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Off-grid solar thermal water heating system using phase-change materials: design, integration and real environment investigation

机译：使用相变材料的离网太阳能热水系统：设计，集成和真实环境调查

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摘要

A solar thermal water heating system using a custom-built latent heat storage tank with paraffin wax, puretemp68 and stearic acid/palmitic acid eutectic mixture based phase-change materials was designed, developed and its performance evaluated in real-time. The fully autonomous off-grid solar thermal water heating system was packaged by integrating solar thermal collector, phase change material tank, photovoltaic modules, operational controller, circulation pumps and battery, along with a data logger. A water-glycol with anti-freeze characteristics with efficient energy storage in cold weather was employed as heat transfer fluid for solar thermal energy harvesting for charging and discharging of phase change materials to heat the water tank. Solar charge-discharge and water charging results with phase change materials during May to October 2018 (Mesa, AZ 85212, USA) showed that the stearic acid/palmitic acid eutectic mixture outperformed the paraffin wax and exhibited comparable performance with puretemp68 storage system. The efficiency of water charging from stearic acid/palmitic acid (55%) is higher compared to that from paraffin wax (20%) and better than puretemp68 (45%). Even though, the paraffin wax melts quickly during charging, it exhibited super-cooling behavior during discharging, leading to incomplete discharge. The storage energy density of stearic acid/palmitic acid (similar to 0.48 MJ kg(-1)) is comparable to puretemp68 with uniform thermal energy distribution inside the storage container due to higher thermal conductivity and lower melting point. The solar thermal water heating system demonstration proved that the domestic hot water system using stearic acid/palmitic acid could be a practical solution for effectively harvesting solar thermal energy for rural areas.
机译：使用定制的潜热储罐和石蜡，puretemp68和基于硬脂酸/棕榈酸的低共熔混合物的相变材料，设计，开发了太阳能热水系统，并对其性能进行了实时评估。通过集成太阳能集热器，相变材料储罐，光伏模块，运行控制器，循环泵和电池以及数据记录器，对全自动离网太阳能热水系统进行了包装。具有抗冻特性且在寒冷天气中具有有效能量存储的水乙二醇被用作传热流体，用于太阳能热能的收集和充放电相变材料以加热水箱。在2018年5月至10月（美国，亚利桑那州，梅萨（Mesa，AZ 85212））中使用相变材料进行的太阳能充放电结果表明，硬脂酸/棕榈酸共晶混合物的性能优于石蜡，并且具有与puretemp68存储系统相当的性能。硬脂酸/棕榈酸的充水效率（55％）比石蜡的充水效率（20％）高，并且比puretemp68（45％）更好。即使石蜡在装料过程中迅速融化，在卸料过程中也表现出过冷行为，导致卸料不完全。硬脂酸/棕榈酸的存储能量密度（类似于0.48 MJ kg（-1））与puretemp68相当，由于较高的热导率和较低的熔点，其在存储容器内部的热能分布均匀。太阳能热水系统的演示证明，使用硬脂酸/棕榈酸的家用热水系统可能是有效收集农村地区太阳能热能的实用解决方案。

著录项

  • 来源
    《Applied Energy》 |2019年第15期|73-83|共11页
  • 作者

    Prakash Jyoti; Roan Daryn; Tauqir Wajeha; Nazir Hassan; Ali Majid; Kannan Arunachala;

  • 作者单位

    Arizona State Univ, Polytech Sch, Ira A Fulton Sch Engn, Mesa, AZ 85212 USA;

    Arizona State Univ, Polytech Sch, Ira A Fulton Sch Engn, Mesa, AZ 85212 USA;

    Arizona State Univ, Polytech Sch, Ira A Fulton Sch Engn, Mesa, AZ 85212 USA|Natl Univ Sci & Technol, US Pakistan Ctr Adv Studies Energy USPCAS E, Islamabad 44000, Pakistan;

    Natl Univ Sci & Technol, US Pakistan Ctr Adv Studies Energy USPCAS E, Islamabad 44000, Pakistan;

    Natl Univ Sci & Technol, US Pakistan Ctr Adv Studies Energy USPCAS E, Islamabad 44000, Pakistan;

    Arizona State Univ, Polytech Sch, Ira A Fulton Sch Engn, Mesa, AZ 85212 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Phase change material; Latent heat; Solar thermal water heating; Off-grid system;

    机译：相变材料;潜热;太阳能热水;离网系统;

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