Indoor air performance and irreversibility analysis of a slot-ventilated mechanical system with wall heater and thermosolutal exchanger

Abstract

A numerical simulation is performed for fluid flow, heat and mass transfer in a slot-ventilated enclosure to optimize the removal rate of heat and contaminants due to wall heater and a thermosolutal exchanger. Cold fresh air is infiltrated through the inlet port located along right vertical wall and flush out through the chimney shaped outlet port located along the upper wall. Vertical walls of the chimney are considered to be inclined at different angles with horizontal axis. Two dimensional analysis is made for flow, temperature and concentration in terms of streamlines, isotherms and isoconcentrations with the variation of Richardson number (Ri) from 0.0 to 10.0, Reynolds number (Re) from 50 to 300 and inclination angle of chimney (450 ≤ δ ≤ 900) with the fixed value of Prandtl number (Pr=0.71) and Schmidt number (Sc=1.14). The impact of inlet port locations, Reynolds number, inclination angle and Richardson number on average rate of heat transfer and mass transfer, average temperature, entropy generation, Bejan number, cooling efficiency, air change per hour and performance evaluation criterion inside the system is evaluated.