ZEMCH 2015 - International Conference Proceedings | Page 719

Thermal characteristics of the peripheral wall with windows were determined (CSN 730540-2 2011;
EN ISO 6946 2007) and shown in the following:
• thermal resistance of the wall R [m2KW-1]
• total thermal resistance Rt = Rsi + R + Rse [m2KW-1] , where internal (resp. external) surface
resistance Rsi = 0.13 m2KW-1 (resp.Rse = 0.04 m2KW-1
• overall heat loss coefficient of the wall U = 1/ Rt [Wm-2K-1]
• overall heat loss coefficient of the window Uw [Wm-2K-1]
Wall and windows before the renovation:

R = 0.57 m2KW-1, Rt = 0.742 m2KW-1, U = 1.348 Wm-2K-1, Uw = 3.0 Wm-2K-1
Wall and windows after the renovation:

R = 2.30 m2KW-1, Rt = 2,475 m2KW-1, U = 0.404 Wm-2K-1, Uw = 1.4 Wm-2K-1
The thermal insulation of the peripheral wall and better thermal insulation quality of the window
with low emissivity double glass unit had an influence on increased internal surface temperature
which is positive for reduction of the surface condensation risk. Two dimensional (2D) distribution
of temperature of the wall details in the corner and at the window jambs before and after the
renovation are presented in the following diagram (Fig.3).

Figure 3: 2D temperature distribution of the external wall details in the corner and at the window
jambs in the state before and after the renovation; I- internal plaster, Ia – polystyrene layer 80 mm, II –
brick masonry wall, III – external plaster

Analysis of therm