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1 edition of Effects of condensate inundation and vapor velocity on heat transfer in a condenser tube bundle found in the catalog.

Effects of condensate inundation and vapor velocity on heat transfer in a condenser tube bundle

Paul Jeffrey Noftz

Effects of condensate inundation and vapor velocity on heat transfer in a condenser tube bundle

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  • 16 Currently reading

Published by Naval Postgraduate School in Monterey, California .
Written in English

    Subjects:
  • Mechanical engineering

  • Edition Notes

    SeriesNPS69-82-001
    ID Numbers
    Open LibraryOL25527676M

    Heat Transfer Enhancement in Shell and Tube Condenser Priyanka Padgil*, S.H. Barhatte and ary epartment of echanical ngineering, A ’s, une , Maharashtra, India Accepted 12 March , Available online 16 March , Special Issue-7 (March ) Abstract.   Shell And Tube Heat Exchanger Tube Failure - posted in Industrial Professionals: We have two shell and tube heat exchangers that were just put into service in the last month. They are for process and make-up air heating with 45 psig steam in the shell and 40% propylene glycol through the tubes. The heat exchangers are simple horizontal u-tube with ¾” x ” stainless steel tubes. Forced convection heat transfer is an active area of experimental investigation motivated by a virtually unlimited number of applications that are of interest to designers of thermal systems. One important application €or forced convection heat transfer is the cooling of gas turbine engine components utilizing air drawn from the compressor.


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Effects of condensate inundation and vapor velocity on heat transfer in a condenser tube bundle by Paul Jeffrey Noftz Download PDF EPUB FB2

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Effects of condensate inundation and vapor velocity on heat transfer in a condenser tube bundle. by Noftz, Paul : McNaught, J. () Two-phase forced convection heat transfer during condensation on horizontal tube bundles, Proc. 7th Int. Heat Transfer Conf., Munich, 5, – Nobbs, D. () The Effect of Downward Vapor Velocity and Inundation on the Condensation Rates on Horizontal Tubes and Tube Banks, Ph.

Thesis, Univ. of Bristol, Bristol. In this case a complete model requires inclusion of vapour velocity in the prediction of both retention angle and heat transfer for the exposed parts of the fin and tube surface. The combined effects of surface tension, gravity and vapour shear stress on condensation on integral Cited by: Due to the complex geometry of shell-and-tube condensers, the heat transfer is controlled by the combined effects of tube surface geometry, condensate inundation from the tubes above, and condensing vapour velocity (vapour shear effects).

Therefore, the prediction of the condensing heat transfer coefficients becomes very by: Recommended shell and tube side velocities values are listed below, the values can be used for preliminary design purpose when designing shell and tube heat exchangers, these are guidelines that are in place as lower velocities can cause fouling issues and very high velocities can cause erosion issues.

the horizontal condenser tube N in. in outside diameter and 3 ft. long, housed in a &in. shell. The limited surface and large shell reduce the effects of vapor velocity and condensate splashing on shell-side heat transfer.

Four thermocouples made from gauge copper-congtantan wires are in- stalled circumferentially in the tube wall to measure. Condenser tubes are typically arranged in banks, so that the condensate which falls off one tube will typically fall onto a tube below. The bottome tubes in a stack thus have thicker liquid films and consequently poorer heat transfer.

heat flux will also vary with length down the tube. Since the rate of heat transfer is closely coupled to the hydrodynamic characteristics of the unit, an improved knowledge of the condensing heat-transfer coefficient is needed to predict the performance of an inside-tube condenser and to optimize the Size: 1MB.

tubesheet. The tube bundle is placed inside a large pipe called a shell, see Fig. Heat is exchanged between a fluid flowing inside the tubes and a fluid flowing outside the tubes in the shell. When the tubeside heat-transfer coefficient is as high as three times the shellside heat-transferFile Size: 1MB.

Vapour-side heat-transfer coefficients have been determined for condensation of refrigerant on low integral-fin tubes. All tubes had a diameter at the fin root of 7 mm and had rectangular. The velocity of the vapor upstream of the first tube of the bundle, which was place in a channel 66 to 26 mm wide, ranged from 0 to 4.

