A power plant has an overall efficiency of 30%. The plant generates 30 MW of electricity, and uses coal from Montana as fuel. Determine how much coal must be burned to sustain the generation of 30 MW of electricity.

A power plant having a Carnot efficiency produces 1000MW of electrical power from turbines that take in steam at 546.4K and eject water at 301.2 K into a flowing river. The water downstream is 6.4C warmer due to the power plant. What is the flow rate (kg/s) of the river?

When a man returns to his well-sealed house on a summer day, he finds that the house is at 35°C. He turns on the air conditioner, which cools the entire house to 20°C in 36 min. If the COP of the air-conditioning system is 2.8, determine the power drawn by the air conditioner. Assume the entire mass within the house is equivalent to 800 kg of air for which cy= 0.72 kJ/kg °C and cp = 1.0 kJ/kg-°C. 35°C 20°C W A/C The power drawn by the air conditioner is kW.