流体机械

2022, v.50;No.600(06) 31-38

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CO_2跨临界双级循环制冷系统最优中间压力的热力学分析
Thermodynamic analysis of optimum intermediate pressure in a refrigerated cabinet with CO_2 transcritical two-stage cycle

王栋,梅申功,陈卓,李晨辉,夏曦,汪祥支
WANG Dong,MEI Shengong,CHEN Zhuo,LI Chenhui,XIA Xi,WANG Xiangzhi

摘要(Abstract):

为提升CO_2双级循环制冷系统的性能,基于一套CO_2跨临界双级循环冷柜系统,通过建立能量热力学模型和?热力学模型,计算其最优中间压力值,并采用实验结果来验证模拟结果的准确度,最后对整个系统的热力学性能进行模拟研究。研究结果表明:模型在预测最优中压方面具有很高的准确度,在试验工况下,误差仅为1.91%;高低压的几何平均值比最优中间压力值略低,偏差在3%左右;相对于高压来讲,CO_2跨临界双级循环制冷系统的COP对中压不太敏感;气冷器出口温度对系统性能影响较大,温度超过限值后,系统性能急剧下降,在本文的研究范围内,该温度为36 ℃。本研究可以为小型CO_2跨临界双级循环制冷系统的优化设计及如何维持系统高效运行提供理论指导。
In order to improve the performance of CO_2 two-stage cycle refrigeration system,based on an existing refrigerated cabinet with CO_2 transcritical two-stage cycle,the energy thermodynamic model and exergy thermodynamic model were established to calculate the optimum intermediate pressure.Then,relevant experimental test was conducted to validate the accuracy of simulation results.Finally,the thermodynamic performance of the entire system was studied by simulation.The research results indicate that the present model has enough accuracy in predicting the optimum medium pressure of a CO_2 transcritical two-stage system,and the error is only 1.91% under experimental conditions.The geometric mean value of low and high pressures is slightly lower than the optimum intermediate pressure value and the error is about 3%.Compared with the high pressure,the COP of CO_2 transcritical two-stage cycle refrigeration system is not sensitive to intermediate pressure.The outlet temperature of the gas cooler has a greater effect on the system performance,which would decrease rapidly when the temperature exceeds the limit value.Under the range of conditions in present work,the temperature is 36 ℃.This study can provide theoretical guidance on how to optimally design a small refrigeration system with CO_2 transcritical two-stage cycle and how to maintain its efficient operation.

关键词(KeyWords): 双级循环;CO_2;跨临界;中间压力;热力学分析
two-stage cycle;CO_2;transcritical;intermediate pressure;thermodynamic analysis

Abstract:

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基金项目(Foundation): 安徽省高校自然科学研究重点项目(KJ2017A055)

作者(Author): 王栋,梅申功,陈卓,李晨辉,夏曦,汪祥支
WANG Dong,MEI Shengong,CHEN Zhuo,LI Chenhui,XIA Xi,WANG Xiangzhi

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