Thermal comfort and energy saving of novel heat-storage coatings with microencapsulated PCM and their application
Novel heat-storage composite coatings containing microencapsulated phase change material (MPCM) are prepared to enhance the thermal energy storage of the inner walls of an indoor environment. MPCMs with n-octadecane as core and polyurea as shell are synthesized via interface polymerization. They, along with the coatings, are characterized using Fourier transform infrared spectra (FTIR), SEM, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The SEM results show that MPCM can maintain its original morphology and be dispersed uniformly in the coatings with 30 wt% MPCM loads. Moreover, the latent heat capacity of MPCM and the heat-storage coatings are 151.89 J/g and 45.5 J/g, respectively. Other properties, such as thermal stability, temperature time lag, and film-forming are also tested, and the test results indicate excellent performances. After 200 heating-cooling cycles, MPCM and the heat-storage coatings still exhibit good thermal stability. Two reduced-scale test chambers enveloped by wall boards painted with and without MPCM coatings are tested under the same conditions and compared. Overall, the chamber with MPCM coatings can keep a stable temperature of 26-28 °C for approximately 77 min when the heating load is 80 W/m 2 . However, the chamber without PCM coating can only maintain such temperature for 13 min. Thus, the heat-storage coatings can improve the thermal comfort of indoor environments and have a high potential application in building thermal energy storage, especially for old buildings retrofit.
危险品化学品经营许可证（带存储）