How Do You Calculate Enthalpy with Ammonia's Dryness Fraction at -10C?

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SUMMARY

The calculation of enthalpy for Ammonia (R717) at a saturation temperature of -10°C with a dryness fraction (x) of 0.9 involves using the Ammonia properties table. The dryness fraction represents the ratio of the vapor mass to the total mass in a saturated two-phase system, indicating the quality of the refrigerant. Understanding this concept is crucial for accurate thermodynamic calculations in refrigeration applications.

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  • Understanding of thermodynamic properties of refrigerants
  • Familiarity with Ammonia (R717) properties table
  • Knowledge of saturation temperature and dryness fraction concepts
  • Basic principles of two-phase systems in thermodynamics
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  • Study the Ammonia (R717) properties table in detail
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Engineers, HVAC professionals, and students studying thermodynamics or refrigeration systems will benefit from this discussion, particularly those working with Ammonia as a refrigerant.

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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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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
 
Last edited:
rubberduckie said:
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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