Form‐stable Na 2 SO 4 ·10H 2 O‐Na 2 HPO 4 ·12H 2 O eutectic/hydrophilic fumed silica composite phase change material with low supercooling and low thermal conductivity for indoor thermal comfort improvement

2020 ◽  
Vol 44 (4) ◽  
pp. 3171-3182 ◽  
Author(s):  
Yutang Fang ◽  
Jianmin Su ◽  
Yufeng Tang ◽  
Xianghui Liang ◽  
Shuangfeng Wang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Comfort ◽  
Phase Change ◽  
Phase Change Material ◽  
Fumed Silica ◽  
Low Thermal Conductivity ◽  
Indoor Thermal Comfort ◽  
Silica Composite ◽  
Composite Phase Change Material ◽  
Change Material

Sodium acetate–urea composite phase change material used in building envelopes for thermal insulation

2017 ◽  
Vol 39 (4) ◽  
pp. 475-491 ◽  
Author(s):  
Yin Zhang ◽  
Xin Wang ◽  
Zhiyuan Wei ◽  
Yinping Zhang ◽  
Ya Feng
Keyword(s):  
Energy Consumption ◽  
Thermal Comfort ◽  
Phase Change ◽  
Phase Change Material ◽  
Thermal Insulation ◽  
Sodium Acetate ◽  
Building Envelopes ◽  
Indoor Thermal Comfort ◽  
Composite Phase Change Material ◽  
Change Material

Integrating phase change material with building envelopes is an effective way to reduce cooling or heating loads, improve indoor thermal comfort and save building energy consumption. In this paper, the composite phase change material of sodium acetate and urea is prepared and its thermal–physical properties with different mixing mass ratios are investigated through experiment and T-history method. Moreover, the heat transfer model of building envelopes with phase change material is established and different phase change material locations in external walls for thermal insulation are compared based on integrated uncomfortable degree. The results show that (1) with rising urea mass fraction, both phase change temperature and latent fusion heat (enthalpy) decline; (2) strontium sulfate is an effective nucleating additive to decrease super-cooling degree for such phase change material solidification and (3) to improve indoor thermal comfort, it is preferable to put phase change material in the middle of external walls. Furthermore, the illustrative example of an office building in Chengdu indicates that phase change material insulation can lead to time lag and decrement for indoor air temperature variations. It also indicates that after inserting such phase change material into building external wall, the highest indoor temperature can be decreased by 7℃, leading to 60% cooling energy saving in one typical summer day. This work can provide guidance for building thermal design with phase change materials. Practical application:The studied sodium acetate–urea composite phase change material has been used as energy storage and thermal insulation materials inserted in envelopes for the demonstration project of low/zero energy consumption passive buildings in China.

Effect of the Additive on Thermal Conductivity of the Phase Change Material

2011 ◽  
Vol 399-401 ◽  
pp. 1302-1306 ◽  
Author(s):  
Wei Hua Li ◽  
Jin Feng Mao ◽  
Li Jun Wang ◽  
Lu Yan Sui
Keyword(s):  
Thermal Conductivity ◽  
Phase Change ◽  
Phase Change Material ◽  
Sodium Acetate ◽  
Heat Storage ◽  
Expanded Graphite ◽  
Sodium Acetate Trihydrate ◽  
Acetate Trihydrate ◽  
Composite Phase Change Material ◽  
Change Material

The aim of the paper is to analyze the effect of the additives on thermal conductivity of the phase change material. The experiment about heat storage and heat release performance of the composite phase change material which uses sodium acetate trihydrate as host material is studied. The effect of the expanded graphite on the composite phase change material is investigated. The results show that: expanded graphite which can be dispersed evenly in the composite phase change material, the thermal stability is well, significantly improve the thermal conductivity of the composite phase change material.

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