Question

In: Mechanical Engineering

QUESTION NO 1 In an Otto cycle air is compressed from an initial pressure 120 kPa...

QUESTION NO 1

In an Otto cycle air is compressed from an initial pressure 120 kPa and temperature (T = 380). The cycle has compression ratio of 10. In the constant volume heat, addition process 1000 kJ/kg heat is added into the air. Considering variation on the specific heat of air with temperature, determine,

(a) the pressure and temperature at the end of heat addition process (show the points on P-v diagram)

(b) the network output

(c) the thermal efficiency

(d) the mean effective pressure for the cycle

The gas constant of air is R = 0.287 kJ/kg.K.

(Describe the necessary assumptions you have considered in your solutions.)

QUESTION NO 2

Repeat Q1 using cold air standard assumption.

(Properties: The properties of air at room temperature are cp = 1.005 kJ/kg·K, cv = 0.718 kJ/kg·K, R = 0.287 kJ/kg·K, and k = 1.4)

Solutions

Expert Solution

samet mamat answered 1 year ago
Next > < Previous

Related Solutions

In an Otto cycle air is compressed from an initial pressure 120 kPa and temperature 370...
In an Otto cycle air is compressed from an initial pressure 120 kPa and temperature 370 T (K). The cycle has compression ratio of 10. In the constant volume heat addition process 1000 kJ/kg heat is added into the air. Considering variation on the specific heat of air with temperature, determine, (a) the pressure and temperature at the end of heat addition process (show the points on P-v diagram) (b) the network output (c) the thermal efficiency (d) the mean...
In an Otto cycle air is compressed from an initial pressure 120 kPa and temperature 370...
In an Otto cycle air is compressed from an initial pressure 120 kPa and temperature 370 T (K). The cycle has compression ratio of 10. In the constant volume heat addition process 1000 kJ/kg heat is added into the air. Considering variation on the specific heat of air with temperature, determine, (a) the pressure and temperature at the end of heat addition process (show the points on P-v diagram) (b) the network output (c) the thermal efficiency (d) the mean...
I need solving question 2 only? Q1. In an Otto cycle air is compressed from an...
I need solving question 2 only? Q1. In an Otto cycle air is compressed from an initial pressure 120 kPa and temperature 350 (K). The cycle has compression ratio of 10. In the constant volume heat addition process 1000 kJ/kg heat is added into the air. Considering variation on the specific heat of air with temperature, determine, (a) the pressure and temperature at the end of heat addition process (show the points on P-v diagram) (b) the network output (c)...
Air is compressed from an inlet condition of 100 kPa, 300 K to an exit pressure...
Air is compressed from an inlet condition of 100 kPa, 300 K to an exit pressure of 1000 kPa by an internally reversible compressor. Determine the compressor power per unit mass flow rate if the device is (a) isentropic, (b) polytropic with n =1.3, (c) isothermal.
Air is compressed from an inlet condition of 100 kPa, 300 K to an exit pressure...
Air is compressed from an inlet condition of 100 kPa, 300 K to an exit pressure of 1000 kPa by an internally reversible compressor. Determine the compressor power per unit mass flow rate if the device is (a) isentropic, (b) polytropic with n =1.3, (c) isothermal.
Air of 0.5 kg mass is compressed in a piston-cylinder device from 300 K, 120 kPa...
Air of 0.5 kg mass is compressed in a piston-cylinder device from 300 K, 120 kPa to 500K, 940 kPa. (a) Determine the entropy change in kJ/K using (i) approximate analysis and (ii) exact analysis. (b) Determine the direction of heat transfer (into the device or out of the device).
Air is compressed from 100 Kpa and 22 C to an outlet pressure 8 times greater....
Air is compressed from 100 Kpa and 22 C to an outlet pressure 8 times greater. The compressor is not well insulated and loses heat at a rate of 120 kJ/kg. It is also note that there is a decrease in the entropy of the air of 0.4 kJ/kg-K between the inlet & the outlet. Assuming constant specific heats determine a) The outlet air temperature b) The required work input (kJ/kg) c) The entropy generation sgen (kJ/kg-K) during the compression...
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...
Thermodynamics problem: An engine operates on an air-standard Otto cycle. The pressure and temperature of the...
Thermodynamics problem: An engine operates on an air-standard Otto cycle. The pressure and temperature of the isentropic compression 100 kPa and 40 °C, respectively. The pressure at the end of compression is 2.0 MPa and the net work is 87,000 J/mol. Assume ideal air-standard cycle. Determine the following: pressure, volume, and temperature at end of each step. compression ratio. heat input and heat rejected per mol of working fluid. thermal efficiency of the cycle.
A cold air-standard Otto cycle has a compression ratio of 6 and the temperature and pressure...
A cold air-standard Otto cycle has a compression ratio of 6 and the temperature and pressure at the beginning of the compression process are 520°R and 14.2 lbf/in.2, respectively. The heat addition per unit mass of air is 500 Btu/lb. Assume constant specific heats evaluted at 520°R. Determine: (a) the maximum temperature, in °R. (b) the maximum pressure, in lbf/in.2 (c) the percent thermal efficiency. (d) the mean effective pressure, in lbf/in.2
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT