Determine the electrical power supplied to a boiler when the temperature of the entering water is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is a negligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specific heat is c = 4,370 J/(Kg K). There is a 150W rate of heat loss from the boiler during this process to a surrounding at 293.2 k. Consider steady state conditions.Calculate the total rate of entropy production in

Refrigeration and Air Conditioning Technology (MindTap Course List)
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Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
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Chapter40: Typical Operating Conditions
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Determine the electrical power supplied to a boiler when the temperature of the entering water is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is a negligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specific heat is c = 4,370 J/(Kg K). There is a 150W rate of heat loss from the boiler during this process to a surrounding at 293.2 k. Consider steady state conditions.
Calculate the total rate of entropy production in

Expert Solution
Step 1

The inlet and exit temperature respectively are 20 degree Celsius and 89 degree Celsius. Also, the flow rate of pressured water is 2 kg/s. Consider Q as the heat energy, m as the mass, C as the specific heat, Tf as the exit temperature, and Ti as the inlet temperature. Also, consider P as the electrical power. Now, the rate of heat energy gives power. Thus, calculate the required electrical power.

о-тc (т, -т)
о-тс (т, -т.)
kg
2x 4370
P= 2
x(89 °C – 20 °C)
kg K
= 603060 W
Step 2

The pressure drop in the boiler is negligible. Calculate the rate of entropy when the flow raises heat in the boiler.

(T;
|- Rln
P,
(as), - тс, im
mC, In
For negligible pressure drop,
т,
(ds), = mC,In|
kg
89 + 273 K
In
20+ 273 K
-× 4370
= 2
kg K
= 1848.262
K.s
||
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