Enhancing Air Conditioning System Performance via Dual Phase Change Materials Integration: Seasonal Efficiency and Capsulation Structure Impact

IF 2.5 4区工程技术 Q3 CHEMISTRY, PHYSICAL

International Journal of Thermophysics Pub Date : 2024-07-29 DOI:10.1007/s10765-024-03407-2

M. Ismail, Hamdy Hassan

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Abstract

Enhancement of the cooling and heating capabilities of an air conditioning unit (ACU) coupled with a thermal energy storage system of dual phase change materials (PCM) is investigated. The dual PCM, namely SP24E and SP11_gel, are coupled with the ACU outdoor device (condenser/evaporator) during the summer/winter seasons, respectively. Moreover, ACU performance assisted with dual-PCM heat exchanger is compared with a single heat exchanger of SP24E in summer and single heat exchanger of SP11_gel in winter at different PCM capsulation structures (aligned and staggered cylinders). The system dynamic mathematical model is computationally solved using ANSYS software and experimentally validated. Results affirm that charging/discharging periods are minimal for the dual-PCM system and slower for PCM inline cylinder layouts than staggered ones. Inline design yields greater ACU average power savings. In summer, higher inlet air temperature to the PCM system reduces PCM discharging time and ACU power savings, with the opposite effect during winter. ACU COP with PCMs is improved by around 80 % in summer and 40 % in winter, respectively, compared to ACU without PCMs. The maximum average power saving over 4 h of ACU working in summer by single and dual-PCM systems is 21.4 % and 11.8 %, respectively, whereas the results in winter are 18.5 % and 12.8 %, respectively.

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通过整合双相变材料提高空调系统性能：季节效率和封装结构的影响

本研究探讨了如何提高空调机组（ACU）与双相变材料（PCM）热能储存系统的制冷和制热能力。双 PCM（即 SP24E 和 SP11_凝胶）分别在夏季和冬季与空调室外装置（冷凝器/蒸发器）耦合。此外，在不同的 PCM 封装结构（对齐圆筒和交错圆筒）下，采用双 PCM 热交换器的空调机组与 SP24E 单热交换器（夏季）和 SP11_gel 单热交换器（冬季）的性能进行了比较。使用 ANSYS 软件对系统动态数学模型进行了计算求解和实验验证。结果表明，双 PCM 系统的充放电周期最小，PCM 直列式气缸布局比交错式气缸布局慢。直列式设计可节省更多的 ACU 平均功率。夏季，PCM 系统的进气温度较高，PCM 放电时间缩短，ACU 功率节省减少，冬季则相反。与不带 PCM 的 ACU 相比，带 PCM 的 ACU COP 在夏季和冬季分别提高了约 80% 和 40%。在夏季，单和双 PCM 系统 ACU 工作 4 小时的最大平均节电率分别为 21.4 % 和 11.8 %，而冬季的结果分别为 18.5 % 和 12.8 %。

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来源期刊

International Journal of Thermophysics 物理-力学

CiteScore

4.10

自引率

9.10%

发文量

179

审稿时长

5 months

期刊介绍： International Journal of Thermophysics serves as an international medium for the publication of papers in thermophysics, assisting both generators and users of thermophysical properties data. This distinguished journal publishes both experimental and theoretical papers on thermophysical properties of matter in the liquid, gaseous, and solid states (including soft matter, biofluids, and nano- and bio-materials), on instrumentation and techniques leading to their measurement, and on computer studies of model and related systems. Studies in all ranges of temperature, pressure, wavelength, and other relevant variables are included.