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Dryness Fraction question

by rubberduckie
Tags: dryness, fraction
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rubberduckie
#1
Jun3-08, 07:53 AM
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With the use of Ammonia (R717) properties table, find the enthalpy of the refrigerant if the saturation temperature is -10C and the dryness fraction, x, is 0.9.

can anyone help me with this? i do not understand the use of dryness fraction
Many thanks!
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Astronuc
#2
Jun3-08, 04:57 PM
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Check one's text, but if 'dryness' is like steam quality, then it refers to the fraction of a saturated two phase system which is gas (vapor), as opposed to the other fraction which is liquid.

I assume dryness does not refer to the water content, which would lead to ammonium hydroxide, or 'aqua' ammonia.

This might be of interest - http://www.tannerind.com/anhydrous-ammonia.html

http://www.iifiir.org/en/doc/1055.pdf
stewartcs
#3
Jun3-08, 05:17 PM
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Quote Quote by rubberduckie View Post
With the use of Ammonia (R717) properties table, find the enthalpy of the refrigerant if the saturation temperature is -10C and the dryness fraction, x, is 0.9.

can anyone help me with this? i do not understand the use of dryness fraction
Many thanks!
The dryness fraction is just another term in thermodynamics for quality. It's equal to the mass of the vapor phase of the substance divided by the total mass of the substance.

Hope that helps.

CS


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