共查询到20条相似文献,搜索用时 62 毫秒
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《建筑热能通风空调》2016,(6)
针对办公类建筑模拟分析了围护结构热惰性、间歇模式等因素对房间空气温度和热负荷特性的影响,并根据间歇热负荷变化特点给出间歇采暖热负荷系数,用于简化热负荷计算。研究结果表明:相同热阻条件下,围护结构为重质材料的房间平均热负荷较轻质的减小约5%,对于间歇时长不定的建筑建议选择重质围护结构;间歇时长由11 h增至15 h,每增一小时南向房间平均热负荷增加约1~2 W/m2、北向房间增加约2~3 W/m2;间歇采暖模式北向房间热负荷系数为1.2~1.5,南向房间为1~1.35;采暖周期内建议预热1~2 h,分两个时间段以不同热负荷系数对办公建筑供暖。 相似文献
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刘婷婷 《土木建筑与环境工程》2015,37(Z1):51-56
高校建筑具有很大的节能空间,本文运用TRANSYS-17能耗模拟软件对北京市某高校教学楼采暖期能耗进行模拟分析,测算节能改造方案的节能率,并对比了连续两个采暖期的实测室温。模拟结果发现,增设外墙外保温后,采暖节能量为351 765 282kJ,节能率为19.78%。通过室温实测对比发现,室外温度基本相同时,增设外墙外保温后房间温度普遍升高1~3℃。如果该教学楼进一步进行分时采暖改造,即非寒假采暖期白天7:00~22:00期间16~18℃采暖,夜间22:00~7:00期间5℃采暖;寒假期间全天5℃采暖。则采暖节能量可达614 256 842kJ,节能率可达34.55%。 相似文献
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《建筑科学》2015,(12)
本文采用实地调研和问卷调查的方法,在冬季和过渡季,对广州地区住区室外空间的使用特点进行调查分析。统计结果显示,在冬季10:00~11:00和16:00~17:00是居民室外活动的两个主要时间段,在过渡季,9:00~10:00和17:00~18:00是居民室外活动的两个主要时间段。在室外活动的主要时间段内,居民喜好特定的空间,在冬季居民更喜欢在有直接太阳辐射的场地内活动,而在过渡季居民更喜欢选择太阳照射和阴影交界的场地。室外活动的热感觉状况和对应的热舒适水平具有一定的季节差异性,冬季最舒适的热感觉值为1.2,约为微暖状态,过渡季最舒适的热感觉值为0,为中性状态。 相似文献
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基于暖通设计规范中采暖室外计算温度的统计方法,统计出各典型城市间歇采暖室外计算温度,并分析了相应的热负荷变化。结果表明:对于长期间歇采暖,室外计算温度的取值最大可高于现行规范值3.8℃;对于短期间歇采暖,最大可高于现行规范值4.6℃。以间歇采暖室外计算温度为依据,长期间歇和短期间歇采暖设计热负荷最大可分别降低9%和15%左右。 相似文献
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针对农宅体型系数大、保温性能差、采暖系统效率低下、室内热舒适性差等问题提出了适合干旱寒冷地区的农村绿色建筑技术集成模式,通过改变户型、加强围护结构保温、采用被动式和主动式太阳能采暖技术、地下蓄热技术,降低房间体形系数、提高房间保温性能及房间温度的稳定性,从而提高了所有房间的热舒适性。通过对示范农宅的测试,在室外平均温度为0℃的情况下,客厅温度平均温度在15.9℃;南向主卧平均温度在17.8℃,室内平均温度都在14℃以上,房间热舒适性较好,该农村绿色建筑技术集成模式可在西北干旱寒冷地区进行推广。 相似文献
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建立某办公楼地板辐射采暖房间的二维模型,选择济南地区典型气象年(CSWD,548230)12月份某周末室外气象参数条件,根据现有周末室内采暖启停时间现状,考虑建筑围护结构的蓄能特性,利用FLUENT软件模拟济南市某办公建筑地板辐射周末采暖间歇运行期间室内热环境变化情况,研究满足室内热舒适要求的间歇控制策略。研究结果表明:围护结构对蓄放热过程影响较大,系统在停暖几十小时后,并在需要供暖前开启供暖系统情况下,室内内墙、地面、吊顶表面温度和室内温度未达到未停暖工况的效果,需要提高供水温度。吊顶对室内保温隔热效果比较明显,受辐射地板和内墙壁面附近热空气浮升力的影响,室内逆涡旋流流动明显,热空气上浮,窗户侧冷空气下降沿地板平面掠过。围护结构蓄热过程中,吊顶内空气温度较室内空气温度普遍低2℃~3℃。 相似文献
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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。 相似文献
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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. 相似文献
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Vo Thi Yen-Phi Andrea Rechenburg Joachim Clemens 《The Science of the total environment》2010,408(9):2050-2053
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. 相似文献
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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。 相似文献
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新时期广东城市化的新特点 总被引:4,自引:0,他引:4
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。 相似文献
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《Planning》2022,(5)
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。 相似文献
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北京中原房地产经纪公司市场研究部 《建设科技(建设部)》2005,(4):47-48
趋势一:CBD区域写字楼集中放量从各区域规划方案上看,CBD区域多数项目在03~04年处于项目的报批手续及拆阶段,预计2005年正式推向市场,因此2005年CBD区域将成为北京市场供应集中的域,区域即将供应的项目有北京财富中心(二期)、金地国际花园、万达广场、SOHO尚都、万通中心、世纪财富中心、怡禾国际中心、光华国际等。除去未知项目,2005CBD写字楼办公面积的供应量为60万平方米左右。中关村区域经过一段时间的集中供后开始逐步放缓,2005年供应的体量相对较大的项目有中关村金融中心、新中关。金街区域可能开盘的项目只有2个:英蓝国际中… 相似文献
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浅谈我国工程项目建设成本控制存在的问题 总被引:2,自引:0,他引:2
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。 相似文献
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Jesse E. Raine 《The Annals of Regional Science》1972,6(1):135-144
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. 相似文献