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DETERMINATION OF INITIAL DATA FOR DESIGNING A DEVICE TO REMOVE CONDENSATE FROM THE RECUPERATOR OF VENTILATION EQUIPMENT

The technique is developed and equations are obtained for determining the volume of condensate formed in the exhaust air when it passes through the recuperator. The necessity of providing a ventila-tion unit with a device for capturing and removing condensate, which eliminates the formation of ice in the exhaust duct after the heat exchanger and, accordingly, reduces the cost of electricity for driving the exhaust fan is justified. Thermodynamic processes occurring in the humid removed air during its passage through the recuperator are investigated. For designing a device for capturing and removing condensate, dependences are obtained that make it possible to determine the consumption of condensate depending on the supply, temperature and relative humidity of the exhaust air, as well as the degree of its cooling at the outlet of the heat exchanger. To automate the calculations, an approximation of the known data is made and a polynomial is obtained to determine the dependence of the absolute humidity on the saturation line on the air temperature. The polynomial is made for the maximum temperature range of the heat exchanger. As an example, the operation of a ventilation unit equipped with a heat exchanger is considered in the workshop of an industrial enterprise with work category IIb during the cold period of the year with the supply of exhaust air of 45 103 m3 / h. To analyze the dependence of the volume of condensate on the parameters of exhaust air at the inlet and outlet of the heat exchanger, a series of calculations are performed using the Mathcad software package based on the developed methodology. A schematic diagram of a ventilation unit with a heat exchanger, equipped with a condensate removal device is developed. To exclude the formation of ice inside the recuperator, the air flow in it must be downward.