相变储能围护结构在建筑节能中的应用CSCD

相变材料具有高效的能量储存功能。相变材料与建材基体结合,制成一种具有储热功能的围护结构。该围护结构可发挥相变储热功能,降低建筑室内温度波动,增强建筑热舒适度,能够更加有效地减少建筑物运行能耗,从而实现建筑节能。本文对当前现有相变材料的优缺点、相变材料在不同围护结构中的应用、相变储能围护结构对室内热环境的影响及对建筑运行能耗的影响、相变储能围护结构应用的经济性等方面进行了分析,提出相变储能围护结构在工程应用中所存在的不足及其发展前景。     

用于墙体中的固-固相变材料储热性能的研究

使用固一固相变材料作为墙体中的储能材料不会发生渗漏．能增加墙体的蓄热能力，减小室内温度波动，减少建筑能耗。通过实验研究了多元醇类相变材料组成的二元体系在不同组成下的储热性能，从材料的相变温度和相变潜热分析其应用于墙体中的可行性。研究结果表明：在一定的组成下，多元醇二元体系可达到墙体储能要求的相变温度，且相变潜热较大，是理想的墙体相变储能材料。     

脂酸类相变材料墙板在北方寒冷地区应用的DSC分析

考虑到北方地区夏季夜间自然冷风的气候条件和节约用电的峰谷电价差政策 ,经DSC(DifferentialScanningCalorimetry ,示差扫描量热计 )测试 ,选出两种合适的脂酸类相变材料 ,制成相变储能墙板 ,夏季可利用夜间冷风来吸收室内多余冷负荷 ,减少空调系统规模 ;冬季用其与电热膜结合使用 ,利用峰谷电价差达到节约能源的目的。     

相变储能冷藏隔热板的应用

分析了传统冷藏集装箱的结构和传热特点,指出了传统冷藏集装箱隔热保温的局限性,提出了使用相变储能材料的隔热板能够减少冷藏车的能耗和费用。阐述了相变储能的原理,总结了相变储能材料在减少室内温度波动和节能方面的应用,提出并设计了一种使用相变储能材料的节能型冷藏集装箱隔热板,可为同类设计提供参考。     

相变储能建筑材料的应用研究与进展

就建筑相变材料的发展,相变材料与普通建筑材料的结合技术及其储能性能进行了分析;提出目前值得深入研究的重点问题。     

相变储能建筑材料的研究进展

相变储能建筑材料是相变材料与建材基体复合制备的一种新型储能建筑材料。本文分析了相变材料的筛选和改进方法及其封装技术的研究现状,介绍了相变材料与建材基体复合工艺,系统阐述了相变储能建筑材料的作用机理和应用现状,并指出了相变储能建筑材料在实际应用中存在的一些问题,最后展望了相变储能建筑材料的发展前景。     

相变储能材料的研究进展及在建筑中的应用

相变储能技术对于能源的开发和合理利用具有重要意义,综述了相变材料的研究进展状况,介绍了相变材料的分类以及各类相变材料的性能、储能机理和优缺点。讨论了相变储能建筑材料的发展历史,研究方法和当前存在问题。并提出目前值得深入研究的课题。     

建筑围护结构相变蓄热与自然通风技术耦合模拟分析——以合肥地区为例

随着人们对建筑室内热舒适性要求的提高,建筑能耗,尤其是供暖、通风和空调系统的能耗也在不断增加,因此建筑节能潜力巨大的通风蓄热储能系统受到越来越广泛的关注。以位于夏热冬冷地区的合肥为研究地域,对3种非相变围护结构材料和相变围护结构材料的蓄热与自然通风耦合过程进行非稳态模拟研究,通过分析室内风速场分布和温度场分布,获得合肥地区建筑围护结构的自然通风与不同材料蓄热耦合规律,为改善建筑室内热环境、降低建筑能耗以及被动式建筑设计与开发提供理论依据。     

Application of energy storage enclosure with phase change materials in building energy saving

相变材料具有高效的能量储存功能。相变材料与建材基体结合,制成一种具有储热功能的围护结构。该围护结构可发挥相变储热功能,降低建筑室内温度波动,增强建筑热舒适度,能够更加有效地减少建筑物运行能耗,从而实现建筑节能。本文对当前现有相变材料的优缺点、相变材料在不同围护结构中的应用、相变储能围护结构对室内热环境的影响及对建筑运行能耗的影响、相变储能围护结构应用的经济性等方面进行了分析,提出相变储能围护结构在工程应用中所存在的不足及其发展前景。     

相变储能材料在节能建筑设计中的应用

相变储能材料是现代储能专业发展的新型成果,在能源存储开发、建筑、环保等多个领域具有重要作用。本文结合实例针对相变储能材料在建筑领域综合应用情况进行分析探讨,包括相变材料自身的类别和改性情况以及其典型的建筑设计应用。研究证明,现代储能技术与建筑环保等领域的相容,可以有效提升相关行业的发展视域,具有良好的市场认可度和应用前景,值得更深层次的挖掘与研究。     

