Thermophysical property analysis of semi-clathrate hydrates of tetrabutyl-(ammonium/phosphonium) salts as phase change materials for cold storage

Zhang, Wenxiang; Du, Xinyan; Guo, Kai; Chen, Renjie; Chen, Jianbiao

doi:10.1016/j.molliq.2022.120643

Cited by 6 publications

(1 citation statement)

References 54 publications

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“…The organics mainly consist of paraffins such as dodecane [3], tetradecane [4], or eutectic of alphabetic acids [5], alcohols [6], or esters, such as the eutectic of dodecyl alcohol and octylic acid, palmitates, etc. The inorganics include ice [7], tetrabutyl-(ammonium/phosphonium) salts [8], and calcium chloride hexahydrate [9,10]. Among them, n-tetradecane has a melting point of 4 °C, which is suitable for a cold storage box in the transportation of cherished food or medical products as they need to be contained at a temperature between 2 and 8 °C.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Thermal Model of Tetradecane/Expanded Graphite and A Spiral Wavy Plate Cold Storage Tank

Zhang

Tang

et al. 2022

Energies

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A cold storage unit can store the cold energy off-peak and release it for building cooling on-peak, which can reduce the electricity load of air conditioning systems. N-tetradecane is a suitable cold storage material for air conditioning, with a phase change temperature of is 4–8 °C and a phase change enthalpy of 200 kJ/kg. However, its low thermal conductivity limits the application of n-Tetradecane for high-power cold storage/release. This paper prepares a tetradecane/expanded graphite (EG) composite phase change material (CPCM), whose thermal conductivity can be increased up to 21.0 W/m·K, nearly 100 times over the raw n-tetradecane. A novel model to predict the maximum loading fraction of paraffin in the EG matrix is presented, with an error within 1.7%. We also develop a thermal conductivity model to predict the thermal conductivity of the CPCM precisely, with an error of less than 10%. In addition, an innovative spiral wave plate cold storage tank has been designed for the tetradecane/EG composite. The power and energy density of the cold storage tank are significantly improved compared to that of raw tetradecane. The energy density reaches 40 kWh/m3, which is high among the organic PCM thermal storage tank. This paper shows the significance of thermal conductivity enhancement in designing a cold storage tank.

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