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• 1. [Image] Thermal Fracture Effects in Geothermal Energy Extraction

  	Heat and water exchange between the primary crack and a lateral thermal fracture are analyzed by means of numerical modeling on a high-speed computer. Three-dimensional heat flow in the rock is coupled ...
  	Citation × Citation Citation Abstract Copy Title: Thermal Fracture Effects in Geothermal Energy Extraction Author: Demuth, R.B. Year: 1979 Heat and water exchange between the primary crack and a lateral thermal fracture are analyzed by means of numerical modeling on a high-speed computer. Three-dimensional heat flow in the rock is coupled to a two-dimensional approximation for the time-varying convective patterns that result from both forced flow and buoyancy. The physical and mathematical bases for the study are described together with the numerical technique for solution. The report includes listing of three versions of the computer code and some results of representative calculations Title: Thermal Fracture Effects in Geothermal Energy Extraction Author: Demuth, R.B. Year: 1979 Heat and water exchange between the primary crack and a lateral thermal fracture are analyzed by means of numerical modeling on a high-speed computer. Three-dimensional heat flow in the rock is coupled to a two-dimensional approximation for the time-varying convective patterns that result from both forced flow and buoyancy. The physical and mathematical bases for the study are described together with the numerical technique for solution. The report includes listing of three versions of the computer code and some results of representative calculations Close

• 2. [Image] Geothermal energy enhancement by thermal fracture. [REX (Rock Energy Extraction)]

  	A large, vertical, circular fracture created deep within hot rock is connected to the surface through two holes. The inlet provides a source of cold water and the outlet extracts heated water. Cooling ...
  	Citation × Citation Citation Abstract Copy Title: Geothermal energy enhancement by thermal fracture. [REX (Rock Energy Extraction)] Author: Demuth, R.B. Year: 1980 A large, vertical, circular fracture created deep within hot rock is connected to the surface through two holes. The inlet provides a source of cold water and the outlet extracts heated water. Cooling of the rock produces thermal stresses that fracture the rock adjacent to the primary crack, thereby enhancing the heat extraction rate by means of convective transport. The properties of the thermal fracture network vary with position and time. The REX code for high-speed computer was written and used to study the coupled processes of primary-crack flow and lateral thermal fracture heat transport. Calculations for elapsed times of 100 y show that thermal fracture enhancement can double the heat extraction rate over the results from conduction alone. Long-term enhancement predictions depend on data from rock-mechanics studies, which the REX code is prepared to accept as they become available.; LA-8428 Title: Geothermal energy enhancement by thermal fracture. [REX (Rock Energy Extraction)] Author: Demuth, R.B. Year: 1980 A large, vertical, circular fracture created deep within hot rock is connected to the surface through two holes. The inlet provides a source of cold water and the outlet extracts heated water. Cooling of the rock produces thermal stresses that fracture the rock adjacent to the primary crack, thereby enhancing the heat extraction rate by means of convective transport. The properties of the thermal fracture network vary with position and time. The REX code for high-speed computer was written and used to study the coupled processes of primary-crack flow and lateral thermal fracture heat transport. Calculations for elapsed times of 100 y show that thermal fracture enhancement can double the heat extraction rate over the results from conduction alone. Long-term enhancement predictions depend on data from rock-mechanics studies, which the REX code is prepared to accept as they become available.; LA-8428 Close