As shown in figure below, a closed, rigid tank is filled with Refrigerant 22, initially at -10°C, a quality of 75%, and a volume of 0.03 m³. Since the quality of initial mixture is 75%, there is 25% liquid in the tank. You are asked to convert all liquid into vapor using a 12-volt battery and fine-wire electric resistor. You deicide to pass 6-amp of current to the resistor for 15 minutes. After 15 minutes you measure the temperature of the final vapor to be 40°C. a. determine the amount of electric work used in this process, in kJ. b. assume that tank was not insulated from surroundings. How much energy was wasted to surroundings in the form of heat transfer, in kJ. c. find efficiency of your heating process, where efficiency is defined as the ratio of internal energy change of R22 divided by electric work. d. sketch the process on T-v diagram.

As shown in figure below, a closed, rigid tank is filled with Refrigerant 22, initially at -10°C, a quality of 75%, and a volume of 0.03 m³. Since the quality of initial mixture is 75%, there is 25% liquid in the tank. You are asked to convert all liquid into vapor using a 12-volt battery and fine-wire electric resistor. You deicide to pass 6-amp of current to the resistor for 15 minutes. After 15 minutes you measure the temperature of the final vapor to be 40°C. a. determine the amount of electric work used in this process, in kJ. b. assume that tank was not insulated from surroundings. How much energy was wasted to surroundings in the form of heat transfer, in kJ. c. find efficiency of your heating process, where efficiency is defined as the ratio of internal energy change of R22 divided by electric work. d. sketch the process on T-v diagram.

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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Question

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As shown in figure below, a closed, rigid tank is filled with Refrigerant 22,
initially at -10°C, a quality of 75%, and a volume of 0.03 m³. Since the quality of
initial mixture is 75%, there is 25% liquid in the tank. You are asked to convert all
liquid into vapor using a 12-volt battery and fine-wire electric resistor. You
deicide to pass 6-amp of current to the resistor for 15 minutes. After 15 minutes
you measure the temperature of the final vapor to be 40°C.
a. determine the amount of electric work used in this process, in kJ.
b. assume that tank was not insulated from surroundings. How much energy
was wasted to surroundings in the form of heat transfer, in kJ.
c. find efficiency of your heating process, where efficiency is defined as the
ratio of internal energy change of R22 divided by electric work.
d. sketch the process on T-v diagram.

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