A heat engine is supplied with 278 kJ/s of heat at a constant fixed temperature of 283 °C and the heat rejection takes places at 5 °C. Then results reported as: a. 208 kJ/s rejected b. 139 kJ/s rejected Classify which of the results report a reversible cycle or irreversible cycle or impossible cycle.
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- A heat engine receives an amount of energy Qh = 610 kJ by heat transfer from a high temperature thermal reservoir at Th = 840 K. Energy is rejected by heat transfer to a lower temperature thermal reservoir at Tl = 460 K. If the engine develops an amount of work equal to Wcycle = 160 kJ during each cycle answer the following questions. Solve for the actual efficiency that the engine is operating with.A heat engine operates on the Carnot cycle. It produces 50 kW of power while operating between temperature limits of 800°C. Determine the engine efficiency and the amount of heat added.A power cycle receives 5000 Btu by heat transfer from a reservoir at 1500°F and discharges energy by heat transfer to a reservoir at 300°F. The thermal efficiency of the cycle is 75% of that for a reversible power cycle operating between the same reservoirs. (a) For the actual cycle, determine the thermal efficiency and the energy discharged to the cold reservoir, in Btu. (b) Repeat for the reversible power cycle.
- A heat engine is supplied with 278 kJ/s of heat at a constant 6fixed temperature of 283°C and the heatrejection takes place at 5°C. The following results werereported: (i) 208 kJ/s are rejected, (ii) 139 kJ/s arerejected, (ii) 70 kJ/s are rejected.Classify which of the results report a reversible cycle orirreversible cycle or impossible results.A heat engine is supplied with 278 kJ/s of heat at a constant fixed temperature of 283°C and the heatrejection takes place at 5°C. The following results were reported : (i) 208 kJ/s are rejected, (ii) 139 kJ/s arerejected, (ii) 70 kJ/s are rejected.Classify which of the results report a reversible cycle or irreversible cycle or impossible results.PROBLEM 2A household refrigerator has a coefficient of performance of 3 and requires a net powerinput of 0.8 kW. Question:(a) Determine the rate of heat transfer removed from the refrigerated space.(b) Determine the rate of heat transfer discharged from the refrigerator to thesurrounding kitchen.(c) Determine the annual cost in $ for supplying power to the refrigerator assuming24/7 operation and a cost of 12 cents per kWh.
- Heat transferred from the higher and lower temperature reservoirs are and , respectively. Select the coefficient of performance for a heat pump___________ A. 0.67 B. 0.5 C. 1.5 D. 2.01.Refrigerator 1 simulates an ideal refrigerator and therefore operates on a Carnot cycle using R-134a as the refrigerant at a flow rate of 1.4 kg/sec. The condensing and evaporating temperatures are 30 °C and -10 °C, respectively. To assess the performance of Refrigerator 1, you must submit the report. of the project with the following information: a) Enthalpies corresponding to the states indicated in the cycle (1, 2, 3 and 4); b) The cooling rate (Q L ); c) The work supplied to the fluid by the compressor; d) The work generated by the turbine; e) The condenser heat rejection rate (Q H ); f) The coefficient of performance of the cycle. Important detail: For the energy balance, make the following considerations: ✓ Permanent regimen; ✓ Kinetic and potential energy variations are negligible; ✓ Compressor and turbine operate adiabatically; ✓ Evaporation and condensation steps are labor-free.A commercial refrigerator is to cool eggplants from 26 to 5 °C at a rate of 380 kg/h. The power input to the refrigerator is 4.5 kW. Determine (a) the rate of cooling, (b) the COP, (c) the exergy of the heat transferred from the low-temperature medium, and (d) the exergy destruction for the cycle. The specific heat of eggplant above freezing is 3.92 kJ/kg.°C.
- The maximum thermal efficiency possible for a power cycle operating between 1200 F and 225 F is2. A power cycle receives energy QH by heat transfer from a hot reservoir at TH = 1200 R and rejects energy QC by heat transfer to a cold reservoir at TC = 400 R. For each of the following cases, determine whether the cycle operates reversibly, operates irreversibly, or is impossible. (a) QH = 900 Btu, Wcycle = 450 Btu (b) QH = 900 Btu, QC = 300 Btu (c) Wcycle = 600 Btu, QC = 400 Btu (d) Eff. = 70%RESENDING QT - NEED ANSWERS TO REMAINING 3 QTS 1.4, 1.5, 1.6 1.1 Determine the electrical power supplied to a boiler when the temperature of the entering water is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is a negligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specific heat is c = 4,370 J/(Kg K). There is a 1.5(105 ) W rate of heat loss from the boiler during this process to a surrounding at 293.2 k. Consider steady state conditions. 1.2 Calculate the total rate of entropy production in Problem 1.1. 1.3 Calculate the total rate of exergy destruction (W) in Problem 1.1. The dead state temperature is 293.2 K and pressure is 1 bar. 1.4 Calculate the mass flowrate of fuel (natural gas, CH4) required to heat the water flow to the conditions of problem 1.1 if the electrical heating device is replaced with a gas fired boiler. The high heating value (HHV) of the fuel is 50.02 MJ/kg 1.5 Calculate…