Chapter 9, Problem 9.99P

Example 8.5. Heat flows from a hot reservoir at 800 K to another reservoir at 250 K. H entropy change of the overall process is 4.25 kJ/K, make calculations for the heat flowinger of the high temperature reservoir.

A steam with a quality of 49%, enters an adiabatic nozzle at 3.5 MPa and leaves at 0.4 MPa and 140 oC with a flow of 7 m/s. Find the entrance velocity, in m/s.

A mixture of 40% oxygen and 60% argon by mass flows into a turbine at 1000 K, 400 kPa and expands to 100 kPa. The turbine has an isentropic efficiency of 85%. Find the actual turbine specific work and specific entropy generation assuming constant specific heats.

20. If 10 kg/min of air are compressed isothermally from P1 = 96 kPa and Vi 7.65 m³/min to P2 = 620 kPa, find the work, change in entropy %3D for a non-flow process and a steady flow process with vị = 15 m/s and v2 = 60 m/s.

An adiabatic, steam (H2O) turbine operates in a steady-state, steady-flow manner. With a single inflow and outflow for a mass flow in and out of the turbine. Pressure going into the turbine is 10MPa. The Power output by the turbine is +2045 kWatt and the mass flow rate is 5 kg/sec. Find the Temperature into the turbine.

Question 3: Superheated steam enters a turbine at 7 MPa, 550°C, and exits at 150kPa a. Draw the system. b. If the process is reversible adiabatic (isentropic), find the final temperature (T2), the final enthalpy (h2,) of the steam, and do the energy balance to calculate the turbine work (Wts). c. Using entropy balance, show that Sgen for the above process is 0. d. If the isentropic efficiency is 85%, find the actual final temperature (T23) and calculate Sgen? e. Plot process in (b) and (d) on a Ts diagram with proper labelling.

How do I do this questions in steps? Stuggling with how to find the isentropic work for the efficiency of the turbine. Please have written out or neat solutions that arent copied and pasted math.

This question is about vapor nozzle Due to a failure, ammonia in a large container overheats to 1400 kPa, 573 K. At this state, a small crack opens in the container that acts as a nozzle. The outside environment is at 100 kPa, 298 K, and the mass flow rate of ammonia is 10 g/s . Assume negligible nozzle inlet velocity and adiabatic reversible flow. Determine the exit velocity, and the exit cross section.

Helium at 660 K expands in a turbine to 369 K during which 84 kJ/kg of heat was lost to the surroundings which are at 27 oC. The pressure across the turbine was 6.0, What is the magnitude of entropy generation (kJ/kg.K)?