直管套管内超临界二氧化碳热力性能研究
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国家自然科学基金(51706058); 河北省自然科学基金(B2021208017)


Research of thermal performance of supercritical carbon dioxide in straight pipe casing
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    摘要:

    为了解决气冷器内不可逆损失对换热性能的影响问题,提高直管套管式气冷器的热力性能,对超临界二氧化碳套管式气冷器内二氧化碳与冷却水之间的热量传递过程进行了研究。采用Fluent数值模拟软件与熵产分析方法,通过改变操作压力、二氧化碳质量流量及冷却水的质量流量和进口温度进行数值计算,得出气冷器中二氧化碳和冷却水沿管长的温度分布情况,并依据热力学第二定律熵产分析方法,对直管套管内热力过程进行计算,得出沿管长的熵产分布情况。结果表明,随着压力的增加,沿管长方向的熵产逐渐增大;随着二氧化碳质量流量的增加,熵产逐渐减小;随着冷却水质量流量的增加,熵产增加幅度不明显;随着冷却水进口温度的增加,熵产随之减小。研究结果可为二氧化碳热泵气冷器运行参数与结构的设计以及二氧化碳热泵的工程应用提供一定的参考。

    Abstract:

    In order to solve the problems that the irreversible loss existing in the gas cooler has a great influence on its heat transfer performance,in order to improve the thermal performance of the straight tube tube-in-tube gas cooler,the heat transfer process between carbon dioxide and cooling water in supercritical carbon dioxide tube-in-tube gas cooler was studied.By using Fluent software and entropy generation analysis method,the temperature distribution of carbon dioxide and cooling water along the pipe length was obtained throught changing the operating pressure,carbon dioxide mass flow,cooling water mass flow and inlet temperature;according to the entropy generation analysis method of the second law of thermodynamics,the thermodynamic process in the straight pipe casing was calculated,and the entropy generation distribution along the tube length was obtained.The results show that the entropy production along the tube length increases with the increase of pressure;with the increase of carbon dioxide mass flow,the entropy production gradually decreases;with the increase of cooling water mass flow rate,the increase of entropy production is not obvious;with the increase of cooling water inlet temperature,entropy production decreases.The research result may provide some reference for the operation parameters and structure design of CO2 heat pump gas cooler,as well as for the engineering application of CO2 heat pump.

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崔海亭,黄夏洁,张欣悦,张良锐.直管套管内超临界二氧化碳热力性能研究[J].河北科技大学学报,2021,42(4):424-430

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  • 收稿日期:2020-12-31
  • 最后修改日期:2021-05-10
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  • 在线发布日期: 2021-08-26
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