93084
Description
Mind Map by libby.holgate, updated more than 1 year ago
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Created by libby.holgate
over 11 years ago
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Energy efficiency
- Energy input = power(w) x time (s)
- Calculating efficiency
- to calculate efficiency
we need to know the
energy going in and the
useful energy output
- Efficiency= (useful energy/ Total energy input) x 100
- Efficiency= (useful energy/ Total energy input) x 100
- to calculate efficiency
we need to know the
energy going in and the
useful energy output
- power station efficiency
- CHP- combined heat and power
- 45% of its energy is wasted in the
cooling water. it is used to heat the
local houses. the efficiency is up to
80%
- 45% of its energy is wasted in the
cooling water. it is used to heat the
local houses. the efficiency is up to
80%
- CCGT- combined cycle gas turbines
- new gas stations have been made more efficient
by using CCGT. these use natural gas to power a
jet engine which turns a generator. then they create
steam with the exhaust gas to drive another
generator. this method is up to 55% more efficient
and can start up easily and quickly to anwer
demands for electricity rises.
- new gas stations have been made more efficient
by using CCGT. these use natural gas to power a
jet engine which turns a generator. then they create
steam with the exhaust gas to drive another
generator. this method is up to 55% more efficient
and can start up easily and quickly to anwer
demands for electricity rises.
- CHP- combined heat and power
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