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Hybrid thermal storage using coil-encapsulated phase change materials

机译：使用线圈封装相变材料的混合蓄热

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Compact thermal storage using a hybrid phase change material (PCM) store for domestic heating applications is investigated. The primary focus is on thermal demand during the electrical grid-stress period (16:00 h-20:00 h on winter weekdays) when the primary heat source, a heat pump, is turned off. Though this phenomenon may be evident in other countries, the main focus of this work is on electrical grid stress in UK conditions. In this work, PCM encapsulated in pipe coils surrounded by water in a hot water storage tank is considered. Two alternative samples of salt hydrate are evaluated experimentally and the results are used to inform system modelling. A new model is proposed for relating the enthalpy and temperature of the PCM during melting and solidification. A compact hybrid store design is proposed and a detailed thermal model of the hybrid store with an air-source heat pump is constructed and applied to an example house. Seasonal energy results compared with a conventional water tank are broadly similar but the hybrid store offers better comfort tracking during grid stress periods average house temperatures falling below 19 degrees C for 22.7% of the time with a conventional store but only 5.8% of the time using the hybrid store. (C) 2017 Elsevier B.V. All rights reserved.
机译：研究了使用混合相变材料（PCM）的紧凑型蓄热器，用于家庭供热应用。主要关注的是电网压力时段（冬季工作日的16:00 h-20：00 h）中的热需求，这时主要的热源（热泵）已关闭。尽管这种现象在其他国家可能很明显，但这项工作的主要重点是英国条件下的电网压力。在这项工作中，考虑了将PCM封装在热水储罐中被水包围的盘管中。实验评估了两个替代的水合物盐样品，并将结果用于系统建模。提出了一种新的模型，用于关联熔化和凝固过程中PCM的焓和温度。提出了紧凑型混合商店设计，并构建了带有空气源热泵的混合商店的详细热模型，并将其应用于示例房屋。与传统储水箱相比，季节性能量结果大致相似，但混合储能在电网压力期间提供更好的舒适度跟踪，传统储藏室的平均房屋温度下降到19摄氏度以下的时间为传统储水箱的22.7％，但使用储水箱的时间仅为5.8％混合商店。 （C）2017 Elsevier B.V.保留所有权利。

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