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in creator/contributor: "Mines, G.L."

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Design Considerations for Artificial Lifting of Enhanced Geothermal System Fluids

This work evaluates the effect of production well pumping requirements on power generation. The amount of work that can be extracted from a geothermal fluid and the rate at which this work is converted to power increase as the reservoir temperature increases. Artificial lifting is an important issue in this process. The results presented are based on a configuration comprising one production well and one injection well, representing an enhanced geothermal system. The effects of the hydraulic co… more

Date: July 1, 2005

Creator: Xie, Xina; Bloomfield, K. K.; Mines, G. L. & Shook, G. M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Parametric Sensitivity Study of Operating and Design Variables in Wellbore Heat Exchangers

This report documents the results of an extensive sensitivity study conducted by the Idaho National Engineering and Environmental Laboratory. This study investigated the effects of various operating and design parameters on wellbore heat exchanger performance to determine conditions for optimal thermal energy extraction and evaluate the potential for using a wellbore heat exchanger model for power generation. Variables studied included operational parameters such as circulation rates, wellbore … more

Date: May 1, 2004

Creator: Nalla, G.; Shook, G.M.; Mines, G.L. & Bloomfield, K.K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Evaluation of the Impact of Off-Design Operation on an Air-Cooled Binary Power Plant

Geothermal power plants are designed and constructed to provide a rated power output at specific resource and ambient conditions. Due to both diurnal and seasonal changes in the ambient air temperature, as well as a decline in resource productivity over time, plants seldom operate at these ''design'' conditions. This paper examines the impact of ''off- design'' operation of an air-cooled binary geothermal power plant. An available energy analysis is used to evaluate operation at these condition… more

Date: June 17, 2002

Creator: Mines, G.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Summary of investigations of the use of modified turbine inlet conditions in a binary power plant

Investigators at the Idaho National Engineering and Environmental Laboratory (INEEL) are developing technologies that will enhance the feasibility of generating electrical power from a hydrothermal resource. One of the concepts investigated is the use of modified inlet conditions in geothermal binary power plant turbines to increase the power generation. An inlet condition of interest allows the expanding vapor to enter the two-phase region, a mode of operation typically avoided because of conc… more

Date: September 24, 2000

Creator: Mines, G. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Operation of Mammoth Pacific`s MP1-100 turbine with metastable, supersaturated expansions

INEL`s Heat Cycle Research project continues to develop a technology base for increasing use of moderate-temperature hydrothermal resources to generate electrical power. One concept is the use of metastable, supersaturated turbine expansions. These expansions support a supersaturated working fluid vapor; at equilibrium conditions, liquid condensate would be present during the turbine expansion process. Studies suggest that if these expansions do not adversely affect the turbine performance, up … more

Date: January 1, 1996

Creator: Mines, G.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Field investigations examining the impact of supersaturated vapor expansions on turbine performance

Investigators in the Heat Cycle Research project are developing a technology base which will permit the increased utilization of the moderate-temperature, liquid-dominated geothermal resource for the production of electrical power. The project investigations have focused upon power cycles which have the potential for the increased utilization (power produced per unit quantity of fluid) of the hydrothermal resource. The investigations to date have confirmed the viability of technology required t… more

Date: January 1, 1995

Creator: Mines, G. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Supersaturated Turbine Expansions for Binary Geothermal Power Plants

The Heat Cycle Research project is developing the technology base that will permit a much greater utilization of the moderate-temperature, liquid-dominated geothermal resources, particularly for the generation of electrical power. The emphasis in the project has been the improvement of the performance of binary power cycles. The investigations have been examining concepts projected to improve the brine utilization by 20% relative to a ''Heber-type'' binary plant; these investigations are nearin… more

Date: March 24, 1992

Creator: Bliem, C.J. & Mines, G.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Advanced binary geothermal power plants: Limits of performance

The Heat Cycle Research Program is investigating potential improvements to power cycles utilizing moderate temperature geothermal resources to produce electrical power. Investigations have specifically examined Rankine cycle binary power systems. Binary Rankine cycles are more efficient than the flash steam cycles at moderate resource temperature, achieving a higher net brine effectiveness. At resource conditions similar to those at the Heber binary plant, it has been shown that mixtures of sat… more

Date: January 1, 1991

Creator: Bliem, C.J. & Mines, G.L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Overview of the Heat Cycle Research project

