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Norming and Calculation of Vapor Permeability of MultiLayer Building Enclosing Structures (Recommendations for Improving SP 50.13330.2012 "Thermal Protection of Buildings")
The article considers the actual problem of the heat and moisture state of multi-layer enclosing structures of buildings. Therefore, it is very important to design a multilayer structure in such a way as to prevent condensation and moisture accumulation in the structure during the cold season. The article presents an original method for calculating the characteristics of individuallayers of a multilayer structure, in which only the condensation plane is allowed, so the structure works at thelimit, but moisture accumulation does not occur, since the required (normalized) resistance to vapor permeation is determined from the condition that the amount of vapor that enters the condensation plane is equal to the amount of vapor that comes out of it. A simple and reliable method for determining the temperature in the plane of possible condensation is given, then the position of this plane in the structure and the required resistance to vapor permeability of the entire structure are determined. The solution of this problem is reduced to solving a system of twolinear equations consisting of the sum of the thermal resistances of the layers and the resistances of the vapor permeation of these layers, equal to the corresponding standard values of heat transfer and vapor permeability. Twolayers are distinguished in the multilayer structure, one of which determines the heat-shielding properties of the enclosure, and the other regulates the diffusion of vapor through the structure. Solving the system of two equations with two unknowns, we determine the corresponding characteristics of theselayers, which provide the required heat-shielding properties and do not allow the accumulation of condensation moisture in the structure during the cold period of the year. The advantage of this method consists in the fact thatlayers in a multilayer structure are selected not intuitively, but by calculation for compliance with regulatory requirements.
Norming and Calculation of Vapor Permeability of MultiLayer Building Enclosing Structures (Recommendations for Improving SP 50.13330.2012 "Thermal Protection of Buildings")
The article considers the actual problem of the heat and moisture state of multi-layer enclosing structures of buildings. Therefore, it is very important to design a multilayer structure in such a way as to prevent condensation and moisture accumulation in the structure during the cold season. The article presents an original method for calculating the characteristics of individuallayers of a multilayer structure, in which only the condensation plane is allowed, so the structure works at thelimit, but moisture accumulation does not occur, since the required (normalized) resistance to vapor permeation is determined from the condition that the amount of vapor that enters the condensation plane is equal to the amount of vapor that comes out of it. A simple and reliable method for determining the temperature in the plane of possible condensation is given, then the position of this plane in the structure and the required resistance to vapor permeability of the entire structure are determined. The solution of this problem is reduced to solving a system of twolinear equations consisting of the sum of the thermal resistances of the layers and the resistances of the vapor permeation of these layers, equal to the corresponding standard values of heat transfer and vapor permeability. Twolayers are distinguished in the multilayer structure, one of which determines the heat-shielding properties of the enclosure, and the other regulates the diffusion of vapor through the structure. Solving the system of two equations with two unknowns, we determine the corresponding characteristics of theselayers, which provide the required heat-shielding properties and do not allow the accumulation of condensation moisture in the structure during the cold period of the year. The advantage of this method consists in the fact thatlayers in a multilayer structure are selected not intuitively, but by calculation for compliance with regulatory requirements.
Norming and Calculation of Vapor Permeability of MultiLayer Building Enclosing Structures (Recommendations for Improving SP 50.13330.2012 "Thermal Protection of Buildings")
Anatoly G. Perekhozhentsev (author)
2018
Article (Journal)
Electronic Resource
Unknown
multi-layer protecting structures of buildings, determination of possible condensation plane, normalization of resistance to vapor permeability of enclosing structures, rationing of enclosing constructions, non-accumulation of moisture in the structure during the cold period of the year , Architecture , NA1-9428
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