色浆对热反射隔热涂料热反射性能的影响

通过向白色热反射隔热涂料中添加不同颜色的色浆,然后测试250～2500nm范围内光谱反射性能.比较研究了添加不同浓度的铁红、铁黄、酞青蓝、酞青绿色浆后,热反射隔热涂料近红外区段热反射性能的变化规律.     

微珠掺量对热反射隔热涂料隔热性能的影响

通过模拟试验,研究分析了不同空心玻璃微珠掺量对热反射隔热涂料隔热性能的影响,试验结果表明,未掺微珠的涂料与微珠掺量为15%的涂料相比,隔热效果相差4℃左右。     

热反射隔热涂料的研究

热放射隔热涂料具有极强的发射隔热效果,越来越受到人们的关注。本文概述了热反射功能涂料的国内外进展,并提出了今后的发展方向。     

建筑用热反射隔热涂料的研究进展

建筑用热反射隔热涂料技术是一种有效的节能技术,近年来国内外研究取得了很大进展。由于颜填料是热反射隔热涂料的关键,因此重点介绍了对热反射隔热涂料中常用颜填料、复合型填料以及透明涂料的纳米填料的研究现状,最后对热反射隔热涂料的未来研究和应用进行了展望。     

热反射涂料隔热计算的研究

分析热反射涂料组成和隔热机理,通过采用热反射涂料等效热阻的方式对隔热效果进行量化,同时结合具体工程实例,分别采用3种计算方法对热反射涂料的隔热效果进行计算,验证了3种计算方法都是切实可行的。     

热反射隔热涂料对混凝土温度场的影响规律研究

日光辐射下结构内部产生的温度荷载是混凝土桥梁及轨道等结构的主要荷载,通过特殊措施改变结构温度场可降低结构荷载,从而降低结构的造价或减小结构的不利温度应力(及变形)。探讨了混凝土表面涂刷反射隔热涂料对混凝土温度场的影响规律,通过模拟日光照射,测试了反射隔热涂料对不同强度等级的混凝土试件表面温度、芯部温度、温升(降)速率及温度梯度的影响规律。结果表明,白色反射隔热涂料可有效地降低混凝土的表面温度、芯部温度、温升(降)速率,并可显著降低混凝土的温度梯度。研究结果为主动降低特殊混凝土结构温度荷载提供了一种新思路。     

热反射涂料及其隔热性能研究

本文通过热反射涂料与普通涂料的对比试验,对涂屏lJ在不同建筑材料表面导致正、反面温度变化情况进行了试验研究。试验结果表明：掺有空心陶瓷微珠的热反射涂料具有较高的反射率和辐射率,从而可以降低热传导能力,具有较好的保温、隔热作用。     

广西建筑热反射隔热涂料节能研究

调查研究显示,将建筑反射隔热涂料涂到建筑外墙后,能够起到明显的节能效果。尤其是在一些夏热冬暖的地区,如广西等地。本文通过对建筑热反射隔热涂料节的节能性进行的研究,以期对广西建筑热反射隔热涂料节能事业的发展尽到绵薄之力。     

热反射涂料隔热机理及其耐久性研究

建筑热反射涂料由反射率及辐射率较高的颜料微粒子、填料和适当的成膜物质制成,节能效果显著,但在使用过程中它会受到外界环境因素的影响,使涂层太阳光反射比出现不同程度的下降。文章指出,热反射涂料节能效果持久性的问题应得到关注并加以研究。     

颜填料对水性反射隔热涂料太阳光反射比的影响

采用JG/T 235—2014《建筑反射隔热涂料》测试方法表征了水性反射隔热涂料的太阳光反射比和近红外反射比,着重研究了钛白粉、常用填料、空心玻璃微珠和普通色浆对涂料太阳光反射比的影响。     

Effect of roof solar reflectance on the building heat gain in a hot climate

The effect of the roof solar reflectance on the thermal performance of a building is often ignored. However, there are significant differences in heat gain from light and dark-coloured roof surfaces. In this paper an equation for the average daily downward heat flow of a sunlit roof is derived. Using building simulation, it is first shown that the thermal mass of the roof does not significantly affect the overall daily heat gain (although it causes a time lag and reduction in peak heat flow). As a consequence the daily heat gain from the roof may be estimated by integrating the equation for the steady-state downward heat transfer over the day. For north Australia the derived equation suggests that a light-coloured roof has about 30% lower total (air temperature difference and solar-driven) heat gain than a dark-coloured one. The effect of aging (change in solar reflectance with time) is considered in the calculations and a relationship between the solar absorptance of new and aged material is suggested. A classification of roof colours with respect to their solar absorptance (dark, medium, light and reflective) is proposed to enable a quick and simple assessment of the effect of roof colour on the heat gain and R-value.     