3 m/sec. Data were obtained on the dependence of the heat. @article{osti_, title = {Recovery of Water from Boiler Flue Effects of condensate inundation and vapor velocity on heat transfer in a condenser tube bundle book Using Condensing Heat Exchangers}, author = {Levy, Edward and Bilirgen, Harun and DuPont, John}, abstractNote = {Most of the water used in a thermoelectric power plant is used for cooling, and DOE has been focusing on possible techniques to reduce the amount of fresh water needed for cooling.

Steam-condensation heat-transfer measurements were made using a 5-tube in-line test condenser with an additional perforated tube to simulate up to 30 active tubes.

Results were obtained for smooth tubes wire-wrapped tubes and dropwise-coated tubes. device mounted on inlet side of a shell and tube heat exchanger that is used to channel flow in a mulit pass heat exchanger is. channel head.

does laminar flow transfer more heat effectively than turbulent flow. heat exchanger that uses tubular bundle to heat and flash a liquid in an oversized shell with VAPOR DISENGAGING CAVITY is called. an enhanced tube bundle is experimentally investigated at oC saturation temperature.

The enhanced tube had mm pore diameter, which had been optimized using pure R The effects of oil concentration (0 to 5%), heat flux (10 to 40 kW/m2), mass velocity (8 to 26 kg/m2 s) and vapor quality are investigated.

The data. T or F In a floating head, multi-pass, shell-and-tube heat exchanger, one side of the tube bundle is fixed to the channel head, the other side is unsecured. double pipe. The heat transfer from the solid wall to the stream of cooling channel should be balanced by the heat transfer in the coolant.

Hence. sfw ww() www w s kT T hT T δ − =− (9) where hw is the convective heat transfer coefficient of the water in the coolant channel. A thermal energy balance on the coolingFile Size: KB.

[2] Effect of FIN tube heat condenser with row coil on the cooling of TR split air conditioner. [3] Comparison of Current for row and 2 row condenser with respect to time [4] Comparison of Power for row and 2 row condenser with respect to time.

[5] Comparison of Cooling Capacity for row and 2 row condenser with respect to Size: 1MB. One of the interesting subjects in reactor design is about the condensate flow.

In this investigation, turbulent film condensation on a horizontal elliptical tube is investigated using volume of fluid (VOF) method. Heat transfer after the separation point is considered.

The turbulence model incorporated in this investigation is the realizable k-epsilon by: Return Condensate to the Boiler When steam transfers its heat in a manufacturing process, heat exchanger, or heating coil, it reverts to a liquid phase called condensate. An attractive method of improving your power plant’s energy efficiency is to increase the condensate return to the Size: KB.

Abstract. The fundamentals of condensation heat transfer for a pure vapor are reviewed. Calculational methods for the heat transfer coefficient and the pressure drop are presented for a wide variety of surface geometries and flow configurations, including shell-side condensation, in-tube condensation and direct-contact by: Condensation occurs when the temperature of vapor is reduced below its saturation temperature.

Presence of even a small amount of Non-condensable gas (e.g. air, N2, H2, He, etc.) in the condensing vapor leads to a significant reduction in heat transfer during condensation. The buildup of non-condensable gases near the condensate film inhibits the diffusion of vapor from the bulk mixture to the.

If water vapor is present in the treated gas stream or if the VOC has a high freezing point (e.g., benzene), ice or frozen hydrocarbons may form on the condenser tubes or plates. This will reduce the heat transfer efficiency of the condenser and thereby reduce the removal Size: KB.

Often its necessary to pump condensate generated in heat exchangers and other consumers widely distributed in a plant, back to the condensate receiver in the boiler house. A special challenge with hot condensate, which is often close to o F ( o C), is cavitation of the pump and the pump impeller.

Condensate Retention Effects on the Air-Side Heat Transfer Performance of Automotive Evaporator Coils ACRCCR For additional information: Air Conditioning and Refrigeration Center University of Illinois Mechanical & Industrial Engineering Dept.

West Green Street Urbana, IL () J. Kaiser and A. Jacobi July   The tube bundle would have the customary baffles to guide the vapors the length of the bundle. This would follow the accepted heat transfer algorithm used by HTRI and therefore allow for its calculation of required heat transfer area.

Instability of condensate film and capillary blocking in small-diameter-thermosyphon condensers H. Teng, P.

