ملخص البحث :

A modified version of a three dimensional computer program FLUENT (6.3.26) was used to simulate the complex flow inside the room. The present computational program was validated by comparing the numerical results with experimental data of other study, This comparison show a good agreement. Two main cases were studied with respect to the number of heat sources which were:- 1. Case I: Includes ventilated room with single heat source and one person. 2. Case II: Includes ventilated room with double heat sources and two persons. The effect of ventilation rate corresponding to supply velocities (0.25–0.35 m/s) which is recommended by ASHRAE 2007, supply air temperatures (17 & 19oC) and exhaust grille location on the thermal comfort were investigated based on air distribution performance index (ADPI) in the room. For case I with a heat source of (50 W/m2) heat rejected, the ventilation rate is equal to (6.84 ACH), and supply air temperature of (19 oC) is needed to give better thermal comfort with ADPI equal to 83.6%. For case II with double heat sources each with (50 W/m2) heat rejected, (8.30 ACH) ventilation rate and supply air temperature of (19oC) were needed to get ADPI equal to 83.6%.

ملخص البحث :

A two dimensional turbulence (SST, k- ) model is used to predict the distribution of air velocity and temperature in a 2-D office room, containing one person and office furniture for two ventilation conditions. This study use a commercial CFD code FLUENT (version 6.3) for solving the Navier Stocks, energy and turbulence equations using finite volume techniques. The results were presented as velocity vectors with quantitative velocity and temperature distribution. The result can be divided into two parts, First part compared with published result and gives good theoretical agreement, the second part was taken at boundary conditions (Vin, Tin and Twall) according to the Iraqi environmental condition depend on the Iraqi cods of cooling 2012