Air occupies a 0.5-m' tank. It starts at a pressure of 5 bar and a temperature of 300 K. Energy flows into the tank via heat transfer until the temperature reaches 400 K. This happens at constant pressure, which is possible because there is a pressure-relief valve that lets air leave the tank to keep the pressure constant. Neglect kinetic and potential energy effects, and use the ideal gas model with constant specific heats evaluated at 350 K. Determine the mass of air that escapes, in kg. Determine the amount of energy transfer by heat, in kJ. a. b. Hint: use Ucv = mu; he= u + RT, and co+ R Cp.

Air occupies a 0.5-m' tank. It starts at a pressure of 5 bar and a temperature of 300 K. Energy flows into the tank via heat transfer until the temperature reaches 400 K. This happens at constant pressure, which is possible because there is a pressure-relief valve that lets air leave the tank to keep the pressure constant. Neglect kinetic and potential energy effects, and use the ideal gas model with constant specific heats evaluated at 350 K. Determine the mass of air that escapes, in kg. Determine the amount of energy transfer by heat, in kJ. a. b. Hint: use Ucv = mu; he= u + RT, and co+ R Cp.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

Basic Thermodynamic Processes

The word 'thermodynamics' can be divided into two words, 'thermo' and 'dynamics'. The word thermo deals with the heat and thermal phenomenon, whereas dynamics deals with forces or external agent that drives the heat flow or aids in the motion of heat.

Question

Air occupies a 0.5-m' tank. It starts at a pressure of 5 bar and a temperature of 300 K. Energy
flows into the tank via heat transfer until the temperature reaches 400 K. This happens at constant
pressure, which is possible because there is a pressure-relief valve that lets air leave the tank to keep
the pressure constant. Neglect kinetic and potential energy effects, and use the ideal gas model with
constant specific heats evaluated at 350 K.
4.
Determine the mass of air that escapes, in kg.
Determine the amount of energy transfer by heat, in kJ.
a.
b.
Hint: use Ucv = mu;
he u+ RT, and cv+ R= Cp.

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