Synthesis and characteristics of hygroscopic phase change material: Composite microencapsulated phase change material (MPCM) and diatomite

Abstract This paper prepared a new kind of hygroscopic phase change material using MPCM and diatomite. The composite can absorb/release not only thermal heat, but also moisture. The shell material of MPCM was prepared with methyl triethoxysilane (MTES) by sol–gel method, and a kind of alkane mixture was used as the core material. The diatomite was used as hygroscopic material. The morphology of the microcapsules and the diatomite were measured by the scanning electron microscopy (SEM). The thermal properties of MPCM and the composite MPCM/diatomite materials (CMPCM) were analyzed with differential scanning calorimetry (DSC). The thermal gravimetric analysis (TGA) was used to study the thermal stability of MPCM and CMPCM. The moisture transfer coefficient and moisture buffer value (MBV) of the diatomite and CMPCM were measured. The DSC results showed that the microcapsules were encapsulated in the SiO2 shell. The TGA results showed that the microcapsules and CMPCM have a good thermal stability. The measurements of the moisture transfer coefficient and moisture buffer value (MBV) of CMPCM, diatomite, gypsum board and wood showed that CMPCM has a better hygroscopic performance. The hygroscopic phase change material can moderate both the indoor temperature and moisture.

[1]  Changying Zhao,et al.  Review on microencapsulated phase change materials (MEPCMs): Fabrication, characterization and applications , 2011 .

[2]  Steve King,et al.  Asthma, House Dust Mites and Indoor Climate , 1997 .

[3]  C. Rode,et al.  The Concept of Moisture Buffer Value of Building Materials and its Application in Building Design , 2006 .

[4]  Lei Cao,et al.  Synthesis and characterization of microencapsulated paraffin with titanium dioxide shell as shape-stabilized thermal energy storage materials in buildings , 2014 .

[5]  P. Fanger,et al.  Upper limits of air humidity for preventing warm respiratory discomfort , 1998 .

[6]  Ola Wedebrunn,et al.  Climate and architecture , 2010 .

[7]  G. Fang,et al.  Synthesis and properties of microencapsulated paraffin composites with SiO2 shell as thermal energy storage materials , 2010 .

[8]  Xiaodong Wang,et al.  Development of bifunctional microencapsulated phase change materials with crystalline titanium dioxide shell for latent-heat storage and photocatalytic effectiveness , 2015 .

[9]  F. Bruno,et al.  Review on storage materials and thermal performance enhancement techniques for high temperature phase change thermal storage systems , 2012 .

[10]  Lei Cao,et al.  Preparation and characteristics of microencapsulated stearic acid as composite thermal energy storage material in buildings , 2013 .

[11]  G. Fang,et al.  Synthesis and Characterization of Microencapsulated Paraffin Microcapsules as Shape-Stabilized Thermal Energy Storage Materials , 2013 .

[12]  Jens Korsgaard,et al.  Asthma and the indoor environment: Assessment of the health implications of high indoor air humidity , 1986 .

[13]  T. Beatley.  Green Urbanism: Learning From European Cities , 1999 .

[14]  Arild Gustavsen,et al.  Phase Change Materials for Building Applications: A State-of-the-Art Review , 2010 .

[15]  Povl Ole Fanger,et al.  Temperature and humidity: important factors for perception of air quality and for ventilation requirements , 2000 .

[16]  Menghao Qin,et al.  Combined heat, air moisture and pollutant simulations (CHAMPS) for buildings , 2011 .

[17]  S. M. Sadrameli,et al.  A review of microencapsulation methods of phase change materials (PCMs) as a thermal energy storage (TES) medium , 2014 .

[18]  Zhiqiang Zhai,et al.  Modeling phase change materials embedded in building enclosure: A review , 2013 .

[19]  G. Fang,et al.  Preparation and characteristics of microencapsulated palmitic acid with TiO2 shell as shape-stabilized thermal energy storage materials , 2014 .

[20]  Guiyin Fang,et al.  Preparation and heat transfer characteristics of microencapsulated phase change material slurry: A review , 2011 .

[21]  P. Fanger,et al.  Upper limits for indoor air humidity to avoid uncomfortably humid skin , 1998 .

[22]  Menghao Qin,et al.  Preparation and characteristics of composite phase change material (CPCM) with SiO2 and diatomite as endothermal-hydroscopic material , 2015 .

[23]  Menghao Qin,et al.  Simulation of whole building coupled hygrothermal-airflow transfer in different climates , 2011 .

[24]  Sassi Ben Nasrallah,et al.  Thermal properties of smart microencapsulated paraffin/plaster composites for the thermal regulation of buildings , 2015 .

[25]  Xiaodong Wang,et al.  New approach for sol–gel synthesis of microencapsulated n-octadecane phase change material with silica wall using sodium silicate precursor , 2014 .