Thermal Efficiency of Concrete Ventilation Blocks for Building

Abstract

Thailand has a tropical and humid climate throughout the year. The building walls in various directions are the building frame that receives heat from solar radiation. Installing ventilation blocks as the building envelope helps prevent heat from entering the building and helps reduce the system's energy use. Air conditioning inside the building This study selected 5 ventilation block designs with open space to ventilation block size (Opening to block ratio - OBR) ranging from 0 to 46.81% to test the thermal protection efficiency of ventilation blocks The results of the study in selecting 50 ventilation block sample models found that 92% of the ventilation block samples that were selected had a solid area greater than the opening area, resulting in an OBR value in the range of 0 to 47.65 % and the number 7% had a solid area less than the area of ​​the opening with an OBR value of 51.13 to 57.36% and another 1% had a solid area equal to the area of ​​the opening with an OBR value of 50.15% and tested for thermal efficiency of ventilation block concrete. There were 5 forms of ventilation blocks with an OBR of 46.81 %, 27.39 %, 26.59 %, 22.11 %, and 0 % respectively. It was found that the test box installed with a ventilation block with a lower OBR pattern would prevent heat generated inside. The box tested better than the ventilation block with a higher OBR pattern and when comparing ventilation efficiency in terms of heat block with different types of materials, it was found that the surface temperature of the black-painted concrete block had the highest surface temperature. Followed by unpainted concrete blocks, and white-painted concrete blocks. Terracotta concrete blocks, respectively, and the wall that installed the ventilation block with an OBR value of 46.81% is the second wall. It will have a higher heating temperature than the wall installed with a ventilation block with an OBR of 22.11% because the sun's light can shine through the opening of the ventilation block with an OBR of 46.81% into the building more than the ventilation block with an OBR of 22.11 %