Experimental study on the performance of capillary phase-change energy storage tank for civil building

doi:10.19799/j.cnki.2095-4239.2023.0142

Abstract

Abstract:

The growing adoption of valley power and solar thermal utilization in civil construction has become crucial for the development and application of phase-change energy storage tanks. To address this need, this study focuses on the theoretical analysis of internal heat transfer in phase-change energy storage devices. It designed a phase-change energy storage tank for civil buildings, featuring a high-efficiency capillary heat exchanger as the core component. Furthermore, a performance testing experimental system was built to assess the thermal characteristics of the tank. Real-time temperature response data from industrial phase-change materials are recorded and analyzed to investigate the influence of the inlet temperature, flow rate, and flow direction of the hot and cold water on the thermal performance of the phase-change energy storage tank. The results show that compared to gravity flow at the same inlet temperature and flow rate, the heat transfer of the heat transfer fluid in counter-gravity flow is 1.1—1.2 times more efficient. Flow rate dominates the heat storage stage, while the inlet temperature considerably impacts the heat release stage. However, under the low flow rate condition, the outlet water temperature exhibits better continuous stability. For fulfilling the functional requirements of faster heat storage with a larger capacity and slower heat release with higher water temperature, it is recommended to set the inlet temperature of the working medium during the heat storage stage at 70—75 ℃. The recommended flow rate for the working medium in the capillary tube is 0.025—0.035 m/s. During the exothermic stage, the recommended flow rate in the capillary is within 0.020 m/s. In practical usage, a single unit of heat storage, operating twice under conditions of 30 ℃ and 85 L/h effluent, can meet the intermittent heating needs of a 20 m² room for one day and provide showering capacity for at least three people. This study provides valuable insights into the engineering application design and evaluation of domestic energy storage tanks.

Key words: energy storage tank, experimental study, phase change material, thermal storage and release performance, civil building

CLC Number:

TU 833

Min ZHAO, Yang LI, Jie CAI, Weibin KANG, Lei LIU. Experimental study on the performance of capillary phase-change energy storage tank for civil building[J]. Energy Storage Science and Technology, 2023, 12(8): 2626-2637.

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参数	数值
熔点/℃	50～55
潜热/(kJ/kg)	181.0
比热容/[J/(kg·K)]	2000(固)
热导率/[W/(m·K)]	0.2(固)
密度/(kg/m³)	0.907(固)/0.764(液)
体积膨胀系数/K^-1	0.1577

序号	蓄热工况				放热工况
序号	进水温度/℃	流速/(m/s)	流量/(L/h)	流动方向	进水温度/℃	流速/(m/s)	流量/(L/h)	流动方向
X1/F1(实验组)	65	0.025	142	自下而上	25	0.020	114	自下而上
X2/F2(对照组)	70	0.025	142	自下而上	30	0.020	114	自下而上
X3/F3(实验组)	75	0.025	142	自下而上	35	0.020	114	自下而上
X4/F4(实验组)	70	0.015	85	自下而上	30	0.015	85	自下而上
X5/F5(实验组)	70	0.035	199	自下而上	30	0.025	142	自下而上
X6/F6(实验组)	70	0.025	142	自上而下	30	0.025	114	自上而下

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