ISO 9164 heat loss in roof-wall sections

摘要

In the simple ISO9164 calculation procedure for transmission heat loss coefficient, HT, it is unclear, and undefined for floor or roof-wall sections, how the parameters in the equations will be calculated. In this paper, a method is proposed for the calculation of ISO9164 parameters for roof-wall sections. The results obtained by the proposed method for typical roof sections are compared with those obtained by the EN832/EN13789/ENISO14683 methods and with the L2Dvalues from 2D analysis. A comparison of the floor and roof behaviour is realized using the results of the present and the previous works of the authors. The HTvalues obtained by the proposed model using the sum of qythrough the beam are harmonised with the L2Dfor floors, which are significantly different from the L2Dfor roofs with parapet. The results indicate that the L2Dvalues cited in EN10211-1 are sensitive to the 2D heat flows for floor sections. However, the L2Dis not sufficiently sensitive to heat flow from the beam to the parapet and the interactions between the zones within the beam section, whereas the proposed method is more sensitive to the 2D heat flows.