• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国卫生研究院文献>Entropy >Entropy and Entransy Dissipation Analysis of a Basic Organic Rankine Cycles (ORCs) to Recover Low-Grade Waste Heat Using Mixture Working Fluids
【2h】

Entropy and Entransy Dissipation Analysis of a Basic Organic Rankine Cycles (ORCs) to Recover Low-Grade Waste Heat Using Mixture Working Fluids

机译：基本有机朗肯循环（ORCS）的熵和Entransy耗散分析使用混合物工作流体恢复低级废热

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Mixture working fluids can reduce effectively energy loss at heat sources and heat sinks, and therefore enhance the organic Rankine cycle (ORC) performance. The entropy and entransy dissipation analyses of a basic ORC system to recover low-grade waste heat using three mixture working fluids (R245fa/R227ea, R245fa/R152a and R245fa/pentane) have been investigated in this study. The basic ORC includes four components: an expander, a condenser, a pump and an evaporator. The heat source temperature is 120 °C while the condenser temperature is 20 °C. The effects of four operating parameters (evaporator outlet temperature, condenser temperature, pinch point temperature difference, degree of superheat), as well as the mass fraction, on entransy dissipation and entropy generation were examined. Results demonstrated that the entransy dissipation is insensitive to the mass fraction of R245fa. The entropy generation distributions at the evaporator for R245/pentane, R245fa/R152a and R245fa/R227ea are in ranges of 66–74%, 68–80% and 66–75%, respectively, with the corresponding entropy generation at the condenser ranges of 13–21%, 4–17% and 11–21%, respectively, while those at the expander for R245/pentane, R245fa/R152a and R245fa/R227ea are approaching 13%, 15% and 14%, respectively. The optimal mass fraction of R245fa for the minimum entropy generation is 0.6 using R245fa/R152a.
机译：混合物的工作流体可以在热源和散热器下有效地减少能量损失，从而提高有机朗肯循环（ORC）性能。在本研究中已经研究了使用三种混合物（R245FA / R227EA，R245FA / R227EA，R245FA / R152A和R245FA /戊烷）来恢复低级余量热量的基本兽人系统的熵和临床耗散分析。基本ORC包括四个部件：膨胀机，冷凝器，泵和蒸发器。热源温度为120°C，而冷凝器温度为20°C。研究了四种操作参数（蒸发器出口温度，冷凝器温度，夹点温度差，过热程度）以及质量分数的效果被检查在延伸耗散和熵生成中。结果表明，延伸耗散对R245FA的质量分数不敏感。用于R245 /戊烷，R245FA / R152A和R245FA / R227EA的蒸发器的熵产生分布分别为66-74％，68-80％和66-75％，在冷凝器范围内具有相应的熵生成分别为13-21％，4-17％和11-21％，而R245 /戊烷的膨胀器，R245FA / R152A和R245FA / R227EA分别接近13％，15％和14％。使用R245FA / R152A的最小熵生成的R245FA的最佳质量分数为0.6。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号