表冷器处理空气过程,风量18000m3/h,空气t1=25℃,ts1=20.2℃,t
题型:单项选择题
问题:
表冷器处理空气过程,风量18000m3/h,空气t1=25℃,ts1=20.2℃,t2=10.5℃,ts2=10.2℃,水量为20t/h,冷水tw1=7℃,水比热4.2,空气密度1.2kg/m3,求冷水终温和表冷器热交换效率系数ξ1数值应为下列何项
A.11.7~12.8℃,0.80~0.81
B.12.9~13.9℃,0.82~0.83
C.14~14.8℃,0.80~0.81
D.14.9~15.5℃,0.78~0.79