Abstract
Problem statement: This study reported a numerical investigation of t hree-dimensional turbulent buoyant recirculating flow within a room with heated obstruction. Approach: The study involved the solution of partial differential equat ions for the conservation of mass, momentum, energy, concentration, turbulent energy and its dissipation rate. These equations were solved together with algebraic expressions for the turbulent viscosity a nd the heat diffusivity, using k-e turbulence model. Results: The present study demonstrated the flow behavior, t hermal distribution and CO 2 concentration inside the room in the presence of he at flux obstruction with respect to three sizes of obstruction. Conclusion: The energy usage coefficient (efficiency of ventila tion) increases with decrease in size of obstruction. Concentration of C O 2 is very often used as an indicator for the control of air flow rate to the building. For the largest s ize of obstruction, the concentration of CO 2 is maximum above the obstruction and reduces with the reduction in the size of the obstruction.
Highlights
Air-conditioning is a process that simultaneously conditions air; distributes it combined with the outdoor air to the conditioned space; and at the same time controls and maintains the required space’s temperature, humidity, air movement, air cleanliness, sound level and pressure differential within predetermined limits for the health and comfort of the occupants (Wang and Lavan, 1999). Moureh and Flick (2005) carried out experiments and numerical simulations in order to characterize velocities and airflow patterns within a long and empty slot-ventilated enclosure characterized by the presence of inlet and outlet sections on the same side at the front
Craven and Settles (2006) applied experimental velocity measurements by using particle image velocimetry PIV and a computational fluid dynamics CFD simulation was performed of the human thermal plume in a standard room environment with moderate thermal stratification
0.42; (b) case -2, b/h = 0.83; (c) case 3, b/h = 1.66 three cases occurs near the opening inlet due to the jet Velocity of The air at inlet (2 m/sec) is reduced and of ventilation and constant air flow rate
Summary
Air-conditioning is a process that simultaneously conditions air; distributes it combined with the outdoor air to the conditioned space; and at the same time controls and maintains the required space’s temperature, humidity, air movement, air cleanliness, sound level and pressure differential within predetermined limits for the health and comfort of the occupants (Wang and Lavan, 1999). Moureh and Flick (2005) carried out experiments and numerical simulations in order to characterize velocities and airflow patterns within a long and empty slot-ventilated enclosure characterized by the presence of inlet and outlet sections on the same side at the front. There are four different ventilation principles used to control the air distribution within ventilated rooms namely, unidirectional flow ventilation, mixing ventilation, displacement ventilation and local exhaust ventilation (Zou Yue, 1999). Recent researches turned their efforts towards finding an alternative approach based on the numerical solution of the governing flow equations for mass, momentum and scalar properties. The effects of thermal stratification on the plume were explored via comparison with the results of a CFD simulation in a uniform environment Gosman et al (1980) carried out measurement and calculation properties relevant to the flow in ventilated rooms.
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