Abstract
Heat loss analysis in cladding of brick buildings under reconstruction is presented. Thermograms obtained under thermovision inspection and window systems operating experience in conditions of the Republic of Bashkortostan are thoroughly studied. Live issue of increasing buildings energy performance in public utilities sector may largely be solved by replacement of existing window units made of wood to new PVC profile windows equipped with multi-glazed glass units both in brick and frame-panel old buildings. Significant heat loss occurs in junctions between the window frames and the wall in jamb areas. Therefore for the heat conduction matrix for the finite element is used the heat balance equation. Use of the software application to choose certain measures to eliminate the thermal bridges enables to get the thermotechnical calculations in the junction between the window and the exterior wall in the form of temperature fields. Practical recommendations for arrangement of heat insulation in junctions between the window frames and the wall to eliminate actual defects and for normal room conditions are made under examinations. To get the heat conduction matrix for the finite element we will use the heat balance equation.
Highlights
The majority of residential buildings using wooden windows was built in the 20th century in the Soviet Union
Inconsistency of residential buildings, designed by SNiP 23-02-2003 before updating, with present standards by the reduced resistance values of external walls and by specific heat performance [3, 4] found by some scientists under analysis of cladding structural solutions is absolutely explained by this fact
Various software applications [5, 6] are currently applied for calculation of 2D and 3D temperature fields when defining the reduced heat-transfer resistance values of external walls
Summary
The majority of residential buildings using wooden windows was built in the 20th century in the Soviet Union. Window constructions using PVC profile were being developed for the last 15 years due to strengthening of requirements to buildings heat protection and new technologies for making windows, with two-casement glass windows being replaced by single-casement equipped with glass units [1]. New domestic standards, regulating thermotechnical parameters for enclosing structures, that were applied in engineering and construction of new and reconstruction and renovation of available housing and public facilities were consistently toughening the requirements to thermal resistance all over the enclosing structures of buildings (walls, coating, windows, etc.)
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