投料工艺对沥青混合料搅拌均匀性的影响研究

为了提高沥青混合料的搅拌效率和搅拌均匀性,采用EDEM离散元软件仿真分析和试验研究相结合的方法对投料工艺参数进行了研究,所得结果表明:投料位置影响原材料在搅拌器内的初始分布均匀性,横向中央布置的投料位置搅拌效果要优于横向单侧和轴向端部两种;投料持续时间影响着材料进入拌锅的速率,随着投料持续时间的延长,混合料的搅拌均匀性有所改善。     

沥青混合料保温仓仿真分析研究

沥青路面早期病害中,有许多是由于沥青混合料的温度离析造成的,这样保证沥青混合料的温度一致性成为避免一些病害的基础,温度不均匀同样降低路面的再生质量,因此,一般需要配置新沥青混合料保温仓对新沥青混合料进行加热与保温,保证其适宜的温度。本文利用ANSYS软件对保温仓进行温度场仿真,以验证其保温效果。     

沥青搅拌器粉料投料位置的分析与改进

本文结合沥青搅拌器的搅拌理论,首先对粉料投料位置与搅拌均匀性的关系进行理论分析;然后分析目前厂家广泛使用的搅拌器的几种粉料投料位置所存在的缺陷与不足,并针对存在的缺陷进行理论分析,在分析的基础上提出相应的改进措施,最后利用EDEM离散元软件对目前采用的粉料投料位置和改进后的粉料投料位置进行模拟和验证,模拟仿真结果表明改进后的粉料投料位置可以有效提高混合料的搅拌均匀性和降低搅拌时间。     

沥青路面坑槽微波热料快速修补技术研究

通过分析沥青路而坑槽的成刚及常见的修补对策,提出用微波作为热料填补坑槽的热源．许通过试验研究了微波加热沥青混合料的速率、均匀性及加热前后对沥青混合料性能的影响,得到微波适合加热填补材料的结论,最后阐述了微波热料修补的工艺流程。     

摊铺机熨平板电加热控制系统的改造

本文介绍了从设计方案和工作原理两个方面介绍了一种改进的摊铺机熨平板电加热控制系统,该系统可使摊铺机熨平板的加热更加均匀,在作业时尽可能保持沥青混合料恒定的温度,有效地降低了沥青混合料的温度离析,提高了路面摊铺的质量。结构简单,安全可靠,检测效果好。     

多孔沥青混合料旋转压实效果研究

基于数字图像处理技术,分析多孔沥青混合料试件的断面数字化信息,研究混合料的旋转压实特性。以粗集料水平的分布特征、改进的颗粒面积比和空隙率的分布等特性描述混合料的均匀性,为研究多孔沥青混合料的均匀性提供参考。结果表明,在足够的旋转压实功下,粗集料截面几何中心对称且沿直径方向分布均匀。空隙率沿试件高度方向呈两端大、中部低分布。     

微晶合成石的配制工艺及改进方法

对微晶混合料现行的两种搅拌方式进行了分析，并对混料的均匀性和预抽真空而保证压制的密实性提出了改进方案，还介绍了预制纹理工艺的扩展运用。     

沥青混合料路面均匀性影响因素研究

对沥青混合料路面均匀性的各影响因素进行了研究,结果表明,选择合适的沥青混合料类型和原材料、加强对原材料的管理、正确进行沥青混合料的设计、采用合适的拌和、运输方式和摊铺、碾压工艺,有利于提高沥青路面的均匀性。     

高速公路沥青混凝土路面施工工艺与路面设备性能(2)

沥青混凝土路面机群施工中,搅拌机把一定配合比的原材料加热并搅拌成沥青混合料;运输汽车将搅拌好的沥青混合料运至摊铺机前并卸料;摊铺机在满足摊铺温度的前提下对该沥青混合料进行摊铺.     

热拌沥青混合料拌和和易性的评价方法

基于沥青混合料的材料组成及分布,采用扫描电镜（SEM）测定热拌沥青混合料中集料表面裹附的沥青膜厚度,并提出一种拌和和易性评价指标.采用集料分布均匀性和压实度测试结果进一步验证和分析不同热拌沥青混合料拌和和易性的变化规律.结果表明：沥青种类、级配类型及拌和温度对热拌沥青混合料拌和和易性影响作用不同;沥青膜在集料表面裹附得越均匀,热拌沥青混合料的拌和和易性就越好,集料分布的离散性越小,热拌沥青混合料成型的压实度越大.     

The impact of energy efficient refurbishment on the space heating fuel consumption in English dwellings

The aim of this study is to examine the effect of a major domestic energy efficiency refurbishment programme on domestic space heating fuel consumption. The case study dwellings were monitored either before or after (or both) the introduction of energy efficiency retrofit measures such as cavity wall insulation, loft insulation, draught stripping and energy efficient heating system. Property and utility consumption data were collected and half-hourly living room and main bedroom temperatures were monitored for 2–4 week period over two winters from a total of 1372 households selected from five major urban areas in England. Space heating fuel consumption was normalized to account for variation in the indoor–outdoor temperature difference and the dwelling floor area. The findings show that cavity wall and loft insulation can reduce the space heating fuel consumption by 10% in centrally heated properties and 17% in non-centrally heated properties. However, the introduction of a gas central heating system, although theoretically more efficient, has no significant impact in reducing fuel consumption even after adjusting for increased internal temperature.     

