scholarly journals A CFD analysis of room aspect ratio on the effect of buoyancy and room air flow

2007 ◽  
Vol 11 (4) ◽  
pp. 79-94 ◽  
Author(s):  
Brajesh Tripathi ◽  
Moulic Sandipan ◽  
Late Arora
Keyword(s):  
Temperature Distribution ◽  
Distribution System ◽  
Air Distribution ◽  
Cooling Load ◽  
Cfd Analysis ◽  
Uniform Temperature ◽  
Air Volume ◽  
Recent Developments ◽  
Careful Design ◽  
Occupied Zone

Comfort conditions in air-conditioned rooms require that temperature in the occupied zone should not vary by more than 1?C and velocity, every where in the room, should be less than 0.15 m/s so that occupants do not feel draft. Recent developments in providing effective insulation and making leak tight buildings are considerably reduced the cooling load requirements and the supply airflow rates. Obtaining uniform temperature distribution with reduced air volume flow rates requires careful design of air distribution system. This study aims to find velocity and temperature distribution in the room towards this end.

Effect of Buoyancy on Room Air Flow

2004 ◽  
Author(s):  
B. Tripathi ◽  
R. C. Arora ◽  
S. G. Moulic
Keyword(s):  
Temperature Distribution ◽  
Distribution System ◽  
Coanda Effect ◽  
Air Distribution ◽  
Air Volume ◽  
Recent Developments ◽  
Coandǎ Effect ◽  
The Right ◽  
Careful Design ◽  
Occupied Zone

Thermal comfort and ventilation needs of spaces are met by supplying “conditioned” air, which is a blend of outdoor and recirculated air that has been filtered, heated or cooled, and sometimes humidified or dehumidified. Comfort conditions in air-conditioned rooms require that temperature in the occupied zone should not vary by more than 1°C and velocity, every where in the room, should be less than 0.15 m/s so that occupants do not feel draft. Recent developments in providing effective insulation and making leak tight building shell have considerably reduced the cooling load requirements and the supply airflow rates. Obtaining uniform temperature distribution with reduced air volume flow rates requires careful design of air distribution system. This study aims to find velocity and temperature distribution in the room towards this end. Coanda effect, effect of buoyancy and wall boundary layers has been observed in this investigation. The Coanda effect is observed in all the cases of laminar flow. Cold fluid enters in the room near the ceiling, the flow attaches with the ceiling, comes down along the right wall and goes out from outlet.

Analysis of Thermal Comfort and Contaminant Removal in an Office Room With Underfloor Air Distribution System

2005 ◽  
Author(s):  
Son H. Ho ◽  
Luis Rosario ◽  
Muhammad M. Rahman
Keyword(s):  
Relative Humidity ◽  
Thermal Comfort ◽  
Distribution System ◽  
Air Distribution ◽  
Contaminant Removal ◽  
Case Scenario ◽  
Steady State Condition ◽  
Human Thermal Comfort ◽  
Underfloor Air Distribution ◽  
Occupied Zone

The study of human thermal comfort requires detailed information about distributions of air velocity, air temperature and relative humidity in an occupied zone. Air quality is related to the contaminant distributions and contaminant removal effectiveness in indoor environment. This paper presents an evaluation of thermal comfort and contaminant removal for an office setting with underfloor air distribution system by the use of computational fluid dynamics modeling. A typical single cubicle in a large office floor in steady state condition of airflow as well as heat and mass transfer is investigated for both cooling and heating scenarios. The model includes a typical cubicle in a large office floor with a chair, a desk with a personal computer on its top, and heat sources such as seated people, computer monitor and CPU, and lights. Air enters the occupied zone through an inlet located at the floor level supplying a vertical upward inflow. Five different locations of the inlet diffuser, three different inlet air speeds, and four different loads of heat loss through the floor slab in heating case scenario were considered. Distributions of velocity, temperature, relative humidity, and contaminant concentration in such cases were computed. The results were compared among various simulation cases and showed reasonable agreement with experimental data taken from related literature.

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