CAJ | 학술논문

本文对含有 PAG 润滑油的 CO2气体冷却器建立了理论模型，通过人工神经网络对含油的 CO2对流换热系数进行预测，通过与实验结果进行比较，验证了模型的准确性。进一步分析和计算结果表明；气冷器的热效率随管道的长度的增加而增大，但增幅逐渐放缓。对于实际使用的气冷器，考虑设备运行的经济性，应合理设计气冷器的长度。对于小管径的气冷器(Dh ≤2 mm)，少量的润滑油(ω≈1﹪)即会明显削弱气冷器的传热系数与热效率；但对于大管径的气冷器(Dh≥4 mm)，少量的润滑油对气冷器的影响不明显。在实际小管径气冷器运行过程中，要尽量降低进入气冷器中的润滑油含量，以保证气冷器较高的换热性能。气冷器的热效率随 CO2侧压力的增加而增大，但增幅逐渐变缓。 CO2侧压力越接近临界压力，由于润滑油的存在导致气冷器热效率降低的幅度越大，并且气冷器的管径越小，降低幅度越明显。
본문대함유 PAG 윤활유적 CO2기체냉각기건립료이론모형，통과인공신경망락대함유적 CO2대류환열계수진행예측，통과여실험결과진행비교，험증료모형적준학성。진일보분석화계산결과표명；기랭기적열효솔수관도적장도적증가이증대，단증폭축점방완。대우실제사용적기랭기，고필설비운행적경제성，응합리설계기랭기적장도。대우소관경적기랭기(Dh ≤2 mm)，소량적윤활유(ω≈1﹪)즉회명현삭약기랭기적전열계수여열효솔；단대우대관경적기랭기(Dh≥4 mm)，소량적윤활유대기랭기적영향불명현。재실제소관경기랭기운행과정중，요진량강저진입기랭기중적윤활유함량，이보증기랭기교고적환열성능。기랭기적열효솔수 CO2측압력적증가이증대，단증폭축점변완。 CO2측압력월접근림계압력，유우윤활유적존재도치기랭기열효솔강저적폭도월대，병차기랭기적관경월소，강저폭도월명현。
A theoretical model of CO2 gas cooler with PAG lubricant was developed.The heat transfer coefficient was predicted based on artificial neural network, and then the model was validated with experimental results.Further calculation shows that the thermal effective_ness increases with the length of the gas cooler tube, but the increase rate decreases gradually.Therefore, the length of the gas cooler tube should be properly designed considering the economical running in the practical applications.For the gas cooler with a smaller diameter (Dh ≤ 2 mm), a small amount of lubricant significantly deteriorates the thermal effectiveness while for that with a larger diameter (Dh≥ 4 mm), the influence is not so apparent.Consequently, the oil concentration should be decreased as far as possible to keep high heat transfer performance of the small diameter gas cooler.The gas cooler performances better at higher CO2 side pressure.However, the in_crease rate of the thermal effectiveness decrease gradually as the pressure increases.At pressure approaching to the critical pressure, the degradation of the thermal effectiveness is more significant.Additionally, the deterioration is more apparent as the diameter decreases.