Ansitz Kofler - Heating / Ventilation

Heating The ancient gas boiler was replaced by a pellet boiler, which supplies the all 5 apartments in the building complex with warm water for heating and DHW. While the other four apartments use classical high temperature radiant systems, the retrofitted Orangery here presented has a floor heating system. Ventilation Centralized mechanical ventilation system with heat recovery with ducts integrated in the floor. The ventilation unit is placed in a crawlspace above the kitchen, benefitting from the ample room height of 4m. The distribution ducts are integrated in the anyway refurbished floor, together with the hydraulic system in a concrete layer between thermal and sound insulation. The installed ventilation system provides balanced air flow and achieves a maximum volume flow rate of 300m³/h – to reach the required air change volume of 0.4 m³/h and provide living areas up to 220 m² with fresh air, level 2 with 220 m³/h will be sufficient.

Heating At Ansitz Kofler there was no space available in the house or basement for fuel storage, but the pellets could be stored in a tank buried in the garden and are brought to the reservoir in the heating room with a suction turbine. Burying the tank could be combined with the earth works anyway done for the tubes allowing to pre-heat the ventilation air in winter and pre-cool it in summer. Integrating the distribution ducts in the floor allows to hide them, nevertheless this measure can be adopted only if modifications to the existing floors are not restricted. In the case of Ansitz Kofler the existing floor were tiles on some cm of screed on earth ground – dating anyway from 1925 and not from the Orangerie, it was not worthy of preservation. Ventilation Compatibility with conservation: Integrating the distribution ducts in the floor allows to hide them, nevertheless this measure can be adopted only if modifications to the existing floors are not restricted. Moisture safety: With ventilation systems high indoor humidity which might induce condensation within the construction at any weak point is avoided. Energy improvement: A central system for controlled ventilation with heat recovery ensures not only that the necessary exchange of air takes place automatically but also that the incoming air from outdoors is warmed by cooling the exhaust air (the “Air-to-Air Heat Exchanger” recovers up to 85 percent of the heat from outgoing air). Introducing an automatic summer bypass unit guarantees that the outside air almost completely bypasses the heat exchanger preventing the supply air from being additionally warmed during warm summer months.