Developing an effective deflector for duct natural ventilation

Abstract

Information is given on increasing the available gravitational pressure of natural duct ventilation by increasing the use of wind flow energy. The scheme and operation of the developed deflector with a vertical finned cylindrical surface based on the CAI deflector are described. The laboratory bench scheme developed and patented for evaluating the efficiency of various types of deflectors is presented. Thermo-anemometer was used in experimental studies as instrumentation TKA-PKM (52), as well as a wing type anemometer. The effectiveness of the developed deflector was evaluated using the mathematical method of planning and processing of experiments. Scientific and experimental investigations were carried out on the basis of an orthogonal composite plan of the first order. A complete factorial experiment was carried out in CFE 23. A regression equation adequately describes the influence of the design and process parameters on the air velocity in the natural ventilation duct at the significance level = 0.05. Experimental studies have confirmed that it is possible to increase the degree of utilization of wind stream energy when it flows over a vertical finned cylindrical surface in comparison with a smooth cylindrical surface. It is shown that air velocity in exhaust duct can be increased up to values of 3.35 m/s. α