An ideal heat engine operates in a cycle and produces work as a result of heat transfer from a thermal reservoir at an elevated temperature T, and by rejecting energy to a thermal sink at T. The efficiency for such an ideal cycle, termed a "Carnot cycle," is n = 1 - (Tc/Th). Determine the required uncertainty in the measurement of temperature to yield an uncertainty in efficiency of 1%. Assume errors are uncorrelated. Use T= 1000 K and T 300 K. %3D

A reversible refrigeration cycle operates between cold and hot reservoirs at temperatures Tc and TH, respectively. (a) If the coefficient of performance is 10 and Tc = -40°F, determine TH, in °F. (b) If Tc = 0°C and TH = 30°C, determine the coefficient of performance. (c) If Qc = 500 Btu, QH=600 Btu, and Tc = 20°F, determine TH, in °F. (d) If Tc = 50°F and TH = 100°F, determine the coefficient of performance. (e) If the coefficient of performance is 5.5 and Tc = -5°C, find TH, in °C. Part A If the coefficient of performance is 10 and Tc = -40°F, determine TH, in °F. TH= i Save for Later °F Attempts: 0 of 4 used Submit Answer

Question 5 A cyclic system exchanges heat with 3 reservoirs. The system receives 990 J from a reservoir at 1,236 Kand 542 J from a reservoir at 766 K. It rejects an unknown quantity of heat to a reservoir at 256 K. What is the maximum possible efficiency of the system? Give your answer as a percentage to 1 decimal place (e.g. 12.3% would be input as 12.3).

Thermodynamics