Jančík Petr, Schmirler Michal, Hyhlík Tomáš, Bláha Adam, Sláma Pavel, Devera Jakub, Kouba Jan
Department of Fluid Dynamics and Thermodynamics, Faculty of Mechanical Engineering, Czech Technical University in Prague, Technická 4, 160 00, Prague, Czech Republic.
Sci Rep. 2021 Dec 1;11(1):23267. doi: 10.1038/s41598-021-02705-1.
Heat storage efficiency is required to maximize the potential of combined heat and power generation or renewable energy sources for heating. Using a phase change material (PCM) could be an attractive choice in several instances. Commercially available paraffin-based PCM was investigated using T-history method with sufficient agreement with the data from the manufacturer. The introduced LHTES with cylindrical capsules is simple and scalable in capacity, charging/discharging time, and temperature level. The overall stored energy density is 9% higher than the previously proposed design of similar design complexity. The discharging process of the designed latent heat thermal energy storage (LHTES) was evaluated for two different flow rates. The PCM inside the capsules and heat transfer fluid (HTF) temperature, as well as the HTF flow rate, were measured. The lumped parameter numerical model was developed and validated successfully. The advantage of the proposed model is its computational simplicity, and thus the possibility to use it in simulations of a whole heat distribution network. The so-called state of charge (SoC), which plays a crucial role in successful heat storage management, is a part of the evaluation of both experimental and computational data.
蓄热效率对于最大限度发挥热电联产或可再生能源供热的潜力至关重要。在多种情况下，使用相变材料（PCM）可能是一个有吸引力的选择。采用T历史法对市售石蜡基相变材料进行了研究，结果与制造商提供的数据高度吻合。引入的带有圆柱形胶囊的潜热蓄热系统（LHTES）在容量、充放电时间和温度水平方面简单且可扩展。总体储能密度比之前设计复杂度相似的设计高出9%。针对两种不同流速对所设计的潜热蓄热系统（LHTES）的放热过程进行了评估。测量了胶囊内部的相变材料和传热流体（HTF）的温度以及传热流体的流速。成功开发并验证了集总参数数值模型。所提出模型的优点在于其计算简单，因此有可能将其用于整个热分配网络的模拟。所谓的荷电状态（SoC）在成功的蓄热管理中起着关键作用，它是实验和计算数据评估的一部分。
