Abstract
Oxalic acid dihydrate (OAD) which has very high initial phase transition enthalpy is a promising phase change material (PCM). In this paper, shape-stabilized composite PCMs composed of OAD and bentonite were prepared by a facile blending method to overcome the problem of leakage. FT-IR results indicated the interactions between OAD and bentonite, such as the capillary force and the hydrogen bonding, resulting in the confined crystallization process. As a result, the OAD was confined to be amorphous. The thermogravimetric analysis and scanning electron microscope results showed that sample had the best coating effect when the amount of bentonite was 17.7%. The differential scanning calorimetry analyses demonstrated that a decrease in the OAD content was accompanied by a continuous decrease in the melting point and phase change enthalpy of the composites.
Highlights
Heat storage is used to close the temporal gap between thermal energy production and energy demand
Published under licence by IOP Publishing Ltd promising phase change material (PCM) in TES for applications such as industrial waste heat recovery or solar energy storage systems [14,15,16,17]. This is why authors of this paper have considered the use of Oxalic acid dihydrate (OAD) as a PCM
One can observe the presence of a large space between discrete layers, which facilitates the intercalation of the solid-liquid PCMs
Summary
Heat storage is used to close the temporal gap between thermal energy production and energy demand. In many cases, it is the prerequisite for the utilization of waste heat in periodic industrial processes and the connection of renewable energy sources (especially solar energy) to continuous thermal loads. The application of phase change materials (PCMs) is one possible heat storage technology. PCMs are functional materials for thermal energy storage by storing and releasing amount of latent heats during their phase change processes [1]. OAD has a very high heat of fusion of 370 J·g-1 [13], which is a very
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
