Condensation film coefficients for mixtures of isobutane and isopentane
Research designed to obtain baseline data on heat transfer for working fluids in geothermal binary cycle systems is described. The working fluid loop in the experimental apparatus simulates the binary cycle with steam as the heating fluid and a throttling valve instead of the turbine. Data on film coefficient for the condensation of 90/10 and 80/20 mixtures of isobutane-isopentane on a horizontal tube at various temperatures and condensation rates are presented. Data indicate that mixtures of isobutane-isopentane have lower condensation film coefficients than that of the pure isobutane under equivalent conditions of temperatures and condensation rates. Depending on the mass condensation rate, the film coefficient for the 80/20 mixture can be as low as 30 percent of the film coefficient for pure isobutane at the same mass condensation rate.
- Research Organization:
- California Univ., Berkeley (USA). Lawrence Berkeley Lab.; California Univ., Richmond (USA). Sea Water Conversion Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5263172
- Report Number(s):
- LBL-11025; CONF-800806-34
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
150802* -- Geothermal Power Plants-- Power Plant Systems & Components
2-METHYLBUTANE
2-METHYLPROPANE
ALKANES
BINARY-FLUID SYSTEMS
DISPERSIONS
FILM CONDENSATION
FLUIDS
GEOTHERMAL POWER PLANTS
Geothermal Legacy
HYDROCARBONS
MIXTURES
ORGANIC COMPOUNDS
POWER PLANTS
REYNOLDS NUMBER
THERMAL POWER PLANTS
TUBES
VAPOR CONDENSATION
WORKING FLUIDS