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# HW_90 - undergraduate programs The two notable exceptions...

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Homework Assignment 9 1. A piston-cylinder device contains 4 kg of R-134a at 900 kPa and 80 ºC. The refrigerant is cooled isobarically until it is at 15 ºC. Determine the amount of heat loss in kJ. 2. The temperature of 3 kg of neon is increased from 40 ºC to 150 ºC. Calculate the change in total internal energy of the neon in kJ. What would be the change in internal energy if the gas was argon? 3. 2 kg of oxygen is heated from 25 to 300 C. Assuming constant specific heats at the average temperature, determine the amount of heat transfer required when this is done during a a. Constant volume process b. Constant pressure process What is the efficiency of both processes? 4. Most of the major engineering departments at TAMU require MEEN 315 during their
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Unformatted text preview: undergraduate programs. The two notable exceptions are Aerospace Engineering and Chemical Engineering. Both these departments have their own introductory thermodynamics courses. Aerospace’s introductory thermo course uses the ratio of specific heats, k, in most of their derivations and treats k as constant. Justify this by demonstrating that k for air is constant over a wide range of temperatures. In particular, determine how much does k change (%) in going from 250 K to 1000 K? How does this compare to how much c v and c p change (%) over the same temperature range? 5. Why does chemical engineering have its own introductory thermodynamics course? Due Wednesday June 23, 2010 10:00AM...
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