CLIVET ELFOPACK: THE AERAULIC HEAT PUMP FOR CENTRO ZERO, THE RESIDENTIAL BUILDING CERTIFIED CASACLIMA CLASS A

Clivet systems have been utilized in numerous projects enabling them to obtain the Class A CasaClima certification. One example is the redevelopment of Centro Zero in Arezzo.

Centro Zero is the result of an urban redevelopment project, through the recovery and reuse of an abandoned area located in the nearby area of Arezzo.

The entire building, consisting of 12 flats, 4 commercial buildings, 16 garages and 25 outdoor parking spaces, has been designed according to the principles of the CasaClima directive, with the aim of achieving the maximum energy efficiency and environmental sustainability.

The building has a reinforced concrete structure, lateral-cement floors and poured brick infilling. The insulation is made up of graphite-filled expanded polystyrene (external insulation); mineral wool, polyurethane; and cellular glass for thermal breaks.

The external frames, in laminated wood, are laid on xps subframes equipped with sub-base and box with motorized roller blinds.

As far as the building envelope is concerned, and with the building being subject to CasaClima controls, insulation and air flow were accurately designed and monitored during the installation.

THE CHALLENGE

There was the need to respect the energy saving principles to achieve CasaClima Class A certification, the use of low cost plant with maximum energy performance and minimal environmental impact. The main challenge was to follow the existing and not modifiable constraints (inter-floor levels, external dimensions, building height, gutter shape and pitch lines) and obtaining the results required by the CasaClima directive.

SOLUTION AND COOPERATION WITH CLIVET

For the plant design, the choice was to use the innovative multifunction autonomous ELFOPack heat pump system, which simultaneously meets the heating, cooling, dehumidification, domestic hot water production requirement whilst also offering mechanical ventilation with thermodynamic recovery and air purification through electronic filtration.

This aspect played a fundamental role since these houses have a "perfect" air flow, with values of N50 = 0.50 at test conditions.

Every single flat is equipped with ELFOPack units and autonomous photovoltaic systems. The other real estate units (commercial and office buildings) are air-conditioned by direct expansion heat pump systems with external condensing unit and indoor evaporating unit and ELFOFresh air renewal and purification with active thermodynamic heat recovery unit.

The plant energy requirements are covered by the autonomous photovoltaic panels as well as the condominium utilities (two staircases with lifts) energy needs.

THE RESULTS

The building performance exceeded expectations.

The management costs are about 300€/year for each 80 square meter residential unit: heating, cooling, domestic hot water, controlled mechanical ventilation. The level of indoor comfort is based on the highest quality standards available.

The ELFOPack solution also reduced first investment costs, simplifying the installation and drastically shortening installation times.

Thanks to the heat pump technology, the management costs are tailored to the specific needs of the user, avoiding oversizing and consequent energy and running cost waste.

As far as Casaclima certification is concerned, the building obtained an A Class Certification, and also achieved the performance of a passive building (Gold Cetrification).

In particular, the buildings envelope efficiency class, thanks to the air blow and the corrected thermal bridges, is only 9 kWh/m2 while the overall efficiency of the building is 13 Kg CO2 / m2a (satisfying the parameters of the Gold directive). This result corresponds to a "almost zero energy building - nZEB" according to the European Directive 31/2010 / EU, art.2, paragraph 2.

CLIVET COMFORT SYSTEMS AT KLIMAHOUSE BOLZANO 2018

The latest news and all of the Clivet solutions for single and multifamily houses, ensuring excellent performance and low energy needs (up to nearly zero energy), will be shown at Klimahouse 2018, the Italian exhibition dedicated to the sustainable building market, which will take place in Bolzano from January 24th to 27th.

At Clivet booth B08/30 it will be possible to discover:

- Air heat pump systems (ELFOPack)

- Hydronic heat pump systems (ELFOSystem SPHERA-i Hybrid e SPHERA-T Comfort)

- Direct expansion systems including the new split lines with R32 refrigerant

- High efficiency heat pumps for domestic hot water production.

KLIMAHOUSE - Bolzano – January 24th-27th 2018, Booth B08/30