《地源热泵系统工程技术规范》修订

岩土热物性参数作为指导地埋管地源热泵系统设计和应用的关键性参数,一直以来都未能引起人们的重视。然而,随着我国地埋管地源热泵系统研究的不断深入,应用规模的不断扩大,岩土热物性参数的重要性日益凸显出来。如何正确获得岩土热物性参数,并以此指导地埋管地源热泵系统的设计,原《地源热泵系统工程技术规范》(GB50366-2005)中并没有系统的规范和约束。2009年,在原有《规范》的基础上,增加补充了岩土热响应试验方法和相关内容,明确指出应采用动态耦合计算的方法指导系统设计,并在此基础上,对相关条文进行了修订。此次修订对正确指导地埋管地源热泵系统的设计和应用具有重要意义。     

地埋管地源热泵空调系统设计案例分析

本文以具体工程为例,从地埋管地源热泵空调系统的总冷、热负荷情况、地埋管换热系统的设计分析、地埋管换热系统的设计分析、地源热泵系统的设计分析、空调系统的末端设计、系统能耗计算与运行成本等方面论述了地埋管地源热泵空调系统的设计原理。     

重庆市《地埋管地源热泵系统技术规程》解读

介绍了重庆市《地埋管地源热泵系统技术规程》的编制背景、特点并对重点条文进行了解读。《规程》在国家标准的基础上,结合重庆市气候、岩土条件特点及近年来的工程实践,对地埋管地源热泵系统工程的勘察、设计、施工及验收进行了完善,以提高重庆地埋管地源热泵系统的设计水平,实现节能减排的战略目标。     

地埋管地源热泵发展中的关键问题

介绍了地埋管地源热泵系统的优点,针对地埋管地源热泵出现的问题,重点探讨了地埋管地源热泵系统在岩土体热物性勘察、岩土体热平衡、地埋管换热器的设计与施工等方面应采取的措施。加上其他环节的紧密配合,以期为地源热泵系统健康发展提供参考。     

武汉某小区地埋管地源热泵设计及经济性分析

从冷热源设计与地埋管系统设计两方面,介绍了某工程地埋管地源热泵空调系统的技术方案,分析了冷热源的运行策略,并与传统空调系统进行了对比,为地埋管地源热泵和常规空调形式的系统选择提供了依据。     

地埋管地源热泵复合水蓄能系统方案设计及经济性分析

结合工程实例介绍了地埋管地源热泵复合水蓄能系统的应用设计,通过100%设计负荷日逐时负荷计算分析提出了地埋管地源热泵复合水蓄能系统设计思路及运行策略,并对比了无蓄能的常规地埋管地源热泵系统经济性。结果表明,该系统较无蓄能的常规地埋管地源热泵系统初投资节省约15%,年运行费用节省约38%,设备装机容量降低30%～35%,钻孔数量降低34%,地埋换热孔布置面积节省8 500m~2,经济效益显著。该研究指出了蓄能技术的应用前景,并为同类工程提供了参考和借鉴。     

重庆某办公楼复合式地源热泵系统设计

该文结合重庆某办公楼复合式地源热泵系统设计实例,对复合式地源热泵系统地埋管换热器部分的设计过程进行了分析。地温检测、管路反冲洗及泄漏检测系统的设置,确保地埋管换热器系统安全稳定运行。以上分析对今后重庆地区地源热泵系统的设计具有指导作用。     

浅谈地埋管地源热泵技术

简述了发展地源热泵的必要性,介绍了地埋管地源热泵系统的基本概念、分类、组成及工作原理,阐述了地埋管地源热泵系统在设计、施工中应重点注意的问题.     

地源热泵垂直地埋管传热性能影响因子分析

地源热泵地下换热器的设计是地源热泵系统工程应用的关键和难点,结合近几年国内外的研究成果,全面分析了管内流量、埋管深度、回填材料等因子对地埋管传热性能的影响,以期为工程应用及科学研究提供依据。     

地埋管地源热泵系统的设计概述

通过对《地源热泵系统工程技术规范》(GB50366-2005)的学习,结合规范对地埋管地源热泵系统的设计特点、设计方法及要点进行了论述,对设计应用中应注意的问题进行了阐述和探讨。     

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.