Condensation Heat Transfer Measurements Of Refrigerants On Externally Enhanced Tubes

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Condensation Heat-Transfer Measurements of Refrigerants on Externally Enhanced Tubes

Author : David S. Zebrowski
Publisher :
ISBN 13 :
Total Pages : 149 pages
Book Rating : 4.:/5 (227 download)

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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.

Condensation Heat-Transfer Measurements of Refrigerants on Externally Enhanced Tubes

Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (227 download)

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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.

Persian Art and Architecture

Author : Sazman-i Jughrafiya'i Kishvar
Publisher :
ISBN 13 :
Total Pages : 195 pages
Book Rating : 4.:/5 (169 download)

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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:

Condensation of Refrigerant-11 on the Outside of Vertical Enhanced Tubes

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (685 download)

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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.

Analytical and Experimental Study of the Effects of Oil on the Heat Transfer Coefficient of Condensing Refrigerant Vapor at the External Surface of Plain Horizontal Tubes [microform]

Download Analytical and Experimental Study of the Effects of Oil on the Heat Transfer Coefficient of Condensing Refrigerant Vapor at the External Surface of Plain Horizontal Tubes [microform] PDF Online Free

Author : Adnan A. (Adnan Abdulwahab) Al-Kalamchi
Publisher : National Library of Canada
ISBN 13 : 9780315176096
Total Pages : 492 pages
Book Rating : 4.1/5 (76 download)

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Book Synopsis Analytical and Experimental Study of the Effects of Oil on the Heat Transfer Coefficient of Condensing Refrigerant Vapor at the External Surface of Plain Horizontal Tubes [microform] by : Adnan A. (Adnan Abdulwahab) Al-Kalamchi

Download or read book Analytical and Experimental Study of the Effects of Oil on the Heat Transfer Coefficient of Condensing Refrigerant Vapor at the External Surface of Plain Horizontal Tubes [microform] written by Adnan A. (Adnan Abdulwahab) Al-Kalamchi and published by National Library of Canada. This book was released on 1984 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Condensation of Refrigerants Flowing Inside Smooth and Corrugated Tubes

Author :
Publisher :
ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (683 download)

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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.

Local Heat Transfer Measurements for R-11 Condensing with and Without the Presence of a Noncondensing Gas

Author : William Rudoy
Publisher :
ISBN 13 :
Total Pages : 384 pages
Book Rating : 4.:/5 (225 download)

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Book Synopsis Local Heat Transfer Measurements for R-11 Condensing with and Without the Presence of a Noncondensing Gas by : William Rudoy

Download or read book Local Heat Transfer Measurements for R-11 Condensing with and Without the Presence of a Noncondensing Gas written by William Rudoy and published by . This book was released on 1976 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Heat Transfer Enhancement in Externally Finned Tubes and Internally Finned Tubes and Annuli

Author : Sujoy Kumar Saha
Publisher : Springer
ISBN 13 : 303020748X
Total Pages : 175 pages
Book Rating : 4.0/5 (32 download)

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Book Synopsis Heat Transfer Enhancement in Externally Finned Tubes and Internally Finned Tubes and Annuli by : Sujoy Kumar Saha

Download or read book Heat Transfer Enhancement in Externally Finned Tubes and Internally Finned Tubes and Annuli written by Sujoy Kumar Saha and published by Springer. This book was released on 2019-07-26 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Brief deals with externally finned tubes, their geometric parameters, Reynolds number, dimensionless variables, friction factor, plain plate fins on round tubes, the effect of fin spacing, correlations, pain individually finned tubes, circular fins with staggered tubes, low integral fin tubes, wavy fin, enhanced plate fin geometries with round tubes, Offset Strip Fins, convex louver fins, louvered fin, perforated fin, mesh fin, vortex generator, enhanced circular fin geometries, spine or segmented fin, wire loop fin, flat extruded tubes with internal membranes, plate and fin automotive radiators, performance comparison, numerical simulation, advanced fin geometries, hydrophilic coatings, internally finned tubes and annuli, spirally fluted and indented tube, advanced internal fin geometries, and finned annuli. The book is ideal for professionals and researchers dealing with thermal management in devices.

Encyclopedia Of Two-phase Heat Transfer And Flow I: Fundamentals And Methods (A 4-volume Set)

Author : John R Thome
Publisher : World Scientific
ISBN 13 : 9814623229
Total Pages : 1109 pages
Book Rating : 4.8/5 (146 download)

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Book Synopsis Encyclopedia Of Two-phase Heat Transfer And Flow I: Fundamentals And Methods (A 4-volume Set) by : John R Thome

