Title
Performance analysis of industrial PCM heat storage lab prototype
Author
Zondag, H.A.
de Boer, R.
Smeding, S.F.
van der Kamp, J.
Publication year
2018
Abstract
A 140 l lab scale shell-and-tube PCM heat storage was built and tested, and the experimental results were compared to a numerical model. Natural convection in the PCM was found to significantly influence the local temperature distribution in the storage vessel, which could not be predicted well by the model, since the model assumes only conductive heat transport in the PCM. Nevertheless, the overall thermal power output of the storage could be predicted fairly well, if a correction term was used in the model to compensate for the enhanced heat transfer in the molten PCM. Experimentally, a horizontal orientation was found to be beneficial due to increased heat exchange during charging (melting). Comparing the two PCMs used in the testing (RT70 and MgCl2·6H2O), it was found that the RT70 had stable performance while the salt hydrate showed a reduced melting enthalpy which was ascribed to phase separation. For the RT70, a thermal power of 5 kW is obtained during phase change in the charging phase, and 3.5–2 kW during phase change in the discharging phase, while for MgCl2·6H2O this was 3.5 kW and 3–2 kW respectively.
Subject
Energy Efficiency
Energy
Energy / Geological Survey Netherlands
Industrial heat storage
PCM
Prototype
Heat storage
Industrial heating
Magnesium compounds
Melting
Phase separation
Pulse code modulation
Conductive heat
Correction terms
Enhanced heat transfer
Melting enthalpy
Performance analysis
Prototype
Stable performance
Storage vessel
Heat transfer
To reference this document use:
http://resolver.tudelft.nl/uuid:3fb90b61-9683-42de-bb70-2b6881e0cd83
DOI
https://doi.org/10.1016/j.est.2018.05.007
TNO identifier
805703
Source
Journal of Energy Storage, 18, 402-413
Document type
article