The Heat Cycle Research project is developing the technology base that will permit a much greater utilization of the moderate- temperature, liquid-dominated geothermal resources, particularly for the generation of electrical power. The emphasis in the project has been the improvement of the performance of binary power cycles. The investigations have been examining concepts projected to improve the brine utilization by 20% relative to a Heber-type'' binary plant; these investigations are nearing… more

Date: January 1, 1991

Creator: Bliem, C.J. & Mines, G.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Advanced binary geothermal power plants: Limits of performance

The Heat Cycle Research Program is currently investigating the potential improvements to power cycles utilizing moderate temperature geothermal resources to produce electrical power. Investigations have specifically examined Rankine cycle binary power systems. Binary Rankine cycles are more efficient than the flash steam cycles at moderate resource temperatures, achieving a higher net brine effectiveness. At resource conditions similar to those at the Heber binary plant, it has been shown that … more

Date: January 1, 1990

Creator: Bliem, C.J. & Mines, G.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Second law analysis of advanced power generation systems using variable temperature heat sources

Many systems produce power using variable temperature (sensible) heat sources. The Heat Cycle Research Program is currently investigating the potential improvements to such power cycles utilizing moderate temperature geothermal resources to produce electrical power. It has been shown that mixtures of saturated hydrocarbons (alkanes) or halogenated hydrocarbons operating with a supercritical Rankine cycle gave improved performance over boiling Rankine cycles with the pure working fluids for typi… more

Date: January 1, 1990

Creator: Bliem, C.J. & Mines, G.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Supercritical binary geothermal cycle experiments with mixed-hydrocarbon working fluids and a near-horizontal in-tube condenser

The Heat Cycle Research Program, which is being conducted for the Department of Energy, has as its objective the development of the technology for effecting improved utilization of moderate temperature geothermal resources. Testing at the Heat Cycle Research Facility which was located at the DOE Geothermal Test Facility, East Mesa, California is presently being conducted to meet this objective. The testing effort discussed in this interim report involves a supercritical vaporization and counter… more

Date: December 1, 1989

Creator: Bliem, C.J. & Mines, G.L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Advanced Binary Geothermal Power Plancts Working Fluid Property Determination and Heat Exchanger Design

The performance of binary geothermal power plants can be improved through the proper choice of a working fluid, and optimization of component designs and operating conditions. This paper reviews the investigations at the Idaho National Engineering Laboratory (INEL) which are examining binary cycle performance improvements: for moderate temperature (350 to 400 F) resources with emphasis on how the improvements may be integrated into design of binary cycles. These investigations are examining per… more

Date: March 21, 1989

Creator: Bliem, C.J. & Mines, G.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Advanced binary geothermal power plants working fluid property determination and heat exchanger design

The performance of binary geothermal power plants can be improved through the proper choice of a working fluid, and optimization of component designs and operating conditions. This paper reviews the investigations at the Idaho National Engineering Laboratory (INEL) which are examining binary cycle performance improvements for moderate temperature (350 to 400 F) resources with emphasis on how the improvements may be integrated into design of binary cycles. These investigations are examining perf… more

Date: January 1, 1989

Creator: Bliem, C.J. & Mines, G.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Relative performance of supercritical binary geothermal power cycles with in-tube condensors in different orientations

The Heat Cycle Research Program, which is conducted for the Department of Energy, has as its objective the development of the technology for effecting the improved utilization of moderate temperature geothermal resources. The current testing involves the investigation of the performance of binary power cycles utilizing mixtures of non-adjacent hydrocarbons as the working fluids, with supercritical vaporization and in-tube condensation. The utilization of these concepts will improve the net geof… more

Date: January 1, 1989

Creator: Bliem, C.J. & Mines, G.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Simple strategies for minimization of cooling water usage in binary power plants

The geothermal resources which could be used for the production of electrical power in the United States are located for the most part in the semi-arid western regions of the country. The availability of ground or surface water in the quantity or quality desired for a conventional wet'' heat rejections system represents a barrier to the development of these resources with the binary cycle technology. This paper investigates some simple strategies to minimize the cooling water usage of binary po… more

Date: January 1, 1989

Creator: Bliem, C.J. & Mines, G.L. (EG and G Idaho, Inc., Idaho Falls, ID (USA))

