Chapter 9, Problem 9.55P

A complex flow system expands helium from 1500 K, 1000 kPa to 500 K, 100 kPa. In the process this produces 4595 kJ/kg of work. The process exchanges heat with a reservoir at TR. If the process is reversible, find the unknown reservoir temperature (K). You can work this with either Thermofluids or the equations... Your choice. If equations, Cp=5.19 kJ/kg-K, Cv=3.12 kJ/kg-K, R=2.08 kJ/kg-K. Helium 1500 K 1000 kPa TR q 500 K 100 kPa W=4595 kJ/kg

9. Air is expanded from 400 kPa, 600 K in a polytropic process to 150 kPa, 400 K in a piston cylinder arrangement. Find the polytropic exponent n and the work and heat transfer per kg air using constant heat capacity.

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Q) A chimney of 32 m height has produced a draught of 1.6 cm of water when hot gas temperature is 300°C and ambient temperature is 27°C. The coal used contains 81% carbon, 5% moisture and remaining is ash. Neglecting losses, find the % excess air supplied. Assume complete combustion of carbon in the fuel.

9.13 A steam power plant should produce 10 MW net work. Steam flows at 5 MPa, 500°C to the turbine which has a condenser exit at 50°C. Find the mass flow rate of steam needed. 9.14 For the previous problem find all the specific work and heat transfer terms and the cycle efficiency.

9.68 A nozzle is required to produce a steady stream of R-134a at 240 m/s at ambient conditions, 100 kPa, 20°C. The isentropic efficiency may be assumed to be 90%. Find by trial and error or verify that the inlet pressure is 375 kPa. What is the re- quired inlet temperature in the line upstream of the nozzle?

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Thermodynamics Please help also the tables.

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