MEBS6008 Environmental Services II

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Space Air Diffusion III

1.  Unidirectional Flow

• Principles and advantages
• Cleanrooms and ventilating ceiling
• Hospital applications - operating theatre
• Hospital applications - isolation wards

2.  Projecting Flow

• Benefits and disadvanatges
• Industrial spot cooling systems
• Desktop task conditioning systems

3.  Air Flow Analysis

• Computational fluid dynamics (CFD)
• Common applications
• Turbulence modelling and Navier-Stokes equations
• Governing equations

[Download PowerPoint file (3.0 MB)]

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References:

• ASHRAE, 1990. ANSI/ASHRAE Standard 113-1990, Method of Testing for Room Air Diffusion, American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc., Atlanta. [RD 697.00218 A82 S78 A]
• Ladeinde, F. and Nearon, M. D., 1997. CFD applications in the HVAC&R industry, ASHRAE Journal, 39(1): 44-48. [PDF]

Web Links:

• Underfloor Air Technology [Center for the Built Environment, University of California, Berkeley]
• Task/Ambient Conditioning Systems
• The Basics of Computational Fluid Dynamics Modeling [Flow3D]
• Navier-Stokes Equations (Foundations of Fluid Mechanics) [Cambridge University Press]
• FLOVENT Applications

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| Created: Nov 2004 | Update: 8 Mar 2005 | By: cmhui@hku.hk |