Question
word problem thermo:
A piston-cylinder device contains 20 kg of R-134a at 2.8 bar and 90 degree C. Now R-134a is allowed to be compressed at constant pressure until it becomes a saturated vapor draw a T- v diagram, label the saturated temperature, the specific volumes and the temperatures of the initial and final states Determine the work done during this expansion process, in kJ. calculate the amount of heat that transferred into the piston, in kJ Four moles of carbon dioxide in a sealed container undergoes the thermodynamic cycle as shown in the figure. If the process BC is an isothermal, how much work is done by the gas in this cyclic process, in J.
Explanation / Answer
4) Work = 1*(1-4) + 4ln(4) = 2.545 J
