ME351_2011_HW3_Solution

# ME351_2011_HW3_Solution - ME 351- Thermodynamics of Heat...

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ME 351- Thermodynamics of Heat Power Spring 2011 Homework-3-Solution CO 2 P 0 g 1- The piston/cylinder shown in the figure contains carbon dioxide at 300 kPa, 100 ºC with a volume of 0.2 m 3 . Mass is added at such a rate that the gas compresses according to the relation PV 1.2 = constant to a final temperature of 200 ºC. Determine the work done during the process. 2- Each line in the following table gives information about a process of a closed system. Each entry has the same energy units. Fill in the blank spaces in the table. Process Q W 1 E 2 E E A -70 -80 +70 +80 +10 B +15 -70 +20 +105 +85 C -90 -90 +50 +50 0 D -60 -20 +130 +90 -40 E +50 +150 +20 -80 -100 For PV n =constant and n 1, work can be derived as; n V P V P dV P W 1 1 1 2 2 2 1 2 1 Assuming CO 2 as ideal gas T R m V P Work equation can be written in terms of temperatures as;   n T T R m n V P V P W 1 1 1 2 1 1 2 2 2 1 Using the initial values mR can be found as 1608 . 0

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## This document was uploaded on 05/26/2011.

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ME351_2011_HW3_Solution - ME 351- Thermodynamics of Heat...

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