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Thermodynamics of Nh3 absoption

  1. Mar 26, 2007 #1
    Hi all.

    For my teams senior design project we are designing an absorption cycle refrigerator that uses solar energy.

    We are using NH3 and H2O.

    I am having several problems with performing a thermodynamic analysis. I’m hoping someone can help me.


    NH3 boils at -33 C. How do I determine what temperature I need to get my H2O too, so that NH3 will be absorbed into the solution?


    How do I determine the temperature that the NH3 will boil out of solution? Is this an enthalpy problem?

    Do I need to add enough heat into the system to break NH4 (l) + OH(l) so that NH3(g) + H2O(l) will be produced?

    I know NH3 + H2O is an exothermic reaction and I've already calculated the heat given off.

    I'm just unsure how (or perhaps, why)the Nh3 gas would dissolve into the H2O. And obviously, I can't have my H2O less than -33 at atm pressure.

    This is a good place to start.

    I really appreciate anyone time who takes time to help out.

    Thank you.
  2. jcsd
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