Presentation on theme: "A Roofers Guide to Sustainability YIRTG is pleased to acknowledge that the Roofers Guide to Sustainability Modular Programme was developed with funding."— Presentation transcript:
A Roofers Guide to Sustainability YIRTG is pleased to acknowledge that the Roofers Guide to Sustainability Modular Programme was developed with funding from CITB ConstructionSkills as part of their long term commitment to training and quality standards in the specialist roofing sector. This support is gratefully appreciated Sustainable Roofing Solutions
The Plan Sign Attendance Register Complete Activity Aims Presentation Activity Review
Course Aims To provide an overview of solar products To explain the types of Green roofs and their benefit to the environment
Activity How many types of Solar Products can you name?
Photovoltaic The term "photovoltaic" comes from the Greek meaning "light", and from "Volt
How a crystalline PV cell is produced Silica sand.Silica is heated in a furnace with carbon to produce silicon. The silicon is then further treated to 99.99% purity. The purified silicon is then made into ingots. The ingots are sliced into wafers 200 – 300 microns thick.
The sliced wafers are doped to create a positive and a negative sided cell. The cell is then cut as square as possible and thin metallic contacts printed on both sides. Several cells are connected together and laminated between glass and a rear substrate to create a solar panel. How a crystalline PV cell is produced
There are two types of wafer photovoltaic cells: Monocrystalline : Single cylindrical crystal ingot, drawn from a bath of liquid silicon. The ingot is trimmed to produce a nearly square cross section, prior to being cut into wafers. In good light conditions, monocrystalline is the most efficient of all current PV technologies. Types of crystalline PV cells
Polycrystalline: Offcuts and breakages are recovered from other parts of the production process. These are recycled by melting, and cooling them into a block. This is then cut into wafers, and since it is rectangular in section, there is no futher wastage. Polycrystalline cells are typically less efficient than monocrystalline ones. Due to polycrystalline cells being truly square though, they can be cut without any wasted material. This means that modules produced from both cell types tend to have similar power yields. Types of crystalline PV cells
Amorphous Thin Film Thin Film is produced when amorphous silicon is deposited on a backing substrate Tis reduces the amount of silicon required to make the cells and reduces the cost of thin film technology compared to alternatives Thin film is a good alternative where weight restrictions limit the use of other technologies or as a cheaper alternative for a larger area.
The Yorkshire Independent Roof Training Group is pleased to acknowledge that the Roofers Guide to Sustainability is delivered as a result of funding provided by CITB ConstructionSkills as part of their long term commitment to training and quality standards in the specialist roofing sector. This support is gratefully appreciated