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首页> 外文期刊>Energy Conversion & Management >Experimental research on the influence of system parameters on the composition shift for zeotropic mixture (isobutane/pentane) in a system occurring phase change
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Experimental research on the influence of system parameters on the composition shift for zeotropic mixture (isobutane/pentane) in a system occurring phase change

机译：系统参数对相变过程中共沸混合物（异丁烷/戊烷）组成变化影响的实验研究

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摘要

Zeotropic mixture can improve the performance of the thermodynamic cycle ascribed to the better temperature match during the heat transfer process with the characteristics of temperature glide during evaporation and condensing processes. Another characteristic of zeotropic mixture is composition shift. Composition shift means that the circulating composition and charge composition is different and is mainly caused by the two-phase hold-up and different solubility in lubricating oil. The existence of composition shift will affect the design and operation of thermodynamic system. The previous study gave little information about the influence of system parameters on the composition shift in a system occurring phase change. This paper mainly discuss the influence of system parameters on the composition shift for zeotropic mixture in a system occurring phase change as well as the validation of the linear relationship between the circulating composition and the charge composition and the inverse proportion relationship between the circulating composition and the charge mass found based on our previous theory study (Zhao and Bao, 2014). With isobutane and pentane as the research object, the impact of the key system parameters (hot water temperature, mass flow rate of hot water, feed pump frequency, cold water temperature and evaporator length) on composition shift are experimentally carried out. The results show that when the hot water temperature, mass flow rate of hot water and evaporator length increase and cold water temperature decreases, circulating composition will increase. For feed pump frequency, when the outlet of evaporator is in two phase region, and circulating composition will decreased with the increase of feed pump frequency; while the outlet of evaporator is in a state of overheating, circulating composition will increase as the feed pump frequency rises. The linear relationship between the circulating composition and the charge composition and the inverse proportion relationship between the circulating composition and the charge mass are verified by the experiment. (C) 2016 Elsevier Ltd. All rights reserved.
机译：共沸混合物可以改善热力学循环的性能，这归因于在传热过程中具有更好的温度匹配，并且在蒸发和冷凝过程中具有温度滑移的特性。共沸混合物的另一个特征是组成变化。组成变化是指循环组成和装料组成不同，主要是由两相滞留和在润滑油中的溶解度不同引起的。成分转移的存在会影响热力学系统的设计和运行。先前的研究几乎没有提供有关系统参数对系统发生相变时组成变化的影响的信息。本文主要讨论了系统参数对发生相变的系统中共沸混合物组分迁移的影响，以及循环组分与电荷组分之间线性关系的验证和循环组分与电荷组分之间反比关系的验证。电荷质量是根据我们先前的理论研究得出的（Zhao和Bao，2014年）。以异丁烷和戊烷为研究对象，实验研究了关键系统参数（热水温度，热水质量流量，进料泵频率，冷水温度和蒸发器长度）对组成变化的影响。结果表明，当热水温度，热水质量流量和蒸发器长度增加而冷水温度降低时，循环成分会增加。对于给水泵频率，当蒸发器的出口处于两相区域时，循环组成会随着给水泵频率的增加而减少；当蒸发器的出口处于过热状态时，随着进料泵频率的升高，循环成分将增加。通过实验验证了循环组成与装料组成之间的线性关系以及循环组成与装料质量之间的反比例关系。 （C）2016 Elsevier Ltd.保留所有权利。

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