THEORETICAL AND EXPERIMENTAL INVESTIGATIONS ON APPLICATIONS OF THERMAL INSULATION COATINGS IN BUILDING AIR-CONDITIONING ENERGY CONSERVATION
Theoretical and experimental investigations on a kind of thermal insulation coatings (TICs) and its application in decreasing building cooling load were done, including the following contents.1) A kind of ceramic micro-sphere (CMS) incorporated TICs were analyzed with scanning electron microscope (SEM). Based on the results of the analysis, the numerical element method was used to establish a numerical model to predict the effective thermal conductivities（ETCs）of this kind of coatings. The influence of the thickness and ETC of the walls of the CMS and the volume percentage of the CMS filled in the coating to the ETC of the coatings were discussed.2) A steady-state model was constructed to study the influence of the TICs parameters on the building cooling load, including the thermal conductivity, solar absorptivity, emissivity.3) Moreover, a transient model was constructed to simulate the thermal behavior of a room with coated roof and south wall. Using this model with the summer month-average meteorologic data of Hefei, the air-conditioning dynamic load of a standard room was simulated, and the effect of TICs on local building energy conservation was evaluated.The following results were achieved:1) TICs of good performance could be fabricated by using CMSs of thin wall; the ETC of the CMS wall has an important influence on the ETC of the TIC, the former must be very low, for example, less than 0.05W/(m·K), to decrease the latter effectively; increasing the filling ratio could decrease the ETC of the TICs significantly; the ETC of the TICs could be reduced by filling the CMS, but the extent of the reduction is limited.2) Only when the ratio of the thermal resistance of TICs to that of the wall is larger than 0.2, the thermal conductivity of TICs could have a strong influence on the cooling load; the surface solar absorptivity and emissivity of TICs are the dominant factors influencing the cooling load.3) By coating the outer surfaces of building with TICs, the cooling load and diurnal cooling consumption could be decreased remarkably; For example, in August of Hefei, using TICs could make the peak value in daytime of air-conditioning dynamic load decrease 26.3％ and the lowest value in night decrease 50.6％, and the whole summer’s average air-conditioning diurnal cooling consumption could be reduced 40.0％.
Thermal insulation coatings Thermophysical properties Cooling load
Bin XU Hong YE
Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230026, China
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）