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Condensing Coefficients Of The Refrigerant Mixture R 22 R 142b In Smooth Tubes And During Enhanced Heat Transfer Configurations
Download Condensing Coefficients Of The Refrigerant Mixture R 22 R 142b In Smooth Tubes And During Enhanced Heat Transfer Configurations full books in PDF, epub, and Kindle. Read online Condensing Coefficients Of The Refrigerant Mixture R 22 R 142b In Smooth Tubes And During Enhanced Heat Transfer Configurations ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Condensing Coefficients of the Refrigerant Mixture R-22/R-142b in Smooth Tubes and During Enhanced Heat Transfer Configurations by : Floris Jakobus Smit
Download or read book Condensing Coefficients of the Refrigerant Mixture R-22/R-142b in Smooth Tubes and During Enhanced Heat Transfer Configurations written by Floris Jakobus Smit and published by . This book was released on 2002 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of Heat Transfer written by and published by . This book was released on 2002 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Condensation of Refrigerants Flowing Inside Smooth and Corrugated Tubes by :
Download or read book Condensation of Refrigerants Flowing Inside Smooth and Corrugated Tubes written by and published by . This book was released on 1995 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Because heat exchanger thermal performance has a direct fluence on the overall cycle performance of vapor-compression refrigeration machinery, enhanced heat transfer surfaces are of interest to improve the efficiency of heat pumps and air conditioners. We investigated R-22 and a nonazeotropic refrigerant mixture (NARM) of 75% R-143a and 25% R-124 (by mass) to study their thermal performance in a condenser made of conventional smooth tubes and another condenser made of corrugated, or spirally indented, tubes. We investigated the condensing heat transfer and pressure drop characteristics in an experimental test loop model of a domestic beat pump system employing a variable speed compressor. The refrigerant circulates inside the central tube and the water circulates in the annulus. At refrigerant mass fluxes of approximately 275--300 kg/m2s, the measured irreversible pressure drop of the corrugated surface was 23% higher than that of the smooth surface for the R-22. At refrigerant mass fluxes of 350-370 kg/m2s, the irreversible pressure drop of the corrugated surface was 36% higher than that of the smooth surface for the NARM. The average heat transfer coefficient for the corrugated surface for R-22 was roughly 40% higher than that for the smooth tube surface at refrigerant mass fluxes of 275--295 kg/m2s. The average heat transfer coefficient for the corrugated surface for the NARM was typically 70% higher than that for the smooth tube surface at refrigerant mass fluxes of 340--385 kg/m2s.
Book Synopsis Bulletin de l'Institut international du froid by :
Download or read book Bulletin de l'Institut international du froid written by and published by . This book was released on 2004 with total page 766 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Condensation of a New Alternative Refrigerant Flowing Inside Horizontal Smooth Tubes by : Mallikarjuna S. Chitti
Download or read book Condensation of a New Alternative Refrigerant Flowing Inside Horizontal Smooth Tubes written by Mallikarjuna S. Chitti and published by . This book was released on 1994 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Condensation heat transfer and pressure drop coefficients of R22/R142b in a water cooled helicaly coiled tube-in-tube heat exchanger by : Shiko Ashandemie Kebonte
Download or read book Condensation heat transfer and pressure drop coefficients of R22/R142b in a water cooled helicaly coiled tube-in-tube heat exchanger written by Shiko Ashandemie Kebonte and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Condensation Heat-Transfer Measurements of Refrigerants on Externally Enhanced Tubes by :
Download or read book Condensation Heat-Transfer Measurements of Refrigerants on Externally Enhanced Tubes written by and published by . This book was released on 1987 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An apparatus was designed and fabricated for testing of a horizontal bundle of five tubes in a vertical row with R-114 as the working fluid. Twenty-four tubes with rectangular-section fins ansd a smooth tube were tested in a single-tube apparatus using R-113 as the working fluid. An enhancement ratio (based on constant vapor-side temperature drop) of about 7.0 was obtained for the best-performing tube. Among the tubes tested, the optimum fin spacing was found to be between 0.25 mm to 0.5 mm. The optimum fin thickness for tubes with a 1.0 mm fin height was found to be 0.5 mm. The vapor-side enhancement ratio increased with increasing fin height. However, the rate of increase in the vapor-side enhancement was found to be smaller with increasing fin height compared to the rate of area increase. The indirect measurement of the local condensing heat-transfer coefficient around a finned tube showed a local value at the top of each of the two tubes tested that is approximately twice the average value for the entire tube.
