RLB_UK_Riders_Digest_2013

Conventional
electricity
generation from
large scale power
stations is very
inefficient as only
a small part of
the input energy
is converted to
electricity (typically
25–35%), with the
remainder lost via
cooling towers
as waste heat at
the power station and transmission line losses to the point of
use.
A typical CHP system conventionally comprises:
1. a diesel or gas turbine engine
2. a generator (alternator)
3. heat recovery jackets on the engine carcass and exhaust
system
4. metering, control and distribution systems for the
generated heat and electrical power.
Heat can also be used to provide cooling via absorption
chillers. CHP is applicable on a variety of scales, from citywide
development down to individual buildings. Steady heat
and power loads will improve the economics of CHP and so
systems should be designed to allow a suitably sized engine
to run at or near maximum capacity for as much of the day
as possible
Micro-CHP refers to small scale CHP, which is most
commonly used for individual buildings. Units are becoming
smaller and quieter and have the potential to be used in
place of traditional boilers within homes.
Reduction of CO2 emissions
Reduced capital costs if funded by an ESCo
Energy cost savings
“Good quality” CHP qualifies for climate levy exemption
Can be considered as ‘clean energy’ qualifying for enhanced
capital allowances
Contribution toward compliance with building and renewable
energy regulations and can be powered using biofuels
Generating at point of use negates transmission losses
Reduced dependency on electricity supplier
An alternative to purchasing new or additional boiler
© Rider Levett Bucknall UK 2013
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