EXAMPLES OF RENOVATION DESIGNS
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ZANCA PALACE – MESSINA ITALY |
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BUILDING CURRENT CONDITION – TECHNICAL AND OTHER PROBLEMS DETECTED |
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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 |
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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 |
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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 | |
LEARN MORE: Link to D2.1 pdf Link to D2.3 pdf Link to Guide or Brochure |
EXAMPLES OF RENOVATION DESIGNS
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ZANCA PALACE – MESSINA ITALY |
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RENOVATION SCHEME EVALUATION |
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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
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ECONOMIC EVALUATION | |||||||||||||||
Renovations cost Project Payback Period |
INVESTMENT FOR RENOVATION – TOTAL
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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 |
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LEARN MORE: Link to D2.5 pdf Link to D3.6 pdf Link to D3.7 pdf |