An ideal Otto cycle has a compression ratio of 7. At the beginning of the compression process, P1 = 90 kPa, T1 = 27°C, and V1 = 0.004 m3 . The maximum cycle temperature is 1127°C. For each repetition of the cycle, calculate the heat rejection and the net work production. Also calculate the thermal efficiency and mean effective pressure for this cycle. Use constant specific heats at room temperature.

An ideal Otto cycle has a compression ratio of 7. At the beginning of the compression process, P1 = 90 kPa, T1 = 27°C, and V1 = 0.004 m3 . The maximum cycle temperature is 1127°C. For each repetition of the cycle, calculate the heat rejection and the net work production. Also calculate the thermal efficiency and mean effective pressure for this cycle. Use constant specific heats at room temperature.

Similar questions

A heat engine operates under the following thermodynamic cycle:A→B: isobaric expansion(P=const.)B→C: isochoric cooling(V=const.)C→A: isothermal compression(T=const.)The engine is operated by nmoles of oxygen, a diatomicgas which behaves like an ideal gas without any appreciable vibrational kinetic energy.The thermodynamic cycle described by the gas is entirely defined by pressures PAand PC, and volume VA. Assume that PC=PA/2and give all your answers in terms of n, R, PAand VA. b)Sketch the cycle on a P-Vdiagram and determine all the unknown pressures, volumes and temperatures. c)Determine the efficiency of this engine, defined by e =Wnet/Qin.Wnetis the net work done by the gas over a full cycle and Qinis the total heat that flows into the gas.Be careful, Qindoes not include the heat released by the gas.
Q1: The peak pressure in an otto cycle is 21 bar. With a compression ratio of 5 and the minimum pressure of 1 bar; determine (a) thermal efficiency; (b) mean effective pressure. Assume the working substance as air with Y-1.4.
Shown below is the PV-diagram for a clockwise cycle. Determine the work done during the cycle, the heat flow during the cycle, & the change in internal energy during the cycle. P (N/m²) 10- 8 W = Q = AU = 4 2 V (m³) 2 4 6 8 10
Combustion gases enter an adiabatic gas turbine at 1540F and 120 psia and leave at 60 psia with a low velocity. Treating the combustion gases as air and assuming an isentropic efficiency of 82 percent, determine the work output of the turbine.
p (kPa) Он 400 5) The figure shows a pV diagram for a cycle of a heat engine for which Q, = 25 J. What is the thermal efficiency of the engine? 200 (Hint: remember to convert cm³ to m³!) A) 17% B) 34% C) 8.5% D) 64% E) 40% 100 V (em³) 200
A 3 mole sample ideal gas is confined in a cylinder that is carried through a closed cycle. The gas is initially at 70 atm and at 300 K. First, its pressure is tripled under constant volume. Then, it expands isothermally to its original pressure. Finally, the gas is compressed isobarically to its original volume (see the figure) . What was the net work done (in MJ) on the gas for this cycle? (Hint: clockwise cycle causes negative work done) (Answer 2 decimal places) 3P, Isothermal P V(L) Vc
A Carnot cycle working between 100 °C and 30 °C is used to drive a refrigerator between −10 °C and 30 °C. How much energy must the Carnot engine produce per second so that the refrigerator is able to discard 10 J ofenergy per second?
What is the thermal efficiency of a Carnot cycle operating between 52oC and 352oC? 84% 56% 48% 15% none of the listed values. 73%
A certain coal-fired power plant has a rated power capacity of P = 850 MW. The output of this plant is W = 0.21QH, where QH is the energy input as heat from the hot reservoir. a) Which would increase the efficiency more, doubling QH or reducing QC by half? b) Calculate the maximum thermal efficiency of the power plant. c) Calculate the absolute value of the exhausted heat (QC) each second in MJ for the power plant. d) If the power plant operates for a full day at its rated capacity, how much energy QH in MJ is needed? e) If, on average, one ton of coal contains Q = 25 GJ of energy, how many tons nH of coal would the plant need to operate for a day at its rated capacity? f) How many tons nC of this coal is exhausted as wasted heat to QC in a single day?