THE INFLUENCE OF PLATE CONFIGURATION AND CUO NANOFLUIDS ON HEAT TRANSFER AND PRESSURE DROP IN PLATE HEAT EXCHANGERS

Amina Alikhan; Hadi Mery; sadiq sadiq; Osamah Mohammed

doi:10.30572/2018/KJE/160335

Authors

Amina H. Dhaef Alikhan Mechanical Engineering Department, Faculty of Engineering, Wasit University, Iraq
Hadi O. Mery Mechanical Engineering Department, College of Eng., Wasit University,Wasit, Iraq
sadiq sadiq Department of Aeronautical Technical Engineering, Technical Engineering College of Najaf, Al-Furat Al-Awsat Technical University, Iraq
Osamah M. Mohammed Mechanical Engineering Department, College of Eng., Wasit University,Wasit, Iraq.

DOI:

https://doi.org/10.30572/2018/KJE/160335

Keywords:

Plate heat exchanger, Overall heat transfer, CuO/water nanofluid, Number of plates, Thermal conductivity enhancement

Abstract

Recent studies have highlighted the impact of nanofluids in enhancing the rate of heat transfer, particularly by improving the plate heat exchangers (PHE) thermal performance. The problems of using nanofluids at high concentrations in plate heat exchangers such as sedimentation, blockage, and cost prompted researchers to try new techniques to improve the efficiency of heat exchangers by using low concentrations of nanofluids. Among these techniques is increasing the number of plates for the plate heat exchanger. Few experimental studies have been conducted in this field , the number of plates used did not exceed 16 plates. Thus, this study examines the increasing of plate numbers effect on plate heat exchangers performance with CuO nanofluids at 1%wt to avoid the problems of using high concentrations to verify the possibility of investigating whether increasing the number of plates may cause noticeable problems in pressure drop when exceeding a certain number and the possibility of finding alternative methods to achieve the best thermal performance. And achieve a balance between improving the design and physical properties of nanofluids at low concentrations. The experiments aim to determine the optimal heat exchanger configuration (plate numbers) that achieves high thermal performance while minimizing the pressure drop and pumping power. Four different configurations (8, 12, 16, and 24 plates) were experimentally investigated. Results revealed that an increase in plate number led to directly proportional enhancements in the rate of heat transfer and the Nusselt number. In the first three configurations, the overall heat transfer coefficient improved by 10%, 17%, and 19%, respectively, with an imperceptible increase in pumping power and pressure. Effectiveness improvements of 7%, 9%, and 12% were achieved with 8, 12, and 16 plates, respectively, while using 24 plates provided the highest effectiveness improvement of approximately 24%. However, the 24-plate configuration showed a remarkable increase in the pressure drop and pumping capacity, which has an adverse effect on the overall heat exchanger performance

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