Numerical and experimental investigastion of velocity and temperature distrubution of an air conditioned room

The supply, distribution and suction of the air in the room are provided with grilles and diffusers. If the correct grille cannot be selected after the necessary calculations are made, thermal comfort cannot be provided. When the buildings with thermal comfort problems are examined, it is seen that the majority of the problem arises from the choice of inappropriate grills and diffusers. This creates huge costs. In this thesis, it is accepted that different grilles and diffusers (square, slot, jet) are used for ventilation to the office room which is 4x3x3.5 meters in size. Thermal comfort was examined with the predicted mean vote (PMV) and predicted percentage of dissatisfied (PPD) indices at 0.1, 0.6 and 1.1 meters above the ground. These investigations were solved numerically by computational fluid dynamics (CFD). RNG k - ε turbulence model was used in the analyzes. The vent air outlet velocity was calculated as 2.5 m / s and it was assumed that 100% fresh air was supplied to the room by the air handling unit. According to the summer conditions of Osmaniye, heat loss / gain was calculated and heat flux was given to the walls, floor and ceiling of the site. It was assumed that there were refrigerator, lamp and people in the room and they were given heat flux. While PMV and PPD values were calculated, velocity and temperature values were calculated from CFD program, activity level (metabolic rate), average radiation temperature, clothing thermal resistance, relative humidity values were taken constant. PMV and PPD values obtained from different grilles were compared with each other. As a result of the comparison, it was determined that the square grill provides the most thermal comfort. In this thesis, a 1/10 scale office model with a jet nozzle is used and the flow analysis in the office model is investigated experimentally using Particle Imaging Velocity Measurement (PIV) technique. Experimental and CFD velocity results are compatible