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Photovoltaic modules convert sunlight directly into DC electricity and can be transformed into AC electricity. Photovoltaics (PVs) are distinct from other renewable energy technologies since they have no moving parts to be maintained and are silent. PV systems can be incorporated into buildings in various ways: on sloped roofs and flat roofs, in façades, atria and shading devices. PV roof tiles are now available which can be fitted in place of standard tiles.|
Currently, a PV system will cost about £4.5k per kWp. Costs have fallen significantly since the first systems were installed (1980s) and are predicted to fall further still.
While single crystal silicon remains the most efficient flat plate technology (15-16% conversion efficiency), it also has the least potential for cost reduction. PV cells made from multicrystalline silicon have become popular as they are less expensive to produce, although they have a slightly lower efficiency.
Thin film modules are constructed by depositing extremely thin layers of photosensitive materials on a low-cost backing such as glass, stainless steel or plastic. Efficiencies are much lower, around 4-5%, although this can be boosted to 8-10% by depositing two or three layers of thin film material.
In future, materials such as dye-sensitised polymers may offer very-low-cost PV materials, but the efficiency of these materials needs to be improved from their present low levels (1-2%).
For the purpose of calculating the potential of solar PV systems to contribute towards lowering the carbon emissions of a building in order for it to meet the compliance requirements of Part L of the Building Regulations, the factors to be considered are:
Future BY Energy
Future BY Energy Ltd is a professional energy assessor company with a rich understanding of the UK energy market. We offer independent professional expertise in mechanical engineering for all domestic and commercial buildings and strategic energy advice. As expert designers and specifiers of heating-cooling systems, we pride ourselves in finding affordable energy efficient solutions for new and existing buildings. We have top level experience in a wide range of building types in both commercial and domestic sectors.
As registered energy assessors we provide:
• Domestic Energy Performance Certificates (EPC)
• SAP calculation and predicted energy assessment for new built dwellings (EPC-SAP/PartL)
• SBEM calculation for Commercial buildings (SBEM/Part L)
• Commercial Energy Performance Certificates (EPC)
• Display Energy Certificates for Public buildings (DEC)
• Air Conditioning Inspections (TM44)
• Asbestos surveys and consultancy
• Air permeability-Leakage test
• Sound test and acoustic consultancy
Please do not hesitate to contact, Behdad Yazdani, on 02081440820, who will be pleased to advise you.