七氟丙烷与储压式七氟丙烷系统在设计参数、计算方法等方面进行比较。从设计计算方法、确定喷头的最低工作压力、灭火剂开始喷放时间、驱动气体的用量、组合分配系统中如何保证各防护区的实际喷放浓度达到规定要求等方面指出备压式七氟丙烷应用中存在的一些问题,并提出改进建议。     

七氟丙烷(HFC-227ea)灭火系统

七氟丙烷(又称FM200)是洁净气体灭火剂,ZYJ—100是新研制的七氟丙烷灭火系统,该文介绍了系统的组成、系统使用维护等内容,并附计算实例。     

七氟丙烷（HFC—227ea）灭火系统

七氟丙烷（又称FM200）是洁净气体灭火剂,ZYJ－100是新研制的七氟丙烷灭火系统,该文介绍了系统的组成、系统使用维护等内容,并附计算实例。     

七氟丙烷灭火系统的应用及施工问题初探

本文主要通过介绍七氟丙烷气体灭火系统的特点、应用范围及有关功能原理,结合现场的施工经验,分析了七氟丙烷气体灭火系统在设计和施工过程中应注意的问题,提供读者参考。     

浅析高速公路工程招投标中的最低评标价法

结合目前高速公路施工项目招投标活动的实际情况,阐述了最低评标价法的概念,归纳了其优点及存在问题,对完善最低评标价法提出几点策略,以期促进招标投标市场更加规范有序。     

Place-Making in Megaprojects in Melbourne

This article analyses state-led place-making practices in Melbourne. The two levels of government that influence planning in Melbourne make much of the city as ‘culturally vibrant’ and ‘creative’, and have incorporated creative city-inspired place-making principles into many layers of the planning system. An examination of the development of two mixed-use megaprojects in central Melbourne reveals however that ideals of culturally engaging public places, and indeed of creative landscapes for middle-class consumption, wither in the face of more basic imperatives for economic development. In these case studies the ‘creative city’, no matter how the idea is interpreted, has little traction either as a set of inclusive place-making principles or as a gentrification strategy. The article concludes that the creative city-inspired place-making objectives in the planning system at both state and local levels are ambiguous in their overall intents and completely unsupported by statutory controls. Such place-making objectives as are realised are the compromised results of the interplay of uncoordinated decisions, delivered at the pleasure of the developer.     

Pathogens in septage in Vietnam

Septage is widely acknowledged as a major source of infectious pathogens while disposal of septage, and the operation and maintenance of septic tanks, is not regulated in many developing countries. Twenty untreated septage and septage sludge samples were taken from Can Tho City, Vietnam to examine their pathogen content, and indicator micro-organisms. Escherichia coli and Enterococcus spp. were detected in all samples, regardless of sludge storage time. Phages were detected in 80% of samples. Salmonella spp. were detected in 70% of the untreated septage and 60% of septage sludge samples. Concentrations of phages and bacteria tested in septage sludge after many years of tank storage were much higher than the expected levels. Helminth ova were present in 95% of untreated septage samples with an average of 450 ova l^− 1, and were detected in all septage sludge samples with an average of 16,000 ova l^− 1. Twelve varieties of helminth ova were identified. More helminth ova varieties in higher concentrations were found in septage than those reported from stool samples. The varieties' frequency ranged from 10% to 50% and Ascaris lumbricoides predominated. Results show that pathogens and indicator micro-organisms, especially helminth ova, accumulate in sludge. Thus helminth ova should be considered when septage sludge is treated and used for agriculture. Proper health protection measures must be applied for people handling septage.     

新时期广东城市化的新特点

新时期广东城市化出现以下特点:知识源导向、城市由单体向群体化发展、产业集群推动、政府主导自上而下的集约化发展、城镇化向城市化转变、由重“数量”发展向重“质量”发展的转变。     

在市场中实践在实践中学习在学习中进步--工程公司市场化进程的回顾与展望

近两年来，工程公司在提高市场竞争意识、推动市场化进程中做了大量工作，其中坚持走出去的方针是我们自我加压、推行加快市场化步伐的一个重要战略步骤。     

新形势下高校强化基建财务管理的探讨

在市场条件下高校基建财务人员在加强日常财务管理的同时,必须树立起高度的工作责任心,抓好事前监督、事中监督、事后监督三个环节,全面理解、贯彻执行《高等学校财务制度》,管好用好各项基本建设资金,提高基建财务管理水平,更好地完成高校各项基建任务,以有限的投资,最快的建设速度,获得最大的投资效益。     

浅谈我国工程项目建设成本控制存在的问题

结合目前我国施工企业工程项目成本管理现状,对工程项目成本管理过程中存在的问题进行了较详细的分析,并提出了一些解决问题的办法,以做好项目成本控制工作,进而增强企业经济实力。     

Experiences in radon-safe building in Finland

A study was made of radon-safe buildings in 300 Finnish low-rise residential buildings using data obtained from a questionnaire study. The study also aims at finding the main defects in design and implementation and how the guidance given on radon-safe buildings in slab-on-grade houses has been followed. According to the guidelines, the prevention of the flow of radon-bearing air from the soil into the house is recommended to be carried out through installation of aluminised bitumen felt and use of elastic sealants. Second, as a precaution perforated piping should be installed in the subsoil of the floor slab. The median indoor radon concentration in the houses was 155 Bq/m3. This is 32% lower than the median of the estimated reference values. The action level of 200 Bq/m3 was still exceeded in 40% of the houses. In most houses with slab-on-grade the prevention was based only on the installation of a sub-slab depressurisation system. Sealing was performed in a low number of houses. In 80% of houses with a sub-slab piping connected to an operating fan, radon concentration was below the action level of 200 Bq/m3. In houses with piping but no fan, the corresponding fraction was only 45%. Sub-slab piping without a fan had no remarkable effect on radon concentration. In houses with crawl-space and edge-thickened slabs, radon concentrations were low. The choice of foundation system thus significantly affects the indoor radon concentration. The importance of complete and careful sealing work should be stressed in advice and guides concerning radon prevention.     

2008年日本火灾情况

<正>1火灾总数在2008年(1～12月),日本发生的火灾总数为52 394起,与2007年相比减少了2 188起(4.0%)。这相当于平均1天大约发生143起火灾,每10min发生一起火灾。火灾类别(见表1)。     

Variation in property taxation in Tulsa

Conclusions It may be reasonably concluded from this study that the range of variation in these ratios of assessed to actual value are of a reasonable size for the great majority of cases. The frequency distribution of these sample ratios was not normal, however, as was assumed a process of this type would produce. On the other hand, the failure of the regression analysis to identify any significant variables which would explain these variations would tend to re-enforce the assumption that the fluctuations were indeed of a random nature.To sum it up in one paragraph, aside from a few extreme cases, the assessing process appears to give estimates which are more consistent than would be expected under the assumption that any errors would be of a random nature, but the regression analysis was unable to isolate any particular socioeconomic characteristics which would explain the variation which was present.Financial support for this research project was furnished by the University of Tulsa.