CAJ | 학술논문

基于换热平衡方程和空气动力方程的耦合关系，建立无侧风条件下，自然通风湿式冷却塔的热力性能计算模型，并利用MATLAB程序，通过迭代运算方法，对两方程进行联立求解，从而获得与现场测试相同的气象和运行条件下，剔除侧风影响后冷却塔通风量和冷却数的应达值，然后结合现场测试得到的实际通风量和冷却数，提出了可以特异地反映侧风对冷却塔性能影响的新指标。某3500 m2冷却塔的计算结果表明，在模型散热量和实测散热量相同的条件下，侧风影响会使得冷却塔的通风量最大减少38.5％，此时体积分数为33.9％的填料没有得到有效利用，侧风还会增加冷却塔的冷却任务，相应的，需要冷却塔具有更好的冷却性能，这对于了解侧风对冷却塔性能的影响以及指导冷却塔的设计与改造有重要意义。
기우환열평형방정화공기동력방정적우합관계，건립무측풍조건하，자연통풍습식냉각탑적열력성능계산모형，병이용MATLAB정서，통과질대운산방법，대량방정진행련립구해，종이획득여현장측시상동적기상화운행조건하，척제측풍영향후냉각탑통풍량화냉각수적응체치，연후결합현장측시득도적실제통풍량화냉각수，제출료가이특이지반영측풍대냉각탑성능영향적신지표。모3500 m2냉각탑적계산결과표명，재모형산열량화실측산열량상동적조건하，측풍영향회사득냉각탑적통풍량최대감소38.5％，차시체적분수위33.9％적전료몰유득도유효이용，측풍환회증가냉각탑적냉각임무，상응적，수요냉각탑구유경호적냉각성능，저대우료해측풍대냉각탑성능적영향이급지도냉각탑적설계여개조유중요의의。
Computational model of natural draft wet cooling tower ( NDWCT) under no crosswind condition was built based on the coupling equations of heat and aerodynamic balance.The two equations were solved by the method of iter-ation using MATLAB code, so as to calculate the ideal values of airflow rate and number of transfer unit ( NTU), which neglect crosswind effect under the same meteorological and operating conditions as field tests.Then by combining the actual values of airflow rate and NTU of tests, new indexes were recommended to represent the specific effect of cr-osswind on tower performance.The results of a 3 500 m2 NDWCT showed that, at the same heat loss of model and test, the airflow rate decreased 38.5%at most by crosswind, and simultaneously 33.9%volume fraction of fill was not em-ployed efficiently.Crosswind also increased the cooling duty of NDWCT and hence more cooling capacity was needed, which was of great help to understand the theory of crosswind effect on the tower performance and of significance for cooling tower design and modification.