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4. An iron tank, which is fitted with a freely moving piston, has a wall thickness of 40cm, a surface area of 1m2, and is painted from the outside with a white paint. The tank initially contains 0.1m3 of saturated liquid refrigerant at 10C. Taking into consideration the thermal radiation effect and considering the surrounding air temperature to be 45C with a convective heat transfer coefficient of 10W/m2.K, find (a) the outside surface temperature of the tank and (b) the rate of heat transfer during the process, (c) the amount of work done during the process and (d) how long it takes to completely evaporate the refrigerant. [Ans. 12.53C,507.6W,2543.2kJ,13.16hr ]