Capturing Solar Energy (CIBSE Knowledge Series) by Chartered Institution of Building Services Engineers

By Chartered Institution of Building Services Engineers

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Feed-in tariffs (proposed) PV The Energy Act 2008(36) provides enabling powers for the introduction of feed-in tariffs, which it is proposed will replace the Renewables Obligation as a support mechanism to encourage small-scale electricity generation (up to 5 MW capacity) from April 2010. Feed-in tariffs will guarantee a price for a fixed period, which will reduce the payback period and increase the return on investment. Renewable Heat Incentive (RHI) (proposed) Solar thermal The Energy Act also allows for the setting up of a Renewable Heat Incentive (RHI) which it is proposed will provide financial assistance to generators of renewable heat including solar thermal systems from April 2011.

2 Design issues General design issues which need to be considered include: l l l l l l shading (as discussed in section 2, minimising shading is critical for PV arrays) avoidance of unwanted heat gains to the building or the use of heat (using the waste heat from the PV array and possibly inverters can improve the system efficiency) weathertightness windloading lifetime of components and materials (where possible this should match the lifetime of the of the PV modules which is 20–30 years) replacement of failed or damaged modules.

Performance characterisation of stores for solar heating systems BS EN 15316-4-3: 2007: Heating systems in buildings. Method for calculation of system energy requirements and system efficiencies. Heat generation systems, thermal solar systems BS EN 15316-4-6: 2007: Heating systems in buildings. Method for calculation of system energy requirements and system efficiencies. Heat generation systems, photovoltaic systems BS EN 50438: 2007: Requirements for the connection of micro-generators in parallel with public low-voltage distribution networks DD IEC/TS 61836: 2007: Solar photovoltaic energy systems.

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