Explanation Write the formula to calculate the amount of hot food refrigerate per year. m food = [ ( average mass of the pan ) × ( a person cooking a large pan of stew three times a week ) ] (I) Write the formula to calculate the amount of energy removed from food. Q out = m food c ( T 2 − T 1 ) (II) Here, specific heat of food is c , average temperature of food is T 2 and average temperature of kitchen is T 1 . Write the formula to calculate the amount of energy save by refrigerator in a year. E s a v e d = Q out COP (III) Here, performance of the refrigerator can be defined as the desired effect to work input is COP . Write the formula to calculate the money saved by the refrigerator in a year. Money saved = ( E saved ) × ( Q out ) (IV) Conclusion: Substitute 5 kg / pan for average mass of the pan and 3 pans / week for a person cooking a large pan of stew three times a week in Equation (I). m food = ( 5 kg / pan ) × ( 3 pans / week ) = ( 15 kg / week ) × ( 52 weeks / year ) = 780 kg / year Substitute 780 kg / year for m food , 3.90 kJ / kg ⋅ °C for c , 95 ° C for T 2 and 23 ° C for T 1 in Equation (II)

8th Edition

ISBN: 9780073398174

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

Publisher: McGraw-Hill Education

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Chapter 6.11, Problem 117P

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The amount of money this person will save a year by cooling the hot foods to room temperature before refrigerating them.

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Chapter 6.11, Problem 116P

Chapter 6.11, Problem 118P

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Thermodynamics: An Engineering Approach

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