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Information × Registration Number 0212U007318, 0111U009281 , R & D reports Title Heat and mass transfer simulation in recuperative heat exchangers in ventilation systems popup.stage_title Head Deshko V. I., Registration Date 27-11-2012 Organization National Technscal University of Ukraine "Kiev Polytechnic Institute". popup.description2 Issues of heat and mass transfer processes mathematical modeling in a cross flow membrane recuperative heat exchanger in ventilation systems in winter period are considered accounting "dry" zone and zone of condensation and frost formation. Local heat and mass transfer coefficients were used, which allows more accurate calculation of air temperature distribution on surface for cross flow, and area of condensation and frost formation. Mass transfer processes are calculated using the analogy between heat and mass transfer. The simulation results were presented in the form of heat and mass transfer coefficients, air temperature, air moisture content, heat flux and water vapor mass flow distribution on the heat transfer surface. Dependences of heat exchanger performances on air flow and heat and mass transfer coefficients were investigated. Using the dependences of freezing critical conditions for heat exchanger on room air relative humidity and outside air temperature the decisions on maximum limiting outdoor temperature establishment for the heat exchanger defrost strategy can be made. Also the temperature efficiency coefficient corrections for condensation and freezing depending on room air relative humidity at different outside air temperatures were identified. Due to mass transfer between the air flows through the membrane, condensation zone for the total heat exchanger is less than for the sensible one. The resulting mathematical model allows the calculation of heat and mass transfer in cross flow recuperative heat exchangers of any size and configuration. Results can be presented in the form of outgoing temperatures, moisture content, heat flux and water vapor mass flow as well as the distribution of these parameters on heat exchanger surface, condensation and frost formation zone. Potential users: manufacturers, designers and users of ventilation systems with heat recovery. Product Description popup.authors Дешко Валерій Іванович Суходуб Ірина Олегівна popup.nrat_date 2020-04-02 Close