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Green construction is one of the most promising directions for development not only in the construction complex, but also in the social environment. Green buildings, as human environment, are attractive for investors, designers, utility equipment manufacturers and housing owners. Requirements for green buildings are sufficiently high and cannot be met by the traditional design principles based mainly on typical solutions. As a result we need to arm designers, builders and operators with new creative knowledge. In essence certification of a facility as a green building initiates a creative search for architects and engineers of such technical solutions that minimize negative and optimize positive influence of energy, environmental and technological factors that define the building as human environment. In this work it is difficult to separate the creativity of architect and engineer: we have to consider their joint work during the entire design process and only such union can bring success in achievement of the set goal.

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Abstract. This article is dedicated to the study of the processes of formation and freezing of condensate in heat exchangers using ambientair heat and is prepared according to the results of experimental investigations. The aim of this work has been set to elaboratean energy-independent technical solution for protection of heat-exchange equipment against freezing the moisture condensed on the heat-exchange surfaces while using the low-potential heat of ambient air in heat pump systems. The investigations have shown that at the temperatures of ambient air close to 0°C when using the «traditional» way of defrostation, which means the reverse mode of operation of heat pump, an intensive formation of ice is observed at the bottom part of evaporator (if not provided with tray heater). This effect is provoked by downward flow of thawed waterand it'sfreezing in the lower part of the heat-exchanger due to the fact that the tray and housing of heat pump have a temperature below zero. Thereafter, while the defrostation mode has been periodically used, the ice coat would begoing to continue its growth,and by time significant area of evaporator could appear to be covered with ice.The results of the investigations presented in the article could be applied both to air-source heat pumps and to ventilation air heat recuperators