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Geothermal heat cycle research supercritical cycle with counterflow condenser in different orientations

The Heat Cycle Research Program, which is conducted for the Department of Energy, has as its objective the development of the technology for effecting the improved utilization of moderate temperature geothermal resources. The current testing involves the investigation of binary power cycle performance utilizing mixtures of non-adjacent hydrocarbons as the working fluids, with supercritical vaporization and in-tube condensation of the working fluid. The utilization of these concepts verified her… more

Date: January 1, 1988

Creator: Bliem, C.J. & Mines, G.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Improving the efficiency of binary cycles

The performance of binary geothermal power plants can be improved through the proper choice of a working fluid, and optimization of component designs and operating conditions. This paper summarizes the investigations at the Idaho National Engineering Laboratory (INEL) which are examining binary cycle performance improvements for moderate temperature (350 to 400 F) resources. These investigations examine performance improvements resulting from the supercritical vaporization and countercurrent in… more

Date: January 1, 1988

Creator: Mines, G.L. & Bliem, C.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Analysis of the heat transfer to hydrocarbon mixtures from geothermal brines using a sieve tray column

In order to design geothermal direct contact binary cycle power plants it is necessary to develop design tools to size the direct contactor. Of particular importance is the design of the working fluid preheater. For sieve tray columns a method is presented which has been successfully used when the working fluid is a pure fluid. It is shown here to be equally successful when applied to fluid mixtures. Further, it is shown that when changing the working fluid mixture that column internals must be… more

Date: January 1, 1987

Creator: Jacobs, H. R.; Eden, T. J.; Mines, G. L. & Demuth, O. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Geothermal heat cycle research: Supercritical cycle with horizontal counterflow condenser

The Heat Cycle Research Program, which is being conducted for the Department of Energy, has as its objective the development of the technology for effecting the improved utilization of moderate temperature geothermal resources. To meet this objective, the program has as one of its goals to improve the performance of geothermal binary cycles to levels approaching the practicable thermodynamic maximum. In pursuit of this goal, tests are being conducted at the Heat Cycle Research Facility located … more

Date: January 1, 1987

Creator: Mines, G.L.; Swank, W.D. & Bliem, C.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Overview of recent activities in the Heat Cycle Research Program

Date: January 1, 1987

Creator: Bliem, C.J. & Mines, G.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Overview of recent supercritical binary geothermal cycle experiments from the Heat Cycle Research Program

The Heat Cycle Research Program, which is being conducted for the Department of Energy, has as its objective the development of the technology for effecting improved utilization of moderate temperature geothermal resources. Testing at the Heat Cycle Research Facility located at the DOE Geothermal Test Facility East Mesa, California involves supercritical vaporization and counterflow in-tube condensing in an organic Rankine cycle. Results of the experiments are given for both pure and mixed-hydr… more

Date: January 1, 1986

Creator: Demuth, O.J.; Bliem, C.J.; Mines, G.L. & Swank, W.D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Vaporization at supercritical pressures and counterflow condensing of pure and mixed-hydrocarbon working fluids for geothermal power plants

The Heat Cycle Research Program has as its objective the development of the technology for effecting improved utilization of moderate temperature geothermal resources. Current testing involves supercritical vaporization and counterflow in-tube condensing in an organic Rankine cycle. Results of the experiments are given for both pure and mixed-hydrocarbon working fluids. The heater and condenser behavior predicted by the Heat Transfer Research, Inc. computer codes used for correlation of the dat… more

Date: January 1, 1986

Creator: Bliem, C.J.; Demuth, O.J.; Mines, G.L. & Swank, W.D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Supercritical binary geothermal cycle experiments with mixed-hydrocarbon working fluids and a vertical, in-tube, counterflow condenser

The objective is improved utilization of moderate temperature geothermal resources. Current testing involves supercritical vaporization and counterflow in-tube condensing in an organic Rankine cycle. This report presents a description of the test facility and results from a part of the program in which the condenser was oriented in a vertical attitude. Results of the experiments for the supercritical heaters and the countercurrent, vertical, in-tube condenser are given for both pure and mixed-h… more

Date: December 1, 1985

Creator: Demuth, O.J.; Bliem, C.J.; Mines, G.L. & Swank, W.D.

Item Type: Report

Partner: UNT Libraries Government Documents Department