Experimental study on the storage and release characteristics of phase change materials with different nanomaterials as
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ORIGINAL
Experimental study on the storage and release characteristics of phase change materials with different nanomaterials as addictives Shihua Zhang 1 & Xuelai Zhang 1 & Xiaofeng Xu 1 & Yi Zhao 1 Received: 22 June 2019 / Accepted: 10 May 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The effect of nanomaterials on the thermal behavior of Decanoic-Caprylic Acid (DA-CA) binary eutectic mixture was investigated experimentally. Different high thermal conductivity nanomaterials, including nano-sized iron oxide (Fe2O3), nano-sized copper (Cu), hydroxylated multi-walled carbon nanotubes (MWCNT-OH), and dispersant Span-60, were added into DA-CA, respectively. The nanomaterial-enhanced phase change materials (NePCMs) were prepared by the ultrasonic oscillation method. The effects of nanomaterials on the cool storage performance of DA-CA were studied from the types and concentrations of nanomaterials. The experimental results showed that as the nanomaterials mass concentration increased, the thermal conductivity increased first and then gradually stabilized. The thermal conductivity trend for the composites added to the nanomaterials was: 0.40 g·L−1 Fe2O3 > 0.10 g·L−1 MWCNT-OH > 0.30 g·L−1 Cu. DA-CA + 0.40 g·L−1 Fe2O3 exhibited the best thermal properties, and its thermal conductivity increased by 36.8%, and the thermal storage time decreased by 38%. After 500 times thermal stability test, the NePCMs still maintained the appropriate phase change temperature and high latent heat. Therefore, this material has potential as part of the cold chain logistics for fruit and vegetable preservation. Keywords Fatty acid . Composite phase change material . Thermal properties . Nanomaterials
1 Introduction It is necessary to maintain proper temperature management for high quality agricultural products. The most significant amount of deterioration occurs at high ambient temperatures, a scenario that exists just after transportation [1]. Due to the large temperature fluctuations during cold chain, a large number of agricultural products lose more than 20% during transportation every year in China [2]. The widely spread usage of phase change energy storage technology is due to the highdensity energy storage of phase change materials (PCMs), high stability of energy storage/release during the phase change, and small temperature fluctuations [3]. Applying phase change energy storage technology to cold chain logistics can achieve the goal of long-term cold storage of products. Not only it is energy-conserving, but it also reduces the chance of product loss during cold chain circulation [4]. These * Xuelai Zhang [email protected] 1
Institute of Cool Thermal Storage Technology, Shanghai Maritime University, Shanghai 201306, China
characteristics make energy storage technology widely used in many applications such as fresh-keeping and anti-icing transportation [5, 6], cold storage box [7–9], greenhouse [10, 11], food packaging [12, 13] and other systems. Like other organic PCMs, the main disadvantage of fat
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