The study covers a complex of problems related to systems analysis, modeling, research, and development of effi cient power systems to ensure building microclimate with insulated windows of increased tightness. Only insulated windows with a plastic frame (PVC windows) are considered. Some researchers provide an analysis of the results of building energy-saving potential of the microclimate control systems. The study includes modeling and research of ventilation modes and thermal control in a building with PVC windows of increased tightness using a self-designed mathematical apparatus and soft ware. It is shown that the real cost of thermal energy provided by the installation of PVC windows is reduced due to the latent heat loss associated with the growth of the ventilation load to ensure a comfortable microclimate. The research off ers a way and conditions of the fullest realization of technical and economic benefi ts off ered by PVC windows.
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