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The present work is a numerical study of the transient mixed convection flow in a ventilated enclosure made
up of air-filled inclined walls with discrete time periodic heat sources. The lower and upper walls are inclined
at different angles with horizontal axis and their respective length is considered as of the order of vertical
walls. Using co-ordinate transformation, the physical domain is transformed to computational domain and
the governing equations are solved by using FVM based SIMPLE algorithm. An inlet port with cold fresh air
from the outside atmosphere is considered along the left vertical wall and flush out through the outlet port
along the right vertical wall. A two dimensional projection analysis is made by computing the temperature
fields, thermal and fluid irreversibilities and flow lines for various values of Richardson number and inclination
angle with Reynolds number *Re* = 50, 100, 300, 500 and Prandtl number *Pr* = 0.71. The impact of
inclination angle and Richardson number on average heat transfer rate, mass transfer rate, entropy generation,
Bejan number and cooling efficiency inside the enclosure is considered to find the effective performance of
the system. We have observed a significant temperature variation by changing the inlet fluid velocity and
temperature with the inclination angle.