流体机械
流體機械
류체궤계
FLUID MACHINERY
2014年
12期
59-63
,共5页
跨临界%CO2 气体冷却器%传热系数%关联式
跨臨界%CO2 氣體冷卻器%傳熱繫數%關聯式
과림계%CO2 기체냉각기%전열계수%관련식
transcritical%CO2 gas cooler%heat transfer coefficient%correlation
CO2气体冷却器的型式和换热效果对 CO2跨临界循环的性能影响较大，有必要对其换热性能进行分析。通过对气体冷却器划分微元，建立了传热过程计算模型，用间接法计算了划分微元与不划分微元时 CO2侧冷却换热系数，并与几个所选换热关联式的计算值进行了比较，结果发现划分微元时的值几乎都高于关联式计算值。综合分析选择了较合适的换热关联式，为系统及气体冷却器的模拟优化提供了依据。进而新建了 CO2热泵实验台，对新气体冷却器的性能进行了测试和比较。结果表明，新 CO2气体冷却器的性能比原换热器有了大幅提高。通过优化达到了改善换热器和系统性能的目的。
CO2氣體冷卻器的型式和換熱效果對 CO2跨臨界循環的性能影響較大，有必要對其換熱性能進行分析。通過對氣體冷卻器劃分微元，建立瞭傳熱過程計算模型，用間接法計算瞭劃分微元與不劃分微元時 CO2側冷卻換熱繫數，併與幾箇所選換熱關聯式的計算值進行瞭比較，結果髮現劃分微元時的值幾乎都高于關聯式計算值。綜閤分析選擇瞭較閤適的換熱關聯式，為繫統及氣體冷卻器的模擬優化提供瞭依據。進而新建瞭 CO2熱泵實驗檯，對新氣體冷卻器的性能進行瞭測試和比較。結果錶明，新 CO2氣體冷卻器的性能比原換熱器有瞭大幅提高。通過優化達到瞭改善換熱器和繫統性能的目的。
CO2기체냉각기적형식화환열효과대 CO2과림계순배적성능영향교대，유필요대기환열성능진행분석。통과대기체냉각기화분미원，건립료전열과정계산모형，용간접법계산료화분미원여불화분미원시 CO2측냉각환열계수，병여궤개소선환열관련식적계산치진행료비교，결과발현화분미원시적치궤호도고우관련식계산치。종합분석선택료교합괄적환열관련식，위계통급기체냉각기적모의우화제공료의거。진이신건료 CO2열빙실험태，대신기체냉각기적성능진행료측시화비교。결과표명，신 CO2기체냉각기적성능비원환열기유료대폭제고。통과우화체도료개선환열기화계통성능적목적。
Types and heat transfer effects of CO2 gas cooler have greater impact on the performance of the CO2 transcritical cy-cle.Therefore,it is necessary to analyze its heat transfer performance.By being divided infinitesimal units for gas cooler,a compu-tational model was established for the heat transfer process.And the cooling heat transfer coefficient of CO2 side was calculated by using the indirect method for dividing and non-dividing infinitesimal.The obtained results were compared with the calculated val-ues from the several selected heat transfer correlations.The results showed that the values from the divided infinitesimal were al-most higher than those from the correlations.By comprehensive analysis,an appropriate heat transfer correlation was chosen to pro-vide the basis for system and the gas cooler simulation and optimization.Then a new CO2 heat pump test rig is built,and the per-formance of the new gas cooler was tested and compared.The results showed that the new CO2 gas cooler performance has been greatly improved over the original heat exchanger.The purpose of improving the heat exchanger and the system performance is a-chieved through optimization.
