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An experimental test facility capable of investigating plain and enhanced horizontal tubes was built. The test facility consists of an electric boiler, test condenser and associated piping for steam, condensate and cooling water. Performance of the test condenser was checked at a steam pressure of 3 psia with cooling water velocities ranging from 5 to 25 ft/sec. Condensation data was obtained for a single, 0.625 inch outside diameter, 90-10 copper-nickel tube in a simualted tube bundle to determine the overall, inside and outside heat transfer coefficients. The overall heat transfer coefficient was determined directly from experimental data, and the Wilson Plot technique was used to determine the inside and outside heat transfer coefficients. The experimentally obtained values for the inside heat transfer coefficient are within 5 percent of the theoretical values predicted by the Sieder-Tate equation. The experimental values obtained for the outside heat transfer coefficient are within 8 percent of the theoretical values predicted by the Nusselt equation. (Author).
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Heat transfer and hydrodynamic performance of three different spirally fluted tubes was determined. The tubes were 5/8-in. in nominal diameter and were made of aluminum. Results were compared to 5/8.in. OD, smooth copper-nickel and aluminum tubes. Data was taken by condensing steam at about 3 psia on the outside surface of a horizontally mounted tube in the center of a tube bank. The center tube was cooled by water on the inside at velocities of 3 to 25 feet per second. The overall heat transfer coefficient was determined directly from experimental data. The inside and outside heat transfer coefficients were determined using the Wilson plot technique. The cooling water pressure drop was measured inside the tube and converted to the friction factor in the enhanced section. The overall heat transfer coefficients of the enhanced tubes were as large as 1.75 times the corresponding smooth tube value for the same mass flow rate of cooling water. The inside heat transfer coefficients increased by about a factor of 3 while the outside heat transfer coefficients decreased by 10 to 20 percent when compared to smooth tube values. The results of this work indicate that the required condenser surface area can be reduced by 50 percent if these enhanced tubes are used in place of smooth tubes. (Author).
"This experiment investigated the effects of the inlet water temperature on the overall condensing heat transfer coefficient in a surface condenser. The results of the testing during the investigation were used to determine a temperature correction factor which was then compared to the correlation published by the Heat Exchange Institute ' . The comparison revealed that the correlation published by the Heat Exchange Institute is not accurate for inlet water temperature less than 65 F and greater than 75 F. In addition, a comparison was made between the overall heat transfer coefficient that was obtained by experiment and the overall heat transfer coefficient as calculated by the additive resistance method using the Petukhov-Popov correlation for the water side coefficient and the Nusselt single tube correlation for the steam side coefficient. From this comparison it was determined that the additive resistance method using the Petukhov-Popov correlation for the water side coefficient and the single tube Nusselt correlation predicts the overall heat transfer coefficient for 7/8 inch tubes on a 1.125 inch pitch within 6% of the experimental value over a cooling water inlet temperature rangeof55F to 80F."--Abstract.