A rock bed consists of 12000 lbm granite and is at 160 F. A small house with lumped mass of 24000 lbm wood and 2000 lbm iron is at 60 F. They are now brought to a uniform final temperature with no external heat transfer.
a. For a reversible process, find the final temperature and the work done in the process.
b. If they are connected thermally by circulating water between the rock bed and the house, find the final temperature and the irreversibility of the process assuming that surroundings are at 60 F.