Read e-book online An introduction to thermogeology: ground source heating and PDF

By David Banks

ISBN-10: 1405170611

ISBN-13: 9781405170611

Using the warmth kept within the shallow subsurface for area heating (ground resource warmth) is normal in North the United States and plenty of eu international locations, resembling Sweden, and is considered an important and trustworthy 'green' house heating expertise. in lots of countries, together with Britain, the know-how is still poorly understood and below used. this case is set to alter, besides the fact that, with the united kingdom marketplace for floor resource warmth pumps growing to be at over a hundred% every year. This publication deals sensible suggestions and should equip engineers, planners and geologists with the basic talents to evaluate and enforce this new expertise and to introduce them to the technological know-how at the back of thermogeology.

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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). While the geothermal borehole now only provides around 10–20% of the total peak heating load supplied by the integrated scheme, the scheme’s total impact is impressive, with an annual carbon dioxide emission saving of at least 10 000 tonnes, compared with conventional technologies (Energie-Cités, 2001; EST, 2005).

In systems producing mixtures of water and steam or wet steam, a separator may be required to remove the water component from the steam. The efficiency of the turbine can be improved by using a condensing unit to condense the steam following passage through the turbine. 9 Binary systems At lower temperatures, it is still possible to generate electricity from geothermal fluids. Here, however, we may not be able to use steam directly as the working fluid. We must use a heat exchanger to transfer heat energy to a secondary fluid that has a lower temperature of vaporisation (boiling point), such as n-pentane or butane (Boyle, 2004).

1 Conduction Heat conduction describes the process by which heat diffuses through a solid, liquid or gas by processes of molecular interaction. Put crudely, if we warm up one end of a chunk of granite, the molecules at that end start vibrating more strongly. These vibrating atoms or molecules cause their neighbours to start vibrating as well, such that the heat energy (and temperature) gradually diffuses throughout the piece of rock. 1. The thermal conductivity describes how good the medium is at conducting heat: copper is very good, rocks are less good and plastics are generally poor.

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An introduction to thermogeology: ground source heating and cooling by David Banks


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