Engineering, 15.04.2020 02:55 slauravillalta
A mass of 15 kg of air in a piston-cylinder device is heated from 25 to 77 °C by passing current through a resistance heater inside the cylinder. The pressure inside the cylinder is held constant at 300 kPa during the process, and a heat loss of 60 kJ occurs. Determine the electrical energy supplied
Answers: 1
![W_{heater} = 60\,kJ + (15\,kg)\cdot \left[\left(0.718\,\frac{kJ}{kg\cdot ^{\textdegree}C} \right)\cdot (77\,^{\textdegree}C- 25\,^{\textdegree}C) + (300\,kPa)\cdot \left(0.346\,\frac{m^{3}}{kg}-0.295\,\frac{m^{3}}{kg} \right)\right]](/tpl/images/0600/9163/23005.png)
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A mass of 15 kg of air in a piston-cylinder device is heated from 25 to 77 °C by passing current thr...
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