Section: Thermodynamics | Type: NAT | Marks: 2
A piston-cylinder device initially contains 1 m3 of air at 200 kPa and 25 ℃. Air expands at constant pressure while a heater of 250 W is switched on for 10 minutes. There is a heat loss of 4 kJ during this process. Assuming air as an ideal gas, the final temperature of air is ____________ ℃ (rounded off to one decimal place). Use the following data for air: R = 0.287 kJ/kg-K, cp = 1.005 kJ/kg-K
Answer: 85.0 to 88.0