Energy consumption of hollow bucket walls filled with different insulation materials

In both chinese villages and towns buildings, the use of Hollow bucket walls are widely observed, but the effectiveness of filling them with insulation material has not been clarified. In this study, the effects of different insulation materials on the energy consumption of hollow bucket walls have been analyzed. The heat flowmeter method has been used to measure the heat transfer coefficients of the walls, which has been compared with theoretically calculated values. Meanwhile, the building Energy Consumption of different insulation enclosures was numerically modeled. The results showed that the heat transfer coefficient of the Dahlen brick cavity wall without infill material was the largest at 1.86 W/(m2·K). The number of heat transfers in the silt terra cotta air hopper wall in the enclosure with infill material was 0.89 W/(m2·K). The heat transfer coefficient of the expanded perlite cavity wall was 0.88 W/(m2·K). The heat transfer coefficient of the rice husk air hopper wall was 0.8 W/(m2·K). It can be seen that the walls of rice husks have the lowest heat transfer coefficient and the best thermal insulation. The measured heat transfer coefficients of the air hopper walls are greater than the theoretically calculated heat transfer coefficients by comparative analysis. The average bias error is only 3 %. In addition, numerical simulations of the envelope with different insulation materials showed that the internal surface temperature of the rice husk-filled wall was 21.89 ℃ among the walls tested. The internal surface conduction heat transfer rate was 58.53 W. The total heat loss energy for regional infiltration was 1.056 MJ. All three values are the lowest. However, the total heat gain energy for regional infiltration is up to 0.231 MJ, which confirms the experimental results. These results can be used to develop design specifications for hollow hopper walls with good insulation properties and demonstrate how waste materials such as rice husks and straws can be reused in rural areas.