Lightweight green roofsʼ thermal response under freezing conditions [Elektronski vir]
Arkar, Ciril ...
This paper presents thermal response study of lightweight extens ive 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 prove d that in the winter heat loses of green roofs are smaller compar ed to the reference roof constr uction of the same composition an d the same U-value. Heat stored in the green roof growing media in the form of latent heat, by water freezing or melting, additio nally reduces the daily peak heat flux as well as daily heat losses. For continental climate conditions the effect of latent heat acc umulation is larger in colder days and during night time conditions resulting in significant decrease of building peak heat demand.
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