Numerical Investigation on Charging Discharging of a PCM Using PV and Thermal Oil for Injera Baking Application.
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Date
2023-06
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Addis Ababa University
Abstract
Millions of Ethiopians rely on bio
mass, charcoal, and animal dung to supply their energy
demands. All of this energy is used to bake injera, more than 50%. This traditional biomass
based baking has an impact on women's and children's he alth, energy, and ability to attend
school. Due to its abundant and readily accessible renewable energy source, solar energy had
been considered to be a good alternative for cooking. However, because of its intermittent
nature, there is a mismatch between the load and the solar energy that is available for the
baking purpose, so a thermal storage system that provides the necessary energy has been
integrated.
T
his study investigates th e thermal characteristic of the charging and discharge processes and
main heat transfer processes in the injera baking system with PV which was integrated with the
thermal storage system
T
his study was conducted beginning with review ing related papers, system design, data
collection and data analysis in addition, performed m athematical and numerical model s and
numerical simulation was conducted using a finite difference computational model for the
thermal storages that was PCM and thermal oil The thermal oil was used to store energy and
to transfer heat, furthermore, the dev eloped computational models are analyzed using MA TLAB
programming software.
F
rom the numerical simulation result by using solar radiation data of Addis Ababa showed that
the thermal storage has the capacity to store about 3 3 MJ during charging using const ant heat
flux which was from the PV The amount of energy discharged from the PCM was 13.1 MJ and
from the thermia oil was 3 .5 0 MJ by using natural convection heat transfer and the discharging
and overall efficiency of the system w ere about 50.2 and 46.67 respectively. Also, the
baking pan surface temperature stayed between 220 o c and 1 46.4
o c for about three hours . T his
result was compared with different papers and it can be concluded that the numerical ly
investigated solar powered Injera baking integrated with thermal storage showed a promising
result.
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Keywords
PCM, Thermal Energy Storage System,PV, Thermal Oil