Lecture 23 Examples

# Lecture 23 Examples - Example 1 Water in a piston-cylinder...

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Example 1: Water in a piston-cylinder device is heated from V 1 = 0.05 m 3 to V 2 = 0.09 m 3 at a constant pressure of 240 kPa. If the cylinder contains 2.4 kg of water, how much heat is transferred during the process? If the heat source is a reservoir at a constant temperature of 500 K, how much entropy is generated in the process?

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Example 2: After graduation you take a job with the Acme energy services company. Your first job is to purchase high efficiency heat pumps. The heat pumps employ mechanical power and a heat engine to provide heat at T H = 100 °C. A low temperature heat sink at T C = 20 °C is also available. A salesman shows
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Unformatted text preview: you two models. Performance data for each model operating at steady state is provided below: Example 3: Consider the following schematic of a steam generator and a turbine in coal-burning power plant. The operating conditions at steady state are given below: P 2 = xxx kPa, T 2 = xxx °C, ° = xxx kg/s, T 3 = xxx °C, P 4 = xxx kPa Assuming the turbine is adiabatic and reversible, calculate the temperature and quality of the fluid at its exit. Calculate the amount of entropy generated in the steam generator if the combustion process can be modeled as a heat source at a constant 700°C....
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