SWIRL DIFFUSER DESIGN FOR AIR FLOW IN AIR CONDITIONING OF AN AUTOMOBILE

Abstract

Swirl diffusers used in air-conditioning system for automobiles can create better air mixing to enhance inside
air quality and help in achieving better human comfort. The variation in temperature in air conditioning system depends
strongly on the flow characteristics produced by the diffuser outlet that vary considerably between different modelling set
ups. In automobile sector it is very important to calculate the effect of variation in temperature of diffused air through swirl
diffuser from a.c. with and without heat load In this dissertation work, I have tried to reduce the variation in temperature of
conditioned air and improvement in thermal human comfort by adopting different models of car swirl diffuser designed on
pro-E software. After that I have made prototype wooden model of the car swirl diffuser to check its performance under
different operating and flow conditions experimentally. The experiment has been performed inside an Alto 800 car with swirl
diffuser model installed at the car a.c. outlet. The variation in temperature of diffused air form car swirl diffuser at different
altitude and along longitudinal axis of car with the effect of heat load on temperature variation is determined. This
experiment has been performed on three different models of car swirl diffuser having different slot angles of 120, 130 and
140.