Suppose that we have two system to increase the air temperature from 17°C to 52°C and both of them operating at constant air pressure as shown in below figures. System 1: The air temperature is increased as a consequence of the stirring of a liquid surrounding the line carrying the air. T-17°C P=100 kPa Viscous Fluid T=17°C P=100 kPa System 1 System 2: The air temperature is increased by passing it through one side of a counter-flow heat exchanger. On the other side, steam condenses at a pressure of 100kPa from a saturated vapour to a saturated liquid. Saturated liquid water P=100 kPa 2 T=52°C P-100 kPa Saturated water vapour P=100 kPa System 2 2 T=52°C P=100 kPa Both systems operate under steady conditions and are sufficiently insulated to prevent significant heat transfer with the surroundings. For each of the two systems, calculate the rate of entropy production, in

Elements Of Electromagnetics
7th Edition
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Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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kJ/K per kg of air passing through the system by using
1- Constant Cp for air at 300K
2- Average Cp of air.
3- Variable Cp or (sº)
4- Compare between the results obtained from both system.
Transcribed Image Text:kJ/K per kg of air passing through the system by using 1- Constant Cp for air at 300K 2- Average Cp of air. 3- Variable Cp or (sº) 4- Compare between the results obtained from both system.
Q1-
Suppose that we have two system to increase the air temperature from 17°C to
52°C and both of them operating at constant air pressure as shown in below
figures.
System 1: The air temperature is increased as a consequence of the
stirring of a liquid surrounding the line carrying the air.
T=17°C
P=100 kPa
Viscous Fluid
T=17°C
P=100 kPa
System 1
System 2: The air temperature is increased by passing it through one
side of a counter-flow heat exchanger. On the other side, steam
condenses at a pressure of 100kPa from a saturated vapour to a
saturated liquid.
Saturated liquid water
P=100 kPa
2
T=52°C
P=100 kPa
Saturated water vapour
P=100 kPa
System 2
2
T=52°C
P=100 kPa
Both systems operate under steady conditions and are sufficiently
insulated to prevent significant heat transfer with the surroundings. For
each of the two systems, calculate the rate of entropy production, in
Transcribed Image Text:Q1- Suppose that we have two system to increase the air temperature from 17°C to 52°C and both of them operating at constant air pressure as shown in below figures. System 1: The air temperature is increased as a consequence of the stirring of a liquid surrounding the line carrying the air. T=17°C P=100 kPa Viscous Fluid T=17°C P=100 kPa System 1 System 2: The air temperature is increased by passing it through one side of a counter-flow heat exchanger. On the other side, steam condenses at a pressure of 100kPa from a saturated vapour to a saturated liquid. Saturated liquid water P=100 kPa 2 T=52°C P=100 kPa Saturated water vapour P=100 kPa System 2 2 T=52°C P=100 kPa Both systems operate under steady conditions and are sufficiently insulated to prevent significant heat transfer with the surroundings. For each of the two systems, calculate the rate of entropy production, in
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