Certus Cost Eff

EXAMPLES OF RENOVATION DESIGNS
PRODUCED IN THE PROJECT CERtuS

ZANCA PALACE – MESSINA ITALY

BUILDING CURRENT CONDITION – TECHNICAL AND OTHER PROBLEMS DETECTED

italy-zanca-palace
Palazzo Zanca is a courtyard-detached building, developed in an articulated platform through five pavilions. The building structure was built according to the “Hennebique” system in reinforced concrete (Portland cement). Three out of five pavilions have a continuous system of masonry in reinforced concrete, conversely, two other pavilions have a frame system with bricks, as infill wall. The external part of the envelope is in “fake stone”. All the windows are single glazed with wood frames. The structure of doors is equal to the windows, except 3 doors on the ground floor are glass and metal doors. All the windows have simple shutters. The building is shaded by other building to the North and by ever green trees to the South. The main façade oriented to the East is not subject to any shading. A thermal survey made in the building shows that walls present, generally, good thermal performance. Conversely, the windows, with single glazing and wood frames, present insulation problems, aggravated by aging. Some characteristics of the building contribute to poor thermal performance. The building presents many pathologies, such as condensation and mould growth. The HVAC is ensured with several heat pumps. The split units have more than fifteen years now, and their efficiency is reduced. The air circulation and renewal is ensured naturally, there are not systems of forced ventilation. Lighting is mainly supplied by incandescent and fluorescent lamps.

ECONOMIC, FINANCIAL AND LEGISLATIVE CONSTRAINS

BRIEF DESCRIPTION

Economic/Financial Risks
The interventions of deep renovation are still considered too risky and they do not attract the local market players. There are therefore objective difficulties for the insertion of energy improvements. Administration is trying to raise funds from national and regional funding programs.
Legislative Obstacles
Renovating the historic buildings to today’s standards through the use of renewable energy technologies and deep renovation is a difficult issue. The main objective, in these cases, is to find intelligent ways of approaching the historic building conservation and energy efficiency, without cause any visual impact or modify integrity of historical fabrics.
Palazzo Zanca is located on the seafront, at the same place of the historic town hall, which was destroyed twice before by earthquakes in 1783 and then definitively in 1908. It had been rebuilt after the earthquake of 1908 and its construction belongs to the reconstruction plans of the city. The reconstruction works began in December 1914 and were completed in 1924 The building’s style is neoclassical and consists of two floors above ground. Its dimensions are the same for each floor.All rooms are in municipal office use. The building is usually in use between 0h00 and 24h00 from Monday to Sunday, but the services are available and employees present only between 7h30 and 19h30. The building hosts about 750 employees and it is visited by an large number of visitors.

RENOVATION SCHEME

Building Envelope
Opaque Envelope: it is expected inserting a high performance plaster that improves slightly envelope performance.
Glazing: the existing glazing and frames with total U-value of 5,80 W/m2K will be replaced by selective glazing and thermal break frame in Corten steel with total U- value 1,6 W/m2K, total solar transmissions 42,1 %, light transmission 0,682.
Nighttime ventilation system: mechanical ventilation is scheduled throughout the course of the day, at night to recover the heat necessary to satisfy the values of thermal comfort of the rooms. The circulation system is integrated to the heating / cooling plant and is placed in the ceiling.
Passive solar gains: appropriate ventilation openings are located both at monumental stair windows and at main atrium, so to ensure an appropriate exchange of the air and a constant ventilation.
HVAC
The proposed HVAC systems are VRV (Ceiling-Mounted Cassette) with COP of 3.91 and EER of 3.46, according the instructions of the relevant regulations.
Lighting
All lamps of the building will be replaced with new LED lamps, after a better zoning of the fixtures. In addition, day lighting sensors will be installed on the luminaires that provides on/off switching. Also, an occupancy sensor can be connected to the daylighting sensor so that the lights can be turned ON or OFF based on light levels and occupancy detection.
RES
A PV system of 61 kWp will be installed on the roof of the building. This value ensures just over 40% of the current electricity consumption. The panels will be placed nearly due South with a fixes slop of 30% and azimuth of 0°.
Other
Energy management system: A Building Automation Control System (BACS) to optimise the building’s mechanical and electrical equipment will be installed
GENERAL INFORMATION
Year of construction:
1914
Area/Volume:
13.500 m2 (about 7.000 m2 to floor) / 95.000 m3 .
Building Use :
City hall/ multiple functions of public utility
supp_zanca LEARN MORE:
Link to D2.1 pdf
Link to D2.3 pdf

