It is commonly recommended that hot foods be cooled first to room temperature by simply waiting a while befor they are put into the refrigerator to save energy. Despite this common sense recommendation, a person keeps cookin a large pan of stew twice a week and putting the pan into the refrigerator while it is still hot, thinking that the mone saved is probably too little. The average mass of the pan and its contents is 5-kg. The average temperature of th kitchen is 20°C, and the average temperature of the food is 95°C when it is taken off the stove. The refrigerated spac is maintained at 3°C, and the average specific heat of the food and the pan can be taken to be 3.9 kJ/kg-K. If th refrigerator has a coefficient of performance of 1.2 and the cost of electricity is Php 21.59 per kW-hr. Determine ho much will be saved a year by waiting for the food to cool to room temperature before putting it into the refrigerator. Ans: Php 170.66 20°C
It is commonly recommended that hot foods be cooled first to room temperature by simply waiting a while befor they are put into the refrigerator to save energy. Despite this common sense recommendation, a person keeps cookin a large pan of stew twice a week and putting the pan into the refrigerator while it is still hot, thinking that the mone saved is probably too little. The average mass of the pan and its contents is 5-kg. The average temperature of th kitchen is 20°C, and the average temperature of the food is 95°C when it is taken off the stove. The refrigerated spac is maintained at 3°C, and the average specific heat of the food and the pan can be taken to be 3.9 kJ/kg-K. If th refrigerator has a coefficient of performance of 1.2 and the cost of electricity is Php 21.59 per kW-hr. Determine ho much will be saved a year by waiting for the food to cool to room temperature before putting it into the refrigerator. Ans: Php 170.66 20°C
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter1: Basic Modes Of Heat Transfer
Section: Chapter Questions
Problem 1.82P: Discuss the modes of heat transfer that determine the equilibrium temperature of the space shuttle...
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