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Experimental results from a laboratory-scale molten salt thermocline storage

: Seubert, Bernhard; Müller, Ralf; Willert, Daniel; Fluri, Thomas

Fulltext urn:nbn:de:0011-n-4942910 (1.1 MByte PDF)
MD5 Fingerprint: 38386324b058c37d4421ac1d178aa454
Copyright AIP
Created on: 30.06.2018

Al Obaidli, A. ; American Institute of Physics -AIP-, New York:
22nd SOLARPACES 2016, International Conference on Concentrating Solar Power and Chemical Energy Systems. Proceedings : 11-14 October 2016, Abu Dhabi, United Arab Emirates
New York, N.Y.: AIP Press, 2017 (AIP Conference Proceedings 1850)
ISBN: 978-0-7354-1522-5
Art. 080025, 10 pp.
International Conference on Concentrating Solar Power and Chemical Energy Systems (SolarPACES) <22, 2016, Abu Dhabi>
European Commission EC
H2020; 657690; ORC-PLUS
Organic Rankine Cycle - Prototype Link to Unit Storage
Conference Paper, Electronic Publication
Fraunhofer ISE ()

Single-tank storage presents a valid option for cost reduction in thermal energy storage systems. For low-temperature systems with water as storage medium this concept is widely implemented and tested. For high-temperature systems very limited experimental data are publicly available. To improve this situation a molten salt loop for experimental testing of a single-tank storage prototype was designed and built at Fraunhofer ISE. The storage tank has a volume of 0.4 m3 or a maximum capacity of 72 kWhth. The maximum charging and discharging power is 60 kW, however, a bypass flow control system enables to operate the system also at a very low power. The prototype was designed to withstand temperatures up to 550 °C. A cascaded insulation with embedded heating cables can be used to reduce the effect of heat loss on the storage which is susceptible to edge effects due to its small size. During the first tests the operating temperatures were adapted to the conditions in systems with thermal oil as heat transfer fluid and a smaller temperature difference. A good separation between cold and hot fluid was achieved with temperature gradients of 95 K within 16 cm.