Development of the Photovoltaic plant

Transcription

1 Development of the Photovoltaic plant Geographical jurisdiction ROME

2 TECHNICAL REPORT The objective of this report is to technically describe the electricity generation plant that makes use of renewable sources and the photovoltaic conservation of solar energy affecting the PAGANO structures. This document describes the plans for the development of the photovoltaic system to be installed on the rooftops of civil buildings residing within the jurisdiction of Rome s Municipality The photovoltaic plant hereby described is a grid, connected plant and has the scope of accumulating electricity which does not necessarily entail the automatic consumption of the energy, but which can in fact be stored and used when required. Generally speaking, photovoltaic technology allows to: produce electricity produces no emissions or pollutants Save fossil fuels Provide solutions for a system that is compatible with environmental and architectural conservation (e.g. visual) Install it on limited surface areas such as roofs, attics, terraces etc. The photovoltaic plant is developed as prescribed by the Ministerial Decree n 37 del 22 January 2008 The characteristics of the plant and all its components respect all current legislations and standards, in particular: those prescribed by the local authorities, including those given by the fire brigade. those prescribed by the electricity companies the Italian CEI norms The photovoltaic plants developed for the PAGANO buildings are designed for various measurement and types of structures: from the smaller homes of m 2 to bigger homes with net surface area of 1,000 2,000m 2. These plants are also placed on office buildings and industrial infrastructures that can cover a surface of up to 10,000m 2. The extent of the surface occupied by the photovoltaic modules will determine the amount of power that the plant can generate. This can vary from 5,6 kwp to a maximum of 75,5 kwp.

3 A. Example of 5,6 kwp B. Example of 75,5 kwp Net surface area of 250 m 2 Net surface area of m 2 The plant is installed on surfaces of the buildings with zero (0) inclination. Given the membrane s flat coverage a sustaining structure is located that guarantees its function remains intact throughout time, minimising its impact (avoiding to affect its water tightness through holes that would otherwise be needed to ensure it remains in place). It does not overload the loadbearing structure, and does not have a negative impact on the costs or aesthetics. This is achieved through specific assembly structures that use section bars in aluminium or zinc-plated steel, braced to concrete sheets that act as a ballast (Figure 1).

4 Figure 1 The modules are hooked onto the section bars via U brackets (these are internal, for two photovoltaic modules) or L shaped brackets (on the perimeter, for one Photovoltaic module). Based on the study made for the coverage, the photovoltaic plant s generator hereby proposed can be built from one (Example A) or two subfields (Example B). One subfield requires a generator made-up of 24 photovoltaic modules that can generate 5,6 kwp. Whilst two subfields require two composite generators: one with 248 modules and the other with 80 modules, generating a total of 75,5 kwp.

5 The photovoltaic modules are made of high efficient polycrystalline silicon with the following dimensions: H x L = 1668 x 1000 mm. Polycrystalline represents a good compromise when considering the costs, the surface area and the efficiency when compared to monocrystalline and the amorphous silicon. Example A 5,6 kwp Example B 75,5 kwp Net surface area of 250 m 2 Net surface area of m 2 The characteristics of the 230 watt module are highly competitive in terms of efficiency and costs The guarantee includes: five years for the product itself for defects and failures; 10 years for an outgoing power generation above or equal to 90% of the declared nominal power; 25 years for an outgoing power generation above or equal to 80% of the declared nominal power.

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7 TECHNICAL SHEETS FOR THE RECOMENDED PHOTOVOLTAIC PANELS

8 All the areas not used by the generator (i.e. along the perimeter and the passageways) are covered with pebbles (Figures 2 and 3). Figure 2 Figure 3

9 The connections to the inverter, that are purposely located in a technical room in the basement, does not need particular specialized attention. The technical room also hosts the distribution boards for direct and alternating current (Figure 4), whilst the panels are located adjacent to the generator and located on the roof. Figure 4

10 TECHNICAL SHEETS FOR THE RECOMMENDED INVERTERS

11 Outline of Types of Photovoltaic Plant Components found on the PAGANO structure Components located in the basement of the Structure

12 The PVGIS software is used to estimate the productivity. The software was developed by the European Commission s Joint Research Centre that provides more conservative productivity values to those given by UNI and Shading of the site is analysed via the SOLAR DIAGRAM (Figure 5) and is defined by the estimation of what the site can deliver/produce in kwh/mq (on the horizontal plane) as a monthly average. Figure 5

13 All PAGANO buildings are made in such a way as to be able to host a photovoltaic plant on their roof (Figure 6). Corrugated conduits for the electricity wires necessary for the photovoltaic modules are installed throughout the home all the way to the roof. This allows the client to purchase and have the photovoltaic plant installed by any technician, as per the specifications provided by PAGANO, at any moment of the existence of the home. Figure 6