Experimental determination of the heat transfer coefficient by a simplified method for the stationary heat exchange mode in the air cleaner
DOI:
https://doi.org/10.46299/j.isjea.20240305.03Keywords:
air cleaner, recuperative heat exchanger, recirculating air cleaner, heat exchange, heat transfer coefficientAbstract
The research is aimed at the development of an air cleaner with an additional air heating function. The study examines the heat exchange processes in the air-to-air heat exchanger of the outdoor air heating in the recirculation section of the air cleaning unit equipped with HEPA 11 filter inserts. The calculations are valid for recirculation type air cleaning units with cleaning performance in the recirculation part in the amount of 300 to 1000 m3/hour. The amount of air cleaned in the recirculation section of the air purifier allows you to heat a certain volume of air from the street, while the expected temperature of the air recirculating in the room will decrease by only two degrees, from the initial temperature of 20C to 18C. The regression equation describing the forecasting of the temperature of the cold heat carrier at the exit from the heat exchanger and the heat transfer coefficient of the heat exchanger was determined by the method of conducting a full factorial experiment. The adequacy of the regression equation was confirmed by statistical analysis. The effective volumetric flow rate of the cold heat carrier at the average real speed in the tubes along which the cold heat carrier moves and the temperature difference of the cold heat carrier at the entrance to the heat exchanger and at the exit from it are determined. Based on these values, the heat flow perceived by the cold coolant from the hot coolant is determined. The heat transfer coefficient was determined experimentally by a simplified method for the stationary mode of heat exchange. The study data confirmed the feasibility of using an air-to-air heat exchanger for heating the outside air in the recirculation section of the air cleaning unit (air cleaner) for heating the outside air without using additional energy. The air cleaner has a periodic nature of operation and is used as needed.References
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