Building with low energy consumption is not only a legal obligation, it is ecological, cultural and moral. An energy efficient house costs less, is worth more and ensures superior comfort.
Alpac’s objective is to guarantee high levels of heat insulation precisely where window frames and roller shutters are fitted.
Alpac PRESYSTEM successfully creates a thermal break, giving top sector transmittance values and meeting the standards of the strictest energy certifications, such as PassivHaus and KlimaHaus Gold. By using materials with low heat conductivity, such as polystyrene, Alpac contributes to a responsible, sustainable, better building.
Since the last decade, Italian and European laws have attempted to interpret an increasingly more widespread sensibility for issues like building quality, energy saving and respect for the environment.
Here are the crucial steps:
- 1991: initial Italian legislation outlined the certification procedures for rational use of energy and the development of renewable sources.
- 2005 and 2006: the European directives on building energy performance that define legal standards and reiterate the goals set by the Kyoto Protocol were transposed in Italy.
- 2008: European countries worked out a “climate-energy package” that summarises the goals to meet in 2020 in the “20/20/20” formula: 20% reduction in greenhouse gas; use of renewable energy for at least 20% of needs; 20% reduction in consumption.
- 2009: a decree gave Italian guidelines for building energy certification.
- 2010: the new European Directive on building energy performance came into force.
Overview of savings
Buildings in the highest energy classes have better energy performance and as a consequence also considerable economic savings.
The following table highlights that a Class A building type costs seven time less than a pre-2005 standards building.
|TERRACE HOUSE TYPE||HEATED NET SURFACE||CONSUMPTION OF m³ OF GAS PER m²||AVERAGE COST OF METHANE GAS||ESTIMATED ANNUAL EXPENDITURE FOR HEATING|
|Home PRE 192/05 – 311/06 standards||136,00 mq||20 mc/mq||0,70 €/mc||1904,00 €|
|Home RESPECTING 192/05 – 311/06 standards||136,00 mq||9 mc/mq||0,70 €/mc||856,80 €|
|CLASS “B” home||136,00 mq||4,8 mc/mq||0,70 €/mc||456,96 €|
|CLASS “A” home||136,00 mq||2,8 mc/mq||0,70 €/mc||266,56 €|
Thermal conductivity (λ)
The ability of a material to transmit heat, regardless of the shape of the material itself. Unit of measurement W/Mk.
Thermal resistance (R)
The ratio value between the thickness and thermal conductivity of a material. It indicates how much difficulty heat has in moving through an element. Unit of measurement m2K/W.
Thermal transmittance (U)
The quantity of heat that passes through one or more elements at a given difference in temperature in actual conditions. Unit of measurement W/m2K.
Periodic thermal transmittance (ψiE)
The parameter used to evaluate the ability of an opaque wall to reduce and displace the phase of the heat that flows through it over a 24-hour period. Unit of measurement W/m2K.
Linear thermal transmittance (ψ)
Calculation value to be used as a correction coefficient for the thermal bridge. It evidences the heat flow in actual conditions divided by the length of the thermal bridge and the difference in temperature between the environments on either side of the thermal bridge. Unit of measurement W/mK.
The traditional system or Alpac PRESYSTEM?
In all solutions insulated with Alpac PRESYSTEM the inside of the home is much warmer than with the traditional solution. This therefore eliminates the possible formation of surface condensation, at the same time guaranteeing maximum heat insulation. At the point where inside and outside come into contact, determined by the window frame, heat is dispersed faster with the traditional solution than with the ALPAC insulated solution. This leads to the probable formation of thermal bridges, which over time cause:
- energy dispersal through the stud opening
- formation of condensation
- formation of mildew
- damage to surfaces.