Practices

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Poikkilaakso School Helsinki, Finland, AdVent Case 8

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The Poikkilaakso School was a pilot project in which some elements typical for hybrid systems were combined with mechanical ventilation. The ventilation system is a fully mechanical low pressure system, having central air-handling unit including filtering, heat recovery, fans, heating coil and silencers. The aim was to achieve low heating and electricity consumption by using demand controlled supply ventilation to individual rooms, with air transferred via internal rooms to a single central exhaust and heat recovery between main exhaust and supply ducts.

Acronym of the case

AdVent Case 8

Author(s) information

Name

Jarek Kurnitksi

Address

Helsinki University of Technology

Email

Name

Jari Plaonen

Address

Helsinki University of Technology

Email

Lessons learnt

High user satisfaction has been reported in previous studies. School staff has many times pointed it out that there is a “feeling of natural ventilation” in the building with no suspended ceilings and no visible ducts, but the use of displacement ventilation air distribution was found to pose problems, because in the classrooms desks and small cupboards were placed directly near the diffusers, in some cases blocking 20 to 50% of the diffuser area. Previous measurements show that south façade classrooms overheated during hot periods in the summer. This is a result of poor solar protection and the lack of other relevant measures such as night ventilation cooling or air conditioning. This school was one of the first designed with a demand- controlled ventilation system and experienced a number of operating problems. These have been solved in similar schools designed subsequently.

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