Explanation Write the formula to calculate the rate of heat removal from the compressor air. Q ˙ c o o l i n g = ( P ) ( L ) ( C F ) (I) Here, power rating is P , load factor is L and after cooling factor is C F . Write the formula to calculate the amount of energy saved by cooling the compressed air before it enters into refrigerated dryer. E s a v i n g = ( Q ˙ c o o l i n g ) ( T ) C O P (II) Here, amount of energy saved is E s a v i n g , rate of heat removal is Q ˙ c o o l i n g , annual operating time is T and coefficient of performance is COP . Write the formula to calculate the amount of money saved by cooling the compressed air before it enters into refrigerated dryer. C s a v i n g = ( E s a v i n g ) ( C ) (III) Here, cost saving is C s a v i n g and unit cost of energy is C . Conclusion: Substitute 150 hp for P , 1.0 for L and 0.25 for C F in Equation (I). Q ˙ c o o l i n g = ( 150 hp ) ( ( 0.746 kW / hp ) ) ( 1.0 ) ( 0.25 ) = 27

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ISBN: 9780073398174

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

Publisher: McGraw-Hill Education

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Chapter 7.13, Problem 164P

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The amount of energy and money saved by cooling the compressed air before it enters into refrigerated dryer.

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Chapter 7.13, Problem 163P

Chapter 7.13, Problem 165P

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Chapter 7 Solutions

Thermodynamics: An Engineering Approach

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