With a constant temperature of 20 to 25 degrees Celsius all year round, a relative humidity of 35-55% and the concentration of carbon dioxide to be kept below 1000 ppm.
With an investment of 362 euros per square meter for the implementation of insulation and ventilation interventions and the installation of a photovoltaic system, a building can become passive and produce more energy (up to three times) than it consumes, drastically reducing energy consumption.
One of the first applications in Greece, a working-class apartment building on Piraeus Street, is close to completion. According to the data presented at a relevant conference organized by Hellenic Passive Building Institutein the presence of the mayors of Athens Haris Doukas and Moschato-Tavros, Andreas Efthimiou, the cost of the interventions in the specific building reached 201,020 euros or 362.92 euros per square meter. The results – when the work is completed – is that the building will produce more energy than it will consume, it will maintain a constant temperature of 20 to 25 degrees Celsius all year round, a relative humidity of 35-55% and the concentration of carbon dioxide will be kept below 1000 ppm.
Without the addition of the photovoltaic but with the implementation of the other interventions, the energy cost is limited to 1 euro per square meter per year, (100 euro per year for a 100 sq.m. apartment) as the energy consumption is reduced to 15 kilowatt hours per square meter per year.
The upgrade works implemented in the passive buildings include 5 axes:
- Thermal insulation on the roof, facade and basements,
- Replacement of windows, installation of triple glazing.
- Ensuring airtightness.
- Identifying and resolving thermal bridges.
- Mechanical ventilation with heat recovery.
Additional works that can be implemented are the modernization of the solar water heater, the installation of photovoltaics on the roof and smart electricity consumption meter, the installation of thermochromic glasses on the windows and the installation of photovoltaics on the facade of the building.
The presentation of “Passivistas: The Tavros Project” was made by Dimitris Pallantzas, building physicist, Nektarios Tsakumakis, mechanical engineer, Stefanos Pallantzas, president of the Hellenic Passive Building Institute, and Maria Kaltsa, architect.
Source: Skai
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