管式间接蒸发空气冷却器传热传质模型的建立及验证.docx

管式间接蒸发空气冷却器传热传质模型的建立及验证 3王芳武俊梅黄翔汪周建(西安工程大学)摘 要 回顾和分析现有间接蒸发冷却器的热工性能和数学模型 ,并在分析管式间接蒸发空气冷却器传热、传质过程及特点的基础上 ,建立针对管式间接蒸发空气冷却器热工计算模型。基于模型中管外二次空 气侧空气与水膜之间的传热、传质系数是影响模型精度的重要因素 ,对管外二次空气侧空气与水膜之间的 传热、传质系数进行深入分析 ,将模型用于水平单管外蒸发传热、传质系数的计算 ,并将计算结果与文献中 的实验数据进行对比 ,证明所选模型的正确性 ,为下一步对管式间接蒸发空气冷却器整体热工性能的数值 模拟奠定坚实的基础。关键词 管式间接蒸发空气冷却器 ;模型 ;传热传质Development and verif icat ion of the heat and ma ss transf er modelf or tube2type indirect eva porat ive a ir coolerWa ng Fa ngWu J unmeiH ua ng Xia ngWa ng Zho ujia n( Xi’a n Pol yt ech nic U niver sit y)ABSTRACTReviewe s a nd a nal yze s t he t he r mal p erfo r ma nce a nd mat he matical mo del ofi ndi rect evapo rative cooler . Ba sed o n t he a nal ysi s of t he heat a nd ma ss t ra n sf e r p roce sse s of i ndi rect evapo rative ai r cooler , e st a bli she s t he t he r mal p erfo r ma nce mo del fo r t u be2t yp e i ndi rect evapo rative ai r coole r . Due to t he heat a nd ma ss t ra n sf e r co efficie nt s bet wee n t he seco nda r y ai r a nd wat e r fil m a ro und t he t ube a re t he mo st i mpo rt a nt f acto r s to t he accura2 cy of t he e st a bli shed mo del , so select s a nd mo difie s ca ref ull y t he heat a nd ma ss t ra n sf e r coefficie nt s bet wee n t he seco nda r y ai r a nd wat er fil m a ro und t he t ube u se d i n t he p re se nt mo del t hro ugh deep a nal ysi s. App lie s t he mo difie d co r relatio n to co mp ut e t he heat a nd ma ss t ra n sf e r coefficie nt s bet wee n t he f lo w do w n wat e r2fil m a nd co untf lo w ai r a ro und a si ngle ho rizo nt al t ube . Co mp a re s t he co mp ut e d re sult s gai ned f ro m t he mo dified co r rela2 tio n wit h t he e xp e ri me nt al dat a f ro m t he lit e rat ure , a nd ve rifie s t he acc uracy of mo dified co r relatio n . Pro vi de s t he fir m ba si s fo r t he follo wi ng n umerical si mulatio n of t he o verallt he r mal f erfo r ma nce of t he t ube2t yp e i ndi rect evapo rative ai r cooler .KEY WO RDSt ube2t yp e i ndi rect ev