Link to Guide or Brochure
Certus Cost Eff

EXAMPLES OF RENOVATION DESIGNS
PRODUCED IN THE PROJECT CERtuS

ZANCA PALACE – MESSINA ITALY

RENOVATION SCHEME EVALUATION

Energy Savings
The energy consumption before renovation is equal to 1,306,563 kWh/year and the energy consumption on square meter is equal to 97 kWh/m2. The energy consumption savings are equal to 774,308 kWh/year, that means an energy expenditure saving of 139,375 Euro/year.
CO2 Savings
The CO2 savings are 277,098 tons/year.
RES Integration
 The installation of a 126kWp PV system for energy  generation is expected to produce about 176,400 kWh/y.   
PARAMETERS OF THE RENOVATION SCHEME- TOTAL

Energy Savings 774,308 kWh
Costs 2,309,752 €
Potential Savings from maintenance (post intervention) 216.995 €/year
Simple Payback 11 years
CO2 Savings 277,098 tons /year
ECONOMIC EVALUATION

Renovations cost
The total investment cost is equal to 2,309,752 Euro, that means an investment cost per square meter of 171,09Euro/m2.
Economic Savings
The energy expenditure saving is 139,375 Euro/year. The maintenance expenditure post renovation is lower than before of 77,620 Euro/year. This situation affects positively, at economic level, on the total savings achievable by the intervention, in fact the economic saving both energy and maintenance is about 216,995 Euro/year.

Project Payback Period
The Project Payback period is 11 years considering the maintenance savings but the cash flows are not sufficient to implement a financial structure at market condition. The duration of the EPC contract is higher than the normal market condition (normally 15 years maximum). This duration is due to the fact that the project has a long payback period.

INVESTMENT FOR RENOVATION – TOTAL

INVESTMENTS
HVAC 700,000
Lighting system (internal+external) 321,000
Renewable energy 226,800
Windows – Low e Thermo Break 817,600
False celings 244,352
Investment for Renovation 2,309,752
FINANCING SCHEME
Energy Performance Contract
The strategy of Messina’s Municipality is to promote the nZEB concept, despite its inability to financing the needed renovation options under the current tight economic conditions.  Dealing with the expensive renovation of Zanca Palace, the most suitable operational financial scheme corresponds to a solution which combines the use of three types of public/private partnerships EPC contracts, with provision of specific conditions, in order to make the project attractive for the ESCo market.To make it palatable to the market projects and allow a contract term not exceeding nine years is necessary: (i)  reduce the investment value postponing interventions that bring lower energy benefits (see. adjacent Table);  (ii)  a contribution from the Municipality on investment of 30%;  (iii)  recourse to financing with concessional funds or use of incentives of the Energy Bill.  In this way, the investment is reduced by about € 800,000, the pay-back of the project for the ESCO is greatly reduced.

Duration of EPC
In accordance with the measure of separated investments, the contract duration is of 9 years with an IRR for an ESCO equal to 5,5.
Financial Sources
The Municipality can directly finance part of the renovation measures through the National Operational Programme on Italian Metropolitan Cities for an amount of 450 k€ that corresponds to approximately 30% of the total investment of the building renovations.  The remaining cost will be funded by an ESCO through the ‘Conto Termico 2’ and own resources as well by subsidized and dedicated funds (national and European).
Other considerations
The total investment of the municipality for the three projects would amount to about 2,000 k€ which would be fully covered by the National Operational Programme on Italian Metropolitan Cities, any other remaining funds would allow to directly realize the deferred works.

 

SEPARATED INVESTMENTS COST € SAVING €
Windows– Low-e /thermal break 817.600 5.980
supp_zanca LEARN MORE:
Link to D2.5 pdf

Link to D3.6 pdf
Link to D3.7 pdf