**Energy Savings by Cooling Food Before Refrigeration**It is commonly recommended that hot foods be cooled first to room temperature by simply waiting a while before they are put into the refrigerator to save energy. Despite this commonsense recommendation, a person keeps cooking a large pan of stew three times a week and putting the pan into the refrigerator while it is still hot, thinking that the money saved is probably too little. But he says he can be convinced if you can show that the money saved is significant.**Parameters:**- **Average mass of the pan and contents**: 5 kg- **Average temperature of the kitchen**: 23°C- **Average temperature of the food**: 95°C (when removed from the stove)- **Refrigerated space temperature**: 3°C- **Average specific heat of the food and pan**: 3.9 kJ/kg·°C- **Refrigerator coefficient of performance**: 1.5- **Electricity cost**: $0.135/kWh **Objective:**Determine how much this person will save a year by waiting for the food to cool to room temperature before putting it into the refrigerator.**Illustration:**The image shows a refrigerator with hot food at 95°C inside and the room temperature outside at 23°C. The inside of the fridge is maintained at 3°C.**Calculation:**To calculate potential savings, consider the energy required to cool food directly from 95°C to 3°C, versus cooling it from 23°C to 3°C, and multiply by the number of times this occurs per year.**Savings Calculation:**The amount of money saved per year is $ ______.

Answered: Image /qna-images/answer/683803d2-aa41-48c7-9246-8cde750df644.jpg

It is commonly recommended that hot foods be cooled first to room temperature by simply waiting a while before they are put into the refrigerator to save energy. Despite this commonsense recommendation, a person keeps cooking a large pan of stew three times a week and putting the pan into the refrigerator while it is still hot, thinking that the money saved is probably too little. But he says he can be convinced if you can show that the money saved is significant. The average mass of the pan and its contents is 5 kg. The average temperature of the kitchen is 23°C, and the average temperature of the food is 95°C when it is taken off the stove. The refrigerated space 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-°C. If the refrigerator has a coefficient of performance of 1.5 and the cost of electricity is $0.135/kWh, determine how much this person will save a year by waiting for the food to cool to room temperature before putting it into the refrigerator. 23°C Hot food 95°C 3°C The amount of money saved per year is $[

It is commonly recommended that hot foods be cooled first to room temperature by simply waiting a while before they are put into the refrigerator to save energy. Despite this commonsense recommendation, a person keeps cooking a large pan of stew three times a week and putting the pan into the refrigerator while it is still hot, thinking that the money saved is probably too little. But he says he can be convinced if you can show that the money saved is significant. The average mass of the pan and its contents is 5 kg. The average temperature of the kitchen is 23°C, and the average temperature of the food is 95°C when it is taken off the stove. The refrigerated space 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-°C. If the refrigerator has a coefficient of performance of 1.5 and the cost of electricity is $0.135/kWh, determine how much this person will save a year by waiting for the food to cool to room temperature before putting it into the refrigerator. 23°C Hot food 95°C 3°C The amount of money saved per year is $[

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Calorimetry

Measuring the heat transferred during chemical reactions or other physical processes is known as calorimetry. It comes under the branch of thermochemistry.

Question

**Energy Savings by Cooling Food Before Refrigeration**

It is commonly recommended that hot foods be cooled first to room temperature by simply waiting a while before they are put into the refrigerator to save energy. Despite this commonsense recommendation, a person keeps cooking a large pan of stew three times a week and putting the pan into the refrigerator while it is still hot, thinking that the money saved is probably too little. But he says he can be convinced if you can show that the money saved is significant.

**Parameters:**
- **Average mass of the pan and contents**: 5 kg
- **Average temperature of the kitchen**: 23°C
- **Average temperature of the food**: 95°C (when removed from the stove)
- **Refrigerated space temperature**: 3°C
- **Average specific heat of the food and pan**: 3.9 kJ/kg·°C
- **Refrigerator coefficient of performance**: 1.5
- **Electricity cost**: $0.135/kWh

**Objective:**
Determine how much this person will save a year by waiting for the food to cool to room temperature before putting it into the refrigerator.

**Illustration:**
The image shows a refrigerator with hot food at 95°C inside and the room temperature outside at 23°C. The inside of the fridge is maintained at 3°C.

**Calculation:**
To calculate potential savings, consider the energy required to cool food directly from 95°C to 3°C, versus cooling it from 23°C to 3°C, and multiply by the number of times this occurs per year.

**Savings Calculation:**
The amount of money saved per year is $ ______.

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