By David Banks
Using the warmth kept within the shallow subsurface for area heating (ground resource warmth) is typical in North the USA and plenty of eu international locations, corresponding to Sweden, and is considered crucial and trustworthy 'green' area heating expertise. in lots of international locations, together with Britain, the expertise continues to be poorly understood and less than used. this case is ready to alter, even if, with the united kingdom marketplace for flooring resource warmth pumps becoming at over a hundred% every year. This booklet deals useful counsel and may equip engineers, planners and geologists with the basic talents to evaluate and enforce this new know-how and to introduce them to the technology at the back of thermogeology.
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Extra info for An introduction to thermogeology: ground source heating and cooling
Such a nation may therefore be able to indeﬁnitely sustain a national energy policy founded on geothermal energy, via a sound understanding and holistic planning of its resources of heat and geothermal ﬂuids. In the discussion above, we have deﬁned ‘sustainability’ rather narrowly and constrained it to discussions of whether production of ﬂuids and heat can be maintained over protracted periods. In popular perception, the discussion of sustainability is bound with the concept of pollution and environmental impact.
One of the classic deﬁnitions of sustainability is that of Gro Harlem Brundtland’s commission: sustainable development meets the needs of the present without compromising the ability of future generations to GSHC: “gshc_02” — 2008/1/28 — 18:38 — page 28 — #21 Geothermal Energy 29 meet their own needs. Stefansson and Axelsson (2003) offer a more complex deﬁnition, tailored to geothermal exploitation: For each geothermal system, and for each mode of production, there exists a certain level of maximum energy production, E0 , below which it will be possible to maintain constant energy production from the system for a very long time (100–300 years).
3 The Southampton geothermal system. 7 (p. 51) reveals that the city of Southampton, on the English south coast, is not associated with any especially high geothermal heat ﬂux. The fact that it is England’s ﬁrst and most famous functional geothermal heating system demonstrates that one does not necessarily require extraordinary geological conditions – one merely needs • a thick sedimentary sequence of relatively low thermal conductivity (and thus high geothermal gradient), such that elevated temperatures are found at modest depth; • an aquifer horizon at that depth.
An introduction to thermogeology: ground source heating and cooling by David Banks