Need help with 2.3, my lecturers answers say that the efficiency is 55.9% and the T2s is 439.3K. If this is incorrect please elaborate on why, if it is correct please show working. Thank you!
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Need help with 2.3, my lecturers answers say that the efficiency
is 55.9% and the T2s...
Air is compressed steadily by a reversible compressor from an inlet state of 100 kPa and...
Air is compressed steadily by a reversible compressor from an inlet state of 100 kPa and 300 K to an exit pressure of 900 kPa. Determine the compressor work per unit mass for (a) isentropic compression with k 1.4, (b) a compressor with 85% isentropic efficiency, (c) two-stage compression (100 kPa to 300 kPa, and 300 kPa to 900 kPa) with intercooling with an isentropic efficiency of 85% for both compressors. (50 points) 2.
(6). (12 points) A piston-cylinder device contains 0.25 kg of air initially at 1.8 MPa and...
(6). (12 points) A piston-cylinder device contains 0.25 kg of
air initially at 1.8 MPa and 360 °C. The air is first expanded
isothermally to 400 kPa, then compressed polytropically, with a
polytropic exponent of 1.2 to the initial pressure, and finally
compressed at the constant pressure to the initial state. Pease
find: (a) (3p) The boundary work for the isothermal expansion
process. (b) (3p) The boundary work for the polytropic compression
process. (c) (3p)The boundary work for the constant...
Air is compressed steadily by a reversible compressor from 100 kPa and 300 K to 900...
Air is compressed steadily by a reversible compressor from 100
kPa and 300 K to 900 kPa by a 10-kW motor. Assume air is both ideal
and has constant specific heat capacity values determined at room
temperature from Table A-2 at room temperature (300 K).
a) Determine the mass flow rate through the compressor if the
process is isentropic. ( find and identify the work per unit
mass)
b) polytropic with n = 1.2
c) isothermal
d) ideal two-stage polytropic...
1. Saturated R134a vapor enters the uninsulated compressor of a home central air- conditioning system at...
1. Saturated R134a vapor enters the uninsulated compressor of a home central air- conditioning system at 4 °C. The flow rate of R134a through the compressor is 0.1 kg/s, and the electrical power input is 5 kW. The exit state is 65 °C with 1000 kPa. Any heat transfer from the compressor is to the ambient environment at 27 °C. a) Determine the rate of entropy production for the process in kW/K. b) If the change in enthalpy for the...
Problem 1 A diesel engine has a compression ratio r = 20 and uses air as...
Problem 1 A diesel engine has a compression ratio r = 20 and uses air as the working fluid. The state of air at the beginning of the compression process is P1 = 95 kPa and T = 20°C. However, the isentropic expansion normally occuring between state 3 and state 4 is replaced by a polytropic process along which: Pul.35 = constant. The maximum temperature in the cycle is not to exceed 2200 K. In this analysis, the variation of...
Need help for this Brayton Cycle problem. Please help me 4. (30 marks) A gas-turbine power plant operates on the simple...
Need help for this Brayton Cycle problem.
Please help me
4. (30 marks) A gas-turbine power plant operates on the simple Brayton cycle between the pressure limits of 100 kPa and 800 kPa. The T-s diagram of this cycle is shown in Fig. 2. Air enters the compressor at 30°C and leaves at 330°C at a mass flow rate of 200 kg/s. The maximum cycle temperature is 1400 K. During operation of the cycle, the net power output is measured...
A gasoline engine operates on the air standard Otto cycle. The air intake to the engine...
A gasoline engine operates on the air standard Otto cycle. The air intake to the engine is at 300K and 95kPa (State 1). The air is compressed in the engine to an unknown pressure. Heat is then added during combustion at an amount of 1100 kJ/kg. At the end of the heat addition process, the temperature reaches 2200K. Compute the following: (a) the temperature at the end of the compression process, (b) the volumetric compression ratio of this engine, (c)...
I know the correct answers for are: a) 34.36MW b) 0.741 c) 52.2 MW, 870.3 kj/kg...
I know the correct answers for are:
a) 34.36MW
b) 0.741
c) 52.2 MW, 870.3 kj/kg
i am just unsure of the methods.
Question 2 Air enters the compressor of a jet engine at 235 K and 40 kPa, with a flow rate of 60 kg/s and speed of 250 m/s. The exit temperature, pressure and speed are 804 K, 1460 kPa, and 110 m/s, respectively. There is heat transfer from the compressor at a rate of 1.56 MW. The...
