INVESTIGATION OF COOLING CONDITION OF A ROOM WITH AIR-CONDITIONING WORKING CONCURRENTLY WITH AIR SUPPLY AND DISCHARGE SYSTEMS – A CASE STUDY

Abstract

This paper investigates cooling condition in the air-conditioned room working concurrently with air supply and
discharge systems. Case studies were conducted for a kitchen located at INTI Subang, Malaysia. The study was
conducted by measuring temperature, humidity, pressure and air velocity, followed by simulation studies using ANSYS-Fluent workbench to predict indoor thermal condition and other useful parameters. Simulation results were validated with experimental results, after which four case studies were performed to analyze their effects on human comforts and observe an optimal condition of each case. The four cases considered were: both windows and doors open (additional window) (Case 1), closed doors and windows open (additional windows) (Case 2), additional ventilation system (Case 3), and exhaust with half closed valve (Case 4). It was observed that Case 1 provided best indoor condition with the room temperature only at 296.4 K, which was 8.3 K lower than that of the original kitchen. The peak temperature for this case was also found the smallest. The addition of electronic valve between the main ventilation pipe and the negative outlet reduced the room temperature less efficiently compared to Case 1.
Keywords: Air-conditioning, indoor temperature, humidity, air discharge, air inlet