Low-energy cooling of rooms with chilled ceilings and ceiling-mounted devices

Energy-efficient and comfortable cooling systems have recently gained considerable attention in removal of heat loads from large office spaces and industrial buildings. Here in this paper, somewhat similar heat load removal analysis is made for rooms with not so large dimensions. The ceiling of the room is chilled. The supply velocity is kept in small values. In order to enhance the circulation in the room, a wing-like structure is mounted to the ceiling. A transient heat transfer problem involving conduction and mixed turbulent convection and relative humidity is studied with solving the 3-D unsteady full Navier–Stokes equations numerically. CFD is resorted to as a tool for the flow analysis. The results show that using wing-like structure in the room with chilled ceiling provides better ventilation and this approach does not need any chemical substances such as CFC. Copyright © 2005 John Wiley & Sons, Ltd.

[1]  Hee-Jin Park,et al.  The effect of location of a convective heat source on displacement ventilation: CFD study , 2001 .

[2]  S. Kato,et al.  Effects of outdoor air conditions on hybrid air conditioning based on task/ambient strategy with natural and mechanical ventilation in office buildings , 2004 .

[3]  S. C. Sekhar,et al.  Impact of airflow profile on indoor air quality—a tropical study , 2004 .

[4]  Youngjun Cho,et al.  Theoretical and experimental investigation of impinging jet ventilation and comparison with wall displacement ventilation , 2002 .

[5]  Hazim B. Awbi,et al.  A study of the air quality in the breathing zone in a room with displacement ventilation , 2001 .

[6]  M. Woloszyn,et al.  Numerical prediction of indoor air humidity and its effect on indoor environment , 2003 .

[7]  Martin Behne,et al.  Indoor air quality in rooms with cooled ceilings.: Mixing ventilation or rather displacement ventilation? , 1999 .

[8]  Dennis L. Loveday,et al.  Displacement ventilation environments with chilled ceilings: thermal comfort design within the context of the BS EN ISO7730 versus adaptive debate , 2002 .

[9]  P. F. Grigg,et al.  Chilled ceilings and displacement ventilation , 1998 .

[10]  Philip Haves,et al.  Numerical investigation of transient buoyant flow in a room with a displacement ventilation and chilled ceiling system , 2001 .

[11]  Shuzo Murakami,et al.  Coupled simulation of convicton, radiation, and HVAC control for attaining a given PMV value , 2001 .

[12]  E Ery Djunaedy,et al.  Thermal comfort study of an air-conditioned lecture theatre in the tropics , 2003 .

[13]  Z. D. Chen,et al.  Buoyancy-driven displacement natural ventilation in a single-zone building with three-level openings , 2002 .