Also find thermal efficiency and the mean effective pressure please! Required information An air standard Diesel...
Also find thermal efficiency and the mean effective
pressure please!
Required information An air standard Diesel cycle has a compression ratio of 16 and a cutoff ratio of 2. At the beginning of the compression process air is at 91 kPa and 27C. Account for the variation of specific heats with temperature. The gas constant of air is R-0.287 kJ/kg K. Determine the temperature after the heat addition process. (You must provide an answer before moving on to the next...
Air is compressed steadily by a reversible compressor from an inlet state of 100 kPa and 300 K to an exit pressure of 900 kPa. Determine the compressor work per unit mass for (a) isentropic compression with k 1.4, (b) a compressor with 85% isentropic efficiency, (c) two-stage compression (100 kPa to 300 kPa, and 300 kPa to 900 kPa) with intercooling with an isentropic efficiency of 85% for both compressors. (50 points) 2.
(6). (12 points) A piston-cylinder device contains 0.25 kg of
air initially at 1.8 MPa and 360 °C. The air is first expanded
isothermally to 400 kPa, then compressed polytropically, with a
polytropic exponent of 1.2 to the initial pressure, and finally
compressed at the constant pressure to the initial state. Pease
find: (a) (3p) The boundary work for the isothermal expansion
process. (b) (3p) The boundary work for the polytropic compression
process. (c) (3p)The boundary work for the constant...
Air is compressed steadily by a reversible compressor from 100
kPa and 300 K to 900 kPa by a 10-kW motor. Assume air is both ideal
and has constant specific heat capacity values determined at room
temperature from Table A-2 at room temperature (300 K).
a) Determine the mass flow rate through the compressor if the
process is isentropic. ( find and identify the work per unit
mass)
b) polytropic with n = 1.2
c) isothermal
d) ideal two-stage polytropic...
1. Saturated R134a vapor enters the uninsulated compressor of a home central air- conditioning system at 4 °C. The flow rate of R134a through the compressor is 0.1 kg/s, and the electrical power input is 5 kW. The exit state is 65 °C with 1000 kPa. Any heat transfer from the compressor is to the ambient environment at 27 °C. a) Determine the rate of entropy production for the process in kW/K. b) If the change in enthalpy for the...
Problem 1 A diesel engine has a compression ratio r = 20 and uses air as the working fluid. The state of air at the beginning of the compression process is P1 = 95 kPa and T = 20°C. However, the isentropic expansion normally occuring between state 3 and state 4 is replaced by a polytropic process along which: Pul.35 = constant. The maximum temperature in the cycle is not to exceed 2200 K. In this analysis, the variation of...
Need help for this Brayton Cycle problem.
Please help me
4. (30 marks) A gas-turbine power plant operates on the simple Brayton cycle between the pressure limits of 100 kPa and 800 kPa. The T-s diagram of this cycle is shown in Fig. 2. Air enters the compressor at 30°C and leaves at 330°C at a mass flow rate of 200 kg/s. The maximum cycle temperature is 1400 K. During operation of the cycle, the net power output is measured...
A gasoline engine operates on the air standard Otto cycle. The air intake to the engine is at 300K and 95kPa (State 1). The air is compressed in the engine to an unknown pressure. Heat is then added during combustion at an amount of 1100 kJ/kg. At the end of the heat addition process, the temperature reaches 2200K. Compute the following: (a) the temperature at the end of the compression process, (b) the volumetric compression ratio of this engine, (c)...
I know the correct answers for are:
a) 34.36MW
b) 0.741
c) 52.2 MW, 870.3 kj/kg
i am just unsure of the methods.
Question 2 Air enters the compressor of a jet engine at 235 K and 40 kPa, with a flow rate of 60 kg/s and speed of 250 m/s. The exit temperature, pressure and speed are 804 K, 1460 kPa, and 110 m/s, respectively. There is heat transfer from the compressor at a rate of 1.56 MW. The...
Also find thermal efficiency and the mean effective
pressure please!
Required information An air standard Diesel cycle has a compression ratio of 16 and a cutoff ratio of 2. At the beginning of the compression process air is at 91 kPa and 27C. Account for the variation of specific heats with temperature. The gas constant of air is R-0.287 kJ/kg K. Determine the temperature after the heat addition process. (You must provide an answer before moving on to the next...
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