Download or read book Encyclopedia Of Two-phase Heat Transfer And Flow I: Fundamentals And Methods (A 4-volume Set) written by John R Thome and published by World Scientific. This book was released on 2015-08-14 with total page 1109 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of the two-set series is to present a very detailed and up-to-date reference for researchers and practicing engineers in the fields of mechanical, refrigeration, chemical, nuclear and electronics engineering on the important topic of two-phase heat transfer and two-phase flow. The scope of the first set of 4 volumes presents the fundamentals of the two-phase flows and heat transfer mechanisms, and describes in detail the most important prediction methods, while the scope of the second set of 4 volumes presents numerous special topics and numerous applications, also including numerical simulation methods.Practicing engineers will find extensive coverage to applications involving: multi-microchannel evaporator cold plates for electronics cooling, boiling on enhanced tubes and tube bundles, flow pattern based methods for predicting boiling and condensation inside horizontal tubes, pressure drop methods for singularies (U-bends and contractions), boiling in multiport tubes, and boiling and condensation in plate heat exchangers. All of these chapters include the latest methods for predicting not only local heat transfer coefficients but also pressure drops.Professors and students will find this 'Encyclopediaa of Two-Phase Heat Transfer and Flow' particularly exciting, as it contains authored books and thorough state-of-the-art reviews on many basic and special topics, such as numerical modeling of two-phase heat tranfser and adiabatic bubbly and slug flows, the unified annular flow boiling model, flow pattern maps, condensation and boiling theories, new emerging topics, etc.

Horizontal Convective Condensation of Alternative Refrigerants Within a Micro-Fin Tube (Classic Reprint)

Author : Mark a Kedzierski
Publisher : Forgotten Books
ISBN 13 : 9780266908968
Total Pages : 80 pages
Book Rating : 4.9/5 (89 download)

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Book Synopsis Horizontal Convective Condensation of Alternative Refrigerants Within a Micro-Fin Tube (Classic Reprint) by : Mark a Kedzierski

Download or read book Horizontal Convective Condensation of Alternative Refrigerants Within a Micro-Fin Tube (Classic Reprint) written by Mark a Kedzierski and published by Forgotten Books. This book was released on 2017-10-28 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Horizontal Convective Condensation of Alternative Refrigerants Within a Micro-Fin Tube As shown in Fig. 3, six refrigerant pressure taps along the test section allowed the measurement of the upstream absolute pressure and five pressure drops along the test section. Two sets of two water pressure taps were used to measure the water pressure drop along each tube. Also, a sheathed thermocouple measured the refrigerant temperature at each end of the two refrigerant tubes, with the junction of each centered radially. Only the thermocouple at the inlet of the first tube was used in the calculations. Theentire test section was wrapped with 5 cm of foam insulation to minimize heat transfer between the water and the ambient. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Masters Theses in the Pure and Applied Sciences

Author : Wade H. Shafer
Publisher : Springer Science & Business Media
ISBN 13 : 1461573947
Total Pages : 430 pages
Book Rating : 4.4/5 (615 download)

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Book Synopsis Masters Theses in the Pure and Applied Sciences by : Wade H. Shafer

Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Oata Analysis and Synthesis (CINOAS) * at Purdue. University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 33 (thesis year 1988) a total of 13,273 theses titles from 23 Canadian and 1 85 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 33 reports theses submitted in 1988, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.

Condensing Coefficients of the Refrigerant Mixture R-22/R-142b in Smooth Tubes and During Enhanced Heat Transfer Configurations

Author : Floris Jakobus Smit
Publisher :
ISBN 13 :
Total Pages : 128 pages
Book Rating : 4.:/5 (529 download)

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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:

Condensation Heat Transfer Enhancement

Author : V. G. Rifert
Publisher : WIT Press (UK)
ISBN 13 :
Total Pages : 402 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Condensation Heat Transfer Enhancement by : V. G. Rifert

Download or read book Condensation Heat Transfer Enhancement written by V. G. Rifert and published by WIT Press (UK). This book was released on 2004 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: In processes with condensation of steam-to-gas compositions or refrigerative agents an intensification of condensation is often required because thermal resistance on the condensation side can be greater than the thermal resistance of the heat transfer wall on the cooling side. In this work, a pair of researchers from the National Technical U. of Ukraine and the State Academy of Refrigeration (Ukraine) provide information about the enhancement of condensation, including research results from the former USSR they feel deserves wider dissemination as well as discussion of different theoretical models of the condensation process. The US office of WIT Press is Computational Mechanics. Annotation : 2004 Book News, Inc., Portland, OR (booknews.com).

Measurements of Heat-transfer Coefficients of Nonazeotropic Refrigerant Mixtures Condensing Inside Horizontal Tubes

Author : David Paul Degrush
Publisher :
ISBN 13 :
Total Pages : 326 pages
Book Rating : 4.:/5 (355 download)

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Book Synopsis Measurements of Heat-transfer Coefficients of Nonazeotropic Refrigerant Mixtures Condensing Inside Horizontal Tubes by : David Paul Degrush

Download or read book Measurements of Heat-transfer Coefficients of Nonazeotropic Refrigerant Mixtures Condensing Inside Horizontal Tubes written by David Paul Degrush and published by . This book was released on 1986 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Scientific and Technical Aerospace Reports

Author :
Publisher :
ISBN 13 :
Total Pages : 804 pages
Book Rating : 4.:/5 (3 download)

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Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Condensation of R-11 on the Outside of Vertical Enhanced Tubes

Author : N. Domingo
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (796 download)

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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:

Condensation of Refrigerants on Small Tube Bundles

Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (227 download)

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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).