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a. Consider that a cooking pan containing food with an average temperature of 95°C is placed into the refrigerator everyday. The average mass and specific heat of the pan with the food inside is 5 kg and 3.9 kJ/kg °C. Calculate the amount of saving in a year if the pan is put into the refrigerator after cooling to room temperature. b. if the door is opened 10 times everyday? Assume that at each opening of the refrigerator, all of What is the annual cost of energy waste arising from opening the refrigerator door the cold air in the refrigerator is replaced by the air in the kitchen.

a. Consider that a cooking pan containing food with an average temperature of 95°C is placed into the refrigerator everyday. The average mass and specific heat of the pan with the food inside is 5 kg and 3.9 kJ/kg °C. Calculate the amount of saving in a year if the pan is put into the refrigerator after cooling to room temperature. b. if the door is opened 10 times everyday? Assume that at each opening of the refrigerator, all of What is the annual cost of energy waste arising from opening the refrigerator door the cold air in the refrigerator is replaced by the air in the kitchen.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Q1. (Reading: Çengel and Boles, Thermodynamics: An Engineering Approach, 8th Ed., Pages 307-311) The amount of energy waste by a refrigerator increases by a number of malpractices. For example; opening the refrigerator door frequently will increase energy waste as the warmer air outside replaces the cool air inside. It is also not recommended to place the hot foods into the refrigerator before cooling them to the room temperature. Imagine a typical household refrigerator with an internal temperature of 4 °C. The refrigerator has a coefficient of performance of 1.4. The internal dimensions of this refrigerator are 186 cm (height) x 84 cm (width) x 75 cm (depth). The half of the refrigerator volume is used for storing food items. The air filling the other half of the refrigator volume contains 0.004 kg moisture/kg air on average. While the moisture content of the air in the kitchen is 0.01 kg/kg air, the temperature and pressure in the kitchen are 23°C and 97 kPa, respectively. Assuming that the cost of electricity is 0,4 TL/kWh, determine the followings: а. Consider that a cooking pan containing food with an average temperature of 95°C is placed into the refrigerator everyday. The average mass and specific heat of the pan with the food inside is 5 kg and 3.9 kJ/kg °C. Calculate the amount of saving in a year if the into the refrigerator after cooling to room temperature. pan is put b. What is the annual cost of energy waste arising from opening the refrigerator door if the door is opened 10 times everyday? Assume that at each opening of the refrigerator, all of the cold air in the refrigerator is replaced by the air in the kitchen.
Transcribed Image Text:Q1. (Reading: Çengel and Boles, Thermodynamics: An Engineering Approach, 8th Ed., Pages 307-311) The amount of energy waste by a refrigerator increases by a number of malpractices. For example; opening the refrigerator door frequently will increase energy waste as the warmer air outside replaces the cool air inside. It is also not recommended to place the hot foods into the refrigerator before cooling them to the room temperature. Imagine a typical household refrigerator with an internal temperature of 4 °C. The refrigerator has a coefficient of performance of 1.4. The internal dimensions of this refrigerator are 186 cm (height) x 84 cm (width) x 75 cm (depth). The half of the refrigerator volume is used for storing food items. The air filling the other half of the refrigator volume contains 0.004 kg moisture/kg air on average. While the moisture content of the air in the kitchen is 0.01 kg/kg air, the temperature and pressure in the kitchen are 23°C and 97 kPa, respectively. Assuming that the cost of electricity is 0,4 TL/kWh, determine the followings: а. Consider that a cooking pan containing food with an average temperature of 95°C is placed into the refrigerator everyday. The average mass and specific heat of the pan with the food inside is 5 kg and 3.9 kJ/kg °C. Calculate the amount of saving in a year if the into the refrigerator after cooling to room temperature. pan is put b. What is the annual cost of energy waste arising from opening the refrigerator door if the door is opened 10 times everyday? Assume that at each opening of the refrigerator, all of the cold air in the refrigerator is replaced by the air in the kitchen.
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