scholarly journals Investigation of heat transfer coefficients in a liquid–liquid direct contact latent heat storage system

2020 ◽  
Vol 28 ◽  
pp. 101178 ◽  
Author(s):  
Sven Kunkel ◽  
Tobias Teumer ◽  
Patrick Dörnhofer ◽  
Frederik Wunder ◽  
Jens-Uwe Repke ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Latent Heat ◽  
Direct Contact ◽  
Heat Storage ◽  
Storage System ◽  
Transfer Coefficients ◽  
Latent Heat Storage ◽  
Heat Transfer Coefficients

Determination of heat transfer coefficients in direct contact latent heat storage systems

2018 ◽  
Vol 145 ◽  
pp. 71-79 ◽  
Author(s):  
Sven Kunkel ◽  
Tobias Teumer ◽  
Patrick Dörnhofer ◽  
Kerstin Schlachter ◽  
Yohana Weldeslasie ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Latent Heat ◽  
Direct Contact ◽  
Heat Storage ◽  
Storage Systems ◽  
Transfer Coefficients ◽  
Latent Heat Storage ◽  
Heat Transfer Coefficients

scholarly journals Effective Separation of a Water in Oil Emulsion from a Direct Contact Latent Heat Storage System

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2264 ◽  
Author(s):  
Sebastian Ammann ◽  
Andreas Ammann ◽  
Rebecca Ravotti ◽  
Ludger Fischer ◽  
Anastasia Stamatiou ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Latent Heat ◽  
Direct Contact ◽  
Heat Storage ◽  
Storage System ◽  
Heat Transfer Fluid ◽  
Storage Unit ◽  
Latent Heat Storage ◽  
Oil Emulsion ◽  
Water In Oil Emulsion

The problem of emulsification between Phase Change Material (PCM) and Heat Transfer Fluid (HTF) in direct contact latent heat storage systems has been reported in various studies. This issue causes the PCM to flow out of the storage tank and crystallize at unwanted locations and thus presents a major limitation for the proper operation of such systems. These anomalies become more pronounced when high HTF flow rates are employed with the aim to achieve fast heat transfer rates. The goal of this paper is to find a method which will enable the fast separation of the formed emulsion and thus the uninterrupted operation of the storage unit. In this study, three separation methods were examined and the use of superhydrophobic filters was chosen as the best candidate for the demulsification of the PCM and HTF mixtures. The filter was produced by processing of a melamine sponge with different superhydrophobic adhesives and was tested with emulsions closely resembling the ones formed in a real direct contact setup. The superhydrophobic filter obtained, was able to separate the emulsions effectively while presenting a very high permeability (up to 1,194,980 kg h−1 m−2 bar−1). This is the first time the use of a superhydrophobic sponge has been investigated in the context of demulsification in direct contact latent heat storage.

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