... change of the system. } Assume for water: c, = 4.2 kJ/kg K C, = 0.7 kJ/kg K K = cp/c, = 1.0 for air: K = cP/c, = 1.4 [432.4 K; 376.7 K] 5 A thermally isolated system ... of the engine is only 50%? Assume for water: c, = 4.2 kJ /kg K C, = 0.7 kJ/kg K 7~ = c~/c, = 1.4 K = c,/c, = 1.0 for air: r385.1 K] Problems 11 6 Show that if a liquid ... and Mayhew tables: at p = 30 bar; t = 450°C u = 3020 kJ/kg; h = 3343 kJ/kg; v = 0.1078 m3/kg; s = 7.082 kJ/kg K Hence the specific availability at these conditions is a =...