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ME 326Homework Assignment #4
Due:
21 Sept 2011
Topic: Ideal Gas and state models
Problem #1:
A rigid tank has a volume of 52.5 ft
3
and contains methane (CH
4
) gas at a
temperature of 50 °F and 2000 psia.
For these conditions, a) estimate the mass of
methane in the tank using the Ideal Gas Model, b) estimate the mass using generalized
compressibility, c) assuming the result for part b is correct, what is the
relative
error if the
Ideal Gas model were used to determine the mass in the tank?
Problem #2:
Air is contained in a rigid tank at a temperature of 0 °C.
Heat is added to
the system to that the specific internal energy of the air increases by 800 kJ/kg.
Modeling
the air as an Ideal Gas, determine the final temperature assuming a) constant specific heat
at 0 °C, b) constant specific heat at T
avg
, c) 3
rd
order polynomial expression for specific
heat from Table 3s, d) property values from Table 5s.
Problem #3:
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 Fall '07
 Schmidt

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