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- 35. A refrigerator consumes 294 KWh of electricity per year. Determine the primary energy requirements in units of MMBTU for the refrigerator assuming: a. The electricity came from a coal power plant with an efficiency of 32%. b. The electricity came from a natural gas plant with an efficiency of 44%.A light bulb has 75% efficiency. How much energy is wasted if the useful output energy of the bulb is 24 J? is the answer... a. 6.0 J b. 8.0 J c. 18 J d. 32 J e. 51J5. A heat engine with a high temp reservoir at 400K has an efficiency of 0.20. What is the max possibletemp of the cold reservoir?
- An 800-MW electric power plant has an efficiency of 30%. It losses its waste heat in large cooling towers. Approximate how much waste heat (in MJ) is discharged to the atmosphere per second? 240. 560. 800. 1 200. 1 900.6. An engine does 10J of work and exhausts 15J of waste heat. (a) what is the efficiency? (b) If the coldreservoir is at 20°C, what is the minimum temperature of the hot reservoir?2. A 70 kg hiker climbed a mountain 1000 m high. He reached the peak in 3 hr. A. Calculate the external work done by the climber. B. Assuming the work was done at a steady rate during the 3 hr period. Calculate the power generated during the climb. -i C. Assuming the average O2 consumption during he climb was 2 liters/min (corresponding to 9.6 kcal/min), find the efficiency of the hiker's body. D. How much energy appeared as heat in the body?
- 7. An engine releases 1675 J of energy per cycle and performs 200J of work. What is the thernal efficiency?10. A gasoline engine has a compression ratio of 6.00 and uses a gas for which ? = 1.40. What is the efficiency if it is operated in an idealized Otto cycle?An engine has a hot reservoir of 520K and a low-temperature reservoir of 330K. What is the theoretical efficiency of this engine? Answer in units of %
- 4. A heat engine operates between energy reservoirs of 75°C and 450°C. What is the maximum efficiency of this heat engine? Express your answer as a decimal, between 0 and 1. 5. A heat engine is operated between two energy reservoirs at different temperatures, where 10,200[J] of thermal energy flows out of the hot reservoir. If the engine has an efficiency of 0.15, what is the work performed by the engine? Express your answer in Joules.1. What is the efficiency of a steam engine if it absorbed an energy of 2.5 x 10$ J from the boiler and gives up 1.5 x 10ºJ in exhausting during one cycle? Solution: Answer:A proposed ocean thermal-energy conversion (OTEC) system is a heat engine that would operate between warm water (16°C) at the ocean's surface and cooler water (4°C) 1,247 m below the surface. What is the maximum possible efficiency of the system? 0.75 % Need Help? Read It Watch It