Research on Heat Storage and Release Characteristics of Solid Heat Storage Materials in Low-Pressure Environments

doi:10.12096/j.2096-4528.pgt.24071

Abstract

Abstract:

Objectives When solid heat storage devices are applied in high-altitude areas, the thin air leads to significant variations in their heat storage and release performance. To address this, a method for testing the heat storage and release characteristics of solid heat storage materials in low-pressure environments in high-altitude areas is proposed. Methods A test bench for low-pressure environment simulation is constructed, consisting of an air loop unit, a water loop unit, and a data acquisition unit. Heat storage and release tests are conducted on a heat storage unit composed of two heat storage bricks under pressures ranging from 40 kPa to 101 kPa. By recording the inlet air temperature and the temperature variations of the heat storage bricks, the heat storage and release rates of the heat storage materials in low-pressure environments are analyzed, and the heat transfer performance between the air and heat storage bricks under different pressures is compared. Results Compared to the 101 kPa condition, the heat storage time increases significantly under both 80 kPa and 40 kPa conditions, with lower air pressure requiring longer heat storage time. Additionally, the average heat storage rates of the heat storage bricks at 80 kPa and 40 kPa decrease by approximately 15% and 55%, respectively. During heat release, the heat release time increases by 26.1% at 80 kPa and 135.4% at 40 kPa. Conclusions Air pressure significantly affects the heat storage and release rates of heat storage bricks, the experimental results can provide guidance for the design of solid heat storage devices applied in high-altitude areas.

Key words: renewable energy, energy storage, heat storage materials, heat storage characteristics, heat release characteristics, temperature distribution, heat storage technology

CLC Number:

TK 02

Mengdong CHEN, Wei KANG, Zhanfeng DENG, Wenqiang ZHAO, Guobin LEI. Research on Heat Storage and Release Characteristics of Solid Heat Storage Materials in Low-Pressure Environments[J]. Power Generation Technology, 2025, 46(6): 1184-1191.

Figures/Tables 12

Fig. 1 Test bench principle and test point arrangement

Tab. 1 Test instruments and their precision

序号	测量仪表	量程与精度
1	K型热电偶	测量温度范围：0~600 ℃ 精度：±1 ℃
2	空气流量计	流量范围：0~100 m³/h 精度：1.5级
3	真空计	绝对压力范围：0~1 bar 精度：1.5级
4	PT100热电阻	水温度范围：0~100 ℃ 精度：±0.5 ℃
5	水流量计	流量范围：0⁓1 m³/h 精度：±1.5%

Fig. 2 Schematic diagram of heat storage brick structure

Fig. 3 Photos of test bench

Tab. 2 Operating conditions for heat storage tests

工况	压力/kPa	加热丝分阶段加热温度/℃	实验起始温度/℃
1	101	90~170~250	45
2	80	90~170~250	48
3	40	90~170~250	49
4	40	550	45

Tab. 3 Operating conditions for heat release tests

工况	压力/kPa	实验起始温度/℃	释热空气入口温度/℃
5	101	230	30
6	80	224	30
7	40	225	30
8	40	347	30
9	40	432	30

Fig. 4 Variation curves of heat storage brick temperature, heat storage capacity, and heat transfer per unit area over time in heat storge mode

Fig. 5 Variation curve of heat storage brick temperature over time in heat release mode

Fig. 6 Variation curves of heat storage temperature under different atmospheric pressures

Fig. 7 Comparison of average heat storage capacities during various heat storage stages under different atmospheric pressures

Fig. 8 Variation curve of heat release temperature of heat storage brick temperature under different atmospheric pressures

Fig. 9 Comparison of heat release capaties of heat storage bricks under different atmospheric pressures

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