高温相变蓄热电暖器蓄放热性能试验研究

对研制的高温相变蓄热电暖器的蓄放热性能进行了试验研究,结果表明该电暖器蓄热密度大,蓄放热性能稳定,蓄热时隔热性能好,放热时放热速率可满足普通供暖要求。     

一种高温相变蓄热电暖器的研制及其热性能测试

本文介绍了一种新型的高温相变蓄热电暖器的研制。对该蓄热电暖器热性能进行了测试,结果表明该电暖器蓄热效率高,相变材料在相变阶段温度恒定且散热功率基本不变,热舒适性好;此种电暖器热性能与显热式蓄热电暖器比较具有明显的优势。因此,高温相变蓄热电暖器是一种理想的电采暖设备,可以实现对电网负荷削峰填谷、降低电采暖费用的目的。     

高温相变蓄热装置传热性能分析

储能技术在提高能源综合利用效率方面有着不可代替的作用,它不仅可以充分满足装置和系统在供电方面的实际需求,而且可以有效解决供电在时间和空间上的矛盾,从而极大的提高能源综合利用率。一般来说,相变蓄热装置的性能主要取决于工作过程中的热传递环节,并有效的改善和调节相变蓄热装置的性能。笔者在本文将简单阐述高温相变蓄热的主要类别,并根据蓄热器的工作原理进行一定的数值模拟实验,进而分析高温相变蓄热装置的传热性能。     

毛细管相变蓄热罐性能实验研究

相变蓄热装置是太阳能、工业余热等供热技术推广应用的关键装备。在分析现有相变蓄热装置特性的基础上,提出了毛细管相变蓄热罐,并结合一种复合型相变蓄热材料,对其热物性进行了测试,结果表明该复合相变蓄热材料符合太阳能供热技术的要求。同时研究了水流量和供水温度对毛细管相变蓄热管性能的影响,得出了最佳流量,为毛细管相变蓄热罐的设计提供了数据支持。     

高温相变蓄热技术

节能环保是当今社会的热点话题，寻找新的环境友好型能源及行之有效的节能技术已经成为一个迫切的课题。相变蓄热技术作为一种高效环保的节能技术，一直受到关注。但对于它的研究大多集中于中低温蓄热技术。本文将重点介绍高温相变蓄热材料的工作原理，以及高温相变蓄热技术作为一种新的节能技术的应用前景。     

高温相变蓄热材料研究进展

本文通过对高温相变蓄热材料国内外研究现状进行分析,提出探索高温相变蓄热过程热力学行为特性,建立热-结构耦合分析模型,并与实验研究相结合,是弄清相变过程热力学机理、掌握相变蓄热技术、进行吸热/蓄热器和热控系统以及相变蓄热容器合理设计的关键,并将为最终在太阳能发电、高温热能回收、航天以及冶金等其它工业领域的技术应用奠定基础。     

高温相变电蓄热供暖装置的研究

对比了目前北方几种常见的供暖方式,总结了电蓄热供暖的特点。采用铝硅合金作为相变材料,设计了一种高温相变电蓄热供暖装置,并对其蓄热和热能输出特性进行了研究分析。     

被动式蓄热相变墙体热工性能的研究

选用石蜡与液态石蜡的二元混合物作为相变材料,按不同比例复合在墙体中,制成被动式蓄热相变墙体.实验分析了不同比例相变材料复合相变墙体的传热性能和节能效果,并与普通墙体进行比较,优选出相变材料最适合的复合比例.结果显示:在加热阶段,不同比例相变材料制备的相变墙体表面温度和热流均小于普通墙体,且温度和热流变化平缓、波动小,存在延迟和衰减现象;在停止加热阶段,普通墙体的温度和热流很快下降,而相变墙体表面温度和热流下降较为缓慢.试验数据为相变墙体的实际应用提供基础和依据.     

