Problem 2: Refrigerator Suppose that heat leaks into your kitchen refrigerator at an average rate of 300W. Assuming ideal operation, how much power does it require to operate?
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- 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 = 0.33333333333333Increasing the temperature of the hot reservoir of a Carnot-cycle engine will increase the efficiency of the engine. a) True b) FalseA reservoir at a temperature of 480 K gains 110 J of heat from another reservoir. What is its entropy change AS? AS = J/K
- em 5 A NATO base in northern Norway is warmed with a heat pump that uses 7.0°C ocean water as the cold reservoir, Heat extracted from the ocean water warms fluid to 80° C; this warmed fluid is used to heat the building When the system is working at full capacity, 2000 kW of heat are delivered to the building at the cost of 600 kW of electric energy. Part A What is the actual coefficient of performance of the system? COP Submit Request Answer Part B What is the theoretical maximum coefficient of performance of the system? COPX Submit Request Answar P Type here to searchwhat is true about the coal-powered steam locomotive? A- it is an example of an external combustion engine. B- it’s an example of an internal combustion engine.9) A heat pump is used to move heat from 10°C air outside, to a 22 °C air inside. The practical coefficient of performance of this pump is 4.1, and it uses 12000 J of electric energy. a) Find the energy this system adds to the house. b) Find the theoretical (maximum) coefficient of performance for this system. 5
- A thermodynamic process can be represented using a PV diagram where the pressure and volume at every stage is recorded. In the thermodynamic process shown below the work done by the system is РА A O the area under the PV curve and positive the area under the PV curve and negative B is the product of the change in volume during the process and the change in pressure. cannot be found from the PV graphDuring each cycle a reversible engine absorbs 2500 J of heat from high-temperature reservoir and performs 2200 J of work. i) What is the efficiency of this engine? ii) How much heat is exhausted to the low-temperature reservoir during each cycle?Steam locomotives have an efficiency of 15.0% and operate with a hot steam temperature of 475°C. (a) What would the cold reservoir temperature (in °C) be if this were a Carnot engine? °C (b) What would the maximum efficiency of this steam engine be if its cold reservoir temperature were 150°C? % Additional Materials B Reading ds Scanned with CamScanner