Refrigerant 134a is being held in a rigid, spherical tank (r=0.5m). Initially, the R-134a has a temperature of 263K and a specific internal energy of 110.6kJ/kg. A thermal reservoir (T=308K) is brought in contact with the tank, transferring enough heat to the tank to raise the pressure inside to 4 bar. Calculate the entropy changes of the refrigerant and the thermal reservoir, and total change in entropy for this process.