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EGR 334 Thermodynamics:   Homework 18

Problem 4: 95

A turbine operating at a steady state that provides power to an air compressor and an electric generator. Air enters the turbine with a mass flow rate of 5.4 kg/s at 527 deg C and exits the turbine at 107 deg C, 1 bar. The turbine provides power at a rate of 900 kW to the compressor and at a rate of 1400 kW to the generator.   Air can be modeled as an ideal gas, and kinetic and potential energy changes are negligible. Determine

1. a) the volumetric flow rate of the air at the turbine exit, in m³/s and
2. b) the rate of heat transfer between the turbine and its surroundings in kW.

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EGR 334 Thermodynamics:   Homework 18

Problem 4: 98

A refrigeration system consists of a heat exchanger, an evaporator, a throttling valve, and associated piping. Data for steady state operation with R134a are given in the figure. There is no significant heat transfer to or from the heat exchanger, valve, and piping. Ignore KE and PE. Determine the rate of heat transfer between the evaporator and its surroundings in Btu/h.

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EGR 334 Thermodynamics:   Homework 18

Problem 4: 102

Steady state operating data for a simple steam power plant are provided in the figure. Stray heat transfer, KE and PE effects are small. Determine

1. a) thermal efficiency
2. b) mass flow rate of cooling water in kg/kg of stream flowing.

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