Efisio Orano, 9-29, Colli Aniene, Rome. The building is a large multifamily house with 80 dwellings (around 90 m² each) distributed in 5 staircases, on 8 floors. It is part of a cluster of 5 similar buildings (240 dwellings) that were built by AIC (Associazione Italiana Casa) in the late 70s and are planned to be renovated in parallel with BuildHeat. The city quarter is made of around 2,200 apartments.
The building has a concrete structure with non-bearing brick walls and a flat concrete roof. Its external surfaces are not insulated while its windows have single-pane glass. Inhabitants are the owners of the apartments in the building.
Monthly average temperature is 7.8°C on January and 24.5°C on August.
The 5 staircases are connected to a centralized gas boiler providing space heating. Each dwelling produces its own DHW using a methane boiler (25-30 kW). Single split units provide cooling to part of the dwellings. Space heating and DHW consumption are in the range of 140 and 25 kWh/m² per year respectively. The heating bill ranges from 365€ up to 1840€ per year for each apartment. These constitute to an average heating bill range of 835€ per year for the whole building. DHW energy consumption has been estimated around 240-260 € per year for each apartment.
Renovation is focused on both the external envelope and the HVAC system. The envelope performance will be upgraded with a pre-fabricated active façade. The south side of the building presents a solar thermal collector façade system. For each staircase, a centralized HVAC system, which is being run by an air-water heat pump, provides the space heating and cooling, and domestic hot water. On the other hand, a wall-mounted storage (140 liters) per dwelling integrated with a mechanical ventilation device maximizes the renewable energy harvesting and storage. A control system installed both within the dwellings and the building itself will be able to predict and to minimize the electric consumption cost and to exploit solar energy.
Maestro Telleria, Barrio Oliver, Zaragoza. The building is a large multifamily house with 53 dwellings. It has dwellings with sizes of 85 m² and of 55 m². The apartments are distributed in 5 staircases on 4 floors. It is part of a small quarter in the outskirts of Zaragoza.
The building has a concrete structure with non-bearing brick walls and flat concrete roof. Single-pane glass windows are installed. The building was constructed in 1988, is owned by ZAVI and is used for sheltered housing.
Monthly average temperature is 6.2°C on January and 24.8°C on August.
Single electric heaters are installed in each dwelling. The heaters provide DHW water to all dwellings and drive radiators in half of them, while, the rest is setup with electric radiators. Single split units provide cooling to a part of the dwellings. The average electrical consumption for every dwellers’ usage, i.e. lighting and appliances, per apartment ranges between 3,000 and 4,000€ per year and can go up to 7,500€ per year in some apartments.
Renovation includes upgrades for both external envelope and HVAC system. A pre-fabricated insulation will be installed on the south, east and west façades. Moreover, all windows will be replaced with double-glazed windows. Each dwelling will have a de-centralized HVAC system being run by air-air heat pump to cover the space heating and cooling, and DHW demands.
Albion Towers, Cross Ln, Salford M5 4AH, United Kingdom. The Albion tower is a 17-storeys building with 100 dwellings, 2 bed flats. It is located in Salford, in the metropolitan area of Manchester. The building belongs to Salix Homes.
The building has a concrete structure with non-bearing brick walls and flat concrete roof. External surfaces are not insulated and windows have single-pane glass. Asbestos has been found in risers while no fire breaks were found.
Monthly average temperature is 3.8°C on January and 15.7°C on August.
Space heating and DHW are covered by individual gas boilers. The peak power ranges between 3 and 6 kW of heat demanded per flat.
The existing individual gas boiler will be replaced with water-to-water heat pumps. A water loop at building level connects the single heat pumps to a geothermal field. Boreholes for the ground exchange will be installed underneath the parking area adjacent to the building. Dwelling wall-mounted storages (140 liters) will be used to maximize the thermal storage capability of the heat pumps.