Abstract
Unlike buildings, the heat demand of greenhouses is affected also by the evaporation of the respective crop. Due to condensation of water vapour inside the covering material, latent heat is converted into sensible heat and transported outwards through the covering material. The portion of latent heat can increase to more than 50 % of the internal heat transfer and is therefore a significant heat flux, which must be considered in calculations of heat demand. The heat transfer coefficients (U-values), as they are given in literature, are only valid for dry conditions without condensation. In this work, a simplified methodological approach was chosen using heat transfer resistances to consider the latent heat flux and thus, to calculate U-values for greenhouse conditions including condensation.
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