研究高温相变蓄热技术在建筑采暖中的运用效果

随着我国绿色经济和节能经济的不断推行,对于社会建设项目的节能要求有了进一步的提高。在建筑项目的开发和建设当中,采暖是一项重要的设计内容,而要让建筑的采暖达到节能的要求,主要目的就是要实现建筑采暖的实时性。换言之就是在建筑需要采暖的时候进行热能的补充,在不需要的时候进行热能的储存。在不断对技术研究和运用中发现,高温相变蓄热技术可以有效的达到这一目的,所以本文对其在建筑采暖当中的具体应用效果进行详细分析,目的就是要全面认清技术优势,从而加强其利用。     

相变蓄热装置热性能测试方法比对研究

本文客观比较了《Method of Testing Active Latent-Heat Storage Devices Based on Thermal Performance》(ASHRAE Standard 94.1-2010)与我国的 《无内置热源相变蓄热装置》(T/CECS 10023-2019)在测试对象的范围,实验室条件约束,实验装置,测试方法流程,以及测试指标这几个重要方面的差异,为相关从业者充分理解此类产品热性能测试方法提供了参考.     

电加热相变蓄热地板供暖房间热特性数值模拟与分析

介绍了电加热相变蓄热地板供暖的优点，综合考虑室外气象因素、室内辐射特性和相变材料自身的热物性建立了电加热相变蓄热地板供暖系统的计算模型。比较了相变蓄热地板与传统散热器供暖的热舒适性和能耗，结果表明相变蓄热地板能够改善室内热舒适性和降低能耗。     

空气源热泵相变蓄能除霜方式的实验研究

以目前广泛使用的空气源热泵分体式房间空调器为研究对象,建立了空气源热泵相变蓄热逆循环除霜系统的动态实验台,对系统运行中的结霜过程进行描述,并对空气源热泵与蓄热器之间不同连接方式的除霜情况进行比较分析,总结得出了性能较高的蓄能除霜方式。     

相变储能水箱研究综述

对近些年来相变储能水箱的研究进行了回顾,根据相变储能水箱外观结构、相变材料安装方式、换热方式和辅助热源布置方式的不同,对相变储能水箱进行了分类。对相变储能水箱的热工性能、影响因素、研究方式和实验结论等进行了整理和分析,并归纳了不同材料结构和运行工况对相变储能水箱性能的影响,指出了目前相变储能水箱研究内容的不足。     

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.     

Experimental analysis of thermal performance of evacuated tube solar air collector with phase change material for sunshine and off-sunshine hours

An experimental investigation of an evacuated tube solar air collector coupled to a latent thermal energy store for generating hot air when no solar radiation is incident was undertaken. Acetamide was used as a phase change material (PCM). The latent thermal energy store was integrated with the manifold of the solar collector and water was used as the working fluid transferring solar gain to the air being heated. The maximum measured temperature differential between the heated air and the ambient air was 37°C and 20.2°C during conditions of incident and non-incident solar radiation, respectively. This occurred using a circular fin configuration at a flow rate of 0.018?kg?s^?1. The efficiency at low (0.018?kg?s^?1) air flow rates was 0.05–0.50 times less as compared to high (0.035?kg?s^?1) air flow rates. This system has advantages over systems using sensible storage as it can be used after sunset due to better heat storing capacity of the PCM.     

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。     

相变储能微胶囊的制备和表征

以石蜡为囊芯,脲醛树脂为囊壁,采用原位聚合法制备具有相变储能功能的微胶囊,并研究了乳化剂、芯壁质量比以及搅拌速度等对微胶囊制备和性能的影响.结果表明,以司班-80和吐温-80复配作为乳化剂、用量为石蜡的8%,芯壁质量比为1.2:1,转速为1500r/min时,制备的微胶囊性能较好.研究表明,脲醛树脂可有效包覆石蜡,形成粒径分布较均匀的相变储能微胶囊,可用于制备储能建筑材料.     

蓄热式电采暖散热器热工性能提升分析及使用注意事项

2000年起,北京市先后开展了核心区和农村地区的"煤改电"。蓄热式电采暖散热器是最为清洁的供暖技术之一,其热工性能对保证"煤改电"项目的实施效果具有重要意义。本文从蓄热式电采暖散热器工作原理及传热学基础理论出发,分析了其热工性能的影响因素及提升方式,并提出蓄热式电采暖散热器使用中的注意事项。