2. The capacities of refrigeration units are commonly given in "tons", which corresponds to how many tons of ice the unit can make in 24 hours. Assume we have a 3-ton unit (this is a standard size for a residential heat pump). We can calculate how many kW of cooling capacity this corresponds to: The latent heat of fusion of water is 334 kJ/kg. 3-tons = 6000 lb = 2730 kg ● (2730 kg)(334 kJ/kg) = 911,800 kJ/24 hours = 10.55 kW of cooling. Assume you have a Carnot refrigerator that has the cooling capacity noted above and operates between ambient at 20°C and a cold space at 0°C. Find the amount of electric power that is required by the refrigerator (kW). Find the cost of the electricity needed to run this system for one day, using the current Seattle City Light rate of $0.13/kW-hr. Also find COPR.
2. The capacities of refrigeration units are commonly given in "tons", which corresponds to how many tons of ice the unit can make in 24 hours. Assume we have a 3-ton unit (this is a standard size for a residential heat pump). We can calculate how many kW of cooling capacity this corresponds to: The latent heat of fusion of water is 334 kJ/kg. 3-tons = 6000 lb = 2730 kg ● (2730 kg)(334 kJ/kg) = 911,800 kJ/24 hours = 10.55 kW of cooling. Assume you have a Carnot refrigerator that has the cooling capacity noted above and operates between ambient at 20°C and a cold space at 0°C. Find the amount of electric power that is required by the refrigerator (kW). Find the cost of the electricity needed to run this system for one day, using the current Seattle City Light rate of $0.13/kW-hr. Also find COPR.
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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Transcribed Image Text:2. The capacities of refrigeration units are commonly given in "tons", which corresponds to
how many tons of ice the unit can make in 24 hours. Assume we have a 3-ton unit (this is a
standard size for a residential heat pump). We can calculate how many kW of cooling
capacity this corresponds to:
The latent heat of fusion of water is 334 kJ/kg.
● 3-tons = 6000 lb = 2730 kg
(2730 kg)(334 kJ/kg) = 911,800 kJ/24 hours = 10.55 kW of cooling.
●
Assume you have a Carnot refrigerator that has the cooling capacity noted above and
operates between ambient at 20°C and a cold space at 0°C. Find the amount of electric
power that is required by the refrigerator (kW). Find the cost of the electricity needed to run
this system for one day, using the current Seattle City Light rate of $0.13/kW-hr. Also find
COPR.
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