Book Synopsis Condensation Heat-Transfer Measurements of Refrigerants on Externally Enhanced Tubes by : David S. Zebrowski
Download or read book Condensation Heat-Transfer Measurements of Refrigerants on Externally Enhanced Tubes written by David S. Zebrowski and published by . This book was released on 1987 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: An apparatus was designed and fabricated for testing of a horizontal bundle of five tubes in a vertical row with R-114 as the working fluid. Twenty-four tubes with rectangular-section fins ansd a smooth tube were tested in a single-tube apparatus using R-113 as the working fluid. An enhancement ratio (based on constant vapor-side temperature drop) of about 7.0 was obtained for the best-performing tube. Among the tubes tested, the optimum fin spacing was found to be between 0.25 mm to 0.5 mm. The optimum fin thickness for tubes with a 1.0 mm fin height was found to be 0.5 mm. The vapor-side enhancement ratio increased with increasing fin height. However, the rate of increase in the vapor-side enhancement was found to be smaller with increasing fin height compared to the rate of area increase. The indirect measurement of the local condensing heat-transfer coefficient around a finned tube showed a local value at the top of each of the two tubes tested that is approximately twice the average value for the entire tube.
Book Synopsis Persian Art and Architecture by : Sazman-i Jughrafiya'i Kishvar
Download or read book Persian Art and Architecture written by Sazman-i Jughrafiya'i Kishvar and published by . This book was released on 1973 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flow Regimes of Refrigerant Mixtures Condensing Inside Tubes by : E. Kornota
Download or read book Flow Regimes of Refrigerant Mixtures Condensing Inside Tubes written by E. Kornota and published by . This book was released on 1984 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Condensation Heat Transfer of R-22 and R-32/R-125 Mixtures in a Smooth, Horizontal Tube by : Brandon J. Unruh
Download or read book Condensation Heat Transfer of R-22 and R-32/R-125 Mixtures in a Smooth, Horizontal Tube written by Brandon J. Unruh and published by . This book was released on 1995 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Condensation of Refrigerant-11 on the Outside of Vertical Enhanced Tubes by :
Download or read book Condensation of Refrigerant-11 on the Outside of Vertical Enhanced Tubes written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Condensation of Refrigerants on Small Tube Bundles by : Burlin Davis Mabrey
Download or read book Condensation of Refrigerants on Small Tube Bundles written by Burlin Davis Mabrey and published by . This book was released on 1988 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: The construction of an apparatus for the condensation performance testing of a horizontal bundle of four tubes with various refrigerants was completed. The apparatus was instrumented, and data reduction software was developed to provide bundle and single tube condensation data. Two tube bundles were tested, smooth copper tubes and low integral-fin copper-nickel tubes, with two refrigerants, R-114 and R-113. An enhancement ratio of about 2.0 for the overall heat transfer coefficient was demonstrated for the finned tubes over the smooth tubes. Internal contamination, possibly due to a breakdown of the refrigerant molecules when subjected to high temperatures in the boiling chamber, inhibited further meaningful data collection. Recommendations for improvement of the test apparatus are made. Condensation; Heat-transfer coefficient; Finned tubes; Enhancement ratio; Filmwise; Inundation; Tube bundle, Refrigeration systems. (jes).
