Incorporation of controllable supercooled phase change material heat storage with a solar assisted heat pump: Testing of crystallization triggering and heating demand-based modelling study
Incorporation of controllable supercooled phase change material heat storage with a solar assisted heat pump: Testing of crystallization triggering and heating demand-based modelling study
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DOI：
10.1016/j.est.2022.105744
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发表时间：
2022-11
影响因子：
9.4
通讯作者：
C. Kutlu;Emmanuel Tapia-Brito;O. Agbonaye;Yuehong Su;S. Smith;B. Hughes;S. Riffat
中科院分区：
文献类型：
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作者：
C. Kutlu;Emmanuel Tapia-Brito;O. Agbonaye;Yuehong Su;S. Smith;B. Hughes;S. Riffat
在短期到长期的热存储中，普通相变材料（PCM）系统的热损失是一个大问题，其中热量连续地损失到周围环境中，因此即使当系统不使用时也被浪费。在所提出的系统中的可控过冷PCM提供了一个解决这个问题的方案。潜热仅在过冷PCM被触发以诱导结晶时释放，因此其可以在环境温度下储存。为了控制热量的释放，该装置将被构造为一组PCM存储单元，每个单元都有自己的触发器，可以根据建筑物的供暖需求激活，可能需要几天。所提出的多功能PCM能量存储系统可以在短期到长期（天/周）的基础上在同步能量需求和供应方面发挥重要作用。在这项研究中，电触发机制的构建和测试在实验室中控制PCM的结晶。PCM温度在触发后20 s内从20° C上升到56.4° C。在验证了可控结晶和熔化时间后，考虑到英国诺丁汉生态住宅的供暖需求曲线，模拟了太阳能辅助热泵与过冷PCM存储单元的耦合。当采用直径为8 cm的PCM管时，PCM罐的充电时间为6.5h。在排放期间，考虑到建筑物的一天加热曲线，热水供应温度达到43 °C以上。
In short to long-term heat storage, the heat loss of common phase change material (PCM) systems is a big problem where heat is lost continuously to the ambient environment and is thus wasted, even when the system is not in use. Controllable supercooled PCM in the proposed system offers a solution to this problem. Latent heat is only released when the supercooled PCM is triggered to induce crystallization, so it can be stored at ambient temperature. To control the release of heat, the installation will be constructed as a group of PCM storage units, each with its own trigger, which can be activated according to the heating demand of a building perhaps over several days. The proposed versatile PCM energy storage system can play an essential role in synchronizing energy demand and supply, on a short to long-term basis (days/weeks). In this study, an electrical triggering mechanism is constructed and tested in the laboratory to control the crystallization of the PCM. The PCM temperature increased from 20°Cto 56.4°Cin 20s after triggering. After validation of controllable crystallization and melting time, a solar-assisted heat pump coupled with supercooled PCM storage units was simulated considering the heating demand profile of an eco-house in Nottingham, UK. The charging time of the PCM tank was found 6.5h when 8 cm diameter PCM tubes were adapted. During discharging period, the hot water supply temperature was achieved at higher than 43 °C, considering the one-day heating profile of the building.