1. A rigid wall, insulated container is divided into two regions by a removable wall. One region contains 0.1 lbm of CO at 100F, while the other region contains 0.2 lbm of CO at 150?F. A stirrer is inserted into the container and when the wall between the two regions is removed the stirrer provides a shaft work input of 15 Btu. Determine the final temperature of the CO.
2. A balloon containing 0.5 kg of Refrigerant-12 is removed from the freezer at 100 kPa and -40?C and placed on the kitchen counter. Determine the heat transfer required to
(a) raise the R-12 temperature to its boiling point
(b) boil the liquid
(c) raise the resulting vapor to the room temperature of 23?C
You may assume that the kitchen pressure is 100 kPa.
3. Three of the processes that occur in the piston cylinder device of an internal combustion engine are:
Process 1: Constant pressure heat addition during which the volume doubles
Process 2: Isentropic expansion during which the volume increases 9 times
Process 3: Constant volume heat removal to a final pressure of 100 kPa
At the start of process 1 the engine contains 0.035 liters of air at 950 K and 5.7 MPa. For each of the three processes the air undergoes find the work and heat transfer in kJ. What is the total work and heat transfer for all three processes together?