The pressure ratio λ = 1.5 in the process of isochoric heat supply for the cycle...

The pressure ratio λ = 1.5 in the process of isochoric heat supply for the
cycle of an internal combustion engine with a mixed supply of heat =
1034 kJ/kg and the compression ratio = 13. Find the thermal efficiency
and temperature at the characteristic points of the cycle if the initial
parameters are 0.09 MPa and 70 ◦C and the working substance is air.

Ans: (i) ηth = 57.5% (ii) T2 = 956.9 K
(iii) T3 = 1435.5 K (iv) T4 = 2122.86 K
(v) T5 = 890 K

Expert Solution

samet mamat answered 2 days ago

The efficiency of the Brayton cycle increases with an increase in the pressure ratio across the...

The efficiency of the Brayton cycle increases with an increase in the pressure ratio across the compressor. What limits our use of this tactic to increase cycle efficiency? What trade-offs have to be made? plase typr the answer no hand writing

The compression ratio is 8 in an engine working with the ideal Otto cycle. The heat...

The compression ratio is 8 in an engine working with the ideal Otto cycle. The heat transfer to the engine takes place from a heat source at a temperature of 1000 ° C and the heat transfer from the engine to the outside takes place in the environment of 20 ° C and 100 kPa. At the start of the isentropic compression process, the temperature is 50 ⁰C and the pressure is 110 kPa. The temperature at the end of...

why is pressure constant for the combustion process of a diesel cycle?

The compression ratio is 10 in the air standard Otto cycle. Pressure at the beginning of...

The compression ratio is 10 in the air standard Otto cycle. Pressure at the beginning of the compression stroke is 1XY kPa and the temperature is 15 ºC. The heat transfer to the air for each cycle is 18XY kJ / kg air. Draw the T-s and P-v diagrams. (x=9 y=8). Note: Accept that specific temperatures do not change with temperature. Take k = 1.4 and Cp = 1.0031 kJ / kg-K. a) For question 1, we draw the temperature...

The pressure ratio of a Brayton cycle with air operated regenerator is 8. The lowest and...

The pressure ratio of a Brayton cycle with air operated regenerator is 8. The lowest and highest temperatures of the cycle are 310 K and 1150 K. The adiabatic efficiency of the compressor and turbine is 75% and 82%, respectively, and the efficiency of the regenerator is 65%. Show the cycle in the T-s diagram. Consider the variation of specific temperatures with temperature. a) Calculate the temperature of the air at the turbine outlet, b) Net work of the cycle,...

A gas refrigeration cycle with a pressure ratio of 4.3 uses helium as the working fluid....

A gas refrigeration cycle with a pressure ratio of 4.3 uses helium as the working fluid. The temperature of the helium is 26°C at the compressor inlet and 50°C at the turbine inlet. Assuming isentropic efficiencies of 87 percent for both the turbine and the compressor, determine (a) the minimum temperature in the cycle, (b) the coefficient of performance, and (c) the mass flow rate of the helium for a refrigeration rate of 20 kW. ans a)198.76 b)0.574 c)0.0564. Can...

a simple ideal Brayton cycle with air as the working fluid has a pressure ratio of...

a simple ideal Brayton cycle with air as the working fluid has a pressure ratio of 10. The air enters the compressor at 520 R and the turbine at 2000 R. Accounting for the variation of specific heats with temperature, determine (a) the ait temperature at the compressor exit, (b) the back work ratio, and (c) the thermal efficiency.

The pressure ratio of a power plant operating according to the ideal brayton cycle is 8....

The pressure ratio of a power plant operating according to the ideal brayton cycle is 8. Gas temperature 300K at compressor inlet, at the entrance of the turbine is 1300K. Using air standard acceptance and taking into account the change of specific temperatures with temperature, a.) Calculate the temperature of the gas at the compressor and turbine outlet. b.) Calculate the thermal efficiency of the cycle. c.) Calculate the backward work rate.

A gas refrigeration cycle with a pressure ratio of 4 uses helium as the working fluid....

A gas refrigeration cycle with a pressure ratio of 4 uses helium as the working fluid. The temperature of the helium is -6°C at the compressor inlet and 50°C at the turbine inlet. Assume isentropic efficiencies of 88 percent for both the turbine and the compressor. (Given: The properties of helium are cp= 5.1926 kJ/kg·K and k = 1.667.) FIND: a. The minimum temperature of the cycle. b. The coefficient of performance. c. the mass flow rate of the helium.

A Carnot-cycle refrigerator rejects heat at the pressure of 1000 kPa during which the working fluid...

A Carnot-cycle refrigerator rejects heat at the pressure of 1000 kPa during which the working fluid R -134a changes from saturated vapor to saturated liquid. The heat is added to the cycle at the pressure of 320 kPa. Show the cycle in a T-s diagram and determine the coefficient of performance of the cycle using a) the first law of thermodynamics b) the Carnot cycle efficiency equation and c) the T-s diagram.

Question