CFD Computer Simulation Consultant
Center for Computational Fluid Dynamics
CFD Computer Simulation Consultant
Dena Hendriana, Sc.D
dena.hendriana@sgu.ac.id
dhendria@gmail.com
HP: +(62) 812 1371 5844
(WA message or Call)
www.CenterForCFD.com
Address:
Alam Sutera
Tangerang 15143
Banten - Indonesia
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Massachusetts Institute of Technology Alumni
Research Center @ Tangerang, Indonesia
Air Conditioning System - Outdoors and Outlets
The purpose of CFD analysis for air conditioning systems :
- To optimize the performance of A/C outdoor system by minimizing air recirculations to the A/C outdoor heat exchanger.
- To predict air temperature entering the A/C outdoor inlets.
- To optimize A/C outlets for maximum comfort of the occupants.
- To predict air temperature distribution inside the rooms.
- To optimize A/C diffuser with balanced outlet airflow and minimum pressure drop.
CFD analysis is very useful to optimize A/C outdoor cooling efficiency. The main objective of the analysis for A/C outdoors is to minimize ambient air recirculation around the A/C outdoors that will reduce heat release from the A/C outdoor heat exchanger to the ambient air. The air recirculations can be predicted by CFD with post-processing of air temperature and air streamlines. These air recirculations will show higher air temperature entering the A/C outdoor inlets. Solutions for this problem can be studied and verified by CFD simulations, such as A/C outdoor repositioning, removing airflow blockage, utilizing tunnels, etc.
CFD simulations is also used for optimizing position and size of A/C outlets, and louver direction of the outlets. A/C outlet size and position is analyzed to maximize comfort for the people inside the room. Comfort of the occupants depends on air temperature and air velocity. Too high or too low air temperature will make people uncomfortable. Correct air mixing to meet certain air temperature, around 25C, will improve the comfort.
Too high air velocity will make people uncomfortable, but zero air velocity around people will make feeling too hot and unfresh. People will feel comfortable with air speed around 1.5 m/s. Adjustment of A/C outlets in terms of positioning, size of the outlets, direction of the nozzle, air velocity at the outlets, etc. will improve well balanced of air temperature and air velocity distribution in the room.
Optimization of A/C diffuser design can be done using CFD simulations. The purpose of the analysis is to have well distributed air velocity at the outlet. The airflow is also going in the way we desire, such as making a nice swirl around the room. Another purpose of the analysis is to reduce air blockages indicated by large pressure drop. Larger pressure drop means larger air pressure drives, such as air pumps. It will require higher electric power to drive larger air pressure.