Internal wall between a typical room and e.g. a living room. staircase – thermal bridges.

Another analyzed thermal bridge is the internal wall between a typical room and e.g. a living room. a staircase with a temperature of. 10st.C.
Two different internal environments were introduced.
attention: The task concerns a heated staircase (with its own heat source)‏
attention: Perhaps the staircase should be adjusted (elevated) heat transfer coefficient. It depends on the movement of air, which should be determined on site or according to design data.

Linear bridge for an apartment. To define it, U0k is needed - the heat transfer coefficient for the wall between the staircase and the apartment.
U0k = 1 /(2*1/8,1 + 2*0,015/0,85 + 0,25/0,8) = 1,681 W / m2K
Ulm = (32,2102 – 0,5*0,5208*40 – 1,0 * 1,681 * 10)/40 = 0,125 W / mK - in the corner of the apartment adjacent to the staircase (strata) in relation to the external environment.