Problem: What is the net annual savings if the sawdust is burned?
Given: A large furniture plant develops 10 tons of sawdust (6,000
Btu/ton) per day that is presently hauled to the landfill for
disposal at a cost of $10/ton. The sawdust could be burned
in a boiler to develop steam for plant use. The steam is
presently supplied by a natural gas boiler operating at 78%
efficiency. Natural gas costs $5/MMBtu. Sawdust handling
and in-process storage costs for the proposed system would
be $3/ton. Maintenance of the equipment will cost an estimated
$10,000 per year. The plant operates 250 days/yr. A

Question