Construction

# Combined heat and power for buildings by Ashrae

By Ashrae

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Extra resources for Combined heat and power for buildings

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E. the chp is tending to become the equivalent of a boiler. So the most efficient chp is where the electrical efficiency is as high as possible. 1 shows how the equivalent heat efficiency varies with chp electrical efficiency for three different grid efficiencies (40%, 45% and 50%) and for a total chp efficiency (thermal plus electrical) constant at 80% in all cases. 1 shows that the equivalent heat efficiency increases as the chp electrical efficiency increases. The increase is significant; for the 40% grid efficiency case the chp equivalent heat efficiency increases from 200% to 360% for an increase in electrical efficiency from 30% to 35%.

2 demonstrates that the key issue in the comparison is the emission factor assumed for the grid electricity. As the electricity supply is composed of a mix of power stations with wide variation in emissions factor (from hydroelectricity and wind energy with near zero emissions to coal-fired power stations with around 900 g/kW·he), it is not obvious which emissions factor to use. An average emissions factor is the approach taken within Part L of the Building Regulations 2010 (DCLG, 2010) where 529 g/kW·he is to be used in assessing the benefits from displacing grid electricity.

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