A REVIEW PAPER ON EVALUTION OF CIRCULAR SWIRL FLOOR DIFFUSER UNDERFLOOR AIR DISTRIBUTION SYSTEM USING CFD

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A 3D-CFD investigation of airflow, temperature distribution and thermal comfort in laboratory room of a university conditioned with underfloor air distribution (UFAD) system is presented for different operating and geometric conditions. The geometric configuration is a room (4.65m x 3.63m x1.98m) that includes four windows with the same dimensions (0.735 x 0.92 m), two circular diffusers having the diameter of 0.3568m and an exhaust grille (0.74 x 0.3m). While in the previous work, the geometric configuration of the room was same as in our work except two rectangular diffusers having the same dimensions (0.5 x 0.2m). Simulations are implemented, using a commercial CFD package (Fluent 14.5), to understand the effects of supply air temperature, supply air velocity, space height and number of supply air diffusers on the performance of the air conditioning system and thermal comfort. The airflow and temperature distribution in the conditioned space, UFAD system is capable of creating smaller vertical variations of air temperature and a more comfortable environment and energy saving the supply air velocity and temperature, number of diffusers and height of the space have a significant impact on thermal comfort.

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