Chapter 8, Problem 8.5CU

A simple steam power plant operates on 8 kg/s of steam as shown below. Neglecting losses in the various components. A. What is the turbine power output in kW?B. What is the pump power requirement in kW?C. If the pump is 70% efficient what is the power output in kW.D. What is the heat transfer rate necessary in the boiler?E. What is the thermal efficiency of the cycle? Use the equation below.η = (turbine power output – pump power requirement) / (boiler heat transfer rate).

Reference Book: Introduction to Chemical Engineering Thermodynamics by Smith, Van Ness, etc. 7th or 8th Ed.

3) The pump works (wbomba) and the turbine (wurbina). 4) The heats: boiler (QH) and condenser (QL). 5) The thermal efficiency of this cycle.

2. Explain the differences between an engine that operates on a thermal cycle and an engine that operates on a mechanical cycle

A two-stage piston-cylinder system compresses propane from 7 kPa to 17 bar in a refrigeration system. The compression ratio is the same in both stages. The suction temperatures for the first and second stages are −29 °C and 27 °C. a) Calculate the isentropic work required in each stage of the propane compressor and the discharge temperature. b) Heat transfer in the intercooler.

Octane is used as the working fluid in a gas-flow refrigeration cycle. The pressure ratio of the system is 5 and the octane enters the compressor at -15 oC. Fluid temperature at turbine inlet It is 70 oC. By accepting the adiabatic efficiency of the compressor and turbine as 80%; a) the flow diagram of the cycle, T-s diagram of the cycle, b) turbine inlet temperature, c) the efficiency coefficient of the cycle, d) find the highest and lowest temperatures of the cycle and e) find the required amount of fluid for 10 kW cooling load.

Q1/ Explain the reasons why the Diesel station is superior to the thermal power station? mention it?

d) the thermal efficiency (%) of the cycle. e) Sketch the cycle on a T-s diagram, showing all states and processes. Assume the compressor and turbine isentropic efficiencies are both 80% and that the regenerator effectiveness is 70%.

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