The usage of heat insulating material from flax noils in low-rise residential buildings

Abstract

Based on complex experiments, an assessment was made of the use of flax noils as a fibrous structure-forming material for thermal insulation boards. he article presents information on the selection and ratio of thermal insulation components based on flax noils. The indices of sorption humidity at a relative air humidity of 40–97 % and the vapor permeability coefficients of insulation materials made of noils are determined. The issues of resistance of thermal insulation materials to fungus are considered. The results of full-scale tests of a wall enclosure with a ventilated insulation system, an external wall with a wooden frame system and an attic floor structure of residential buildings in operation, including insulationmaterials based on flax noils and fibres as thermal insulation, are presented. Based on the obtained data, the values of thermal transfer resistance of the enclosing structures under study are calculated. Based on the test results, it was determined that the wall enclosing structures containing flax noils thermal insulation boards provide a heat transfer resistance of 3,24−4,55 (m2∙°C)/W at an air temperature of –22 °C and –23 °C. At an air temperature of –17 °C, the thermal resistance of the attic floor with insulation based on flax noils is 6,27 (m2∙°C)/W. It was found that the heat transfer resistances of the experimental enclosing structures with flax noil thermal insulation materials exceed the indicators of the walls and attic floor structure, including flax fiber thermal insulation, by11−16 %. Based on the tests conducted, the effectiveness of thermal insulation boards made from noils was confirmed in comparison with insulation materials based on various plant materials, including flax fibres. As a result of the research, the rational use of flax noils as a structure-forming component of thermal insulation for low-rise residential buildings was substantiated.