Published since 1923
DOI: 10.33622/0869-7019
Russian Science Citation Index (RSCI) Web of Science
  • Thermal Resistance Of External Enclosing Structures At Variable Heat Flow
  • UDC 69.022.3:699.86:51-74:53.096
    doi: 10.33622/0869-7019.2022.10.04-13
    Vladimir T. EROFEEV1,
    Tatiana F. ELCHISHCHEVA2,
    Alexey P. LEVTSEV1,
    Elena A. MITINA1,
    Evgeniy S. LAPIN1,
    1 National Research Ogarev Mordovia State University, ul. Bolshevistkaya, 68, Saransk 430005, Russian Federation
    2 Tambov State Technical University, ul. Sovetskaya, 106/5, Tambov 392000, Russian Federation
    Abstract. Under operating conditions, the external enclosing structures of buildings are most of the time under the influence of variable heat flow caused by fluctuations in the temperature of the external environment and the coolant. At the same time, the thermal resistance of enclosing structures at low frequencies of heat flow fluctuations does not remain constant. Experimental and theoretical studies of the influence of thermo-physical parameters of three-layer monolithic enclosing structures on the change in thermal resistance under normal conditions and at high humidity are presented. The method of analogies with respect to electrical circuits was used for the study. When composing a system of differential equations, an energy circuit is applied that takes into account the active thermal resistances and thermal capacitances of each layer of the enclosing structure. The solution of the system of such equations was performed by the frequency method according to the developed algorithm. Graphical dependences of amplitude-frequency characteristics, representing an increment of the module of complex thermal resistance, are constructed for four variants of three-layer monolithic panels. It is established that at a low frequency changes in heat flow and temperature, the increment of the complex thermal resistance of the enclosing structure is from 1.42 to 5.68%, depending on its thermo-physical properties, while the humidity of the material can also influence on the thermal resistance.
    Keywords: external enclosing structures of buildings, heat flow, amplitude-frequency response, thermal resistance, analogy method, building material moisture content, frequency method
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  • For citation: Erofeev V. T., Elchishcheva T. F., Levtsev A. P., Mitina E. A., Lapin E. S. Thermal Resistance of External Enclosing Structures at Variable Heat Flow. Promyshlennoe i grazhdanskoe stroitel'stvo [Industrial and Civil Engineering], 2022, no. 10, p. 4-13. (In Russ.) doi: 10.33622/0869-7019.2022.10.04-13