Study on heat transfer of phase change materials imbedded in a concrete wall

doi:10.19799/j.cnki.2095-4239.2020.0254

Abstract

Abstract:

Adding phase change materials (PCMs) to building envelopes is an effective method to reduce the heat transfer between the outdoor and indoor environments. PCMs are materials that can change their phase by absorbing or releasing large amounts of energy, which prevents a large temperature variation. The utilization of PCMs in building envelopes realizes this heat transfer regulation between the indoor and outdoor environments. This paper reports the use of PCMs with a phase change temperature of 25 ℃ encapsulated in hollow HDPE balls with inner diameter of 24 mm and outer diameter of 25 mm. The PCM balls were evenly distributed in a concrete panel with dimensions of 880 mm×500 mm to form a PCM-concrete layer. Outdoor solar radiation was simulated using an electrical heating film. The thermal performance of walls with a PCM-concrete layer at various positions in a building envelope were measured and simulated using Ansys software. The effective thermal conductivity of the PCM-concrete layer was calculated to evaluate the thermal performance of the walls. It was found that when the solar radiation is less than 80 W/m² or greater than 200 W/m², the effective thermal conductivity is lowest when the PCM-concrete layer is adjacent to the interior surface. When the solar radiation is between these values, it is more effective to place the PCM-concrete layer adjacent to the exterior surface to allow the PCM to absorb heat and achieve better thermal performance.

Key words: phase change material, heat transfer through building envelope, interior surface temperature, thermal performance, effective thermal conductivity

CLC Number:

TU 86

Hang TU, Hang ZHANG, Lihui LIU, Jie LI, Xiaoqin SUN. Study on heat transfer of phase change materials imbedded in a concrete wall[J]. Energy Storage Science and Technology, 2021, 10(1): 287-294.

Figures/Tables 13

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材料	密度/kg·m^-3	导热系数 /W·(m·℃)^-1	比热容 /kJ·(kg·℃)^-1	厚度 /mm	数量
石膏板	762	0.330	1.017	8	2
混凝土板	2330	1.2	0.97	40	2
HDPE外壳	970	0.49	2.25	1	1
电加热片	—	—	—	0.37	1

设备	型号	测量精度	测量范围
热电偶	TT-T-30-SLE	±0.5 ℃	0～350 ℃
热流计	RLJ-10050A	≤2.0 W/(m²·mV)	—
无纸记录仪	MIK-8100	≤0.0041%	—

墙体	辐射强度					误差模拟平均值
墙体	40 /W·m^-2	80 /W·m^-2	120 /W·m^-2	160 /W·m^-2	200 /W·m^-2	误差模拟平均值
组合墙体1	4.57%	1.5%	0.9%	2.74%	3.14%	2.57%
组合墙体2	3.6%	1.9%	1.6%	2.8%	4.5%	2.88%
组合墙体3	3.1%	2.02%	0.65%	1.69%	2.46%	1.98%

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