Solar Thermal Energy Storage System

Munir, Anjum; Hensel, Oliver

dc.date.accessioned	2020-08-11T13:44:15Z
dc.date.available	2020-08-11T13:44:15Z
dc.date.issued	2019
dc.identifier	doi:10.17170/kobra-202008051532
dc.identifier.isbn	978-3-7376-0635-6 (e-bbok)
dc.identifier.uri	http://hdl.handle.net/123456789/11679
dc.language.iso	eng	eng
dc.publisher	kassel university press
dc.relation.uri	urn:nbn:de:0002-406353
dc.rights	Namensnennung - Weitergabe unter gleichen Bedingungen 4.0 International	*
dc.rights.uri	http://creativecommons.org/licenses/by-sa/4.0/	*
dc.subject	latent heat storage	eng
dc.subject	Mannitol	eng
dc.subject	computational fluid dynamics	eng
dc.subject	Scheffler reflector	eng
dc.subject	solar heat receiver	eng
dc.subject.ddc	620
dc.title	Solar Thermal Energy Storage System	eng
dc.type	Working paper
dcterms.abstract	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.	eng
dcterms.accessRights	open access
dcterms.creator	Munir, Anjum
dcterms.creator	Hensel, Oliver
dcterms.extent	45 Seiten
dcterms.isPartOf	ICDD Working Papers ;; No. 26
dc.publisher.place	Kassel
dc.relation.isbn	978-3-7376-0634-9 (print)
dc.subject.swd	Sonnenenergie	ger
dc.subject.swd	Latentwärmespeicher	ger
dc.subject.swd	Mannit	ger
dc.subject.swd	Reflektor <Lichttechnik>	ger
dc.subject.swd	Sonnenkollektor	ger
dc.title.subtitle	using phase change material for uninterrupted on-farm agricultural processing and value addition	eng
dc.type.version	publishedVersion
dcterms.source.series	ICDD Working Papers
dcterms.source.volume	No. 26
kup.iskup	true
kup.series	ICDD Working Papers
kup.subject	Naturwissenschaft, Technik, Informatik, Medizin
kup.typ	Monographie
kup.institution	FB 11 / Ökologische Agrarwissenschaften
kup.institution	FB 14 / Bauingenieur- und Umweltingenieurwesen