9–71 Consider an ideal Ericsson cycle with air as the work- ing fluid executed in a steady-flow system. Air is at 27°C and 120 kPa at the beginning of the isothermal compression pro- cess, during which 150 kJ/kg of heat is rejected. Heat transfer to air occurs at 1200 K. Determine (a) the maximum pressure in the cycle, (b) the net work output per unit mass of air, and (c) the thermal efficiency of the cycle. Answers: (a) 685 kPa, (b) 450 kJ/kg, (c) 75.0 percent

Q: Air fills a 2-m-diameter balloon at 20°C and 5 kPa gage. Additional air is forced into the balloon…

A: Given: Diameter of balloon, D1=2 m Temperature, T=20°C Pressure, P =5 kPa

Q: Steam at saturation pressure of 1.75 MPa has a quality of 78%. Find the following properties: a.) v…

A: Write the given data with suitable variables: P=1.75 MPax=78 %

Q: What is the specific volume of the r-134a pressurized 0.5 mpa and 40⁰c temperature using a= a.)…

A:

Q: 4kg of air contained in a piston-cylinder apparatus at 1 bar. 40°c is compressed isothermally untill…

A: Given: Mass of air, m = 4 kg P1 = 1 bar T1 = 40°C or 313 K P2 = 7 bar Required: (a). W ( work done)…

Q: What does the shear flow measure?

A: The shear flow is defined as the shear force per unit length in a thin walled perimeter. The…

Q: Steam is brought from 450 °C and 3000 kPa to 140 °C and 235 kPa. Calculate H and AS for the…

A:

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.