严寒地区单体建筑太阳能-相变墙系统蓄热特性研究

利用太阳能对水加热并通入相变墙进行蓄热,对减少严寒地区单体建筑供热能耗有重要意义。以大庆市某单体建筑为例,结合该地区太阳能分布特点及建筑热负荷大小,对适用于该地区的太阳能-相变墙系统进行集热与储热能力计算,并采用CFD方法研究单一工况下该系统的热工变化规律及不同热水参数、换热管规格对相变墙蓄热特性的影响。结果表明：该相变墙热稳定性良好,但受自然对流影响,底部相变材料熔化较慢;管径DN25、入口流速0.3m/s、供水温度310.15K、回水温度309.15K、管间距107mm可使相变材料在4小时内完成蓄热,平均节能率为31.8%。研究结果可望为降低严寒地区建筑供热能耗提供新思路。     

Optimization of a phase change material wallboard for building use

In construction, the use of phase change materials (PCM) allows the storage/release of energy from the solar radiation and/or internal loads. The application of such materials for lightweight construction (e.g., a wood house) makes it possible to improve thermal comfort and reduce energy consumption. A wallboard composed of a new PCM material is investigated in this paper to enhance the thermal behavior of a lightweight internal partition wall. The paper focuses on the optimization of phase change material thickness. The in-house software CODYMUR is used to optimize the PCM wallboard by the means of numerical simulations. The results show that an optimal PCM thickness exists. The optimal PCM thickness value is then calculated for use in construction.     

相变墙房间传热特性研究

通过建立基于焓法相变墙板的传热模型,研究了其传热特性,分析了影响相变墙板传热性能的因素,选取出了适合于重庆地区的相变墙板,研究了重庆的相变墙房间和普通房间的传热特性,对比分析了夏季和冬季相变墙房间和普通房间的温度情况并经实测验证。结合削峰填谷政策做了经济性分析。结果表明相变墙房间不仅节省能源,能提供舒适的环境。而且投资回收期仅十四个月。     

Parametric analysis of space cooling systems based on night ceiling cooling with PCM‐embedded piping

A parametric analysis is conducted for space cooling systems based on cold water flowing, during the night, within regularly arranged pipes embedded in a layer of phase change material (PCM), located among the structural layers of the ceiling. The introduced PCM layer in conjunction with night cooling add to the usual ceiling cooling systems offers the advantages of low energy consumption, high cool storage capacity, operation under reduced night electricity price, smoothing of electricity consumption by eliminating daily peak loads, improved thermal comfort and elimination of ceiling dripping. Our parametric analysis is based on a transient three‐dimensional finite‐difference solution of the related heat‐transfer problem for various values of all the main system parameters. PCM phase change process is simulated by using the effective thermal capacity function, which is determined experimentally for PCM suitable for air‐conditioning applications. Our tests showed that the main parameters of the system are pipe spacing, PCM layer thickness, pipe depth within the ceiling, cooling water inlet temperature, night cooling duration and PCM properties (thermal conductivity, phase change heat and ends of phase change temperature range). The effect of all the above parameters is analysed and suggestions are made for selecting the proper combinations of their values in order to obtain the lowest energy consumption in conjunction with the highest level of thermal comfort. Copyright © 2010 John Wiley & Sons, Ltd.     

Thermal dynamics of wallboard with latent heat storage

Wallboard impregnated with phase change material (PCM) will provide thermal storage that is distributed throughout a building, enabling passive solar design and off-peak cooling with frame construction. This paper examines the thermal dynamics of PCM wallboard that is subjected to the diurnal variation of room temperature, but is not directly illuminated by the sun. The purpose of this work is to provide guidelines useful in selecting an optimal PCM and in estimating the benefits of PCM architectural products. The energy stored during a daily cycle depends upon a) the melt temperature of the PCM; b) the temperature range over which melt occurs; and c) the latent capacity per unit area of wallboard. Situations with the wallboard on an interior partition or on the inside of the building envelope are investigated separately. The following findings are presented. The maximum diurnal energy storage occurs at a value of the PCM melt temperature that is close to the average room temperature in most circumstances. Diurnal energy storage decreases if the phase change transition occurs over a range of temperatures. The diurnal storage achieved in practice may be limited to the range 300–400 kJ/m², even if the wallboard has a greater latent capacity. The implications of these findings for test room experiments are discussed.     

Thermal performance of shape-stabilized phase change paraffin wallboard

This paper presents thermal performance of shape-stabilized phase change material (PCM) wallboards and common wallboard. Shape-stabilized PCMs consist of paraffin and high-density polyethylene as support materials. The wallboards were prepared by shape-stabilized PCMs and grout with the building materials in mass proportions of 5%, 10%, and 15%. The phase change temperature of the shape-stabilized paraffin was 27.5 °C and the maximum content of paraffin in the shape-stabilized PCM was 70%. The energy-saving effect and feasibility of shape-stabilized PCM wallboard were compared with those of ordinary wallboards. The results showed that prepared PCM wallboard has good thermal performance and thus it has high potential for the cooling of buildings.