A cottage, which can be rented for short stays, can be a good choice to publicize the still unknown Passivhaus standard in Spain. Rehabilitation was an interesting option to test the feasibility of the standard in the restoration of buildings.
The starting point was a building in Íbero, a small town near Pamplona, Navarra. The existing building had an irregular plant, with a stone east facade to the Larreberri street, and west facade to the inner courtyard. The construction of this house is traditional, with stone load-bearing walls, wooden beams and ceramic brick cover. It was decided to keep the outer shell, so that the demolition of the other elements was a complex process.
Because we have tried to follow the Passivhaus standard, we have been taken into special consideration issues such as the tightness of the building, to prevent leaks, and the thermal envelope, to achieve a constant and pleasant indoor temperature. Therefore, the sheets have been placed in order to seal all elements of the structure, and a wood fiber insulation has been used through the inside, to isolate evenly all elements and avoid thermal bridges. In the hearth, however, isolattion was performed from the outside.
The housing is designed with a constructive system of laminated wood structure, built against the façade preserved and existing party walls, with blown insulation and interiors finished with plate plasterboard. Ceramic tiles cover and wooden beams have been preserved, using the wood fiber insulation blown by the interior and finish plasterboard. The forged against ground is designed as a hearth with EPS insulation on the outside, and finished with ceramic tiles.
A triple woodwork was chosen with glass and air and argon chambers; the position of the windows and their encounter with the enclosure changes from one facade to another: in the stone facades and old brick were placed with sub-frame, to the inner face; in the half-timbered facades they were placed inside rebateless.
The renovation of the indoor air is performed by a ventilation system with dual-flow heat exchanger of high efficiency, which allows us to heat fresh air driven by the heat extracted from stale air. With a continuous flow of filtered and renovated air, levels of CO2 and volatile organic compounds (VOC or VOC) are kept to a minimum. It has been installed in the ventilation system, a battery aftertreatment air, before pushing to acclimate the housing.
Production of domestic hot water (DHW) has been fixed with a heat aerothermal pump , to extract energy from the outside air, even at low temperatures. In turn, the heat pump is connected to the radiating panels installed on the walls of the rooms.
All facilities are domotized, which will control the ventilation system, heating and air conditioning, through the Loxone system, connected to a web server which can be accessed from mobile, tablet or PC.
Once the work was finished, the Blower Door seal test was performed, obtaining a result of 0.6 renovations, thus meeting the Passivhaus standard.
A cottage, which can be rented for short stays, can be a good choice to publicize the still unknown Passivhaus standard in Spain. Rehabilitation was an interesting option to test the feasibility of the standard in the restoration of buildings (...)