STEADY AND UNSTEADY HEAT TRANSFER IN MEMBRANE WATER- WALL OF POWER PLANT BOILERS

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SHOKOUHMAND H.; PIRMOHAMMADI A.

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Journal: Year:2001 | Volume:35 | Issue:3 (73) Page(s): 307-326

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Title

STEADY AND UNSTEADY HEAT TRANSFER IN MEMBRANE WATER- WALL OF POWER PLANT BOILERS

Author(s)

SHOKOUHMAND H. | PIRMOHAMMADI A. | Issue Writer Certificate

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Abstract

In this paper steady and unsteady conductive heat transfer in membrane walls of the boilers have been investigated. The furnace walls of the utility and large industrial boilers are constructed from membrane walls. The membrane walls consisting of parallel tubes connected longitudinally by fins have been considered. These types of the wall Insulated outside and exposed to the furnace on the other, constitute an effective means of transferring heat from furnace to the water circulating inside the tubes. Analysis of heat transfer in membrane walls. assemblies is an important step in design and sizing of the utility boiler's furnace. Because of geometric complexity and discontinuous properties of the fin-tube assembly, a numerical method is used, and for a simplified case of steady-state and no welding angle an analytical approach has been performed. The effect of the welding angle as well as fin width and thickness upon temperature distribution in the membrane walls have been considered. To obtain heat flux on the furnace sector of the tubes, the view factors between the flame considered as a parallel plane and the membrane walls has been evaluated. Also for the "Start up" of the boiler the distribution of temperature in membrane water-wall is obtained by finite element method and the effect of the tube thickness, fin thickness and width have been studied. It is also shown that the fin effectiveness as well as the insulated sector of the tube are closely related.

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APA: Copy

SHOKOUHMAND, H., & PIRMOHAMMADI, A.. (2001). STEADY AND UNSTEADY HEAT TRANSFER IN MEMBRANE WATER- WALL OF POWER PLANT BOILERS. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), 35(3 (73)), 307-326. SID. https://sid.ir/paper/535587/en

Vancouver: Copy

SHOKOUHMAND H., PIRMOHAMMADI A.. STEADY AND UNSTEADY HEAT TRANSFER IN MEMBRANE WATER- WALL OF POWER PLANT BOILERS. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN)[Internet]. 2001;35(3 (73)):307-326. Available from: https://sid.ir/paper/535587/en

IEEE: Copy

H. SHOKOUHMAND, and A. PIRMOHAMMADI, “STEADY AND UNSTEADY HEAT TRANSFER IN MEMBRANE WATER- WALL OF POWER PLANT BOILERS,” JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), vol. 35, no. 3 (73), pp. 307–326, 2001, [Online]. Available: https://sid.ir/paper/535587/en

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