A method of calculating the minimal thermal insulation layer in the exterior wall construction
Received 04.06.2021, Revised 07.10.2021, Accepted 19.11.2021, Published 17.12.2021
Abstract
Development of minimal thermal insulation layer calculating method to ensure compliance with the regulatory requirements for the reduced heat transfer resistance of the building envelope and its practical implementation. To achieve this goal, analytical calculations of the reduced heat transfer resistance and the thermal insulation layer in the exterior wall were used. Calculations of the reduced heat transfer resistance considered the thermal effects of heat bridges, which are characteristic features of the exterior wall, as well as heat bridges, which are determined by the design features of the whole building. A methodical approach for calculating the minimal thermal insulation layer, which ensures compliance with regulatory requirements for the reduced heat transfer resistance of the building envelope is substantiated. The proposed method simplifies the minimal thermal insulation layer calculation, which ensure compliance with regulatory requirements for the reduced heat transfer resistance of the exterior wall at the stage of making primary decisions on its construction. This will allow one-step calculation without a multi-variant search for the required solution. Since the thermal insulation layer in the exterior wall is directly related to transmission heat loss through the building thermal insulation envelope, its determination in one go by this method simplifies further calculations of the building energy performance. Provided that the minimum requirements for the building energy performance are met, according to the results of these calculations, and a reduction factor is applied to the minimum allowable reduced heat transfer resistance according to the standards, the thermal insulation layer thickness can be optimized and reduced. The paper substantiates and gives examples of the method of calculating the minimal thermal insulation layer practical implementation, which is suitable for use at the first stage of designing the exterior walls with compliance to the regulatory requirements for the reduced heat transfer resistance of the building envelope. The method is based on the proposed analytic dependence to determine the thickness of thermal insulation layer in the exterior wall.
Keywords:
heat transfer resistance; reduced heat transfer resistance; linear heat transfer coefficient; point heat transfer coefficient; thermal insulation layer; exterior wall
