Condensation of R-11 on the outside of vertical enhanced tubes

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A review of condensation experiments with enhanced surface is presented in support of the program to develop improved condensers for geothermal binary power cycles. Experiments were conducted to determine heat transfer performance with Refrigerant-11 (R-11) condensing on the enhanced (outside) surface of single vertical tubes. Twelve tubes of 2.54-cm (1-in.) nominal OD and 1.22 m (4 ft) length with fluted, spiralled, roped, and corrugated surfaces were tested; several of the tested tubes also featured internal enhanced geometries. A smooth tube served as the basis of comparison. Composite heat transfer coefficients (coefficients that include the resistances of both the condensing film ... continued below

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Pages: 15

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Domingo, N. January 1, 1981.

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Description

A review of condensation experiments with enhanced surface is presented in support of the program to develop improved condensers for geothermal binary power cycles. Experiments were conducted to determine heat transfer performance with Refrigerant-11 (R-11) condensing on the enhanced (outside) surface of single vertical tubes. Twelve tubes of 2.54-cm (1-in.) nominal OD and 1.22 m (4 ft) length with fluted, spiralled, roped, and corrugated surfaces were tested; several of the tested tubes also featured internal enhanced geometries. A smooth tube served as the basis of comparison. Composite heat transfer coefficients (coefficients that include the resistances of both the condensing film and the tube wall), based on total tube outside area, are repoted for all tubes, except a double-(internal/external) fluted tube, where only overall heat transfer data are presented. The main conclusions from this study are: (a) for a given heat flux, an external fluted tube can increase composite condensing heat transfer coefficients by up to 5.5 times the smooth tube values, giving better condensing performance than any of the other geometries tested; (b) a further increase in composite condensing coefficients can be achived by using drip skirts to remove the condensate from the surface at intervals along the condensing length; and (c) for a given overall temperature difference and water flow rate, internal flutes can increase the overall performance by up to 17% over that for a tube with identical outside flutes and a smooth inside surface.

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Pages: 15

Notes

NTIS, PC A02/MF A01.

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  • 4. international conference on alternative energy sources, Miami Beach, FL, USA, 14 Dec 1981

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  • Other: DE82005197
  • Report No.: CONF-811212-15
  • Grant Number: W-7405-ENG-26
  • Office of Scientific & Technical Information Report Number: 5488727
  • Archival Resource Key: ark:/67531/metadc1093037

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1981

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • March 28, 2018, 12:38 p.m.

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Domingo, N. Condensation of R-11 on the outside of vertical enhanced tubes, article, January 1, 1981; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1093037/: accessed September 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.