Question

A wooden bucket (2 kg) with 10 kg hot liquid water, both at 85°C, is lowered 400 m down into a mineshaft. What is the availability of the bucket and water with respect to the surface ambient at 20°C? 

Answer 1

C.V. Bucket and water. Both thermal availability and potential energy terms. 

v₁ ≈ v₀ for both wood and water so work to atm. is zero.

Use constant heat capacity  for wood and (sat. liq.) for water.