Explanation Write the expression of the electric power consumed by the air conditioning unit ( W ˙ in ) . W ˙ in = Q ˙ cooling COP (I) Here, coefficient of performance of air conditioning unit is COP and the rate of amount of cooling required for air conditioning unit is Q ˙ cooling . Write the expression of the rate of heat rejected at the cooling tower ( Q ˙ rejected ) . Q ˙ rejected = Q ˙ cooling + W ˙ in (II) Write the expression of the rate of amount of water that needs to evaporate to remove heat ( m ˙ water ) . m ˙ water = Q ˙ rejected h f g (III) Conclusion: Refer Table A-4, “Saturated water – Temperature table”, at a temperature of 30 ° C , obtain the enthalpy of vaporization of water ( h f g ) as 2 , 429.8 kJ / kg . Substitute 105 kW for Q ˙ cooling and 3 for COP in Equation (I). W ˙ in = 105 kW 3 = 35 kW Substitute 35 kW for W ˙ in and 105 kW for Q ˙ cooling in Equation (II)

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ISBN: 9780100257054

Author: CENGEL

Publisher: YUZU

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Chapter 14.7, Problem 117RP

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The amount of water that needs to evaporate to remove heat is reasonable or not.

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Chapter 14.7, Problem 116RP

Chapter 14.7, Problem 118RP

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Chapter 14 Solutions

EBK THERMODYNAMICS: AN ENGINEERING APPR

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