Question

In: Mechanical Engineering

For the following, assume air is an ideal gas with constant specific heats at 300K. Find...

For the following, assume air is an ideal gas with constant specific heats at 300K. Find the work and heat transfer and state whether they are into or out of the air.

In an open system, air is heated at constant pressure from 27°C, 400 kPa to 500K.

w = 0 kJ/kg, q = 201 kJ/kg

In a closed system, air is heated at constant pressure from 27°C, 100 kPa to 500K.

w = 57.4 kJ/kg, q = 201 kJ/kg

Solutions

Expert Solution


Related Solutions

The working gas of a thermodynamic cycle is air(assume constant specific heats.)The gas originally starts at...
The working gas of a thermodynamic cycle is air(assume constant specific heats.)The gas originally starts at 100kPa, 4m3and 27oC. It undergoes a four step process:Process A-B: The gas is compressed at constant temperature to one-fourth of its volume. Process B-C: The volume of the gas is then doubled at constant pressure. Process C-D:The gas then undergoes an adiabatic expansion.Process D-A:The gas then undergoes a constant volume process back to its original statea) Make a table of the temperature, pressure, volume,...
An ideal gas has a constant volume specific heat cv as a function of temperature. Find...
An ideal gas has a constant volume specific heat cv as a function of temperature. Find the change in internal energy and enthalpy if the gas is heated from a temperature of 300K to 600K. cv(T) = 716.66 + 0.4T + 0.000667T2 J/kg.K Also, sketch the constant pressure specific heat as a function of temperature and mention the point T = 400K on the cp – T diagram. Assume that the gas constant of the given ideal gas is 286.9...
2 kilograms of ideal gas air undergoes an isothermal expansion from 3MPa and 300K to 1Mpa....
2 kilograms of ideal gas air undergoes an isothermal expansion from 3MPa and 300K to 1Mpa. Determine the work done, the change in specific internal energy, and the heat transferred.
a) Calculate the change in entropy on heating an ideal gas from 300K to 500K at...
a) Calculate the change in entropy on heating an ideal gas from 300K to 500K at constant pressure. b) Calculate the change in entropy on heating an ideal gas from 300K to 500K at constant volume. c) why these answers are different. Please explain each steps.
An air engine is modeled after the ott cycle. Assume ideal gas and air standard cold...
An air engine is modeled after the ott cycle. Assume ideal gas and air standard cold valus for properties. Intake air is at 100kPa and Temperature of 27°C. The compression ration is 8:1. The heat added during ignition is 1740 kJ/kg a) Draw and Label the Pv and Ts diagrams for the Otto cycle b)Find the specific volume at intake state #1 c) Find the temperature at the end of the compression stroke d) Find the Pressure at the end...
For these problems, assume air behaves as an ideal gas with R=0.287kJkgK. A compressor operates at...
For these problems, assume air behaves as an ideal gas with R=0.287kJkgK. A compressor operates at steady state and takes in air from ambient 0 kPa, gage and 200 K. The outlet pressure is 60 kPa, gage and 400 K. Determine: the mass flow rate if the inlet area is 20 cm2 and the inlet pressure is -5 kPa, gage. the minimum outlet temperature that is possible for this compressor. the isentropic efficiency of the compressor, assuming no heat loss....
What is the ideal gas law constant?
What is the ideal gas law constant?please give details.
A gas turbine operates as a cold-air standard Brayton cycle. Air enetrs the compressor at 300K...
A gas turbine operates as a cold-air standard Brayton cycle. Air enetrs the compressor at 300K and 100kPa and is compressed to 700kPa. During the heat addition process in the combustor, the temperature of the air increases to 1000K. The turbine and compressor can be assumed to be operating isentropically. Evaluate specific heat at 300K. a. thermal efficiency of the cycle? b. net work of the cycle (kj/kg)? c. Back work ratio?
Find the Gibbs free energy for G(T,P) for an ideal gas with constant cv.
Find the Gibbs free energy for G(T,P) for an ideal gas with constant cv.
Which of the following are key aspects of the ideal gas model? A) The specific internal...
Which of the following are key aspects of the ideal gas model? A) The specific internal energy depends on temperature only. B) The specific enthalpy of a gas depends on temperature only. C) Z = 1 is adequately satisfied. D) All of the above.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT