Assessing corrosive behaviour of commercial phase change materials in the 21–25 ºC temperature range

Marín, Paula E.; Ushak, Svetlana; Gracia, Álvaro de; Grágeda, Mario; Cabeza, Luisa F.

doi:10.1016/j.est.2020.101711

Cited by 16 publications

(2 citation statements)

References 22 publications

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“…Compatibility between the PCM (RT15, RT18 HC, and RT22 HC) and metal samples (copper, aluminum, and a copper/aluminum combination) was checked for a period of 7 weeks. This time span is similar to compatibility investigations by Marín et al [ 18 ] and Devanuri et al [ 19 ]. Metal samples were extracted from the PCM after 1, 3, 4, and 7 weeks for weighing.…”

Section: Resultssupporting

confidence: 89%

“…The SP21 should be used carefully in storage made of aluminum or carbon steel because these metals showed signs of corrosion. Marín et al [ 18 ] checked the material compatibility of PCMs with a phase change temperature in the temperature range of 20–25 °C for use in building installation. They tested the material compatibility of two organic PCMs (RT21 and RT25) and two inorganic (SP21E and HS-24P) with copper, aluminum, and stainless steel samples.…”

Section: Introductionmentioning

confidence: 99%

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Compatibility Tests between Three Commercially Available Organic PCMs and Metals Typically Used in Fin-and-Tube Heat Exchangers

2021

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Energy storage is one of the most effective ways to increase energy savings and efficiency of heating and air conditioning systems. Phase change materials (PCMs) are increasingly used in latent heat thermal energy storage (LHTES) systems to increase their capacity. In such systems, costs are a very important factor of viability so the typical heat transfer elements like fin-and-tube heat exchangers are used to construct the LHTES. The problem of this approach is a possibility of corrosion of metals in contact with PCM that shortens the life cycle of LHTES. Therefore, the main objective of this work is an experimental study of the compatibility of metals typically used in fin-and-tube heat exchangers (copper and aluminum) with three commercially available organic PCMs (RT15, RT18HC, and RT22HC). Compatibility of PCMs with copper and aluminum was tested for a period of approximately two months, during which a total of 35 heating and cooling cycles were carried out, each with a complete phase transition of the tested materials. In the course of the tests it was assessed whether the PCM caused corrosion of the tested metals. The evaluation was based on the gravimetric method, calculation of corrosion rate, and visual observations and measurements of the features on the metal sample’s surface using optical microscope. It was determined that RT15, RT18 HC, and RT22 HC show low corrosion rates for aluminum and copper samples. The visual tests indicate that there was no change in the PCM solutions during the tests, only a sediment was observed for the samples with the combination of copper and aluminum. Microscopic examination of the surface of the samples did not show any significant surface changes, except for the aluminum samples, on the surface of which local microdefects were observed. It follows from the present results that copper and aluminum can be used to design the heat transfer surface in contact with the chosen PCMs.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%