Explanation Write the formula to calculate amount of electricity used to heat the water. Total energy used = total cost of energy unit cost of energy (I) Write the formula to calculate total energy ( E ˙ in ) transferred to water per week. E ˙ in = ( efficiency ) ( total energy used ) (II) Here, efficiency of machine is efficiency . Write the formula to calculate rate of heat removed from water ( Q ˙ L ) . E i n = m ˙ c p ( T o u t − T i n ) (III) Here, mass flow rate of water is m ˙ , specific heat at constant pressure is c p , outlet temperature of the water is T o u t , and inlet temperature of the water is T 2 . Write the volume ( V ˙ hot water ) of hot water used per week. V ˙ hot water = m ˙ ρ (IV) Here, density of water is ρ . Conclusion: Substitute $85 / year for total cost of energy , and $0 .113 / kWh for unit cost of energy in Equation (I). Total energy used = $85 / year $0 .113 / kWh = 752.21 kWh / year Substitute 91% for efficiency , and 752

8th Edition

ISBN: 9780073398174

Author: Yunus A. Cengel Dr., Michael A. Boles

Publisher: McGraw-Hill Education

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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 6.11, Problem 146RP

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The amount of hot water used by the family per week.

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Chapter 6.11, Problem 145RP

Chapter 6.11, Problem 147RP

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