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Selecting Ventilation System in Comfort Environments

A quick selection guide of ventilation system in comfort environments

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The cooling capacities of air-condition systems are often determinant for selecting the types and principles. The cooling limits for the systems are often set by comfort requirements. Typical maximum cooling capacities of some common types of displacement and mixing systems in different kind of buildings are roughly set in the table below.

Type of building Ventilation system Ventilation principles and Cooling loads (W/m2)
Mixing Displacement
Offices CAV 0 - 20 10 - 30
VAV 20 - 60 20 - 60
Fan-coil 40 - 70
Cooling ceiling 60 - 100 60 - 100
Hotels CAV 0 - 20 10 - 30
VAV 20 - 50 20 - 50
Fan-coil 20 - 50
Hospitals CAV 0 - 20 10 - 30
VAV 20 - 60 20 - 60
Cooling ceiling 60 - 100 60 - 100
Public buildings CAV 0 - 20 10 - 30
VAV 20 - 60 20 - 60
Department stores CAV 0 - 20
VAV 20 - 80
Fan-coil 40 - 100

The heat load in typical rooms are influenced by the use of lights, heat emission from machines like computers, the number of people and the sun radiation through windows and other building elements. The heat load is typically very dynamic and for larger building and systems some kind of computerized tools should always be used in the design.

Heat loads in some typical rooms can be found in the table below:  

Typical rooms and heat loads Heat Load
(W/m2)
Normal offices without automatic 0 - 30
Normal offices with automatic 30 - 50
Conference rooms 20 - 75
Data rooms > 60
Guest rooms, normal standard 0 - 25
Guest rooms, high standard 25 - 50
Patients rooms 0 - 20
Treatment rooms 20 - 60
Intensive rooms > 50
Conference rooms 20 - 75
Theatre, cinema 40 - 60
Restaurants 30 - 70
Class rooms 20 - 50
Food 20 - 40
Normal 30 - 60

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