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sample problems for monday june 7(2)

# sample problems for monday june 7(2) - Todaysome classical...

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Today…some classical problem types Rigid tank with ideal gas and non-ideal fluid, closed system, constant volume and mass so average specific volume is constant. No moving boundary work. Piston Cylinder device with ideal gas and non-ideal fluid, closed system. In one case we are isobaric (constant pressure process) and in the second, we define the end of the process. In the last problem today, we look at a piston cylinder device with a polytropic process and an ideal gas. The material for exam one will cover up through today’s lecture and chapter 5. Don’t forget the closed book quiz on Wednesday…10 pts to add to your homework grades…the two energy equations. We will cover entropy as a property before we launch into engineering devices on Wednesday. Then we’ll start on the analysis of several other engineering devices including compressors, turbines, diffusers, nozzles, throttling valves and heat exchangers. We’ll use the energy equation to evaluate these devices. Following the analysis of the engineering devices, we will start integrating these into systems and study the Otto cycle (gasoline engine), the Diesel cycle, the Brayton cycle, the Rankine cycle and the refrigeration cycle.

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Consider a rigid tank problem with an ideal gas: Q – W other – W mb = m ( u + ke + pe) 1000 liters in volume Gas is air T 1 = 25 deg C P 1 = 150 kPa A paddle wheel situated in the tank provides 20 Watts for power input to the gas for 5 minutes. The tank loses 0.1 Watt of heat to the surroundings during this 5 minute period. What is the final temperature and pressure in the tank at the end of 5 minutes?
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sample problems for monday june 7(2) - Todaysome classical...

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