4 1 Do not use Cp, CV, or k on this exam. you need an internal energy, enthalpy, or entrop 2 the value should come from the steam, R-134a, or gas tables in your book. 3 4 1) (30 pts) Oxygen (O2) flows through a pipe, entering at 3.5 m/sec at 5000 kPa, 227C. 5 For a pipe inside diameter of 3.5 cm, find the volumetric flow rate (m/sec) and the 6 mass flow rate of the gas (kg/sec) assuming you have an ideal gas 7 8 Then using your ideal gas mass flow rate find the rate at which enthalpy enters the pipe (kJ/sec) 9 NO Cp, Cv, k permitted - use the gas tables in the text book !!! 0 Note: this problem has almost nothing to do with the new material in MEM 410. 21 2 2) (35%) Superheated ammonia (NH3, MolWt = 17.03 kg/kmol) at 20C and 300 kPa 3 has a specific volume of 0.46078 m/kg (based on tabular data) 24 5 a) Estimate the pressure in kPa on the basis of the ideal gas law using 6 the values given for temperature and specific volume. 27 8 b) Estimate the pressure in kPa on the basis of van der Waals equation using 9 the values given for temperature and specific volume. 0 Calculate the "a" and "b" constants as shown in our text. 31 52 3 3) (35 pts) a) Using steam at 60 Mpa and 500 C, find the steam table value for specific volume. 4 b) Assuming that steam can be considered as an ideal gas at this pressure and temperature, 5 find the specific volume and give the per cent error using the steam table value as the correct one. 6 c) Use the compressibility chart to determine the specific volume of steam at this pressure 7 and temperature and give the per cent error using the steam table value as the correct one. 8 Include your compressibility chart as part of your solution - be VERY neat