By David Banks
Using the warmth saved within the shallow subsurface for house heating (ground resource warmth) is typical in North the USA and plenty of ecu countries, akin to Sweden, and is thought of as crucial and trustworthy 'green' house heating expertise. in lots of countries, together with Britain, the expertise continues to be poorly understood and less than used. this case is ready to alter, notwithstanding, with the united kingdom marketplace for flooring resource warmth pumps turning out to be at over a hundred% every year. This booklet deals functional suggestions and should equip engineers, planners and geologists with the elemental 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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Additional resources for An introduction to thermogeology: ground source heating and cooling
1 Water- and vapour-dominated geothermal systems The ﬂuid produced by wells drilled into water-dominated systems is mostly liquid water as the pressure-controlling phase, with some steam present, for example, as bubbles. The temperatures of these systems may be well above 100◦ C – remember that water only boils at 100◦ C at 1 atm pressure. In subsurface pressure conditions, water can exist as a liquid at much higher temperatures, only boiling (‘ﬂashing’) when pressure is released during transit to or on arrival at the surface.
Figures are cited as kWh m−2 day−1 (and W m−2 ).
Furthermore, fossil fuel boilers can be activated to support the peak heating load of the scheme (which is around 12 MWt ). Heat pumps are also used to support a separate insulated network of pipes supplying customers with chilled water for air-conditioning. Cooling needs have increased dramatically since the system’s conception to such a level that it is planned, during summer months, to use nighttime electricity to produce ice by means of heat pumps. This ice will then be used to provide chilled water during daytime – a simple but elegant means of storing ‘coolth’ produced at times of surplus electrical capacity (Energie-Cités, 2001).
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