INTEGRATION OF THERMAL ENERGY STORAGE MATERIALS IN HEAT PIPE EVACUATED TUBE SOLAR COLLECTOR SYSTEMS FOR ENHANCED SOLAR THERMAL PERFORMANCE
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Published:2024
Issue:6
Volume:16
Page:59-85
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ISSN:1940-2503
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Container-title:Computational Thermal Sciences: An International Journal
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language:en
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Short-container-title:Comput Thermal Scien
Author:
Hachim Dhafer Manea,Eidan Adel A.,Alshukri Mohammed J.,Al-Fahham Mohamed,Al-Sahlani Assaad,Al-Manea Ahmed,Al-Rbaihat Raed,Alahmer Ali
Abstract
This study investigates integrating thermal energy storage materials (TESM) with a heat pipe evacuated tube solar
collector (HP-ETSC) in a water tank. Three TESMs (paraffin wax, RT27, and RT35) were examined numerically
using COMSOL software, and experiments were conducted. Different design parameters were discussed, including
water tank thickness, TESM tank thickness, TESM types, flow rate, and environmental conditions. The integration
of TESM into the HP-ETSC allows the evaluation of various thermal performances, including average water tank
temperature, hot water outlet temperature, and duration of hot water availability after sunset. The findings indicate
a maximum temperature difference of approximately 37°C at 13:00 on March 19 without TESM. However, with
RT35, the temperature difference is around 34.27°C, and with RT27, it is approximately 33.4°C. Additionally, the
temperature difference is approximately 2°C higher when TESM is not utilized during the three months at sunset.
These results demonstrate improved thermal performance compared to a similar system without TESM. Thermal
energy transmission from TESM to water is relatively low, resulting in slightly higher outlet water temperature at
night. During cloudy periods, RT27 and RT35 TESM types maintain their melting temperature from 11:00 to 20:00.
A water storage tank thickness of 35 mm yields the highest temperature difference with RT27 and RT35 TESM.
Increasing TESM thickness allows for more mass and latent heat storage, leading to up to 3.5 hours of heat release. On
a mostly sunny day, such as January 9, the HP-ETSC stops heat release around 16:30 without TESM, while the TESM
plates prolong the discharge duration by three hours.
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