Explanation Write the energy rate balance equation for a control volume. E ˙ in − E ˙ out = d E ˙ system / d t = 0 ( For steady state ) Here, total energy rate at inlet is E ˙ in , the total energy rate at outlet is E ˙ out and change in net energy rate is d E ˙ system / d t . Rewrite the energy balance Equation for sealed electronic system. E ˙ in = E ˙ out Q ˙ in + m ˙ h 1 = m ˙ h 2 Q ˙ in = m ˙ c p ( T 2 − T 1 ) Q ˙ in = m ˙ c p Δ T (I) Here, specific enthalpy of water at state 1 is h 1 , specific enthalpy of water at state 2 is h 2 , rate of heat transfer to the cooling water is Q ˙ in , mass flow rate of tap water flowing through the electronic box is m ˙ , specific heat constant of water at room temperature is c p , temperature of water at inlet is T 1 , temperature of water at exit is T 2 , and net difference in inlet and outlet temperature of water is Δ T . Write the formula to calculate the amount ( m ) of cooling water used per year. m = m ˙ Δ t (II) Here, net time required is Δ t . Conclusion: Refer Table A-3, “Properties of common liquids, solids and foods”, obtain the constant pressure specific heat ( c p ) of water as 4 .18 kJ / kg ⋅ ° C

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ISBN: 9780100257054

Author: CENGEL

Publisher: YUZU

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Applied Fluid Mechanics

A fluid is a substance that is continuously deformed by the application of shear stress. The rate of deformation of a fluid depends on its viscosity. The fluid tries to flow when it interacts with some other system.

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Chapter 5.5, Problem 94P

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The mass flow rate of tap water flowing through the electronic box and the amount of cooling water used per year.

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Chapter 5.5, Problem 93P

Chapter 5.5, Problem 95P

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