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Title: Evaluation of the energy storage performance of PCM nano-emulsion in a small tubular heat exchanger
Authors: Liu, L 
Li, J 
Niu, J 
Wu, JY 
Issue Date: Aug-2021
Source: Case studies in thermal engineering, Aug. 2021, v. 26, 101156
Abstract: PCM emulsions have attracted considerable interest as the media for thermal energy storage (TES) owing to their high thermal storage capacity, desirable fluidity and thermal conductivity. However, the direct transportation of PCM emulsions in TES systems for both charging and discharging is rarely reported. In this work, a PCM-in-water nano-emulsion was prepared with n-hexadecane and suitable surfactants for cooling energy storage at a charging and discharging temperature range of 20–5 °C and 5–15 °C, respectively. It was applied to a tubular heat exchanger system to evaluate its TES performance for a cooling panel of 0.2 m2 total surface area. The thermal storage performance was notably increased with the flow rate of emulsion through the exchanger tube. The volumetric thermal storage capacity of charging was 50% higher than that of water. The cooling energy could be rapidly released in the discharging process, 79% of the stored energy at averaging 25 W during most of the discharging period. The emulsion remained stable throughout the test period. Overall, the results demonstrated that the PCM nano-emulsion has the unique characteristics of high static stability, and high energy releasing efficiency and the promising potential for air-conditioning application in buildings.
Keywords: Charging and discharging rate
Cooling energy storage
PCM emulsion
Thermal storage capacity
Tubular heat exchanger
Publisher: Elsevier BV
Journal: Case studies in thermal engineering 
EISSN: 2214-157X
DOI: 10.1016/j.csite.2021.101156
Rights: © 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
The following publication Liu, L., Li, J., Niu, J., & Wu, J. Y. (2021). Evaluation of the energy storage performance of PCM nano-emulsion in a small tubular heat exchanger. Case Studies in Thermal Engineering, 101156 is available at https://doi.org/10.1016/j.csite.2021.101156
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