By Sadik Kakaç, Hongtan Liu, Anchasa Pramuanjaroenkij
Researchers, practitioners, teachers, and scholars all welcomed the 1st version of warmth Exchangers: choice, score, and Thermal layout for accumulating into one position the essence of the data they need-information previously scattered in the course of the literature. whereas keeping the fundamental ambitions and renowned good points of the bestselling first variation, the second one version contains major advancements and modifications.New within the moment Edition:Introductory fabric on warmth move enhancementAn program of the Bell-Delaware methodNew correlation for calculating warmth move and friction coefficients for chevron-type platesRevision of the various solved examples and the addition of a number of new onesThe authors take a scientific method of the topic of warmth exchanger layout, targeting the basics, choice, thermohydraulic layout, layout tactics, and the score and operational demanding situations of warmth exchangers. It introduces thermal layout by way of describing a number of different types of single-phase and two-phase movement warmth exchangers and their purposes and demonstrates thermal layout and ranking procedures via labored examples, workouts, and scholar layout initiatives. a lot of the textual content is dedicated to describing and exemplifying double-pipe, shell-and-tube, compact, gasketed-plate warmth exchanger kinds, condensers, and evaporators.
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Extra resources for Heat Exchangers: Selection, Rating, and Thermal Design, Second Edition
Sample text
Ft of chimney height. 26) A new underground pipeline at a chemical complex is to be placed parallel to an existing underground pipeline. 9 cm, carries a fluid at 283 K and is not insulated. 4cm and will carry a fluid at 335 K. 76 m. 7 W / m . K. In order to determine whether the new line will need to be insulated, calculate the rate of heat transfer between the two pipelines per meter of pipe length if the new line is not insulated. For the purpose of this 1/40 HEAT C O N D U C T I O N calculation, neglect the resistances of the pipe walls and the convective resistances between the fluids and pipe walls.
Isolation of the air in these small spaces prevents convection currents from forming within the material, and the relatively low thermal conductivity of air (and other gases) thereby imparts a low effective thermal conductivity to the material as a whole. Insulating materials with effective thermal conductivifies much less than that of air are available; they are made by incorporating evacuated layers within the material. 1/32 HEAT C O N D U C T I O N References 1. Fourier, J. , The Analytical Theory of Heat, translated by A.
39) The analogous problem in cylindrical geometry is that of an infinitely long solid cylinder of radius, R, initially at uniform temperature, To. This situation will be approximated in practice by a finite cylinder whose length is much greater than its diameter, or whose ends are insulated. 0534e -749F~ + . . 43) Here A is the circumferential area, which is equal to 2:rR times the length of the cylinder. 6. 0676e -888F~ + ... 43). 6. 11 A 12-ounce can of beer initially at 80~ is placed in a refrigerator, which is at 36~ Estimate the time required for the beer to reach 40~ Solution Application to this problem of the equations presented in this section requires a considerable amount of approximation, a situation that is not uncommon in practice.
