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Prbset03

# Prbset03 - CHEMICAL ENGINEERING THERMODYNAMICS COURSE NO...

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CHEMICAL ENGINEERING THERMODYNAMICS COURSE NO.: CHEG5301 STUDENT: ___________________ COURSE: Thermodynamics INSTRUCTOR: Prof. Anderson SUBJECT: Problem Set 03 DUE: Wednesday, Sept. 10, 2008 1. A small can containing compressed air at a sufficiently high pressure can be used to reinflate a flat automobile tire. If the initial temperature of both the compressed air and the air in the tire is 70 ° F, estimate the initial pressure in the compressed air can necessary to reinflate one tire from 0 psig (14.7 psia) to 23 psig (37.7 psia). Also, estimate the final air temperature in the tire and in the can. For the purposes of this calculation you may assume: Air is an ideal gas with C P = 7 Btu/lb-mol- ° F. The tire does not change its size or shape during the inflation process. The inner tupbe of the tire has a volume of 1.5 ft 3 . The compressed air can has a volume of 0.022 ft 3 . The final pressure in the can is the same as that of the tire. 2. A gas line, often assumed to be at constant conditions of temperature and pressure, is used to fill gas cylinders/tanks.

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