A reversible power cycle operating as in the figure receives energy QH by heat transfer from a hot reservoir at TH and rejects energy Qc = 40 Btu by heat transfer to a cold reservoir at Tc = 40°F. The work for the cycle Wcycle = 30 Btu. Determine the thermal efficiency and TH. in °F. Hot reservoir Cold reservoir Он 4

A reversible power cycle operating as in the figure receives energy QH by heat transfer from a hot reservoir at TH and rejects energy Qc = 40 Btu by heat transfer to a cold reservoir at Tc = 40°F. The work for the cycle Wcycle = 30 Btu. Determine the thermal efficiency and TH. in °F. Hot reservoir Cold reservoir Он 4

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter45: Domestic Refrigerators And Freezers

Section: Chapter Questions

Problem 12RQ: Refrigerators currently being manufactured in the United States are using______as their refrigerant.

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A reversible power cycle operating as in the figure receives energy QH by heat transfer from a hot reservoir at TH and rejects energy Qc = 10 Btu by heat transfer to a cold reservoir at Tc = 40°F. The work for the cycle Wcycle = 30 Btu. Determine the thermal efficiency and TH, in °F. Step 1 Determine the thermal efficiency. n = i % Hot reservoir Cold reservoir Он Wcycle
A reversible power cycle operating as in the figure receives energy QH by heat transfer from a hot reservoir at TH and rejects energy Qc = 10 Btu by heat transfer to a cold reservoir at Tc = 40°F. The work for the cycle Wcycle = 3O Btu. Hot reservoir Weycle Cold reservoir Determine the thermal efficiency and TH, in °F.
The maximum thermal efficiency possible for a power cycle operating between 1200 F and 225 F is
Air within a piston-cylinder assembly executes a Carnot heat pump cycle, as shown in the figure below. For the cycle, TH = 400 K and Tc = 300 K. The energy rejected by heat transfer at 400 K has a magnitude of 625 kJ per kg of air. The pressure at the start of the isothermal expansion is 325 kPa. TH Te p-v diagram for a Carnot gas refrigeration or heat pump cycle. Assuming the ideal gas model for the air, determine: (a) the magnitude of the net work input, in kJ per kg of air, and (b) the pressure at the end of the isothermal expansion, in kPa.
Referring to the reversible heat pump cycle shown in the figure, p₁ = 14.7 lb/in², p4 = 20.3 lb/in², v₁ = 12.6 ft³/lb, v4 = 10.0 ft³/lb, and the gas is air obeying the ideal gas model. P4 P1 Determine TH, in °R, and the coefficient of performance. V4 VI TH V
Air within a piston-cylinder assembly executes a Carnot heat pump cycle, as shown in the figure below. For the cycle, TH = 400 K and Tc = 300 K. The energy rejected by heat transfer at 400 K has a magnitude of 625 kJ per kg of air. The pressure at the start of the isothermal expansion is 325 kPa. Tc p-v diagram for a Carnot gas refrigeration or heat pump cycle. Assuming the ideal gas model for the air, determine: (a) the magnitude of the net work input, in kJ per kg of air, and (b) the pressure at the end of the isothermal expansion, in kPa.
Consider the re-heat regenerative cycle as shown in the figure below:Suppose that the boiler operates at a constant pressure of 15MPa. The High Pressure turbine expands steam until 4MPa. The Low-pressure turbine then achieves expansion to 700 kPa and 20 kPa. Determine the specific work of Pump II in kJ/kg. a.3.66 b.0.69 c.15.23 d.15.84
Carnot heat engine which produces 10 kJ of work for one cycle has a thermal efficiency of 50 percent. The working fluid is 0.50 kg of air, and the pressure and volume at the beginning of the isothermal expansion are 7 bars and 0.119 m3, respectively. Find a. the maximum and minimum temperatures for the cycle, in degrees Kelvin,  b. the net work , and c. the volume at the end of the isothermal expansion process , in m3.
Heat engine and refrigerator. Consider a heat engine operating between temperatures Th and Tj. During each cycle with time At, work W is extracted, so Pout = W/At. (a) Assuming the processes are all reversible, what is the efficiency of this heat engine, n = Wout/Qn? (b) Now assume that the low temperature of the heat engine is lowered by a reversible refrigerator, such that the heat engine operates between Th and T. The refrigerator takes input power Pin = Win/At and operates between T and T, where Ti < T. Draw an energy- entropy flow diagram. (c) Calculate the net efficiency (Wout - Win)/Qh. Is the efficiency of this system higher, lower, or the same as your answer for (a)?
A Carnot power cycle operates on 3lb of air between the limits of 8000F and 6000F. Thepressure at the beginning of isothermal expansion is 400 psia and at the end of isothermal expansionis 195 psia. Determinea. the volume at the end of isothermal compression,b. ∆S during an isothermal process (the ratio of compression during isothermal heating andthe overall ratio of expansion,c. Compute the heat added (QA), heat rejected (QR), work (W) and cycle efficiency (full solution pls)
The compression ratio of an engine working on the constant volume cycle is 9.3. At thebeginning of compression, the temperature is 31°C and at the end of combustion thetemperature is 1205°C. Taking the compression and expansion process to be adiabatic andthe value of k as 1.4. Determine the following a. T2. 741.7657 Kb. T4. 605.733 Kc. Thermal Efficiency. 59.02%
Referring to the reversible heat pump cycle shown in the figure, p₁ = 14.7 lby/in². Pa = 34.7 lb/in², v₁ = 12.6 ft3/lb, v4 = 7.0 ft³/lb, and the gas is air obeying the ideal gas model. Step 1 Determine TH. in °R, and the coefficient of performance. Determine TH. in °R. TH= i Save for Later P4 °R PI V4 VI Ty Attempts: 0 of 4 used Submit Answer Activa Go to Se