Abstract
This paper presents thermal response study of lightweight extensive green roofs with lightweight mineral wool growing media in winter period. Green roof heat and mass transfer model was developed based on short- and long-wave radiation heat exchange, surface convection and vegetation evapotranspiration. The model also considers latent heat accumulation in lightweight mineral wool growing media using effective heat capacity method. Experimental results as well as results of numerical simulations proved that in the winter heat loses of green roofs are smaller compared to the reference roof construction of the same composition and the same U-value. Heat stored in the green roof growing media in the form of latent heat, by water freezing or melting, additionally reduces the daily peak heat flux as well as daily heat losses. For continental climate conditions the effect of latent heat accumulation is larger in colder days and during night time conditions resulting in significant decrease of building peak heat demand.
Published Version
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