0.90 L of 25 °C water is placed in a refrigerator. The refrigerator's motor must supply an extra 9.0 W power to chill the water to 5°C in 1.0h. What is the refrigerator's coefficient of performance?
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A: Given data :- Intake temperature T1 = 157° C = 430 K Exhaust temperature T2 = 100° C = 373 K
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- A heat engine operating at steady state delivers a power output of 17 hp. The engine receives energy by heat transfer in the amount of Qh = 33 kJ during each cycle of operation from a high temperature thermal reservoir at Th = 870 K. The system is executing 50 cycles per minute. Determine the amount of work that is delivered during each cycle in kilojoules. Determine the actual efficiency at which the system is operating. Assuming this engine is as efficient as possible, what would the temperature, in degrees celsius, of the colder reservoir be?Consider a heat engine transferring energy from a warm region (Tw) to a cool region (Tc) . Which combination of temperatures will result in the highest efficiency? a. Tw = 500 K, Tc = 400 K b. Tw = 500 K, Tc = 300 K c. Tw = 500 K, Tc = 450 K d. Tw = 300 K, Tc = 300 KThe coefficient of performance for a freezer is 8.2 i)How much heat must be extracted by the freezer to expel 2.5 kJ of heat into the reservoir? ii) If the freezer compressor uses 310 J of energy, how much heat is extracted from the reservoir?
- *72. mmh How long would a 3.00-kW space heater have to run to put into a kitchen the same amount of heat as a refrigerator (coefficient of performance into ice at 0.0 °C? 3.00) does when it freezes 1.50 kg of water at 20.0 °CA heat pump has a coefficient of performance 3.0. How much heat is exhausted to the hot reservoir when 300 kJ of heat are removed from the cold reservoir?What is the Carnot efficiency (in percent) of a heat engine operating between the temperatures of 350°C (623 K) and 130°C (403 K)? %
- heat pump operates on a Carnot cycle between the cool exterior of a house and the warminterior. When the exterior temperature is 2.0 °C and the interior temperature is 20.0 °C.a) What is the coefficient of performance for the heat pump?b) The heat pump delivers 63 MJ of energy to the interior of the house. How much energy input isrequired in the form of work?A heat engine provides a net power output of 14 kW and has an efficiency of 23 %. The engine rejects 1200 J of energy per cycle to a low temperature reservoir. a)Determine the amount of heat delivered to the engine from the high temperature reservoir per second. Your answer should be in units of Watts. b)Determine the required number of cycles per minute executed.A Carnot heat engine operates with an efficiency η=0.5 between a hot reservoir at temperature T1 and a cold reservoir at temperature T2=300 K. Calculate the temperature T1 of the hot reservoir. Select one: a.T1=150.0 b.T1=300.0 c.T1=900.0 d.T1=600.0
- What is the Carnot efficiency of a heat engine operating between the temperatures of 10 C and 100C? Include Units .Calculate the efficiency of a heat engine operating between two reservoirs at temperatures T₁ = 400 K and T₂ = 300 K. Select one: O a. η = 0.25 - Ο b. η = 3.0 O c. n = 4.0 O d. n = 0.33333333333333A refrigerator has a coefficient of performance of 2.9. Hint If it requires 180 J of work per cycle, how much heat per cycle does the refrigerator remove from the cold reservoir? QL=QL= JJ How much heat per cycle is expelled into the hot reservoir? QH=QH= J