Question

Wet green lumber containing 12.5 percent moisture is fed continuously to a drying oven at a rate of 10 ton h-‘. The drying oven consists of two kilns, operated in series. From the first kiln the “partially dried” lumber is fed to a second. Tests on the second show that the final dried lumber leaving contains 4.0 percent moisture. Also, 650 lb, h-’ of moisture are removed from the entering lumber in the second kiln.

(a) Find the lb, h-’ of “dried” lumber exiting from the second kiln.

(b) Find the lb, h-’ of water removed in the first kiln.

(c) What is the percentage moisture in the “partially dried” lumber exiting Erom the first kiln?

Answer 1