Demo site 3. Lecce, Italy

/Demo site 3. Lecce, Italy
Demo site 3. Lecce, Italy 2017-11-07T12:02:25+00:00

Name: “Caiaffa” Building
Location: Viale De Pietro, Lecce, Italy
Status: In operation and monitoring since January 2016

Surface: 5.214 m2
Building use/type: Offices and commercial area
Climatic zone: Mediterranean

The Italian pilot is located in Lecce, in a central and strategic part of the city, few meters far from the historic center and in front of a recreation point for students. The project consists in a mixed use building composed by four floors over ground and three floors underground; the lower floors host the first underground parking in Lecce, with space for 661 cars in total; the first floor underground and the ground floor are addressed to shops and commercial spaces. This commercial area distributed i has a total surface of 578 m2. Upper floors are office spaces with a total surface of 400 m2. The terrace can be reached through three stairs and three elevators; it is totally covered by a covering, on which the PV panels are installed.

One of the main concerns in NEED4B is reducing cooling demand in those buildings situated in the Mediterranean area. This demo site located in the South of Italy provides the opportunity to face this topic and provide an example of best practice in terms of energy efficiency during the warm seasons.

Lecce is one of the most touristic cities in the south of Italy. The urban area where the Pilot is located has a big historical and architectonical value and it is currently under refurbishment. This enhances the visibility of the zone, where tradition meets innovation and both the new building and the retrofitted ones represent the icons of energy efficient technology and research.

The building has a high replication potential since it represents a high energy efficiency building with structural and technical characteristics which can be easily transferred and adapted to different built environment contexts. In this case, the new building aims to be perfectly integrated in an historic district, but its structural and technical aspects might be reproduced also in a new development area of the city.

> Demo site team: DIRCO, DAPPO

DIRCO s.r.l is the developer of the Caiaffa building and is involved in its design, development and commissioning. D´Appolonia is the engineering firm coordinating the demo site activities in NEED4B; supports DIRCO in the building design and implementation and is responsible for the monitoring and validation of the building performance.

> Building process and schedule:

The construction of the Caiaffa building was finalized in October 2014. Monitoring works started in January 2016 when the building was occupied by the users.

> Main technologies and solutions

  • Façade. The building envelope integrates advanced insulation, double skin coating, and high performance glazing. The glazing façade has high performance insulated glasses “Climax 5+5/20gas/4+4”, with accident prevention double layer (internal and external) and low-emission treatment in order to guarantee minimum energy consumption.
  • Structure and Insulation: The main frame is made of steel reinforced concrete. External wall insulation from the internal to the external sides is composed of:

i. Plasterboard coating made of two plasterboard panels having a thickness of 12.5 mm each, placed on metal frames anchored to floor and ceiling.
ii. 7 cm of tuff layer;
iii. 26 cm of concrete;
iv. 17 cm Lecce stone. A calcareous stone dating back to the Miocene period (21 million years ago). Its unique compactness, color and structure are the results of its components. The U-value of Lecce stone is 1,700 W/m °C.

  • Windows: Two types of glasses (transparent and opaque) have been installed in the windows of the building: In the commercial area, the installed glasses are characterized by U-value = 1,1 W/m2 K and G-value = 0,46. In the offices, there are glasses with U-value = 1,1 W/m2 K and G-value = 0,36.
  • Heat pumps: High efficiency heat pumps (COP 4 for heating and COP 3.5 for cooling) are mounted on the terrace. Each outdoor unit is connected to the internal units mounted in the suspended ceiling (commercial area) or on the wall (office) by insulated copper refrigerant piping.
  • Air conditioning system [commercial area]: indoor units installed in the suspended ceiling, with four-way distribution, and variable capacity refrigerant, according the VRF system characterized by nominal capacity equal to 3.6 kW in cooling mode, and to 4.0 kW in heating mode. For the commercial area, 50 internal units connected to 4 external units have been installed. For the third floor with offices, there are indoor units with variable capacity refrigerant, according the VRF system characterized by nominal capacity equal to 2.2 kW in cooling mode, and to 2.5 kW in heating mode. 33 external units and 153 internal units have been installed.
  • PV installation: The photovoltaic plant has a total power of 83.09 kWp and is composed by 334 photovoltaic panels in polycrystalline silicon. In particular, 252 PV panels (BenQ mod. EcoDuo 250W) have a power of 250 Wp, and 82 PV panels (Conergy mod. EcoPro 245P) have a power of 245 Wp.
  • Monitoring system: The monitoring system includes the installation of energy meters for electricity consumption, electricity counters, concentrators, and a management and control software. Climatic parameters and DHW production is also measured.

The energy demand of the Lecce demo site is exclusively supplied by electrical energy sources. Thus, the electricity consumption (heating, lighting and equipment) and the energy produced by the photovoltaic system are monitored for the whole building. Also, room temperature and relative humidity and the domestic hot water consumption are monitored in some areas of the building.

Building performance and savings

Energy consumption values are expressed in terms of primary energy. Different conversion factors have been applied according to national or European standards:

Primary energy consumption

Breakdown of Energy Consumption in the building by type of measure (kWh/m2 year):

Heating Cooling Lighting Ventilation Domestic
Hot Water
13,11 25,42 2.09 0,74 41,36


Renewable Energy Sources Contribution (kWh/m2 year)