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Energy efficiency assessment of heat insulation building products: fuzzy-probabilistic approach

Biks Yuriy, Lyalyuk Olena, Ratushnyak Georgiy, Ratushnyak Olga, Lyalyuk Andriy

Architecture Civil Engineering Environment

2021

Vol. 14, no. 1

59--68

The expediency of using heat-insulating construction products from a straw at the erecting of energy-efficient envelope constructions is considered in the paper. The hierarchical model in the form of an inference tree of the factors influencing the target function - reliability of energy efficiency of heat-insulating building products made of straw has resulted. A fuzzy matrix of knowledge is proposed which reflects the influence of thermophysical, physic-mechanical and durability parameters on the target function. The hierarchical connections between classified factors proceeded by apparatus of fuzzy logic and linguistic variables. A system of fuzzy logical equations which describes linguistic expressions of input variables according to the corresponding terms is proposed. In the research the expressions which describe the objective function - reliability of energy efficiency of heat-insulating construction products made of straw were obtained. It was made with the of membership functions following linguistic variables, by taking into account both qualitative as well as quantitative factors of influence. Represented in the paper model can be used as the design and engineering tool for the prediction of thermal performance of any multilayered wall assembly at the design stage of the project to assess complex energy efficiency parameters, which could be applied in practice during the decision-making process.

Energy performance assessment of envelopes from organic materials

Biks Yuriy, Ratushnyak Georgiy, Ratushnyak Olga

Architecture Civil Engineering Environment

2019

Vol. 12, no. 3

55--67

The paper estimates the thermal perfomance of effective building envelopes from organic materials for the construction of low-rise buildings. The popular types of walls made of natural energy-efficient materials with low carbon footprint are considered in numerical assessment: hempcrete, adobe, strawbale panel, earthbag and cordwood. The influence of the constructive layer type of the envelope on the amount of thermal inertia time is analyzed. It is revealed that the hempcrete wall has the biggest thermal inertia time, the wall of the earthbags has almost ten times smaller. The walls made of adobe and strawbale panels have practically equal time of thermal inertia. For more objective analysis, by taking into account the variety of physical and physical-mechanical parameters of the envelopes’ material, the concept of integral criterion of the envelope energy efficiency potential is proposed. The estimation of the integral criterion of energy efficiency potential is calculated by the Analytic Hierarchy Process and the proposed method is fulfilled. Comparison of the integral criterion of energy efficiency potential for different wall types which was made by menas of two abovementioned methods has shown the same order of magnitude.