Dendrocalamus asper for bamboo plastered wall and ITS effect on building thermal performance

WIJAYANTI, Mieke, Prof. Ir. Iman Satyarno, M.E.,Ph.D

2010 | Tesis |

The continuous need to provide low cost housing for the low-income group has led to considerations in the development of housing types which are sustainable. Currently, the low-cost houses in Indonesia failed to provide satisfactory housing condition to the occupants, especially in terms of thermal comfort. The problem of thermal comfort has been worse, due to inappropriatem selection of building materials. This study investigates the possibility of bamboo based panel as thermal insulation in low-cost wall construction that expected to be a potential material that would be more sustainable and able to maintain indoor thermal comfort for longer period. Dendrocalamus asper was chosen for this study because it is the most suitable species as concrete reinforcement due to its low shrinkage. This study focuses on the effect of the bamboo plastered wall on building thermal performance, generated mainly by conduction and convection heat transfer process. The detailed objective of this study were to find the value of thermal properties of D.asper and mortar mixture with a ratio of 1 PC : 4 sand proportion, to find the value of convective heat transfer coefficient of wall surface, to calculate thermal resistance of bamboo plastered wall, to analyze the thermal resistance of various wall material, and to compare indoor temperature that produced from the application of different the wall materials. Those objectives were pursued by conducting a set of laboratory experiment and by developing a convective heat transfer coefficient measurement tool. The thermal analysis simulations were then performed with the software ECOTECT v560. The result shows that D.asper as wall material can be classified as insulator due to the low thermal conductivity (λ = 0.145W/mK) and also lightweight due the density and specific gravity test result (ρ = 636.4 kg/m3 ; SG = 0.6364 at moisture content 18 %). The convection study on mortar and bamboo shows that bamboo material effectively reduces the surface temperature when the convection process is occurred. The convective coefficient of bamboo surface is two times higher than the mortar surface. Variation of the thickness of bamboo and mortar in a bamboo-mortar composite wall shows that the thicker the bamboo will generate higher thermal resistance. The U-value calculation of several materials under the same condition shows that bamboo plastered wall has the lowest U-value. The materials compared with bamboo plastered are materials that commonly used as wall material like red clay brick plastered and concrete block plastered. The simulation on those different wall materials shows that the wall made of bamboo plastered produced a remarkable decrease in the indoor temperature.

Kata Kunci : Bamboo plastered,Thermal conductivity,Connective coefficient,Thermal performance