Environmental Engineering Reference
In-Depth Information
Fig. 6.4
General schematic of geothermal energy reservoir. (Geothermal Energy Association Web
site, http://geo-energy.org/basics.aspx)
water which flows from natural sources, and flow paths which allow heated water
to flow back through natural fractures.
There are a range of techniques for extracting geothermal energy related to the
depths and temperature and nature of the resources involved. Figure
6.5
provides a
broad classification of underground heat utilization methods according to their ap-
proximate ranges of depth and temperature. The types of underground heat utilized
to date include geothermal heat pumps, district heating systems, and steam-based
heat and electricity generation systems. Under appropriate conditions, high-, in-
Fig. 6.5
Classification of
underground heat utilization
methods
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