一种新的热能地下存储技术

分析了目前热能地下储热技术的现状,提出了用混凝土储热桩（仓）来存储热能,指出了技术方法的可行性。     

利用地下蓄水层蓄热的清洁能源技术

本文介绍了日本山形大学有关地下蓄水层蓄热研究的基本原理，研究概况及最新动态，这一技术的研究对于环境保护、开发可持续利用的能源具有非常重要的现实价值，在我国北方更具有广阔的应用前景。     

Heat Transfer Enhancement for PCM Thermal Energy Storage in Triplex Tube Heat Exchanger

Thermal energy storage is critical for reducing the discrepancy between energy supply and energy demand, as well as for improving the efficiency of solar thermal energy systems. Among the different types of thermal energy storage, phase-change materials (PCM) thermal energy storage has gained significant attention recently because of its high energy density per unit mass/volume at nearly constant temperature. This study experimentally investigates the using of a triplex tube heat exchanger (TTHX) with PCM in the middle tube as the thermal energy storage to power a liquid desiccant air-conditioning system. Four longitudinal fins were welded to each of the inner and middle tubes as a heat transfer enhancement in the TTHX to improve the thermal performance of the thermal energy storage. The average temperature of the PCM during the melting process in the TTHX with and without fins was compared. The PCM temperature gradients in the angular direction were analyzed to study the effect of the natural convection in the melting process of the thermal storage. The energy storage efficiency of the TTHX was determined. Results indicated that there was a considerable enhancement in the melting rate by using fins in the TTHX thermal storage. The PCM melting time is reduced to 86% by increasing of the inlet heat transfer fluid. The average heat storage efficiency calculated from experimental data for all the PCMs is 71.8%, meaning that 28.2% of the heat actually was lost.     

Experimental Analysis of a Solar Energy Storage Heat Pump System

This paper introduces a novel solar-assisted heat pump system with phase change energy storage and describes the methodology used to analyze the performance of the proposed system. A mathematical model was established for the key parts of the system including solar evaporator, condenser, phase change energy storage tank, and compressor. In parallel to the modelling work, an experimental set-up of the proposed solar energy storage heat pump system was developed. The experimental data showed that the designed system is capable of meeting cold day heating demands in rural areas of Yanbian city located in Jilin province of China. In day-time operation, the solar heat pump system stores excess energy in the energy storage tank for heating purposes. A desired indoor temperature was achieved; the average coefficient of performance of solar heat pump was identified as 4.5, and the system showed a stable performance throughout the day. In night-time operation, the energy stored in the storage tank was released through a liquid-solid change of phase in the employed phase-change material. In this way, the provision of continuous heat for ten hours was ensured within the building, and the desired indoor air conditions were achieved.     

Exergy Analysis of Solar Still with Sand Heat Energy Storage

This paper studies the experimental and exergy analysis of solar still with the sand heat energy storage system. The cumulative yield from solar still with and without energy storage material is found to be 3.3 and 1.89 kg/m², respectively for 8-h operation. Results show that the exergy efficiency of the system is higher with the least water depth of 0.02 m (m_w = 20 kg). Competitive analysis of second law efficiency shows that the exergy efficiency improves the system by 30% than conventional single slope solar still without any heat storage. The maximum exergy efficiency with energy storage material is found as 13.2% and it is less than the conventional solar still without any material inside the basin.     

显热/潜热复合储能材料的研究

描述了Na2CO3-BaCo3/MgO和Na2SO4/SiO2这两种无机盐／陶瓷体显热／潜热复合储能材料的配方、制备工艺和热性能研究结果,讨论了无机盐在多孔陶瓷体微结构内的容积份额与成型压力,烧结温度,升温速度,保温时间以及不同的添加剂的朴素关系,测试结果表明,研制材料的性能达到了预期的结果,给出了可行的配方和制备工艺。     

太阳能相变蓄热水箱性能实验研究

利用相变材料蓄热是提高太阳能系统效率的重要途径之一。为对比分析含相变材料蓄热水箱的性能,选用三水合乙酸钠,搭建了一套蓄热水箱实验系统,在初始水温为80℃、进水温度为20℃的工况下,对比分析不同进口流量下(2、6和10 L/min)相变蓄热水箱的热特性。实验结果表明:相变蓄热水箱的蓄热量较普通水箱增加了1.4%;随着流量的增加,水箱的混合数先减小后增大,火用效率逐渐降低,相变蓄热水箱的填充效率先增大后减小,且在6 L/min时达到最大值0.905。     

分区蓄热水箱应用于太阳能热泵中的蓄放热分析

针对冬季太阳能辐射弱且不稳定的特点,提出一种应用于太阳能热泵的分区蓄热水箱,以水泵驱动蓄热水箱循环区与蓄热区的热量传递,并运用热力学原理对水箱循环区与蓄热区的运行状况进行模拟,分析了水箱两区在不同水泵体积流量下的逐时温度变化并与整体式水箱进行对比。结果表明,分区蓄热水箱克服了整体式水箱的热惰性,启动灵活,能在较短时间内达到热泵运行的理想温度,显著提高了系统的性能。     

