PSI - Issue 13

Barbara Šubic et al. / Procedia Structural Integrity 13 (2018) 503–510 Subic et al. / Structur l Integrity Procedia 00 (2018) 000 – 000

508 6

Fig. 4. Isotherm flow through WB1 (a) and WB2 (b) double sashed window profile with different reinforcing materials in comparison to reference window profile

Fig. 4 shows the isotherm flow through WB1, WB2 and reference profiles, with marked (red colour) minimal temperature on the inner side of the window. External temperature was set at -5 °C and internal temperature at 20 °C. Bold black line represents 0 °C isotherm. With a comparison of the left and right pictures, we can see the negative effect of vertical reinforcement on thermal transmittance. This effect is most visible when aluminium reinforcements are used (WB2_AL). 3.2. Influence of window size on its Uw U w was calculated according to equation (1). In calculations, only U f of the mullion, width (B), and height (H) of window varied whereas all other parameters were constants. Comparison of U w values of double sashed window