相变储能保温建筑材料的制备及性能评价

以石蜡为相变储能物质,以水泥、粉煤灰、增塑剂、减水剂、聚丙烯纤维、膨胀聚苯颗粒和膨胀珍珠岩为原料制备了纤维增强相变储能保温建筑材料。并通过自行设计的检测设备检测该相变储能材料的调温性能、稳定性和节能效果。检测结果表明,含石蜡相变储能材料相对于普通材料具有优越的调温效果、节能效果,稳定性良好。     

开放教育ESP教学语境化探析

ESP作为英语语言教学的一个新兴分支,是成人高校英语教学改革的一个必然趋势。开放教育ESP的显著特点是学习者既有明确的学习目的,学习内容又具有专业性。开放教育学习者具有多样性、个性化、职业化的特点,因此ESP教学具有其独特性。以开放教育学习者为研究对象,立足于开放教育学习者英语学习现状,在分析ESP教学语境特征的基础上,提出开放教育ESP教学是一个基于多重语境建构完成语言学习任务的动态过程。开放教育ESP教学不仅是对语言知识的传授,更是一个充满活力的语境建构过程。情景语境、文化语境和认知语境不断被激活并处于动态建构中,构成一个互为关联的动态语境系统,为开放教育ESP教学提供一个清晰的、有层次的、可以选择的语境结构图。     

复合相变蓄热材料太阳能通风井性能

针对太阳能通风井道蓄热单元的技术需求,制备了复合相变蓄热材料,并将其应用于通风井壁,建立了基于复合相变蓄热材料的太阳能通风井测试系统,并测试了其运行性能。结果表明:添加5%碳纳米管制备的复合相变材料,其导热系数为0.65 W/m·K,是添加前的2.03倍,相变潜热为107J/g,是添加前的0.718倍。应用上述材料的太阳能通风井测试系统在10:00—21:00时段通风量为55.0~103.9m~3/h,其中在17:00风速和风量达到最大,为良好的自然通风提供了保障。     

Stearic acid/silica fume composite as form-stable phase change material for thermal energy storage

The aim of this research is to prepare a novel form-stable composite phase change material (PCM) for the latent heat thermal energy storage (LHTES) in buildings, passive solar space heating by impregnating of stearic acid (SA) into silica fume (SF) matrix through the technique of solution impregnation. The structure, thermal properties, thermal reliability, thermal conductivity and heat storage or release performance of the composite PCM were determined by scanning electron microscope (SEM), Fourier transformation infrared (FTIR), differential scanning calorimetry (DSC) and thermal cycling test analysis technique. The results show that the form-stable composite PCM has the optimal effect, preventing the leakage of SA from the composite, emerges when the SA and SF mass ratio is 1:0.9. The SA loaded on the matrix surface by physical attraction with the mass ratio of 47% during the preparation process. The latent heat of the composite PCM is measured as 82.53 J/g for the melting process and 84.47 J/g for the freezing process, respectively, which indicate the heat storage ability of composite is connected with the mass ratio of SA in composite. The results of DSC, FTIR and thermal cycling test are all show that the thermal reliability of the composite PCM has an imperceptible change. The increase of thermal conductivity was also confirmed by comparing the melting time, freezing time and phase change time of the composite with that of SA. All of the conclusions indicate that the composite has a better thermal conductivity and good thermal and chemical stability.     

建筑节能用相变储能混凝土的研制

本文通过试验研究,筛选了月桂酸与月桂醇二元低共熔体作为相变材料,选择膨胀珍珠岩作为载体,利用真空吸附法制备了相变骨料,采用普通混凝土制备工艺配制出了建筑节能用相变储能混凝土并对其物理力学性能及储能效果进行了测试。     

相变储能建筑材料的最新研究进展

分析了相变材料、定型相变材料研究在建筑节能、建筑结构的整体稳定和保护环境等方面的重要意义;例举了相变材料的种类及相应的优、缺点;国内、外对定型相变材料的定型方法研究;定型相变材料的储、导热性研究;建筑墙材中定型相变材料的再包覆工艺、临界掺量、稳定性研究;定型相变材料在新型地板辐射采暖系统中的研究;定型相变材料今后的研究重点。     

相变储能材料在节能建筑中的应用

根据相变储能材料的自身特点,介绍了相变储能材料在节能建筑中的应用,分别对相变储能材料在建筑围护结构、供暖系统、空调系统中的应用情况进行了概括和评述,并在此基础上探讨了相变储能材料的研究方向和未来的发展趋势。     

建筑石膏基相变储能材料的制备与分析

以石膏为载体,癸酸和月桂酸二元混合酸为相变材料,通过实验确定石膏基相变储能材料的制备工艺,并详细分析其容留量、渗出程度及热物性能,得出了一些有价值的结论,以供参考借鉴。     

相变蓄能建筑材料的发展

首先总结了近几年建筑节能中相变蓄能技术的研究进展,然后对相变蓄能建筑材料的制备技术和研究方法等进行了概述,并对相变蓄能建筑材料在多功能墙体或地板、智能控温建筑物或混凝土工程及太阳能建筑等方面的应用前景进行了展望,以促进相变蓄能建筑材料的发展。     

相变储能建筑材料的制备和应用研究

建筑能耗在社会能耗中占有很大比例,把相变材料和传统的建筑材料复合制成的相变建筑节能复合材料是一种较为有效的节能材料,能在建筑节能中发挥良好的作用,把这种材料应用到建筑中,可以改变房屋建筑的室内居住环境,达到减少建筑能耗的目的。     

Co-simulation of a HVAC system-integrated phase change material thermal storage unit

