解：（1）X?w1?0.5?1kg水/kg干料
11?w11?0.5 X?2w20.01??0.0101kg水/kg干料 1?w21?0.01 GC?G(1?w1)?20?(1?0.5)?10kg干料/s
查焓～湿图：t2?50℃，?2?60%时，H2?0.0495kg水/kg干气 则： V?GC(X1?X2)?10?(1?0.0101)?222kg干气/s
干H2?H10.0495?0.005 V?V干(H1?1)?222?(1?0.005)?223kg/s （2）∵ 理想干燥器内进行的过程为等焓过程，∴ I1
?I2
(1.01?1.88H1)t1?2490H1?(1.01?1.88H2)t2?2490H2(1.01?1.88H2)t2?2490(H2?H1)?t1?1.01?1.88H1 ?(1.01?1.88?0.0495)?50?2490?(0.0495?0.005)1.01?1.88?0.005干燥器热效率：???w(H2?H1)
I1?I0?162.8?C
查得：t2?50℃，?2?60%时，tw?42℃，?w?2395kJ/kg
I1?I0?(1.01?1.88H0)(t1?t0)?(1.01?1.88?0.005)?(162.8?25)?140.47kJ/kg干料?(0.04?95 ∴ ??2395140.470.005)
?75.87%