Work in progress on new Carignano Kindergarten
Three schools with separate, coloured units, arranged in a comb-like fashion and orientated towards the sun, linked by a group of studios and services. The complex is characterised by a long glass wall, through which you can catch a glimpse of the large rainbow painted on the ground. Innovative technology and tailored fittings transform the building into a workshop where children can learn how to save energy and protect the environment. The building, prefabricated in XLam wood and natural materials and assembled using drywall techniques, will be classified as “near zero energy”, as approximately 1.5 litres of fossil fuels per metre2 per year will be sufficient to provide heating and hot water.
The first load-bearing walls, in XLam cross-laminated glulam wood panels, have been installed!
While the Corps A growing, preparing foundations with ventilated crawl spaces for ventilation asylum bodies B and C
After completing Unit A, we carried out the Blower Door Test, which allows us to check the building’s seal.
This method allows us to identify “air losses” present in the building shell and to evaluate the flow (or rate) of air change. The building passed the test at the first time of asking, with a result of 0.21/h (i.e. 0.21 air changes every hour) and thus comfortably complies with Passive Building requirements (limit of <0.6/h) [caption id="" align="aligncenter" width="635"] Unit A completed with Blower Door Test[/caption]
The Blower Door Test was also carried out on Unit B, once the load-bearing structure had been finalised. Using a specially designed ventilator, air is blown into and drawn out of the building. The strength of the ventilator is regulated to adhere to a preset difference between internal and external pressure. The difference in pressure between two sections of atmosphere is the cause of air flows. The ventilator is mounted in a frame, which is then attached to the entrance door, thus earning it the name Blower Door Test.
Instruments that measure the pressure difference and airflow intensity are attached to the ventilator. The rotation speed of the ventilator is regulated so that a specific difference between internal and external pressure is created. As a consequence, an air flow is generated which compensates for “losses” in pressure differences due to seepage. The air flow recorded is divided by the building volume. This figure can then be compared with other buildings and normative standards to gauge the quality of the building’s seal. Given that air seepage corresponds to thermal loads which the heating/air conditioning system of the building must compensate for, the Blower Door Test is crucial for evaluating the thermal-energetic performance of buildings, especially if high energetic efficiency is desired.
The specific calculation process is regulated by norm UNI EN 13829: “Thermal performance of buildings – Determination of air permeability of buildings – Pressurisation method using ventilator”.