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Engineering and Tech / Fundamentals of Thermodynamcs 8 / Chapter 2 / Problem 156EUP

Fundamentals of Thermodynamcs | 8th Edition | ISBN: 9781118131992 | Authors: Claus Borgnakke, Richard E. Sonntag

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Chapter 2, Problem 156EUP

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QUESTION:

Problem 156EUP

A pressure cooker has the lid screwed on tight. A small opening with A = 0.0075 in.2 is covered with a petcock that can be lifted to let steam escape. How much mass should the petcock have to allow boiling at 250 F with an outside atmosphere of 15 psia?

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QUESTION:

Problem 156EUP

A pressure cooker has the lid screwed on tight. A small opening with A = 0.0075 in.2 is covered with a petcock that can be lifted to let steam escape. How much mass should the petcock have to allow boiling at 250 F with an outside atmosphere of 15 psia?

ANSWER:

Solution 156EUP

Step 1 of 3

Here we have to calculate the mass that petcock should have in order to allow upto $250\ F$ when the atmospheric pressure outside is 15 psia.

Given data,

Area, $A=0.0075\ {in}^{2}$

Temperature, ${T}_{\ }=250\ F$

Atmospheric pressure, ${P}_{atm}=15\ psia$

Acceleration due to gravity, $g=32.174\ {ft/s}^{2}$

To find,

Mass of petcock, $m=?$

For the given temperature ${T}_{\ }=250\ F$ , the saturation pressure will be ${P}_{sat}=29.823\ psia$ (Table 7.1)

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