A piston/cylinder of total 1 kg steel contains 0.5 kg ammonia at 1600 kPa, both masses at 120◦C. Some stops are placed that so a minimum volume is 0.02 m³, shown in Fig. P6.137. Now the whole system is cooled down to 30◦C by heat transfer to the ambient at 20◦C, and during the process the steel keeps the same temperature as the ammonia. Find the work, the heat transfer, and the total entropy generation in the process.

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20°C NH, FIGURE P6.137