A co-simulation environment, consisting of a detailed mathematical model of a thermal energy storage unit which is incorporated with an EnergyPlus simulation model of a full building HVAC system, is described. The two models are integrated using the user-defined plant component feature in EnergyPlus and the Building Controls Virtual Test Bed (BCVTB) environment. The thermal energy storage unit, which consists of encapsulated phase change material in a series of flat plates and a heat transfer working fluid (water), is modelled using a transient one-dimensional forward finite difference method. The thermal storage model is executed within MATLAB and is verified against experimental data, showing a discharging heat transfer accuracy to within 2.5%. The building model, which incorporates a retrofitted ground source heat pump system within a thermally massive building, is simulated in the EnergyPlus environment. The co-simulation arrangement allows for in-depth analysis of the integrated system under dynamic operating conditions, which is currently not possible within the EnergyPlus environment. Moreover, the overall adopted approach, based on generic integration of a detailed mathematical model, using a third party generalised programming environment, into an established building simulation environment, serves as a successful exemplar for other researchers and practitioners working in the field.     

复合相变储能材料的性能研究比较

选用优质多孔载体材料膨胀珍珠岩与相变储能材料月桂酸、石蜡,通过简单的物理熔化法进行熔融复合,制备出复合相变储能材料,并且对制备好的两种复合相变储能材料做一系列实验,对其性能进行研究比较。     

Experimental study and assessment of thermal energy storage mortar with paraffin/recycled brick powder composite phase change materials

Thermal energy storage recycled powder mortar (TESRM) was developed in this study by incorporating paraffin/recycled brick powder (paraffin/BP) composite phase change materials (PCM). Fourier transform infrared and thermogravimetric analysis results showed that paraffin/BP composite PCM had good chemical and thermal stability. The onset melting temperature and latent heat of the composite PCM were 46.49 °C and 30.1 J·g⁻¹. The fresh mortar properties and hardened properties were also investigated in this study. Paraffin/BP composite PCM with replacement ratio of 0%, 10%, 20%, and 30% by weight of cement were studied. The results showed that the static and dynamic yield stresses of TESRM were 699.4% and 172.9% higher than those of normal mortar, respectively. The addition of paraffin/BP composite PCM had a positive impact on the mechanical properties of mortar at later ages, and could also reduce the dry shrinkage of mortar. The dry shrinkage of TESRM had a maximum reduction about 26.15% at 120 d. The thermal properties of TESRM were better than those of normal mortar. The thermal conductivity of TESRM was 36.3% less than that of normal mortar and the heating test results showed that TESRM had good thermal energy storage performance.     

相变材料的基本理论及其在建筑节能领域的应用

参考国内外文献,对相变材料的分类、相变形式、不同相变材料的优缺点以及选择相变材料的相关依据进行论述.鉴于我国建筑能耗逐年上升的趋势,研究相变材料在建筑节能领域的应用具有重要意义.     

建筑相变材料的封装技术

概述了建筑相变材料的发展历程及研究现状。在对储能机理分析的基础上,归纳了建筑相变材料的性能要求。介绍了目前研制建筑相变材料用到的各类主要封装技术以及这些封装技术的优缺点。在此基础上指出建筑相变材料存在的问题,预测了发展趋势,最后进行了总结。     

Phase change materials for building applications: A state-of-the-art review

Phase change materials (PCMs) are regarded as a possible solution for reducing the energy consumption of buildings. By storing and releasing heat within a certain temperature range, it raises the building inertia and stabilizes indoor climate. Within this work, a state-of-the-art review is given on the knowledge of PCMs today for building applications.     

相变和化学反应储能在建筑供暖空调领域的应用研究

以１９９７年召开的第７届国际储能会议文献为基础,综述了近年来国际上有关应用研究成果和动态,指出出近期领域中的一些值得研究的问题。     

石膏载体定形相变材料的制备及其热性能

制备了以石膏作载体、石蜡作相变材料的定形相变材料(复合石膏板)。实验证明表面活性剂硬脂酸钠可有效提高石膏板吸收石蜡的质量比,差示扫描量热结果显示复合定形相变材料中石蜡的相变温度、峰顶温度降低,相变吸热量与相变蜡在复合材料中的质量成正比。     

Effect of double layer phase change material in building roof for year round thermal management

Efficient and economical technology that can be used to store large amounts of heat or cold in a definite volume is the subject of research for a long time. Latent heat storage in a phase change material (PCM) is very attractive because of its high-energy storage density and its isothermal behavior during the phase change process. Thermal storage plays a major role in building energy conservation, which is greatly assisted by the incorporation of latent heat storage in building products. Increasing the thermal storage capacity of a building can enhance human comfort by decreasing the frequency of internal air temperature swings so that the indoor air temperature is closer to the desired temperature for a longer period of time. However, it is impossible to select a phase change material to suit all the weather condition in a given location. The PCM that reduces the internal air temperature swing during the winter season is not suitable for the summer season as the PCM remains in the liquid state at all the times during these months and hence the system cannot exploit the latent heat effect. This paper attempts to study the thermal performance of an inorganic eutectic PCM based thermal storage system for thermal management in a residential building. The system has been analyzed by theoretical and experimental investigation. A double layer PCM concept is studied in detail to achieve year round thermal management in a passive manner.     

"可再生能源与建筑集成技术研究与示范"项目——课题一/子课题:相变蓄热地板性能实验

长期以来，北方地区采暖以燃煤为主．对城市环境造成了较大的污染。而太阳能作为一种清洁的可再生能源．分布范围广，取之不尽，用之不竭。