Recent content by hazzz

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    2nd law of thermodynamics heat pump problem

    Homework Statement Here is the problem: An inventor claims to have developed a heat pump that provides a 180 kW heating effect for a 293 K household while only consuming 70 kW of power and using a heat source at 273 K. Can this claim be possible? Homework Equations COP of heat pump = Qh/W COP...
  2. H

    Thermodynamics pure substances problem

    OHHHH okay! I understand now! :D Thank you very much! You are the best!
  3. H

    Thermodynamics pure substances problem

    but where does the 1 come from? I thought the equation was X = mvapor/mtotal so if my X is equal to 0,004086 and my mtotal is 158,48kg how do they get 157,83kg ?
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    Thermodynamics pure substances problem

    I don't know :( In the solution book they wrote: mf = (1-xf) * mtotal where total = 158,48 kg but i don't know where they took 1-xf and what is xf
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    Thermodynamics pure substances problem

    Yes i got 158,48kg :) but what i am suppose to do after finding this value? Is this the total mass of water in the tank after or before the heating process ?
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    Thermodynamics pure substances problem

    yes everything is there, unless if you do not have access to the saturated water tables! :O For the critical state, the value of v is 0,003155m3/kg
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    Thermodynamics pure substances problem

    Homework Statement Hellooo, so this is the question that i have: A 0.5-m3 rigid tank initially contained a saturated liquid-vapor mixture of water at 140 °C is now heated until the mixture reaches the critical state. Determine the mass and the volume of liquid before the heating process...