A systematic study of influence of process variables on the overall heat transfer coefficient in a shell and tube heat exchanger

  • Naveed Ul Hasan Syed Deptt. Of Chem. Engg. UET Peshawar.
  • Qurat ul Ain Deptt. Of Chem. Engg. UET Peshawar.
  • Muddasar Habib Deptt. Of Chem. Engg. UET Peshawar.
  • Naseer Ahmed Khan Deptt. Of Chem. Engg. UET Peshawar.
  • Sultan Ali Deptt. Of Chem. Engg. UET Peshawar.
Keywords: Energy conservation, Heat flux, Modeling, Segmental baffles, Thermal boundary layer

Abstract

A systematic experimental study was carried out on a shell and tube heat exchanger (STHx) to examine the influence of process variables such as hot and cold water flow rate, and the hot water inlet temperature on the overall heat transfer coefficient (U). The results show that the U increased with increasing the hot water and cold water flow rates. Similarly, the increase in hot water inlet temperature, improved heat transfer rate. It was observed that the increase in the U by increasing the cold water flow rate was significantly higher than with increasing the hot water flow rate. Under similar process conditions, at 36 oC hot water inlet temperature, the U increased from 709.96 to 1045.50 W/(m2.oC) with the increasing cold water flow rate from 0.75 to 2.5 L/min. While for the hot water case, the U increased from 709.96 to 940.43 W/(m2.oC) for the corresponding hot water flow rate. An empirical model correlating the outlet temperature of the STHx fluids with the inlet conditions has also been proposed. The proposed model was used to calculate the outlet temperatures of the hot and cold water and the heat flux. The model predictions were compared with the experimental results and a good agreement was found

Author Biographies

Naveed Ul Hasan Syed, Deptt. Of Chem. Engg. UET Peshawar.

Deptt. Of Chem. Engg. UET Peshawar.

Qurat ul Ain, Deptt. Of Chem. Engg. UET Peshawar.

Deptt. Of Chem. Engg. UET Peshawar.

References

Aghareed, M.T., El-Rifai, M.A., El-Tawil, Y.A., Abdel-Monen, R.M., (1991), “A new dynamic model for shell and tube heat exchangers”, Energy Conservation Management, 32, 439 – 446. https://doi.org/10.1016/0196-8904(91)90005-4
Andrzejczyk, R., Muszynski, T., (2018), “An experimental investigation on the effect of new continuous core-baffle geometry on the mixed convection heat transfer in shell and coil heat exchanger”, Applied Thermal Engineering, 136, 237 – 251. https://doi.org/10.1016/j.applthermaleng.2018.03.003
Butterworth, D., (2002), “Design of shell and tube heat exchangers when the fouling depends on local temperature and velocity”, Applied Thermal Engineering, 22, 789 – 801. https://doi.org/10.1016/S1359-4311(02)00025-X
Cvengros, J., Lutisan, J., Micov, M., (2000), “Feed temperature influence on the efficiency of a molecular evaporator”, Chemical Engineering Journal, 78, 61- 67. https://doi.org/10.1016/S1385-8947(99)00159-X
Du, B.C., He, Y.L., Qiu, Y., Liang, Q., Zhou, Y.P., (2018), “Investigation on heat transfer characteristics of molten salt in a shell-and-tube heat exchanger”, International Communications in Heat and Mass Transfer, 96, 61 – 68.
https://doi.org/10.1016/j.icheatmasstransfer.2018.05.020
Kapale, U.C., Chand, S., (2006), “Modeling for shell-side pressure drop for liquid flow in shell-and-tube heat exchanger”, International Journal of Heat and Mass Transfer, 49, 601 – 610. https://doi.org/10.1016/j.ijheatmasstransfer.2005.08.022
Lachi, M., EL Wakil, N. and Padet, J., (1996), “The time constant of double pipe and one pass shell-and-tube heat exchangers in the case of varying fluid flow rates”, Heat & Mass Transfer, 40, 2067 – 2079. https://doi.org/10.1016/S0017-9310(96)00274-8
Mandavgane, S.A., Siddique, M.A., Dubey, A. and Pandharipande, S.I., (2004), “Modeling of heat exchangers: Using artificial neural network”, Chem. Eng. World, 75 – 80.
Miranda, V., Simpson, R., (2005), “Modeling and simulation of an industrial multiple effect evaporator: tomato concentrate”, Journal of Food Engineering, 66, 203 – 210. https://doi.org/10.1016/j.jfoodeng.2004.03.007
Montgomery, D.C., (2003), “Design and Analysis of Experiments”. John Wiley & Sons, New York, 3rd Edition, 270 – 569.
Parikshit, B., Spandana, K.R., Krishna, V., Seetharam, T.R., K.N. Seetharamu, K.N., (2015), “A simple method to calculate shell side fluid pressure drop in a shell and tube heat exchanger”, International Journal of Heat and Mass Transfer, 84, 700 – 712. https://doi.org/10.1016/j.ijheatmasstransfer.2015.01.068
Ren, Y., Jiang, Y., Cai, W., Wu, Z., Li, S., (2018), “Numerical study on shell-side saturated boiling heat transfer in spiral wound heat exchanger”, Applied Thermal Engineering, 140, 657 – 670. https://doi.org/10.1016/j.applthermaleng.2018.04.137
Syed N.H., Sultan Ali, (2011), “An experimental investigation of heat transfer coefficient in vertical tube rising film evaporator”, Mehran University Research Journal of Engineering & Technology, 30 (4), 539 – 548.
Thirumarimurugan, M., Kannadasan, T., (2008), “Performance Analysis of Shell and Tube Heat Exchanger Using Miscible System”, American Journal of Applied Sciences, 548 – 552. https://doi.org/10.3844/ajassp.2008.548.552
Vera-Garcia, F., Garcia-Cascales, J.R., Gonzalvez-Macia, J., Cabello, R., Llopis, R., Sanchez, D., Torrella, E., (2010), “A simplified model for shell-and-tubes heat exchangers: Practical application”, Applied Thermal Engineering, 30, 1231 – 1241. https://doi.org/10.1016/j.applthermaleng.2010.02.004
Wang S., Wen, J., Li, Y., (2009), “An experimental investigation of heat transfer enhancement for a shell-and-tube heat exchanger”, Applied Thermal Engineering, 29, 2433 – 2438. https://doi.org/10.1016/j.applthermaleng.2008.12.008
Yanik, M., Webb, R., (2004), “Prediction of two-phase heat transfer in a 4-pass evaporator bundle using single tube experimental data”, Applied Thermal Engineering, 24, 791 – 811. https://doi.org/10.1016/j.applthermaleng.2003.10.023
Published
2018-12-31
How to Cite
Syed, N. U., Ain, Q., Habib, M., Khan, N., & Ali, S. (2018, December 31). A systematic study of influence of process variables on the overall heat transfer coefficient in a shell and tube heat exchanger. JOURNAL OF ENGINEERING AND APPLIED SCIENCES, 37(2). https://doi.org/https://doi.org/10.25211/jeas.v37i2.2895