Dovbnenko O. Substantiation of operating modes of heat exchangers of ventilation emissions from livestock buildings

The thesis deals with improving the effectiveness of a recuperative heat exchanger of ventilation emissions from livestock buildings through the development of a method to protect the heat transfer surface from frosting. Given is a mathematical model for the process of heat recovery of ventilation emissions, which describes the relationship between parameters of the heat exchanger and air temperature and humidity in a building and environment. The model allows determining operating modes of heat exchangers of ventilation emissions and studying the effectiveness of heat recovery with due regard for real conditions of their operation. Developed is a method to protect the heat transfer surface from frosting with the use of preheating of incoming air in an additional heat exchanger. Substantiated is workability of recuperative heat exchangers of ventilation emissions from livestock buildings under the lowest observed air temperatures of environment, which are specific for climatic conditions of Ukraine. Experimental studies were carried out referred to parameters of heat exchangers made from polymeric materials, and its results confirm the energy effectiveness of the developed method for protection of the heat transfer surface from frosting. The recuperative counterflow and cross-flow heat exchangers were put into practice. Technical and economic values of benefits of their application were calculated.