Question: A 10- m3 storage tank contains methane at low temperature. The pressure inside is 700 kPa, and the tank contains 25% liquid and 75% vapor,

A 10- m3 storage tank contains methane at low temperature. The pressure inside is 700 kPa, and the tank contains 25% liquid and 75% vapor, on a volume basis. The tank warms very slowly because heat is transferred from the ambient.
a. What is the temperature of the methane when the pressure reaches 10 MPa?
b. Calculate the heat transferred in the process, using the generalized charts.
c. Repeat parts (a) and (b), using the methane tables, Table B.7. Discuss the differences in the results.

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