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A refrigerator removes heat from a freezing chamber at -8 ⁰F and discharges it at 99 ⁰F. What is its maximum coefficient of performance?
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- A hot gas is injected into an engine at 300°C and exhausts at 70°C . What is the highest efficiency possible of this engine?An electrical power plant has an overall efficiency of 15%. The plant is to deliver 150 MW of electrical power to a city, and its turbines use coal as fuel. The burning coal produces steam at 190°C, which drives the turbines. The steam is condensed into water at 25°C by passing through coils that are in contact with river water. (a) How many metric tons of coal does the plant consume each day (1 metric ton = 1 × 103 kg)? (b) What is the total cost of the fuel per year if the delivery price is $8 per metric ton? (c) If the river water is delivered at 20°C, at what minimum rate must it flow over the cooling coils so that its temperature doesn’t exceed 25°C? Note: The heat of combustion of coal is 7.8 × 103 cal/g.A refrigerator has a coefficient of performance of 3.00. The ice tray compartment is at -10.0°C, and the room temperature is 17.0°C. The refrigerator can convert 22.0 g of water at 17.0°C to 22.0 g of ice at -10.0°C each minute. What input power is required? Give your answer in watts.
- How long would a 5.00 kW space heater have to run to put into a kitchen the same amount of heat as a refrigerator (coefficient of performance = 2.00) does when it freezes 1.25 kg of water at 23.0°C into ice at 0.0°C?An insulated 8-m3 rigid tank contains air at 600 kPa and 400 K. A valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 200 kPa. The air temperature during the process is maintained constant by an electric resistance heater placed in the tank. Determine the electrical energy supplied to air during this process.A separate engine operates with a hot reservoir temperature of 600 K and a cold reservoir temperature of 300 K. What is the maximum or ideal efficiency of this engine?
- What is the coefficient of performance of a refrigerator that operates with Carnot efficiency between temperatures -3.00°C and #27.0°C? E 270K 28 400 ニ Selected Answer:A Carnot heat engine delivers P = 5 x 105 Btu / hr of power while operating between reservoirs at Tc = 470 °F and Th = 1680 °F. a)Write an expression for how much energy it receives per hour from the high temperature thermal reservoir in terms of the absolute temperatures Tc and Th. b) Solve numerically for the amount of energy, in BTUs, that is rejected per hour to the low temperature thermal reservoir.A Carnot heat engine delivers P = 5 x 105 Btu / hr of power while operating between reservoirs at Tc = 470 °F and Th = 1680 °F. a) Write an expression for how much energy it receives per hour from the high temperature thermal reservoir in terms of the absolute temperatures Tc and Th. b) Solve numerically for the amount of energy, in BTUs, that is rejected per hour to the low temperature thermal reservoir.
- A heat engine operates between a reservoir at 29 degrees Celsius and one at 356 degrees Celsius. What is the maximum efficiency possible for this engine?E14 An engineer designs a heat engine using flat-plate solar collectors. The collector deliver heat at 72°C and the engine releases heat to the surroundings at 33°C. What is the maximum possible efficiency of this engine?A heat engine operates between a reservoir at 30°C and one at 422°C. What is the maximum efficiency possible for this engine?