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Improvement and validation of unitary air conditioner and heat pump simulation models at off-design conditions.

机译：在非设计条件下改进和验证整体式空调和热泵仿真模型。

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摘要

So far, there have only been a few in-depth research studies related to system simulation of unitary air conditioners and heat pumps at off-design conditions. However, it is clear that the current simulation tools and tuning methodologies do not provide accurate predictions at some off-design conditions. This report focuses on improved modeling methods for these situations. Comprehensive experimental and simulation studies are performed in this report to support this effort. Specific accomplishments of this work include identification of improved modeling methods for handling two-phase refrigerant entering the compressor, investigation of the effects of non-uniform distribution of refrigerant flow, investigation of the effects of a suction line accumulator in a heat pump, and development of an improved tuning method for charge modeling. The charge tuning method significantly improves simulations in the case of two-phase refrigerant entering the fixed-area expansion device.; An existing system simulation model (ACMODEL) is the major tool that is used for this work and multiple improvements have been made in its capabilities. Based on an exhaustive literature search, the most appropriate up-to-date research results have been incorporated into each component model of the system simulation tool. In addition, a flexible heat exchanger modeling scheme has been developed that allows specification of heat exchanger design and circuiting.; Extensive tests with detailed measurements were performed for two R-410A air conditioner units, one R-407C air conditioner unit, and one R-22 heat pump unit, which included over 350 points in different test series. All the tests have been simulated and analyzed in the report. The simulations were conducted at both the component level and system level.; The overall accuracies of the improved ACMODEL in predicting cooling capacity and compressor power consumption of unitary air conditioners and heat pumps at off-design operating conditions are within 3% for the cases of no two-phase refrigerant entering the compressor or expansion device. In the cases of, two-phase refrigerant entering the compressor or expansion device, the overall accuracies of the improved ACMODEL in predicting compressor power consumption are within 5%, and the overall accuracies of predicting cooling capacity are within 10%.
机译：到目前为止，只有很少的深入研究与非设计条件下的一体式空调和热泵的系统仿真有关。但是，很明显，当前的仿真工具和调整方法无法在某些非设计条件下提供准确的预测。本报告重点介绍针对这些情况的改进建模方法。本报告中进行了全面的实验和模拟研究，以支持这项工作。这项工作的具体成就包括确定用于处理进入压缩机的两相制冷剂的改进建模方法，研究制冷剂流量不均匀分布的影响，研究热泵中的吸入管路蓄能器的影响以及开发用于电荷建模的改进调整方法的说明。在两相制冷剂进入固定面积膨胀装置的情况下，充气调节方法显着改善了模拟。现有的系统仿真模型（ACMODEL）是用于此工作的主要工具，并且已对其功能进行了多项改进。在详尽的文献搜索基础上，最合适的最新研究结果已纳入系统仿真工具的每个组件模型中。另外，已经开发了灵活的热交换器建模方案，该方案允许规范热交换器设计和回路。对两台R-410A空调单元，一台R-407C空调单元和一台R-22热泵单元进行了详尽的测试，包括不同测试系列的350多个点。报告中对所有测试进行了模拟和分析。仿真是在组件级别和系统级别上进行的。对于没有两相制冷剂进入压缩机或膨胀装置的情况，改进的ACMODEL在预测非设计运行条件下的整体空调和热泵的制冷能力和压缩机功耗方面的总体准确性在3％以内。在两相制冷剂进入压缩机或膨胀装置的情况下，改进的ACMODEL在预测压缩机功耗方面的总体准确性在5％之内，而在预测制冷量方面的总体准确性在10％之内。

著录项

  • 作者

    Shen, Bo.;

  • 作者单位

    Purdue University.;

  • 授予单位 Purdue University.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 278 p.
  • 总页数 278
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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