PCM蓄热器的蒸汽充放电

IF 0.3 Q4 MULTIDISCIPLINARY SCIENCES Momona Ethiopian Journal of Science Pub Date : 2018-05-17 DOI:10.4314/mejs.v10i1.2
A. Tesfay, M. Kahsay, O. Nydal
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引用次数: 0

摘要

潜热储存和高效热传输技术有助于利用间歇太阳能进行连续和近等温应用。然而,许多潜热储存面临着储存充电、保温和释放储存热量的挑战。本文试图解决热运输和储热充放电问题的挑战。从接收器到厨房的一定距离的热传输是用不锈钢管道和水作为传热流体进行的。然而,充放电过程是在翅片的帮助下通过传导方法进行的。此外,通过使用气凝胶隔热材料,储存的热量可以保持大约一两天。潜热储存在相变材料(PCM)、硝酸盐(60%NaNO3和40%KNO3的混合物)中,该材料在222℃下熔化,具有109焦耳/克的比热。该储存器能够储存高达250摄氏度的热量,并在液固相转变的烘焙过程中等温提供热量。然而,储存在PCM的固体和液体形式中的显热用于执行不需要均匀热量的额外应用,包括面包烘焙、kita(大煎饼)烘焙和水煮。PCM的低热导率通过使用连接到烤盘并向内挤压到存储器的延伸铝翅片而得到增强。本文使用蒸汽的两相回路热虹吸管来管理接收器(室外)和存储器(室内)之间所需的长距离热传输。热虹吸管流中的蒸汽被限制在250摄氏度的最高工作温度。选择蒸汽是因为它具有最高的热容量、可用性和稳定的性质。它从收集器的焦点处携带热量,并在一个埋在储物箱顶部铝板中的盘管中冷凝。许多散热片牢固地连接到该板上,以便在充电期间将热量传导到存储器内的PCM。这种设计配置避免了PCM存储器内部的压力发展,充放电温度记录在存储器的三个区域(顶部、中间和底部)。实验和数值结果表明,传热、保温和充放电方法是有效的。关键词:太阳能,相变储能,潜热储能,两相热虹吸管。
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Steam-based Charging-Discharging of a PCM Heat Storage
Latent heat storage and efficient heat transport technology helps to utilize the intermittent solar energy for continuous and near isothermal  applications. However, many latent heat storages face challenges of storage charging, heat retaining, and discharging the stored heat. This paper tries to address the challenges of heat transportation and storage charging-discharging issues. The heat transportation from the receiver over some distance, from outside to the kitchen, is carried out with a stainless pipeline and water as heat transfer fluids. However, the  charging-discharging process is carried by conduction method with the help of fins. In addition, the stored heat is retained for about one-two days by using aerogel insulation. The latent heat is stored in a phase change material (PCM), nitrate salt (mixture of 60% NaNO 3 and 40% KNO 3 ), which melts at 222oC and has 109 J/g specific heat of fusion. The storage has the capacity of storing up to 250oC heat and supply this heat isothermally during baking in the liquid-solid phase transition. However, the sensible heat stored in the solid and liquid form of the PCM is used to perform additional applications that do not require uniform heat which includes bread baking, kita (large pancake) baking and water boiling. The low thermal conductivity of PCM is enhanced by using extended aluminum fins that are attached to the baking plate and extruded inward to the storage. In this paper, two-phase loop thermosyphon of steam is used to manage the long distance heat transportation required between the receiver (outside) and the storage (inside a house). The steam in the thermosyphon flow has restricted to a maximum working temperature of 250oC. Steam is selected for its highest heat capacity, availability and stable nature. It carries heat from the collector focus point and condenses in a coiled pipe imbedded in aluminum plate placed on top of the storage. Many fins are solidly attached to this plate to conduct the heat down to the PCM inside the storage during charging. This design configuration avoids pressure development inside the PCM storage and the charging-discharging temperature is recorded in three zones (top, middle and bottom) of the storage. The experimental and numerical results show that the heat transportation, retention and charging-discharging methods are effective. Keywords : Solar energy, PCM storage, Latent heat storage, Two-phase thermosyphon.
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来源期刊
Momona Ethiopian Journal of Science
Momona Ethiopian Journal of Science MULTIDISCIPLINARY SCIENCES-
自引率
0.00%
发文量
13
审稿时长
12 weeks
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