Book Synopsis Condensation of R-11 on the Outside of Vertical Enhanced Tubes by : N. Domingo
Download or read book Condensation of R-11 on the Outside of Vertical Enhanced Tubes written by N. Domingo and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Tubeside Condensation of Nonazeotropic Refrigerant Mixtures for Two Enhanced Surfaces by :
Download or read book Tubeside Condensation of Nonazeotropic Refrigerant Mixtures for Two Enhanced Surfaces written by and published by . This book was released on 1990 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: As part of the Building Equipment Research program at Oak Ridge National Laboratory (ORNL), nonazeotropic refrigerant mixtures (NARMs) are being investigated to replace chlorofluorocarbon compounds. The condensation of NARMs is not isothermal, and this can improve the heat exchanger effectiveness of a condenser as well as improve thermodynamic cycle efficiencies. The total condensing heat transfer coefficients for refrigerant R22 and for four nonazeotropic mixtures of refrigerants R143a and R124 were measured and are presented as a function of mass flux for two inside tube surfaces, one having spiral ridged fins and the other having a spirally corrugated or fluted surface. The total condensing coefficient for the finned tube is higher than that for the fluted tube at any given refrigerant mass flux for all the refrigerant mixtures. The measured irrecoverable pressure drop for the finned tube was approximately half that for the fluted tube; thus, the finned tube has the better thermal performance of the two enhanced tubes. The condensing heat transfer coefficient is also presented as a function of the mass fraction of R143a for three values of mass flux. Degradation of the condensing coefficient for intermediate values of R143a mass fraction is apparent, but has different trends with respect to mass flux for the two enhanced surfaces; thus, the geometry of the enhanced surface appears to affect the physical mechanism for condensation of NARMs. 13 refs., 9 figs.
Book Synopsis Condensation of Refrigerants on Small Tube Bundles by :
Download or read book Condensation of Refrigerants on Small Tube Bundles written by and published by . This book was released on 1988 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The construction of an apparatus for the condensation performance testing of a horizontal bundle of four tubes with various refrigerants was completed. The apparatus was instrumented, and data reduction software was developed to provide bundle and single tube condensation data. Two tube bundles were tested, smooth copper tubes and low integral-fin copper-nickel tubes, with two refrigerants, R-114 and R-113. An enhancement ratio of about 2.0 for the overall heat transfer coefficient was demonstrated for the finned tubes over the smooth tubes. Internal contamination, possibly due to a breakdown of the refrigerant molecules when subjected to high temperatures in the boiling chamber, inhibited further meaningful data collection. Recommendations for improvement of the test apparatus are made. Condensation; Heat-transfer coefficient; Finned tubes; Enhancement ratio; Filmwise; Inundation; Tube bundle, Refrigeration systems. (jes).
Book Synopsis Enhanced Condensation of R-113 on a Small Bundle of Horizontal Tubes by :
Download or read book Enhanced Condensation of R-113 on a Small Bundle of Horizontal Tubes written by and published by . This book was released on 1991 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Condensation of R-113 was studied using an evaporator condenser test platform. The condenser section contained four horizontal tubes (nominal outer diameter 15.9 mm) forming a vertical in line column with a pitch-to-diameter ratio of 2.25 and a condensing length of 1.2m. The condenser tubes could be operated either individually (ie. as a single tube apparatus) or as a small tube bundle. This allowed investigation of the effects of condensate inundation on different types of condenser tubes. Tubes tested were smooth copper tubes, copper/nickel KORODENSE roped tubes, KORODENSE tubes wrapped with wire, and copper/nickel finned tubes (26 fpi). The outside heat transfer coefficient was calculated by experimentally determining the overall heat transfer coefficient and then using a modified Wilson Plot procedure. Great care was taken to ensure the results were not vitiated by the presence of noncondensibles. Results obtained with the smooth copper tubes are in agreement with published data and verify satisfactory operation of the test platform. Furthermore, problems associated with the apparatus encountered by previous workers were successfully overcome. In comparison to the top smooth tubes, the copper nickel top KORODENSE tube yielded about a 22% increase.
