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Fundaments Lab 2

Fundaments Lab 2 - Heat Transfer in Shell and Tube Heat...

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Heat Transfer in Shell and Tube Heat Exchangers Chemical Engineering Fundamentals Laboratory ChE 378 Professor David Corti May 4, 2009 David Belair Sara Belander Santhosh Varadarajan The specific purpose of this experiment is to solve for the heat transfer coefficients of the tube side and shell side for both co-current and counter-current concentric-tube heat exchangers. The method to solve for these
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constants if provided by the modified Wilson plot method which utilizes linear regression analysis to solve for the exponents ‘m’ and ‘n’ in the following dimensionless equation 1. = Nu BRemPrn 2. where Re>10 4 and 0.7<Pr<100. The relevant equation describing a conduit flow heat exchanger is the Dittus Boelter Equation given below, which is in the same form as equation one with values specified for the constant ‘B’ and the exponents ‘m’ and ‘n’: 3. . = = . . 1 1 Nu BRemPrn 0 0023Re0 8Prn 4. The power term ‘n’ is specified as 0.3 for a fluid undergoing cooling is specified as 0.4 for a fluid undergoing heating. 5. We can express the total thermal resistances as follows: 6. = = + Rtotal 1UA 1htubeAi C1' 7. = + C1 ∆rwallAikwallAwall AihshellAo 8. The tube wall thermal resistance will remain essentially constant throughout the analysis, thus we lump both this resistance and the shell side thermal resistance into the constant ‘C 1 ’ . The value of h shell is constant throughout the analysis, and this value was calculated by finding the Reynold’s Number for the shell-side stream and the corresponding Prandtl Number, with the result from equation 1.1 giving the convective heat transfer coefficient for the shell side. However, the value of h tube varies with each flow rate. A value of the Reynold’s Number is calculated for each flow rate, and the analysis follows the calculation of the exponent ‘m’ for equation
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Fundaments Lab 2 - Heat Transfer in Shell and Tube Heat...

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