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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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