Production Capacity of Geothermal Systems

Jump to: navigation, search


OpenEI Reference LibraryAdd to library

Conference Paper: Production Capacity of Geothermal Systems

Abstract
Geothermal systems are classified on the basis of reservoir temperature, reservoir enthalpy, their physical state or their nature and geological setting. They are often classified as either high-temperature (reservoir temperature a 1 km depth above 200°C) or low-temperature (reservoir temperature a 1 km depth below 150°C). Geothermal systems are also classified as (a) volcanic systems with the heat sources being hot intrusions or magma, (b) convective systems with deep water circulation in tectonically active areas, (c) sedimentary systems with permeable layers at great depth, (d) geo-pressured systems, (e) hot dry rock or enhanced geothermal systems and (f) shallow resources utilized through ground-source heat pump application. Low-temperature resources are distributed throughout the world; they are not restricted to volcanic regions. They are suitable for various direct applications, in particular space-heating. Even though geothermal resources are considered renewable their production capacity is not unlimited. It is predomi-nantly controlled by the reservoir pressure decline caused by the hot water production. This is in turn determined by the size of a geothermal reservoir, its permeability, reservoir storage capacity, water recharge and geological structure. Geothermal systems can in most cases be classified as either closed, with limited or no recharge, or open, where recharge equilibrates with the mass extraction. Volumetric assessment and dynamic modelling are the main methods of estimating the production capacity of geothermal reservoirs. Simple analytical models, lumped parameter models and detailed numerical models are used to simulate the nature and production response of geothermal systems as well as to calculate future predictions.

Author 
Gudni Axelsson






Conference 
Workshop for Decision Makers on the Direct Heating Use of Geothermal Resources in Asia; Tianjin, China; 2008/05/11


Published 
United Nations University Geothermal Training Programme, 2008





DOI 
Not Provided
Check for DOI availability: http://crossref.org


Online 
Internet link for Production Capacity of Geothermal Systems

Citation

Gudni Axelsson. 2008. Production Capacity of Geothermal Systems. In: Proceedings of the Workshop for Decision Makers on the Direct Heating Use of Geothermal Resources in Asia. Workshop for Decision Makers on the Direct Heating Use of Geothermal Resources in Asia; 2008/05/11; Tianjin, China. Tianjin, China: United Nations University Geothermal Training Programme; p. 14