37. A certain gas with Cp = 2.215 KJ/kg °K and R= 0.518 KJ/kg °K with a volume of 0.425m3 and 300 °K has an initial pressure of 106.869 KPa.Heat is added at constant volume until the final pressure becomes 387.72 KPa. How much heat is added?

A rigid container contains saturated vapour at 1.6 bar.  The container is cooled by -440 KJ and the pressure drops to 1 bar.  Calculate the mass of water in the container in kg.  Neglect kinetic and potential energy changes. Note that the reported heat transfer is negative because energy is leaving the container. It is closed system As the container is rigid, the volume and total mass will stay the same between the initial and final state.  This means that the specific volume of water will stay constant.  Use the information in the bullet above to fine the quality of the mixture at the final state. Then, use the quality to perform the energy balance.

On a T-V diagram sketch the constant specific volume through the reference state (state 0) T = 250C, v = 1.1989 m^3/kg from T1 = 350C to T2 = 120C. Sketch the constant pressure curves through the states so that they extend form the compressed liquid region to the superheated region. Places states on diagram along with their temperatures, pressures, and specific volumes on the diagram axes. The fluid is water.

This fixed-mass system undergoes an isothermal, quasi-equilibrium process from state 1 to state 2. The initial volume is 1 m^3. The mass inside the system is an unspecified ideal gas. Initial Pressure starts at 1000 kPa and the final pressure goes to 100 kPa. Find the change in specific internal energy the work done on the system and the heat transfer in KJoules.