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Friday, July 31, 2020 | History

2 edition of A feasibility study of heat transfer improvement in marine stream condensers found in the catalog.

A feasibility study of heat transfer improvement in marine stream condensers

by Harry Thomas Search

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Published .
Written in English

    Subjects:
  • Mechanical engineering

  • Edition Notes

    SeriesNPS69-77-001 (series)
    ContributionsMarto, P. J.
    The Physical Object
    Paginationp. ;
    ID Numbers
    Open LibraryOL25410548M

    The bottome tubes in a stack thus have thicker liquid films and consequently poorer heat transfer. The correlation is adjusted by a factor for the number of tubes, becoming for the Nth tube in the stack (MSH , F ) Splashing of the falling fluid further reduces heat transfer, so some authors recommend a different adjustment. Four of the cooling systems use ammonia as a heat transfer medium between the steam condenser and the heat rejection tower, while the fifth uses the condenser cooling water for heat transport.

    Determination of surface convective heat transfer coefficients by CFD Adam Neale1 Dominique Derome1, Bert Blocken2 and Jan Carmeliet2,3 1) Building Envelope Performance Laboratory, Dep. of Building, Civil and Environmental Engineering, Concordia University, de Maisonneuve blvd West, Montreal, Qc, H3G 1M8, corresponding author e-. Abstract. We describe breakthrough results obtained in a feasibility study of a fundamentally new architecture for air-cooled heat exchangers. A longstanding but largely unrealized opportunity in energy efficiency concerns the performance of air-cooled heat exchangers used in air conditioners, heat pumps, and refrigeration equipment.

    C. Zhang and Y. Zhang, , "Sensitivity Analysis of Heat Transfer Coefficient Correlations on the Predictions of Steam Surface Condensers," Heat Transfer Engineering, Vol, No.2, pp C. Zhang, , "Numerical Modeling Using a Quasi-Three-Dimensional Procedure for Large Power Plant Condensers," ASME Trans. Journal of Heat Transfer. Unexposed Side Heat Transfer Coefficient 18 Fire Boundary Conditions 21 CHAPTER 3: FINITE DIFFERENCE MODELLING OF A PIPE 1-D Formulation of FDM for a Multi-layer Pipe 27 2-D Formulation of FDM for a Multi-layer Pipe 31 Internal Heat Exchange 34 CHAPTER 4: MODELS FOR POLYMER COMPOSITES AND INTUMESCENT COATINGS Introduction 39File Size: 8MB.


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A feasibility study of heat transfer improvement in marine stream condensers by Harry Thomas Search Download PDF EPUB FB2

A Feasibility Study of Heat Transfer Improvement in Marine Steam Condensers by Harry Thomas Search Lieutenant, United States Navy B.S., Bucknell University, Submitted in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN MECHANICAL ENGINEERING from the NAVAL POSTGRADUATE SCHOOL December S YOb 2 L c.

/ ABSTRACT A survey of condenser design principles and heat transfer augmentation schemes. ReportNumberNPS NAVALPOSTGRADUATESCHOOL Monterey,California THESIS 1 AFEASIBILITYSTUDY OFHEATTRANSFERIMPROVEMENTIN MARINESTEAMCONDENSERS by HarryThomasSearch December ThesisAdvisor: Approvedforpublicrelease;distributionunlimited.

Preparedfor NavalSeaSystemsCommand. ORCON 1 is a significant contribution to the heat transfer research effort in the field of steam condenser performance analysis [18,53,54]. It performs a thermal analysis on steam condensers.

Research PaperExperimental study on heat transfer characteristics of a condenser in the presence of air. Experimental study on heat transfer characteristics of a condenser in the presence of air.

Author links open overlay panel. GuangyaoLiua JinshiWangb TengfeiChena JipingLiua Junjie by: 2. The transition of filmwise condensation into dropwise makes it possible to increase the heat-transfer coefficient by 50–70% because of hydrophobization of outside surfaces of the steam side that results in vacuum extension at minimum operating costs.

The resulting data are verified by laboratory investigations and full-scale by: 1. Article Summary. Condensing steam against the surface of clean, cold tubes of a water cooled condenser ought to produce an excellent heat transfer coefficient (U value).

The author has observed coefficients as high as Btu/h/ft2/°F. But. Introduction to Condenser. A condenser or evaporator is a heat exchanger, allowing condensation, by means of giving off, or taking in heat respectively.