蓄能、热回收技术及其在空调工程中的应用

本文描述了蓄能与热回收技术，分析了这些技术的主要影响因素，阐明了它们在空调系统工程中的重要作用。文章指出工程技术人员在设计空调系统时必须合理地应用这些技术，使空调系统的能耗减小，从而对环境的影响减少到最小，这样才能做到节能与环保并重。     

以空气为携热介质的开式太阳能蓄能热泵循环研究与分析

以空气为携热介质的开式太阳能吸收式热泵系统为研究对象，在原有制冷循环基础上，根据冬季蓄能热泵循环运行特点对系统进行改进；并以西安地区为例对循环进行计算和分析，探讨其蓄能情况和影响系统工作性能的因素。     

一种电热固体蓄热装置蓄热过程的数值模拟

本文对10kW电热固体蓄热装置的蓄热过程进行了数值模拟,在将蓄热固体颗粒和粒子间的空气看作均相介质的假设基础上,建立了蓄热过程中蓄热体内径向传热模型,根据初始条件和边界条件进行了数值计算,分析了误差产生可能原因,并利用有效导热系数分析了数值解和实验结果之间的误差。     

等温压缩空气储能系统液气传热特性研究

等温压缩空气储能（I CAES）无需补燃、能源利用率高且碳排放低,在大规模储能领域具有重要应用前景。在建立喷雾的I CAES系统的液气传热模型基础上,通过数值方法分析了喷雾流量对I CAES液气传热特性的影响规律。结果表明：采用喷雾方法能够有效抑制压缩和膨胀过程的温度变化、强化液气传热并实现理想I CAES过程;增大喷雾流量能够降低压缩功耗、提高膨胀做功并降低停机储气过程压损,可提高系统指示效率和储能效率。     

Long-term Energy Storage Challenge

正Energy storage is the capture of energy produced at one time for use at a later time.Storage devices are crucial to expanding the wind and solar industries and reducing pollution because they allow the energy that is generated now to be consumed later.One of those storage technologies we most likely think of is the battery storage technology.     

Development and Testing of an Energy Storage Material/Phase Change Material Enhanced Heat Sink

A concept of using energy storage material (ESM) or phase change material (PCM) to enhance the heat transfer dissipation by a conventional compact fin-based heat sink is demonstrated. An actual design is developed, fabricated, and tested to demonstrate the heat transfer enhancement. The heat sink is light weight (made with Aluminum) and miniature in size with a total fin length of 26 mm. Test results demonstrated that under a high peak load (4.4 W/cm²) and low duty power cycle (30/55 on/off ratio with a period of 85 sec), the peak temperature at the heating surface with the ESM/PCM heat sink is 5°C lower than that of a conventional heat sink. At the tip of the fin, the peak temperature with the ESM/PCM heat sink is 3°C lower than that of a conventional heat sink. When the external heat transfer coefficient increases (with increase air velocity), the impact of the PCM/ESM on the heat transfer performance is less. A numerical model, based on COMSOL, is developed to provide a theoretical understanding of the experimental observation.     

间歇性可再生能源发电中的储能技术研究

可再生能源发电是一种新兴技术,但存在供电有间歇性以及供电不稳定的问题.储能技术是解决这一问题最有效的办法.分析了不同的储能系统,阐述了其各自的主要工作原理和优缺点.     

Large Scale Energy Storage for Renewable Energy

<正>As the energy demand and the concern on the environmental impact progressively increase,the renewable energy collected from renewable resources such as sunlight,wind,and tides,plays a more and more important role in providing energy for our daily lives and reducing greenhouse gas emissions. One of the problems associated with the renewable energy sources is their variability. For example,solar and wind power tend to fluctuate based upon whether     

电能加热暖棚蓄热法高原冬季混凝土施工技术

为了满足高原严寒地区水利水电援建项目抢工期的需要,西藏旁多水利枢纽工程的发电厂房工程采用电能加热、暖棚蓄热的冬季混凝土施工方法,取得了良好社会、经济、质量和进度效益。该方法具有热效率高、操作简便、质量可靠、节能环保等优点,是适合高原特点的冬季混凝土施工方法,可以在类似工程推广应用。     

采用肋片强化相变蓄热器传热的模拟分析

为了增加同心套管式相变蓄热器的蓄能效果,采用环形肋片强化相变储能设备的传热,利用Fluent软件模拟了这种结构中石蜡相变的融化过程,得到了石蜡熔化过程温度场分布及熔化时间的规律,根据这些规律分析了肋片间距及厚度等参数对贮热管放热效果的影响。分析结果表明：石蜡的总融化时间随肋片间距增加而延长即传热效果变差,但是随着肋片厚度的增加而缩短,即传热效果变优,但是当或肋间距超过40mm和厚度超过2mm后,进一步增加肋片间距或者厚度对传热效果的影响变得不明显。