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Title: Hydrocarbon heat transfer coefficients: preliminary isobutane results

Abstract

Research designed to obtain baseline heat transfer data on secondary fluid candidates for geothermal cycle systems is described. The apparatus was designed to provide baseline data under clean conditions to determine inside and outside heat transfer film coefficient, respectivly, for heating and condensation of secondary fluids being considered for binary systems. The secondary fluid loop simulates the binary cycle with steam, instead of geothermal fluid, as the heating fluid and a throttling valve instead of the turbine. Results on film coefficient for condensing the isobutane on the outside of a tube at various pressures and condensate loading, as well as preliminary results on flm coefficient for heating the isobutane inside a tube at 4.14 MPa (600 psia) and various flow rates, are presented. The isobutane was heated in a horizontal, type 316 stainless steel, instrumented tube by steam condensing on the outside. In the condenser, the isobutane was condensed on the outside of a horizontal tube, idential to that in the heater, by cooling water inside the tube. Each instrumented tube was fitted with a total of fifteen thermocouples imbedded in the wall of the tube at five stations located equally along the length of the tube. The inside andmore » outside wall temperature of the tube at each of the five stations was calculated from the location of the imbedded thermocouples and their temperatures. The heat rate to the isobutane in the heater was determined by measuring the rate of condensing steam on the outside of the tube under eachof four sections by means of specially designed vapor-traced meters. The heat rate released by the condensing isobutane was also determined by measuring the rate of isobutane condensing on the outside of the tube with meters similar to those in the heater.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
California Univ., Berkeley (USA). Lawrence Berkeley Lab.
OSTI Identifier:
6273468
Report Number(s):
LBL-8645
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; 36 MATERIALS SCIENCE; 2-METHYLPROPANE; HEAT TRANSFER; THERMAL CONDUCTIVITY; BINARY-FLUID SYSTEMS; WORKING FLUIDS; ENTHALPY; FILM CONDENSATION; GEOTHERMAL ENERGY CONVERSION; HEATING; STAINLESS STEEL-316; TEMPERATURE DISTRIBUTION; TUBES; ALKANES; ALLOYS; CHROMIUM ALLOYS; CHROMIUM STEELS; CHROMIUM-NICKEL STEELS; CONVERSION; CORROSION RESISTANT ALLOYS; ENERGY CONVERSION; ENERGY TRANSFER; FLUIDS; HEAT RESISTANT MATERIALS; HEAT RESISTING ALLOYS; HYDROCARBONS; IRON ALLOYS; IRON BASE ALLOYS; MATERIALS; MOLYBDENUM ALLOYS; NICKEL ALLOYS; ORGANIC COMPOUNDS; PHYSICAL PROPERTIES; STAINLESS STEELS; STEELS; THERMODYNAMIC PROPERTIES; VAPOR CONDENSATION; Geothermal Legacy; 150802* - Geothermal Power Plants- Power Plant Systems & Components; 360603 - Materials- Properties

Citation Formats

Tleimat, B.W., Laird, A.D.K., Rie, H., Hsu, I.C., and Seban, R.A. Hydrocarbon heat transfer coefficients: preliminary isobutane results. United States: N. p., 1979. Web. doi:10.2172/6273468.
Tleimat, B.W., Laird, A.D.K., Rie, H., Hsu, I.C., & Seban, R.A. Hydrocarbon heat transfer coefficients: preliminary isobutane results. United States. doi:10.2172/6273468.
Tleimat, B.W., Laird, A.D.K., Rie, H., Hsu, I.C., and Seban, R.A. Thu . "Hydrocarbon heat transfer coefficients: preliminary isobutane results". United States. doi:10.2172/6273468. https://www.osti.gov/servlets/purl/6273468.
@article{osti_6273468,
title = {Hydrocarbon heat transfer coefficients: preliminary isobutane results},
author = {Tleimat, B.W. and Laird, A.D.K. and Rie, H. and Hsu, I.C. and Seban, R.A.},
abstractNote = {Research designed to obtain baseline heat transfer data on secondary fluid candidates for geothermal cycle systems is described. The apparatus was designed to provide baseline data under clean conditions to determine inside and outside heat transfer film coefficient, respectivly, for heating and condensation of secondary fluids being considered for binary systems. The secondary fluid loop simulates the binary cycle with steam, instead of geothermal fluid, as the heating fluid and a throttling valve instead of the turbine. Results on film coefficient for condensing the isobutane on the outside of a tube at various pressures and condensate loading, as well as preliminary results on flm coefficient for heating the isobutane inside a tube at 4.14 MPa (600 psia) and various flow rates, are presented. The isobutane was heated in a horizontal, type 316 stainless steel, instrumented tube by steam condensing on the outside. In the condenser, the isobutane was condensed on the outside of a horizontal tube, idential to that in the heater, by cooling water inside the tube. Each instrumented tube was fitted with a total of fifteen thermocouples imbedded in the wall of the tube at five stations located equally along the length of the tube. The inside and outside wall temperature of the tube at each of the five stations was calculated from the location of the imbedded thermocouples and their temperatures. The heat rate to the isobutane in the heater was determined by measuring the rate of condensing steam on the outside of the tube under eachof four sections by means of specially designed vapor-traced meters. The heat rate released by the condensing isobutane was also determined by measuring the rate of isobutane condensing on the outside of the tube with meters similar to those in the heater.},
doi = {10.2172/6273468},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {2}
}