Question
Asked Sep 17, 2019
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A closed, rigid, 0.55 m3 tank is filled with 9 kg of water.  The initial pressure is p1 = 20 bar.  The water is cooled until the pressure is p2 = 4 bar.  

Determine the initial quality, x1, and the heat transfer, in kJ.

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Expert Answer

Step 1

The following data have been given to us.

The volume of the tank, V = 0.55 m3.

The initial pressure of water, p1 = 20 bar.

The final pressure of water, p2 = 4 bar.

Mass of the water = 9 kg.

Step 2

Calculate the initial specific volume of water.

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V т 0.55 m3 9 kg =0.06111 m°/kg

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Step 3

The formulas for the specific volume and specific enthalpy &nbs...

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(1) Here, vspecific volume of saturated liquid at 20 bar vg1 = specific volume of saturated vapor at 20 bar = inlet quality (2) Here, vspecific volume of saturated liquid at 4 bar v2=specific volume of saturated vapor at 4 bar x2 final quality (3) Here, hspecific enthalpy of saturated liquid at 20 bar h21 specific enthalpy of saturated vapor at 20 bar (4) Here, hspecific enthalpy of saturated liquid at 4 bar ho2specific enthalpy of saturated vapor at 4 bar

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