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Loft in Cassà de la Selva (Girona)

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Detailed description:
Detached house designed as an industrial-style loft following the most ambitious criteria of sustainable construction. The highest energy rating A was possible thanks to the use of an innovative thermal energy production system by aerogeneration (air-to-water) heat pump combined with floor heating and highly efficient PIR thermal insulation.
Building total surface: 126,45 m².

Building envelope:
PIR insulation boards covered on both sides with a multi-layered kraft-aluminium complex (thermal conductivity (lambda) = 0,023 W/m·K) in a continuous envelope without thermal bridges or condensation.

  • Floor: Poliuretanos PIR SL boards of 60 mm with a thermal transmittance of 0,38 W/(m²·K).
  • Facade: Poliuretanos PIR 7C boards of 100 mm with a thermal resistance of 0,23 W/(m²·K).
  • Roof: Poliuretanos PIR CM boards of 120 mm with a thermal resistance of 0,19 W/(m²·K).
  • Windows: aluminium with split of thermal bridge (U-value: 2,7 -2,8 W/(m²·K)).

Energy efficient technologies:

  • Heating system: aerothermal (air-to-water) heat pump that extracts heat from the outside air, generating at least 3 kW of free heating energy for every kW of electricity consumed and without direct emissions of CO2.
  • Floor heating: the heat is distributed throughout the loft via a low-temperature floor heating system.

Renewables:

  • Aerothermal (air-to-water) heat pump

Energy values:

  • Final energy demand: 37,4 kWh/(m²·a)
  • Primary energy demand: 51,3 kWh/(m²·a)
  • CO2 emissions: 12,7 kg/(m²·a)

Lessons learnt

The highest energy rating A was possible thanks to the use of an innovative thermal energy production system by aerogeneration heat pump combined with floor heating and highly efficient PIR thermal insulation.

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