• At steady state, a reversible refrigeration cycle discharges energy at the rate QH to a hot reservoir at temperature TH, while receiving energy at the rate ˚C from a cold reservoir at temperature Tc. = 13°C and Tc = 2°C, determine the (a) If TH coefficient of performance (b) If Q₁ = 10.5 kW, Qc = 8.75 kW and TC = 0°C, determine Tч in °C (c) If the coefficient of performance is 10 and TH 27°C, determine TC in °C =
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- The energy output of a heat pump is greater than the energy used to operate the pump. Why doesn't this statement violate the first law of thermodynamics?In a diesel engine, the fuel is ignited without a spark plug. Instead, air in a cylinder is compressed adiabatically to a temperature above the ignition temperature of the fuel; at the point of maximum compression, the fuel is injected into the cylinder. Suppose that air at 20 C is taken into the cylinder at a volume V1 and then compressed adiabatically and quasi-statically to a temperature of 600 C and a volume V2 . If =1.4 , what is the ratio V1/V2 ? (Note: static. In an operating diesel engine, the compression is not quasi-On an adiabatic process of an ideal gas pressure, volume and temperature change such that pV is constant with =5/3 for monatomic gas such as helium and =7/5 for diatomic gas such as hydrogen at room temperature. Use numerical values to plot two isotherms of 1 mol of helium gas using ideal gas law and two adiabatic processes mediating between them. Use T1=500K,V1=1L, and T2=300K for your plot.
- Two moles of a monatomic ideal gas such as oxygen is compressed adiabatically and reversibly from a state (3 atm, 5 L) to a state with a pressure of 4 atm. (a) Find the volume and temperature of the final state. (b) Find the temperature of the initial state. (c) Find work done by the gas in the process. (d) Find the change in internal energy in the process. Assume Cv=5R and Cp=Cv+R for the diatomic ideal gas in the conditions given.A cylinder containing three moles of a monatomic ideal gas is heated at a constant pressure of 2 atm. The temperature of the gas changes from 300 K to 350 K as a result of the expansion. Find work done (a) on the gas; and (b) by the gas.Suppose you want to operate an ideal refrigerator with a cold temperature of 10.0C, and you would like it to have a coefficient of performance 7.00. What is the hot reservoir temperature for such a refrigerator?
- Steam to drive an old-fashioned steam locomotive is supplied at a constant gauge pressure of 1.75106 N/m2 (about 250 psi) to a piston with a 0.200-m radius. (a) By calculating pv , find the work done by the steam when the piston moves 0.800 m. Note that this is the net work output, since gauge pressure is used. (b) Now find the amount of work by calculating the force exerted times the distance traveled. Is the answer the same as in part (a)?• tab (a) How much work is done on the steam when 4.21 mol of water at 100°C boils and becomes.4.21 mol of steam at 100°C at 1.00 atm pressure? (Assume the latent heat of vaporization of waterm 2.26 x 106 J/kg.) kJ aps lock (b) Assume the steam to behave as an ideal gas. Determine the change in internal energy of the system of the water and steam as the water vaporizes. kJ Submit Answer esc ! 1 Q A 1 N 2 $9² F2 W S # 3 X 20 F3 E D $ 69 + 4 C View Previous Question Question 8 of 19 View Next Question F4 R Home F 65 % F5 My Assignments T V MacBook Air 6 G F6 Y B Request Extension & 7 H U * N 00 8 FB 1 ( 9 T J K M ) O O D L V J6 P * . command ¡ 11 1A steam engine is operated in a cold climate where theexhaust temperature is 0°C. (a) Calculate the theoretical maximum efficiency of the engine, using an intakesteam temperature of 100°C. (b) If superheated steamat 200°C were used instead, what would be the maximum possible efficiency?
- Suppose a heat pump has a stationary bicycle attachmentthat allows you to provide the work instead of using anelectrical wall outlet. If your heat pump has a coefficientof performance of 2.0 and you can cycle at a racing pace(Table 15–2) for a half hour, how much heat can youprovide?Air enters a compressor steadily at the ambient conditionsof 100 kPa and 22C and leaves at 800 kPa. Heat islost from the compressor in the amount of 120 kJ/kg and theair experiences an entropy decrease of 0.40 kJ/kgK. Usingconstant specific heats, determine (a) the exit temperatureof the air, (b) the work input to the compressor, and (c) theentropy generation during this process.Not This subject is thermodynamic An ideal gas at 27°C expands isothermally and reversibly from 10 to 1 bar against a pressurethat is gradually reduced. Calculate q,