丙烯酸屋顶反射节能涂料技术

介绍了丙烯酸屋顶涂料技术的概念和基本原理,国外的经验和相关研究报告表明,该技术是一种成熟有效的屋顶节能和保护技术.它提供了一种经济简便的屋顶节能防水一体化技术,同时可应用于旧屋顶翻新.结合实际案例,介绍了白色丙烯酸屋顶涂料在不同屋顶基材类型上的不同产品体系和性能特点,并介绍了国内外相关标准和性能指标.     

浅析丙烯酸屋面反射节能涂料技术

介绍了一种具有保护和节能效果的白色丙烯酸屋面涂料技术。该涂料可对底下的各种耐候性不佳的防水材料进行有效保护,从而延长屋面使用寿命;可有效反射太阳光,降低室内空调能耗;还可降低施工、维护综合成本。     

A laboratory experiment on natural ventilation through a roof cavity for reduction of solar heat gain

The study targets the reduction of roof solar heat gain through the use of natural ventilation in a roof cavity. This study is mainly concerned with factory buildings. Experimental outcomes were obtained from an inclined cavity model which was heated on the upper surface to mimic solar radiation on a roof. The dimensions of the cavity were 4882 mm× 400 mm × 78 mm. The two opposing smallest sides were allotted as the inlet and outlet, and narrowed to simulate resistance of the air flow in practical applications. Temperature and velocity measuring facilities were prepared in the experimental model. A number of measurements were carried out by varying the combinations of different heat production, inclination angles, and opening ratios. It was found that resistance to heat and air flow in the cavity was strongly influenced by the opening size. When the Reynolds number was examined, it showed that the flow belonged to the laminar region. The average velocity reached to 0.25 m/s at the highest in the examined cases. In other words, the cavity air was turned over 184 times in an hour. Natural ventilation in the roof cavity seemed to be effectively applicable to solar incidence discharges in factory buildings.     

Effect of solar gain through walls and windows on annual building heat needs

A window with an open south facing aspect can admit large solar gains in cold but sunny conditions and will then reduce the need for back up heating. In cold overcast conditions the same window will cause a bigger demand for heat to be placed upon the heating plant. The net energy need depends upon the local climate, the comfort temperature chosen, ventilation losses and the design of the window or glazed wall. A study is reported in which 50 years of jointly occurring daily values of temperature and irradiance at 53.4°N on a U.K. site are used. A rank order is suggested for the effectiveness of various constructions as energy saving components.     

太阳热反射弹性涂料的研究

以丙烯酸乳液为基料，以金红石型钛白粉、重质碳酸钙及空心硼硅酸盐玻璃微珠为颜填料制备了2类隔热性能良好的太阳热反射弹性涂料：一类为屋面用涂料，其性能符合JC／T864—2000《聚合物乳液建筑防水涂料》的要求；另一类为外墙涂料，其性能符合GB／T9755—2001《合成树脂乳液外墙涂料》的要求，且拉伸强度不小于1．0MPa，断裂延伸率不小于150％，0．3MPa、0．5h不透水。     

An integrated empirical and modeling methodology for analyzing solar reflective roof technologies on commercial buildings

Buildings impact the environment in many ways as a result of both their energy use and material consumption. In urban areas, the emission of greenhouse gases and the creation of microclimates are among their most prominent impacts so the adoption of building design strategies and materials that address both these issues will lead to significant reductions in a building's overall environmental impact. This report documents the energy savings and surface temperature reduction achieved by replacing an existing commercial building's flat roof with a more reflective ‘cool roof’ surface material. The research methodology gathered data on-site (surface temperatures and reflectivity) and used this in conjunction with the as-built drawings to construct a building energy simulation model. A 20-year cost benefit analysis (CBA) was conducted to determine the return on investment (ROI) for the new cool roof construction based on the energy simulation results. The results of the EnergyPlus™ simulation modeling revealed that reductions of 1.3–1.9% and 2.6–3.8% of the total monthly electricity consumption can be achieved from the 50% cool roof replacement already implemented and a future 100% roof replacement, respectively.This corresponds to a saving of approximately $22,000 per year in energy costs at current prices and a consequent 9-year payback period for the added cost of installing the 100% cool roof. The environmental benefits associated with these electricity savings, particularly the reductions in environmental damage and peak-time electricity demand, represent the indirect benefits of the cool roof system.     

Effect of courtyard proportions on solar heat gain and energy requirement in the temperate climate of Rome

The present study focuses mainly on the effect of solar heat gain on the energy demand of courtyard building form with different proportions. Several methods can be employed to improve the building's utilization of solar heat gain. This includes using light colours for the external surfaces to reduce the solar radiation absorption in summer, using shading devices and improving the thermal properties of the external walls and roof. However, it is of great importance before using any of these methods to have the courtyard building's architectural design adapted to have full advantage of the available solar heat gain. Therefore, the main objective of the present examination was to find out to what extent the building's solar heat gain and consequently the energy requirements are influenced by the building's configurations. A computer Tool (IES) was used to carry out the investigation taking Rome as an empirical background to temperate climate. The results showed that the proportions of the courtyard building considerably influence the need for heating and cooling.