The construction principle: Refrigerant and air will be physically separated, at air conditioner condenser, and by: 1. condensers with the vapor outside the horizontal tubes. There are many papers which investigated experimentally the FCHT characteristics as the function of mass flux, heat flux, saturation temperature and tube diameter.

Laohalertdecha and Wongwises () studied the heat transfer coefficient (HTC) of. steam data should be useful as a guide in analyzing the relatively small amount of high- cost alkali-metal- condensing data as it becomes available.

local heat-transfer data for steam condensing inside a tube. of condensing heat-transfer coefficients and their variation with distance down the tube were Size: 1MB.

For condensers limited by the present duty, however, the options have been historically limited to rebundling the whole condenser with a larger surface area design and perhaps changing the tube material to a material with a higher heat transfer : Warren C.

Welch, Timothy J. Harpster, Joseph W. Harpster. condensation heat transfer coefficient hv on inner surface of tube can be obtained.

Nusselt Theory: Nusselt [1] in is published the first article about laminar film condensation, where Nusselt analytically expressed condensation heat transfer coefficient dependent on mass of steam condensate. Condensation heat transfer. A new correlation used to account for the inundation effect on the prediction of heat transfer between steam vapor and cooling water in tube-and-shell condensers is proposed in this work.

Conduction Heat Transfer Robert F. Boehm Introduction Conduction heat transfer phenomena are found throughout virtually all of the physical world and the industrial domain. The analytical description of this heat transfer mode is one of the best understood.

Some of the bases of understanding of conduction date back to early history. Rayleigh Flow – flow with heat transfer in a frictionless constant area pipe. Combined Friction and Heat Transfer in a constant area pipe.

Effect of friction and area change using an adiabatic converging-diverging nozzle. Combined Friction and Heat Transfer in the converging-diverging by: 2. •A variety of high-intensity heat transfer processes are involved with combustion and chemical reaction in the gasifier unit itself.

•The gas goes through various cleanup and pipe-delivery processes to get to our heat transfer processes involved in these stages are generally less intense. Condensers Special heat-transfer devices employed to liquefy vapors by removing their latent heat are called condensers.

The latent heat is removed by absorbing it in a cooler liquid called the coolant. Since the temperature of the coolant is increased in a condenser, the unit also acts as a heater.

Classification of CondensersFile Size: KB. This study presents a proposal of a combined scheme for applying a vapor compression refrigeration system to cool the condenser of a steam plant. In this scheme the refrigerant (mostly liquid) leaving the throttle valve of the refrigeration system is circulated through the pipes of the shell and tube condenser, while the steam exhausting the Cited by: 3.

Heat transfer by natural convection apparatus Parallel flow/counter flow heat exchanger apparatus Heat transfer from pin-fin apparatus Stefan Boltzmann apparatus Thermal conductivity of metal rod apparatus Study of two phase flow apparatus Experiment on Transient heat File Size: 1MB.

THERMAL DESIGN OF HEAT-TRANSFER EQUIPMENT INTRODUCTION TO THERMAL DESIGN Design methods for several important classes of process heat-transfer equipment are presented in the following portions of Sec.

Mechanical descriptions and specifications of equipment are given in this section and should be read in conjunction with the use of this File Size: 9MB.

In processes with condensation of steam-to-gas compositions the heat transfer can be several times less than that of the cooling liquid. An intensification of the condensation is therefore required.

Professors V.G. Rifert and H.F. Smirnov have carried out research on heat transfer enhancement by condensation and boiling for over 30 years and Cited by: 5.

condensation of steam-air mixtures in a horizontal effects of inlet fluid temperature,air mass concentration and tube diameter on the rate of condensation were investigated. It was found that condensation heat transfer coefficient drops by approximately 50% within an air mass of 3% and there after the drop in the heat transfer.Section provides an introduction to heat transfer in furnaces, then the subsequent three sections are devoted to heat transfer in different types of boilers, including grate-firing boilers.THERMAL CONDUCTION HEATING FOR IN-SITU THERMAL DESORPTION OF SOILS by George L.

Stegemeier GLS Engineering, Inc. and Harold J. Vinegar Shell E&P Technology Applications and Research Co. ABSTRACT In-Situ Thermal Conduction Heating is a soil remediation process in which heat and vacuum are applied simultaneously to subsurface soils, either with File Size: 2MB.