Solubility of selected secondary fluids for use in direct contact geothermal power cycles. [R-113, R-114, isobutane, and pentane]
The use of a direct contact binary power cycle, in connection with a geothermal resource, makes it necessary to consider the solubility of the secondary fluid within the geothermal brine, at the outlet of the power plant. Four possible fluids for use in a direct contact binary cycle were considered. They were: pentane, isobutane, R-113 (trichloro-trifluoro ethane), and R-114 (dichloro-tetrafluoro ethane). The solubility was determined, using gas chromatography, for the temperature range 25 to 95/sup 0/C and also for sodium chloride concentrations ranging from 0 to 25 weight percent. The solubilities of these four fluids were compared as a function of various binary cycle parameters. It was found that isobutane has the lowest absolute solubility, if all the fluids are at the same pressure. Pentane is only slightly more soluble than isobutane, for the same pressure. It was found that pentane is less soluble than the other three fluids, if all four fluids are allowed to expand to their partial pressure for a given temperature. It was also found that pentane was the least expensive of the four fluids to operate at a given condenser temperature and brine outlet temperature.
- Research Organization:
- Utah Univ., Salt Lake City (USA). Dept. of Mechanical Engineering
- DOE Contract Number:
- EY-76-S-07-1549
- OSTI ID:
- 7099580
- Report Number(s):
- IDO-1549-6
- Resource Relation:
- Other Information: Thesis. Submitted by G.W. Hellstrom
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
2-METHYLPROPANE
SOLUBILITY
BINARY-FLUID SYSTEMS
WORKING FLUIDS
FREONS
GEOTHERMAL ENERGY CONVERSION
PENTANE
BRINES
COMPARATIVE EVALUATIONS
GAS CHROMATOGRAPHY
GEOTHERMAL FLUIDS
HEAT EXCHANGERS
SODIUM CHLORIDES
ALKALI METAL COMPOUNDS
ALKANES
CHLORIDES
CHLORINE COMPOUNDS
CHROMATOGRAPHY
CONVERSION
ENERGY CONVERSION
FLUIDS
HALIDES
HALOGEN COMPOUNDS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROCARBONS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
REFRIGERANTS
SEPARATION PROCESSES
SODIUM COMPOUNDS