An irreversible engine operating between the temperatures of 550 K and 300 K extracts 1.20 kJ of thermal energy from the hot reservoir and produces 0.450 kJ of work.How much entropy is created in the process?

Question

Quizplus · Accepted Answer

The entropy created in the process is given by the difference in entropy between the hot and cold reservoirs, which is equal to the heat extracted from the hot reservoir divided by the temperature of the hot reservoir minus the work produced divided by the temperature of the cold reservoir. Therefore, the entropy created is:$$\Delta S = \frac{Q_h}{T_h} - \frac{W}{T_c} = \frac{1.20 	ext{ kJ}}{550 	ext{ K}} - \frac{0.450 	ext{ kJ}}{300 	ext{ K}} = 0.32 	ext{ J/K}$$

An Irreversible Engine Operating Between the Temperatures of 550 K