Evaluation of the alternative strategies in the case building
| Strategy | Supply and exhaust ventilation | Preserving the current ventilation strategy with lower number of users |
|---|---|---|
| Advantages | The high number of pupils, 25 – 30, in each classroom, and approximately 500–600 users in the entire building; Ventilation can be adjusted based on the use; and The new system can be used to control the thermal environment and humidity in the building | Minor design and implementation costs and minor maintenance costs |
| Downsides | High design and implementation costs; High use and maintenance costs; New ducts and devices diminish the room space of each classroom by about 1–2 sq m; and The need of a high level of expertise in design and implementation | Low space utilisation rate – only about 15 pupils in each room and approximately 400 users in the entire building; challenging to adjust the ventilation rate; and for ensuring the functionality of the system, it might be worthwhile to isolate the rooms with exhaust ventilation or not to use the mechanical ventilation at all |
| Health effects/Risks | High ventilation rates could lower the levels of CO2; the thermal environment and humidity level could be improved by adjusting the ventilation system; and the risk of pollution entering from structures due to the air pressure changes | Window ventilation is still needed, and it could improve indoor air quality but lower the room temperature unpleasantly during winter, cause draught and reduce energy efficiency; Thermal discomfort will remain: overheating in summer and overcooling in winter; and The potential health symptoms caused by negative air pressure may remain |
| Strategy | Supply and exhaust ventilation | Preserving the current ventilation strategy with lower number of users |
|---|---|---|
| Advantages | The high number of pupils, 25 – 30, in each classroom, and approximately 500–600 users in the entire building; Ventilation can be adjusted based on the use; and The new system can be used to control the thermal environment and humidity in the building | Minor design and implementation costs and minor maintenance costs |
| Downsides | High design and implementation costs; High use and maintenance costs; New ducts and devices diminish the room space of each classroom by about 1–2 sq m; and The need of a high level of expertise in design and implementation | Low space utilisation rate – only about 15 pupils in each room and approximately 400 users in the entire building; challenging to adjust the ventilation rate; and for ensuring the functionality of the system, it might be worthwhile to isolate the rooms with exhaust ventilation or not to use the mechanical ventilation at all |
| Health effects/Risks | High ventilation rates could lower the levels of CO2; the thermal environment and humidity level could be improved by adjusting the ventilation system; and the risk of pollution entering from structures due to the air pressure changes | Window ventilation is still needed, and it could improve indoor air quality but lower the room temperature unpleasantly during winter, cause draught and reduce energy efficiency; Thermal discomfort will remain: overheating in summer and overcooling in winter; and The potential health symptoms caused by negative air pressure may remain |
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