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Experimental Study on the Heat Transfer Performance in Direct Air-cooled Condenser of Power Plant

Author: XuYan
Tutor: YangYongPing
School: North China Electric Power University (Beijing)
Course: Thermal Power Engineering
Keywords: Air Cooled Condenser Serpentine finned tube Heat transfer performance Flow resistance Flow field
CLC: TK124
Type: Master's thesis
Year: 2011
Downloads: 76
Quote: 1
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Abstract


Air Cooled Condenser serpentine fin flat tube used for experimental pieces , designed and built some of the wind tunnel experiment system . Two arranged for finned tubes - vertical and inclined 30 ° and experimental study of heat transfer and flow characteristics . The synthesis of the corresponding flat tube the serpentine fins in different wind speeds convective heat transfer coefficients and flow resistance , and is intended to Nu number and f factor with Re number change relational and curves . As can be seen from the two layout Nu number and f factor curve : with increasing Reynolds number Re , Nu value increasing with increasing air speed , finned tube air-side heat exchanger capacity is also growing ; With the increase in the Reynolds number Re f values ??continue to decrease. For inclined at 30 . Arranged finned tube , fin exports flow field shooting , get the flow of its exports , by shooting the picture can be seen : the smoke into the fin space divided by the fin , forming obvious mutually parallel uniform flow, an outflow of fin space . Numerical simulation for each of the two arranged finned tube vertical and inclined 30 ° both cases the air side of the serpentine finned tube flow field can be seen from the simulation results : after fin rectifier , finned tube at the outlet of the air flow parallel to the outflow , and will maintain a long distance , the rear of the base pipe flow generation , but smaller , and the speed is lower , so its impact on the mainstream is not obvious . Adjacent word row space according to the results of the single row tube experiments and simulation flow , numerical simulation , the hot air flow distribution . The simulation results can be seen: the air flow between the adjacent word row rendering the symmetrical state into the atmospheric space , no eddy-current generation .

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Thermal Engineering Theory > Heat Transfer
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