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Single-pass cross-flow micro-channel heat exchangers for use in organic Rankine cycles.

机译：用于有机朗肯循环的单程错流微通道换热器。

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摘要

Due to rising energy costs and increasing concerns of green house gas emissions, much research is being conducted to develop a means of efficiently converting low grade thermal energy into useable energy in the form of mechanical work or electrical power. One such technology is an Organic Rankine Power cycle (ORC). One difficulty in utilizing an ORC to harness low-grade thermal energy is the transfer of heat from the source to the working fluid of the power cycle. Micro channel heat exchangers are capable of achieving extremely high rates of heat transfer and are good candidates for application in and ORC.; This thesis provides experimental validation of a computer model used to design single pass cross flow microchannel heat exchangers for use in ORC's. A model ORC was constructed and used to test the performance of the boiler and condenser, both of which were designed by the computer model. The performance of the heat exchangers was calculated using the effectiveness method and the log mean temperature method, also the overall rate of heat transfer and pressure drop were calculated for the heat exchangers. The average accuracy of the total heat transfer in the boiler was 29.9%. The average accuracy of the total heat transfer in the condenser was 8.9%. A major contributor to the inaccuracy found in the boiler model was the inability to determine the phase of the refrigerant around the saturation point due to limitation in the data acquisition system.
机译：由于能源成本的上涨和对温室气体排放问题的日益关注，正在进行大量研究以开发一种以机械功或电力的形式有效地将低品位热能转换为可用能源的方法。一种这样的技术是有机朗肯动力循环（ORC）。利用ORC来利用低级热能的一个困难是热量从源到功率循环的工作流体的传递。微通道换热器能够实现极高的热传递率，是ORC和ORC应用的良好候选者。本文为设计用于ORC的单程错流微通道换热器的计算机模型提供了实验验证。构造了ORC模型并用于测试锅炉和冷凝器的性能，两者均由计算机模型设计。使用有效性方法和对数平均温度方法计算热交换器的性能，还计算热交换器的总传热速率和压降。锅炉中总传热的平均精度为29.9％。冷凝器中总传热的平均精度为8.9％。锅炉模型中发现的不准确性的主要原因是由于数据采集系统的限制而无法确定饱和点附近的制冷剂相。

著录项

  • 作者

    Ingold, Abram M.;

  • 作者单位

    Southern Illinois University at Carbondale.$bEngineering Science.;

  • 授予单位 Southern Illinois University at Carbondale.$bEngineering Science.;
  • 学科 Engineering Mechanical.; Energy.
  • 学位 M.S.
  • 年度 2007
  • 页码 100 p.
  • 总页数 100
  • 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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