Effect of inclination angle on the performance of a shell and tube heat storage unit – An experimental study. (5th February 2017)

• Record Type: Journal Article
• Authors: Kousha, N.; Hosseini, M.J.; Aligoodarz, M.R.; Pakrouh, R.; Bahrampoury, R.
• Is Part Of: Applied thermal engineering. Volume 112(2017:Feb.)
• Page Start: 1497
• Page End: 1509
• Publication Date: 2017-02-05
• Subjects: PCM -- Inclination angle -- Natural convection -- Thermal conduction; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2016.10.203
• Languages: English
• ISSNs: 1359-4311

Abstract

Highlights: Melting and solidification processes of a PCM are experimentally studied in a shell and tube heat exchanger. The system performance is studied when the system inclination angle varies for different Stefan numbers. The rate of heat transfer during melting is the most when the heat exchanger is positioned horizontally. The vertical heat exchanger can absorb the thermal energy during solidification better than other inclinations. The temperature different between the sections are much less when the heat exchanger is positioned horizontally. Abstract: This study includes experimental investigation on the performance of a shell and tube heat exchanger subjected to inclination angle variation. Paraffin RT35 is used as phase change material (PCM). The investigation was performed for modified Stefan numbers of 0.47, 0.53 and 0.59 and inclination angle rang from 0° to 90°. The Reynolds number is about 770 and the Grashof number is in the range of 4.6 × 10 4 –5.8 × 10 4 which indicated that the flow is laminar. Results show that as the inlet temperature increases melting process accelerates and complete melting time reduces. Results also indicated that the rate of melting process in the first half of the process is more in the horizontal system with respect to the other inclinations. It is also revealed that the angle's variation doesn't affect the rate of heat transfer and the temperature during solidification which is due to the domination of conduction in this process. Results also clarified that during melting, the rate of heat transfer of the horizontal system is more than that of vertical, however the reverse is true for the solidification. It is also concluded that the average temperature of the horizontal heat exchanger sections closer to the inlet is more than the section nearer to outlet. However, when the 30°, 60° and 90° cases are considered, the PCM average temperatures of the sections nearer to the outlet are more.