Chapter 8, Problem 8.21P

A heat exchanger is used to cool an air flow from 900 to 400 K, with both states at 1 MPa. The coolant is water flow at 20 degrees C and 0.1 MPa. If the water leaves a saturated vapor, find the ratio of the flow rates (mass flowwater/mass flowair.

Hint, find enthalpy, entropy at each state

Ao air turbine with one intet and one exit operates at Steady State, and has heat trans fer to the Surroundings at an average 3.0x' 10" J per ka of air flowing. The inlet conditions are 980°K and 400 kPa, and the exit conditions are 670°k and 100 kla. Neglect kinetic and potential energy e ffects and use the ideal gas madel without assumung constant specific heats, to calculate the entropy producHon per mass of air flowing. Pres ent your answer in kJ/ (kgʻk) wsing 5 Signifigant figures. outer surface temperature of 315°k ät the rate of

Steam is delivered to turbine at 5.4 MPa and 600 degree C. Before condensation at 31 degree C, steam is extracted for feed water heating at 0.6 MPa. The turbine exhaust is 60 degree C. the required values of some state point properties are tabulated below. 10. Calculate the net work of the cycle.

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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.

1 mol of ideal gas was isothermally compressed but irreversible @130degreecelcius from from 2.5 to 6.5 bar in a piston. The needed work is 30%>reversible work of this process (isothermal). The transferred heat from gas flows to heat sink @25degcelcius during the compression. Find entrophy changes, total entropy and the heat sink.

The steam expands isentropically in a simple impulse turbine from 12 bar, 250°C with an enthalpy of 2035 k.J/kg to an enthalpy of 2584 ki/kg 2t 0.1 bar. The nozzle makes 20° with blade motion and the blades are symmetrical. Calculate the blade velocity that produces maximum efficiency for turbine speed of 3600 rom. Assume that the steam enters the nozzle with negiigible velocty.

I have been working on this problem for a while but I need to figure out how to get the specific enthalpy when the refridgerant exits the system to find the mass flow rate of when the refridgerant exits the system but I don't know how to do this