Datum
2019Schlagwort
620 Ingenieurwissenschaften SonnenenergieLatentwärmespeicherMannitReflektor <Lichttechnik>SonnenkollektorMetadata
Zur Langanzeige
Working paper
Solar Thermal Energy Storage System
Solar Thermal Energy Storage System
using phase change material for uninterrupted on-farm agricultural processing and value addition
Zusammenfassung
Thermal energy storage technologies are gaining attention nowadays for uninterrupted supply of solar power in off-sunshine hours. An indigenized solar phase change material (PCM) system was developed and performance evaluated in the current study to efficiently store solar thermal power using a latent heat storage approach, which can be utilized in any subsequent decentralized food processing application. A 2.5 m2 laying Scheffler reflector is used to precisely focus the incoming direct normal irradiance (DNI) on a casted aluminum heat receiver (220 mm diameter) from where this concentrated heat energy is absorbed and conducted to the PCM unit by the flow of thermal oil (Fragoltherm-32 thermo-oil). During the circulation around PCM pipes inside the PCM unit, thermal oil discharges heat energy to the PCM, which undergoes change of phase from solid to liquid. Computational fluid dynamics (CFD) analysis of the PCM unit were also performed according to the actual boundary conditions, which gave satisfactory results in terms of temperature and velocity distribution. With an average DNI of 781 W/m2, the highest temperature of the receiver surface during the trials was observed at about 155 C that produces thermal oil at 110°C inside the receiver and around 48°C of PCM in the PCM unit. The heat energy losses per unit time (W) due to the lack of reflectivity from the Scheffler reflector, out-of-focus radiations at the targeted area, absorptivity of heat receiver, piping system losses, and cylinder losses (in the form of conduction, convection, and radiations using 50 mm insulation thickness) were found to be 110 W (10 %), 99 W (9 %), 89 W (8 %), 128 W (12 %), 161 W (15 %), and 89 W (8 %), respectively. These findings of CFD analysis and mathematical modeling were also consistent with real-time data, which was logged through an online Control and Monitoring Interface portal. The final energy available to the PCM was 414W with an overall system efficiency of 38 %, which can be improved by decreasing thermal losses of the system and using other PCM materials.
Zitieren
@unpublished{doi:10.17170/kobra-202008051532,
author={Munir, Anjum and Hensel, Oliver},
title={Solar Thermal Energy Storage System},
year={2019}
}
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2020-08-11T13:44:15Z 2020-08-11T13:44:15Z 2019 doi:10.17170/kobra-202008051532 978-3-7376-0635-6 (e-bbok) http://hdl.handle.net/123456789/11679 eng kassel university press urn:nbn:de:0002-406353 Namensnennung - Weitergabe unter gleichen Bedingungen 4.0 International http://creativecommons.org/licenses/by-sa/4.0/ latent heat storage Mannitol computational fluid dynamics Scheffler reflector solar heat receiver 620 Solar Thermal Energy Storage System Working paper Thermal energy storage technologies are gaining attention nowadays for uninterrupted supply of solar power in off-sunshine hours. An indigenized solar phase change material (PCM) system was developed and performance evaluated in the current study to efficiently store solar thermal power using a latent heat storage approach, which can be utilized in any subsequent decentralized food processing application. A 2.5 m2 laying Scheffler reflector is used to precisely focus the incoming direct normal irradiance (DNI) on a casted aluminum heat receiver (220 mm diameter) from where this concentrated heat energy is absorbed and conducted to the PCM unit by the flow of thermal oil (Fragoltherm-32 thermo-oil). During the circulation around PCM pipes inside the PCM unit, thermal oil discharges heat energy to the PCM, which undergoes change of phase from solid to liquid. Computational fluid dynamics (CFD) analysis of the PCM unit were also performed according to the actual boundary conditions, which gave satisfactory results in terms of temperature and velocity distribution. With an average DNI of 781 W/m2, the highest temperature of the receiver surface during the trials was observed at about 155 C that produces thermal oil at 110°C inside the receiver and around 48°C of PCM in the PCM unit. The heat energy losses per unit time (W) due to the lack of reflectivity from the Scheffler reflector, out-of-focus radiations at the targeted area, absorptivity of heat receiver, piping system losses, and cylinder losses (in the form of conduction, convection, and radiations using 50 mm insulation thickness) were found to be 110 W (10 %), 99 W (9 %), 89 W (8 %), 128 W (12 %), 161 W (15 %), and 89 W (8 %), respectively. These findings of CFD analysis and mathematical modeling were also consistent with real-time data, which was logged through an online Control and Monitoring Interface portal. The final energy available to the PCM was 414W with an overall system efficiency of 38 %, which can be improved by decreasing thermal losses of the system and using other PCM materials. open access Munir, Anjum Hensel, Oliver 45 Seiten ICDD Working Papers ;; No. 26 Kassel 978-3-7376-0634-9 (print) Sonnenenergie Latentwärmespeicher Mannit Reflektor <Lichttechnik> Sonnenkollektor using phase change material for uninterrupted on-farm agricultural processing and value addition publishedVersion ICDD Working Papers No. 26 true ICDD Working Papers Naturwissenschaft, Technik, Informatik, Medizin Monographie FB 11 / Ökologische Agrarwissenschaften FB 14 / Bauingenieur- und Umweltingenieurwesen
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