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

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Experiments were conducted to determine heat transfer performance of single vertical tubes with Refrigerant-11 condensing on its outside surface. Twelve enhanced (fluted, spiraled, roped, and corrugated) tubes of 2.54-cm (1-in.) nominal outside diameter and 1.2-m (4-ft) length were tested. Several of the tested tubes featured internal enhanced geometries. A previously tested smooth tube served as the basis for comparison. Composite heat transfer coefficients (coefficients that include the resistances of both the condensing film and the tube wall), based on the total tube outside surface area, ranged from 850 to 6530 W/m/sup 2/ . K (150 to 1150 Btu/h . ft/sup ... continued below

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Pages: 90

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Domingo, N. August 1, 1981.

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Description

Experiments were conducted to determine heat transfer performance of single vertical tubes with Refrigerant-11 condensing on its outside surface. Twelve enhanced (fluted, spiraled, roped, and corrugated) tubes of 2.54-cm (1-in.) nominal outside diameter and 1.2-m (4-ft) length were tested. Several of the tested tubes featured internal enhanced geometries. A previously tested smooth tube served as the basis for comparison. Composite heat transfer coefficients (coefficients that include the resistances of both the condensing film and the tube wall), based on the total tube outside surface area, ranged from 850 to 6530 W/m/sup 2/ . K (150 to 1150 Btu/h . ft/sup 2/ . /sup 0/F) over the heat flux range of 5675 to 31,375 W/m/sup 2/ (1800 to 9950 Btu/h . ft/sup 2/). The primary conclusions from this study are: (1) 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; (2) further increase in composite condensing coefficients can be achieved by using skirts to divide the fluted tube into equal condensing lengths; and (3) 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: 90

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NTIS, PC A05/MF A01.

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  • Other: DE81026085
  • Report No.: ORNL/TM-7797
  • Grant Number: W-7405-ENG-26
  • DOI: 10.2172/6167136 | External Link
  • Office of Scientific & Technical Information Report Number: 6167136
  • Archival Resource Key: ark:/67531/metadc1106429

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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.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • August 1, 1981

Added to The UNT Digital Library

  • Feb. 22, 2018, 7:45 p.m.

Description Last Updated

  • May 16, 2018, 1:09 p.m.

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Domingo, N. Condensation of Refrigerant-11 on the outside of vertical enhanced tubes, report, August 1, 1981; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1106429/: accessed November 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.