Numerical study of some influencing parameters on melting process of phase change storage units integrated with a solar water heater

  • Khalid Ahmad Joudi Mechanical Engineering Department, Baghdad University, Baghdad, Iraq.
  • Aouf Abdulrahman Al-Tabbakh Mechanical Engineering Department, Mustansiriyah University, Baghdad, Iraq.

Abstract

This work theoretically analyzes the melting process of a phase change material (PCM) packed
in thermal energy storage units. The units are filled with paraffin wax and inserted in the water storage
tank of a solar water heater to improve the storage capacity. A computer program was built to simulate
the performance of the whole system during a typical day between 8 a.m. and 3:45 p.m.. The simulation
period was divided into small time intervals of 10 seconds. The Finite Difference Method (FDM) was
used to analyze the melting process of the PCM units. Each unit was discretized into a large number of
nodes forming a two dimensional grid. The effect of three PCM parameters were studied which are the
shape, volume and surface area. The cross-sectional shape included square, annular square, circular and
circular annulus bars. It was found that the circular sections provide higher melt ratio than the square
sections and that the annular sections are more effective than the solid sections. Increasing the PCM
surface area at constant PCM volume significantly increases the melt ratio for all PCM shapes. The
system equipped with PCM having the least volume operates more effectively than a system with larger
PCM volumes

Published
2019-03-19
How to Cite
AHMAD JOUDI, Khalid; ABDULRAHMAN AL-TABBAKH, Aouf. Numerical study of some influencing parameters on melting process of phase change storage units integrated with a solar water heater. JOURNAL OF ENGINEERING AND SUSTAINABLE DEVELOPMENT, [S.l.], v. 22, n. 02 Part -2, p. 47-63, mar. 2019. ISSN 2520-0917. Available at: <http://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/497>. Date accessed: 02 july 2020.