At a place where the surroundings are at 1 bar, 270C, a closed rigid thermally insulated tank contains 2 kg air at 2 bar, 270C. This air is then churned for a while, by a paddle wheel connected to an external motor. If it is given that the irreversibility of the process is 100 kJ, find the final temperature and the increase in availability of air. Assume for air Cv = 0.718 kJ/kg K