Cheng*, T.S. Zhao heat transfer is primarily associated with the annular that changes in thickness of the condensate film and the vapor velocity are very small over one wavelength. Full text of "A Test Facility to Measure Heat Transfer Performance of Advanced Condenser Tubes" See other formats NPSMX NAVAL POSTGRADUATE SCHOOL Monterey, California A TEST FACILITY TO MEASURE HEAT TRANSFER PERFORMANCE OF ADVANCED CONDENSER TUBES by A.C.

Beck and P.J. Marto 20 January Approved for public release; distribution unlimited. Heat Transfer - the rate of heat transfer to the iced water in the tank, the amount of ice - Duration: Engineer Thileban Explains 3, views.

Online calculator to quickly determine Condensate Recovery Pipe Sizing for Condensate Recovery Line by Velocity. Includes 53 different calculations. Equations displayed for easy reference. Modeling water vapor and heat transfer in the normal and the intubated airways.

Tawhai MH(1), Hunter PJ. Radial distribution of heat, water vapor, and velocity in the airway are described by power-law equations. Solution of the time-dependent system of equations yields dynamic airstream and mucosal temperatures and air by: operating conditions of the heat transfer effectiveness for the horizontal tube bundle and the tubes were arranged as inline.

Also, experimental study of falling film evaporation heat transfer outside horizontal tubes was studied by Yang and Shen [4]. They studied experimentally the effect of the flow density, evaporation temperatures.

ANALYSIS OF HEAT TRANSFER IN AIR COOLED CONDENSERS Sigríður Bára Ingadóttir surface condenser and a cooling tower, it results in a higher capital cost than the tube bundle. If steam travels up this row it gets condensed and flows back downAuthor: Sigríður Bára Ingadóttir. If you want a midnight no heat call, use any of the factory supplied neutralisers.

They often block up. We make our one with a Rubbermaid PVC bin and marble chips. The marble chips will last many years. We have not changed any in 10 years and had not one call back for a blocked condensate line.

The condensate has the same acidity as lemon juice. RE: Nozzle position (tubeside) in condenser with 8 passes vertical H bundle layout Christine74 (Mechanical) 19 Oct 17 Also note that the bypass you're talking about would only occur in the middle three tube rows, so the effects are limited and it wouldn't have much of an impact on the thermal design in any case.

Experimental Investigation of Tube Bundle Wetting Influence on Heat Transfer Intensity g r x x r F Q q w w w = =. =β(′′−) (2) Q!w − heat flux of evaporation or condensation, W F − heat exchange surface, m2 g!w − specific mass flow rate of vapor evaporated from water surface, kg/m 2s r − evaporation latent heat of water at temperature tgr, J/kg.

The second edition adds the following new information: introductory material on heat transfer enhancement; an application of the Bell-Delaware method; new correlation for calculating heat transfer and friction coefficients for chevron-type plates; revision of many of the solved examples and the addition of several new ones.-MEMagazine.

Read more. This article presents an analysis methodology that can be used to calculate the thermal resistance of a vertical downward facing vapor condenser plate-fin heat sink, i.e.

a heat sink in which the plate-fins extend downward from a horizontal base into a coolant vapor region and whose function it is to condense this vapor into liquid condensate. The terms of equation are, from left to right, the overall heat transfer resistance, the air-side heat transfer resistance, the heat transfer resistance of the heat exchanger tube, and the refrigerant-side heat transfer resistance.

The overall heat transfer resistance is based on a theoretical conductance Ut and a theoretical area At. The. Tc=K. An air gap between the heat pipe heat exchanger and the tube where the simulation of heat transfer is assumed to be the key process is discussed.

The end results of the air outlet of the evaporator and condenser with the effect of the heat pipe heat exchanger attached to it File Size: KB.

Abstract The effects of liquid load, tube diameter, evaporation boiling point, condensation temperature difference and steam flow velocity on the heat-transfer film .Tube bundle heat exchangers are primarily suited for heat transfer between various liquids and gases with or without phase change.

Excellent results have been obtained using water, thermal oil, wet steam etc. to warm or cool liquids and gases. The standard series consists of 6 sizes with heat transfer surfaces ranging from to m2.the eddy diffusivity effect decreased the mean heat transfer coefficient with an increase in the variation amplitude of the wall temperature.

Hu et al. () studied turbulent film condensation on an isothermal inclined elliptical tube in terms of the local condensate film thickness and the heat transfer characteristics.