one of the cleanest
city of the world
Intense heat flow from inside
the Earth (core temperature
4000° C to 7000 °C)
Underlying Mantle, partially
A lava fountain is an example
of the amount of heat stored in
Water sweep through cracks and fissure
and comes in contact with hot rocks, may
reach a temperature of 350 ° C
The Pohutu Geyser in New
Zealand erupts with a
natural blast of the
Earth's interior heat.
Geothermal heat pumps make use of the constant temperature that
exists just under the Earth's surface.
1. Dry Steam Power Plant – produce the energy
directly from underground stream.
2. Flash Steam Power Plant – the hot water,
over 350 F, is released from the pressure and
is kept in the tank. The water is heated in the
tank and turns to stream.
3. Binary Steam Power Plant – the hot water
with 100 F is come to a heat exchanger and
mix with a secondary liquid.
• No serious pollution
• Lower maintenance cost.
• Require less area of land
• More reliable, can run 24 hours a day, 365 days a
•High cost of set up
•Antifreeze solutions are slightly toxic