A Computational Solution of Melting Process inside a Sphere Towards the Latent Heat Storage in a Solar Air Heater

Authors

  • Tran Van Hung Faculty of Mechanical engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet, District 10, Ho Chi Minh City, Vietnam
  • Tu Thien Ngo Jeong-Woo Industrial Machine Co., Ltd., 253,5 Sandan-ro, Susin-myeon, Dongnam-gu, Cheonan-si 31251, Republic of Korea
  • Nguyen Minh Phu Faculty of Heat and Refrigeration Engineering, Industrial University of Ho Chi Minh City (IUH), 12 Nguyen Van Bao, Go Vap District, Ho Chi Minh City, Vietnam

DOI:

https://doi.org/10.37934/cfdl.17.7.6173

Keywords:

Enthalpy method, spherical coordinate, melting fraction, paraffin waxes, energy storage

Abstract

Latent heat storage using the phase change material (PCM) in a solar air collector is a measure to extend the collector's operating time during off sunshine period because air cannot store heat. In this paper, the melting prediction of spherical PCM under hot air convection is established by a one-dimensional unsteady enthalpy equation and solved by the finite difference method. The numerical results are compared with published data to confirm the accuracy. The independent parameters to investigate the charging include sphere diameter, air temperature, air velocity and initial temperature of PCM. The effects of air temperature and sphere diameter are significant on the melting rate of PCM. When the diameter increases by 2.5 times, the time to complete liquefaction increases by 5 times. At an air temperature of 70C, the required liquefaction time is 75 mins for a 40 mm diameter sphere.

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Author Biographies

Tran Van Hung, Faculty of Mechanical engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet, District 10, Ho Chi Minh City, Vietnam

tvhung@hcmut.edu.vn

Tu Thien Ngo, Jeong-Woo Industrial Machine Co., Ltd., 253,5 Sandan-ro, Susin-myeon, Dongnam-gu, Cheonan-si 31251, Republic of Korea

ngott@jimc.co.kr

Nguyen Minh Phu, Faculty of Heat and Refrigeration Engineering, Industrial University of Ho Chi Minh City (IUH), 12 Nguyen Van Bao, Go Vap District, Ho Chi Minh City, Vietnam

nguyenminhphu@iuh.edu.vn

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Published

2025-01-31

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