地暖轻质发泡水泥保温层施工

针对地暖工程,并结合具体工程实践,阐述了地暖轻质发泡水泥保温层施工工艺,总结了地暖轻质发泡水泥保温层施工的优点,指出该工艺大大缩短了施工工期,具有良好的经济效益,值得推广使用。     

The environmental impact of optimum insulation thickness for external walls of buildings

The city of Denizli is in the 3rd climatic region in Turkey and there is a heating requirement for a period of approximately five months. During this period, thermal insulation of buildings is very important in minimizing the energy usage and reducing emission. In this study, environmental impact of optimum insulation thickness in external walls has been investigated for the case of Denizli, Turkey. In the calculations, coal was used as the fuel source and the expanded polystyrene as the insulation material. The results proved that when the optimum insulation thickness was used, energy consumption was decreased by 46.6% and the emissions of CO₂ and SO₂ were reduced by 41.53%.     

Cooling and heating loads in residential buildings in Jordan

Cooling and heating load calculations for air-conditioned and heated buildings have been calculated for three different cities in Jordan, representing three climatic regions; namely, Irbid, Amman and Aqaba. To analyze the insulation effect of buildings, for each region four combinations of wall and ceiling insulation were considered: no insulation; only wall insulated; only ceiling insulated; and both ceiling and wall insulated. The results showed that the average monthly heating load was reduced when only walls were insulated; however, this has a negative impact on the average monthly cooling load. In the case where only the ceiling was insulated, both the monthly cooling and heating loads were reduced. A comparison showed that with both wall and ceiling insulated, the energy requirements could be reduced by more than 40%. In Aqaba, with both walls and ceiling insulated, there would be no need for any heating during the whole year and in both Amman and Irbid there were at least four months in which there would be no need for either heating or cooling.     

外墙保温技术的应用

为节约能源我国在热工设计方面做出了强制性规定，外墙保温技术的应用正在普及。结合工程实际介绍了外墙保温技术的应用及实际效果。     

Insulation plan of aluminum curtain wall-fastening unit for high-rise residential complex

Aluminum curtain wall system is commonly used in high-rise residential complex. For the energy-efficient curtain wall system, the insulation performance of the fastening unit, which enjoins the curtain wall unit to the slab, should be improved because in Korea, hot water pipes for radiant heating are typically installed on the slab in residential buildings. However, this fastening unit composed of metals with high thermal conductivity, acts as a thermal bridge that increases heat loss. Therefore, in this study, we aim to develop a more effective insulation method for the fastening unit. Three alternative fasteners coated with urethane foam and insulation paint were selected (Case 1: using the existing fastener; Case 2: coating the upper part of fastener with urethane foam; Case 3: coating the entire surface of fastener with insulation paint; Case 4: coating the upper part of fastener with urethane foam and the lower part with insulation paint). The heat loss and economical efficiency of each case were analyzed through the three-dimensional annual transient heat transfer simulation and payback period method, respectively. Case 4, compared to Case 1, was found to show the best performance of reducing the annual heat loss by 8.14%. From an economical efficiency perspective, however, Case 2 was found to have the shortest payback period of 2.27years.     

公建节能标准在办公楼采暖改造中的实施

按照DBJ 04-241-2006公共建筑节能设计标准的要求,结合某工程实际情况,论述了办公楼采暖系统改造的特点,并对建筑围护结构保温隔热设计、采暖系统设计、采暖管道保温设计等作了研究,经实践指出,将公共建筑节能设计标准应用于系统中,达到了舒适且节能的效果。     

Thermal behavior and energy saving analysis of a flat with different energy efficiency measures in six climates

This article aims at studying the impact of many construction parameters of a flat on its energy performance and thermal comfort. The studied parameters are: the envelope thermal insulation, the orientation, the floor level, the ground coupling, the roof and the external walls absorption coefficient and the controlled mechanical ventilation. The TRNSYS based numerical study is performed in six different climates ranging from cold to desert one. The numerical model has been validated against experimental results obtained from summer and winter long term monitoring campaigns of the flat located in the Marrakech city, Morocco. The apartment’s heating and cooling loads as well as thermal discomfort indexes are calculated for the possible eleven configurations combining the studied parameters. The results show that high thermal insulation of the walls leads to an apparent summer overheating with an increase in the flat’s total thermal load by up to 18% in all the considered climates, except for the cold one. It was found that the walls’ light thermal insulation resulting from the cavity wall technique is sufficient to reach an acceptable level of thermal comfort thus preventing summer overheating. Similarly, thermal insulation of the slab-on-grade floor was found to perform an increase in thermal load for hot and moderate climates by at least 67%. The best combination of all the studied energy efficiency measures for each climate conditions was evaluated via comparison to a reference case that represents the actual apartment.     

建筑节能技术在山东德州“新湖春天”工程中的应用

结合德州新湖春天节能建筑的工程实例,分析节能材料在围护结构各部位的应用,介绍了外墙外保温技术.LOW-E镀膜反辐射中空玻璃、屋顶地面保温技术、地热-太阳能热水技术、太阳能光伏电技术、地板辐射采暖技术、地热梯级利用等节能技术的综合利用,并简略叙述了该项目所具有的推广价值,通过工程实践证明,建筑节能技术的应用将产生良好的经济效益和社会效益.     

外墙保温欧文斯科宁在工程中的应用

随着国家节能政策的深入贯彻以及人们对室内热环境、舒适度要求的不断提高，外墙外保温系统已被广泛地认为是最有效的建筑节能措施之一，同时也是改善大气环境，发挥投资效益强有力的手段。采取必要的建筑节能措施，可大大降低建筑采暖和空调能耗，使现代人能在比较经济且降低能耗的前提下获得舒适的生活环境。