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Thermodynamic optimization of a solar system for cogeneration of water heating/purification and absorption cooling.

机译：太阳能系统的热力学优化，用于水加热/净化和吸收冷却的热电联产。

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摘要

This dissertation presents a contribution to understanding the behavior of solar powered air conditioning and refrigeration systems with a view to determining the manner in which refrigeration rate; mass flows, heat transfer areas, and internal architecture are related. A cogeneration system consisting of a solar concentrator, a cavity-type receiver, a gas burner, and a thermal storage reservoir is devised to simultaneously produce water heating/purification and cooling (absorption refrigerator system). A simplified mathematical model, which combines fundamental and empirical correlations, and principles of classical thermodynamics, mass and heat transfer, is developed. An experimental setup was built to adjust and validate the numerical results obtained with the mathematical model. The proposed model is then utilized to simulate numerically the system transient and steady state response under different operating and design conditions. A system global optimization for maximum performance (or minimum exergy destruction) in the search for minimum pull-down and pull-up times, and maximum system second law efficiency is performed with low computational time. Appropriate dimensionless groups are identified and the results presented in normalized charts for general application. The numerical results show that the three way maximized system second law efficiency, eta II,max,max,max, occurs when three system characteristic mass flow rates are optimally selected in general terms as dimensionless heat capacity rates, i.e., (Psisps, Psiwxwx, PsiHs) opt ≅(1.43, 0.17, 0.19). The minimum pull-down and pull-up times, and maximum second law efficiencies found with respect to the optimized operating parameters are sharp and, therefore important to be considered in actual design. As a result, the model is expected to be a useful tool for simulation, design, and optimization of solar energy systems in the context of distributed power generation.
机译：这篇论文为理解太阳能空调和制冷系统的行为做出了贡献，以期确定制冷速率的方式。质量流量，传热面积和内部结构相关。设计了由太阳能集中器，空腔型接收器，燃气燃烧器和储热器组成的热电联产系统，以同时产生水加热/净化和冷却（吸收式制冷机系统）。建立了简化的数学模型，该模型结合了基本的和经验的相关性，以及经典的热力学，传质和传热的原理。建立了一个实验装置来调整和验证通过数学模型获得的数值结果。然后，利用所提出的模型对不同操作和设计条件下的系统瞬态和稳态响应进行数值模拟。在最小的上拉时间和上拉时间以及最大的系统第二定律效率的搜索中，以最小的计算时间执行了系统全局优化，以实现最佳性能（或最小的火用破坏）。识别适当的无量纲组，并将结果显示在标准化图表中以用于一般应用。数值结果表明，当一般选择最佳的三个系统特征质量流量作为无量纲热容率时，即会出现三路最大化系统第二定律效率eta II，max，max，max，即（Psisps，Psiwxwx， PsiHs）选择≅（1.43，0.17，0.19）。相对于优化的工作参数而言，最小的下拉时间和上拉时间以及最大的第二定律效率非常明显，因此在实际设计中必须加以考虑。因此，该模型有望成为分布式发电环境下太阳能系统仿真，设计和优化的有用工具。

著录项

  • 作者

    Hovsapian, Zohrob O.;

  • 作者单位

    The Florida State University and Florida Agricultural and Mechanical University.;

  • 授予单位 The Florida State University and Florida Agricultural and Mechanical University.;
  • 学科 Engineering Mechanical.;Energy.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 201 p.
  • 总页数 201
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;能源与动力工程;
  • 关键词

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