Analyses of mixed-hydrocarbon binary thermodynamic cycles for moderate-temperature geothermal resources
A number of binary geothermal cycles utilizing mixed hydrocarbon working fluids were analyzed with the overall objective of finding a working fluid which can produce low-cost electrical energy using a moderately-low temperature geothermal resource. Both boiling and supercritical shell-and-tube cycles were considered. The performance of a dual-boiling isobutane cycle supplied by a 280/sup 0/F hydrothermal resource (corresponding to the 5 MW pilot plant at the Raft River site in Idaho) was selected as a reference. To investigate the effect of resource temperature on the choice of working fluid, several analyses were conducted for a 360/sup 0/F hydrothermal resource, which is representative of the Heber resource in California. The hydrocarbon working fluids analyzed included methane, ethane, propane, isobutane, isopentane, hexane, heptane, and mixtures of those pure hydrocarbons. For comparison, two fluorocarbon refrigerants were also analyzed. These fluorocarbons, R-115 and R-22, were suggested as resulting in high values of net plant geofluid effectiveness (watt-hr/lbm geofluid) at the two resource temperatures chosen for the study. Preliminary estimates of relative heat exchanger size (product of overall heat transfer coefficient times heater surface area) were made for a number of the better performing cycles.
- Research Organization:
- EG and G Idaho, Inc., Idaho Falls (USA)
- DOE Contract Number:
- AC07-76ID01570
- OSTI ID:
- 6889398
- Report Number(s):
- EGG-PG-G-80-041
- Country of Publication:
- United States
- Language:
- English
Similar Records
Analyses of mixed hydrocarbon binary thermodynamic cycles for moderate temperature geothermal resources
Analysis of binary thermodynamic cycles for a moderately low-temperature geothermal resource
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Conference
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Wed Dec 31 23:00:00 EST 1980
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OSTI ID:5598742
Analysis of binary thermodynamic cycles for a moderately low-temperature geothermal resource
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Sun Jul 01 00:00:00 EDT 1979
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Related Subjects
15 GEOTHERMAL ENERGY
150802* -- Geothermal Power Plants-- Power Plant Systems & Components
2-METHYLBUTANE
2-METHYLPROPANE
ALKANES
BINARY MIXTURES
BINARY-FLUID SYSTEMS
DATA
DISPERSIONS
ENERGY SYSTEMS
ETHANE
EVALUATION
FLUIDS
FREONS
GEOTHERMAL POWER PLANTS
Geothermal Legacy
HALOGENATED ALIPHATIC HYDROCARBONS
HEAT EXCHANGERS
HEPTANE
HEXANE
HYDROCARBONS
INFORMATION
METHANE
MIXTURES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PERFORMANCE
POWER
POWER PLANTS
PROPANE
TEMPERATURE EFFECTS
TESTING
THEORETICAL DATA
THERMAL POWER PLANTS
THERMODYNAMIC CYCLES
WORKING FLUIDS
150802* -- Geothermal Power Plants-- Power Plant Systems & Components
2-METHYLBUTANE
2-METHYLPROPANE
ALKANES
BINARY MIXTURES
BINARY-FLUID SYSTEMS
DATA
DISPERSIONS
ENERGY SYSTEMS
ETHANE
EVALUATION
FLUIDS
FREONS
GEOTHERMAL POWER PLANTS
Geothermal Legacy
HALOGENATED ALIPHATIC HYDROCARBONS
HEAT EXCHANGERS
HEPTANE
HEXANE
HYDROCARBONS
INFORMATION
METHANE
MIXTURES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PERFORMANCE
POWER
POWER PLANTS
PROPANE
TEMPERATURE EFFECTS
TESTING
THEORETICAL DATA
THERMAL POWER PLANTS
THERMODYNAMIC CYCLES
WORKING FLUIDS