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首页> 外文学位 >A Technical and Economic Comparative Analysis of Sensible and Latent Heat Packed Bed Storage Systems for Concentrating Solar Thermal Power Plants.
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A Technical and Economic Comparative Analysis of Sensible and Latent Heat Packed Bed Storage Systems for Concentrating Solar Thermal Power Plants.

机译：集中式太阳能热力发电厂的显热和潜热填充床存储系统的技术和经济比较分析。

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摘要

Though economically favorable when compared to other renewable energy storage technologies, thermal energy storage systems for concentrating solar thermal power (CSP) plants require additional cost reduction measures to help transition CSP plants to the point of grid-parity. Thermocline packed bed storage is regarded as one potential low cost solution due to the single tank requirement and low cost storage media. Thus sensible heat storage (SHS) and latent heat storage (LHS) packed bed systems, which are two thermocline varieties, are frequently investigated. LHS systems can be further classified as single phase change material (PCM) systems or cascaded systems wherein multiple PCMs are employed.;This study compared the performance of SHS, single PCM, and cascaded PCM direct storage systems under the conditions that may be encountered in utility-scale molten salt CSP plants operating between 565°C and 288°C. A small-scale prototype SHS packed bed system was constructed and operated for use in validating a numerical model. The drawbacks of the latent heat storage process were discussed, and cascaded systems were investigated for their potential in mitigating the issues associated with adopting a single PCM. Several cascaded PCM configurations were evaluated. The study finds that the volume fraction of each PCM and the arrangement of latent heat in a 2-PCM and a 3-PCM system influences the output of the system, both in terms of quality and quantity of energy. In addition to studying systems of hypothetical PCMs, real salt PCM systems were examined and their selection process was discussed.;A preliminary economic assessment was conducted to compare the cost of SHS, single-PCM LHS, cascaded LHS, and state-of-the-art 2-tank systems. To the author's knowledge, this is the first study that compares the cost of all three thermocline packed bed systems with the 2-tank design. The SHS system is significantly lower in cost than the remaining systems, however the LHS system does show some economic benefit over the 2-tank design. If LHS systems are to be viable in the future, low cost storage media and encapsulation techniques are necessary.
机译：尽管与其他可再生能源存储技术相比在经济上是有利的，但用于集中式太阳能热电（CSP）电厂的热能存储系统仍需要采取其他降低成本的措施，以帮助将CSP电厂过渡到电网同价位。由于对单个储罐的要求和低成本的存储介质，Thermocline填充床存储被视为一种潜在的低成本解决方案。因此，经常研究显热储能（SHS）和潜热储能（LHS）填充床系统，这是两个温跃层变体。 LHS系统可以进一步分类为使用多个PCM的单相变材料（PCM）系统或级联系统。本研究比较了在以下条件下可能遇到的SHS，单个PCM和级联PCM直接存储系统的性能。在565°C至288°C的温度范围内运行的公用事业规模的熔融盐CSP设备。构建并运行了一个小型原型SHS填充床系统，用于验证数值模型。讨论了潜热存储过程的缺点，并研究了级联系统在缓解与采用单个PCM相关的问题方面的潜力。评估了几种级联的PCM配置。研究发现，每个PCM的体积分数以及2-PCM和3-PCM系统中潜热的布置都会影响系统的输出，无论是在能量的质量还是能量上。除了研究假设的PCM系统外，还检查了实际的盐PCM系统并讨论了其选择过程。进行了初步的经济评估，以比较SHS，单PCM LHS，级联LHS和最新状态的成本先进的2储罐系统。据作者所知，这是第一项比较所有三种带有2气瓶设计的温床填充床系统成本的研究。 SHS系统的成本明显低于其余系统，但是LHS系统确实比2储罐设计具有一定的经济效益。如果LHS系统在将来可行，那么低成本的存储介质和封装技术是必要的。

著录项

  • 作者

    Trahan, Jamie.;

  • 作者单位

    University of South Florida.;

  • 授予单位 University of South Florida.;
  • 学科 Mechanical engineering.
  • 学位 Ph.D.
  • 年度 2015
  • 页码 165 p.
  • 总页数 165
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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