Selecting Ventilation System in Comfort Environments

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A quick selection guide of ventilation system in comfort environments

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)
Type of building	Ventilation system	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
Public buildings	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

A quick selection guide of ventilation system in comfort environments

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