Saturated steam at 2MPa flows in a 7.5 cm diameter pipe for a distance of 300m. The steam flow rate entering the pipe is 2500kg/hr. Due to heat loss from the pipe to the surrounding air (at 25 C) 20 kg/hr of condensate is formed in the pipe and removed at the end of the pipe. The remaining steam (2480 kg/hr) goes to a steam turbine that has an efficiency of 70% and a discharge pressure of 200KPa.
1) The heat transfer from the pipe to the surrounding atmosphere is ____
2) The total rate o entrophy change of the flowing stream from inlet to exit is ___
3) The entropy change of the surrounding air due to the heat transfer is ___
4) What is the maximum work that could be extracted from the turbine if it was reversible?
5) What is the actual work from the turbine?
6) What is the actual entropy at the turbine exit?