Chapter 6, Problem 6.42P

How does heat transfer and energy transformations make heat engines like geothermal plants work?

Determine the energy required to convert 3 kg of ice at -10 oC to saturated vapor at 100 oC. The specific heat of ice is 2,050 J/kg K, specific heat of water is 4,180 J/kg K, latent heat of fusion of ice is 333.2 kJ/kg, latent heat of vaporization of water is 2,257.06 kJ/kg. What is the energy required to convert ice at -10 oC to ice at 0 oC? What is the energy required to convert ice at 0 oC to water at 0 oC? What is the energy required to convert water at 0 oC to water at 100 oC? What is the energy required to convert water at 100 oC to vapor at 100 oC?  What is the total energy required to convert 5 kg of ice at -10 oC to saturated vapor at 100 oC?

Heat is supplied at a constant rate to 0.550 kg of ice at -15.0°C in a very light container. Specific heat capacity of ice: 2.01 x 10° J.(kg.K)'. The ice starts to melt after 20.8 minutes. (a) Find the rate of heat received by the ice (in J/minute). (b) Knowing that after 250.8 minutes from the time when the heating is first started, the temperature begin to rise above 0.0°C. What is the latent heat of fusion of ice? (c) Plot a diagram showing the change of temperature as a function of the time. Explain clearly each stage of all the process.