Thermal Properties of Hemp Shives Used as Insulation Material in Construction Industry

The article presents the results of studies concerning raw hemp shives obtained from the Polish crop of industrial hemp as a loose-fill thermal insulation material. The study focuses mainly on the measurements of the pore size distribution, thermal conductivity and air permeability of material. An increase in the value of the thermal conductivity coefficient (0.049-0.052 W/(m center dot K)) was demonstrated with an increase in the bulk density. The porosity of the individual pieces of shives is 78.7% and the predominant number of pores is in the diameter range of 0.9-3 mu m. The paper also presents an example of the use of the tested material as thermal insulation of the wooden frame wall. The heat flow analysis was performed in various wall variants (insulation thickness: 100, 200 and 300 mm and pressure difference 0, 5, 10 and 15 Pa). A clear influence of the variables on the temperature distribution was observed.

Automated summary

The article presents a study on the thermal insulation properties of raw hemp shives obtained from the Polish crop of industrial hemp. The focus of the study is on pore size distribution, thermal conductivity, and air permeability. The results show that the thermal conductivity coefficient increases with the increase in bulk density. The shives have a high porosity, with the majority of pores in the diameter range of 0.9-3 μm. The article also provides an example of using the tested material as thermal insulation for wooden frame walls and observes the clear influence of variables on temperature distribution through heat flow analysis.