Irreversibility Solution

STEP 0: Pre-Calculation Summary
Formula Used
Irreversibility = (Temperature*(Entropy at point 2-Entropy at point 1)-Heat input/Input Temperature+Heat output/Output Temperature)
I12 = (T*(S2-S1)-Qin/Tin+Qout/Tout)
This formula uses 8 Variables
Variables Used
Irreversibility - (Measured in Joule per Kilogram) - Irreversibility of a process can also be construed as the amount of work to be done to restore the system to the original state.
Temperature - (Measured in Kelvin) - Temperature is the degree or intensity of heat present in a substance or object.
Entropy at point 2 - (Measured in Joule per Kilogram K) - Entropy at point 2 is the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work.
Entropy at point 1 - (Measured in Joule per Kilogram K) - Entropy at point 1 is the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work.
Heat input - (Measured in Joule per Kilogram) - Heat input is the energy transferred to a thermodynamic system, by mechanisms other than thermodynamic work or transfer of matter.
Input Temperature - (Measured in Kelvin) - Input Temperature is the degree or intensity of heat present in the system.
Heat output - (Measured in Joule per Kilogram) - Heat output is the energy transferred from a thermodynamic system, by mechanisms other than thermodynamic work or transfer of matter.
Output Temperature - (Measured in Kelvin) - Output Temperature is the degree or intensity of heat present outside the system.
STEP 1: Convert Input(s) to Base Unit
Temperature: 86 Kelvin --> 86 Kelvin No Conversion Required
Entropy at point 2: 145 Joule per Kilogram K --> 145 Joule per Kilogram K No Conversion Required
Entropy at point 1: 50 Joule per Kilogram K --> 50 Joule per Kilogram K No Conversion Required
Heat input: 200 Joule per Kilogram --> 200 Joule per Kilogram No Conversion Required
Input Temperature: 210 Kelvin --> 210 Kelvin No Conversion Required
Heat output: 300 Joule per Kilogram --> 300 Joule per Kilogram No Conversion Required
Output Temperature: 120 Kelvin --> 120 Kelvin No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
I12 = (T*(S2-S1)-Qin/Tin+Qout/Tout) --> (86*(145-50)-200/210+300/120)
Evaluating ... ...
I12 = 8171.54761904762
STEP 3: Convert Result to Output's Unit
8171.54761904762 Joule per Kilogram --> No Conversion Required
FINAL ANSWER
8171.54761904762 8171.548 Joule per Kilogram <-- Irreversibility
(Calculation completed in 00.004 seconds)

Credits

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Created by Suman Ray Pramanik
Indian Institute of Technology (IIT), Kanpur
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Irreversibility Formula

​LaTeX ​Go
Irreversibility = (Temperature*(Entropy at point 2-Entropy at point 1)-Heat input/Input Temperature+Heat output/Output Temperature)
I12 = (T*(S2-S1)-Qin/Tin+Qout/Tout)

What is Irreversibility of a process?

Irreversibility of a process can also be construed as the amount of work to be done to restore the system to the original state. It implies that the amount of heat energy to be supplied in a real process is larger than the thermodynamic limit. If the value of irreversibility is zero that means the process is reversible. If the value is greater than 1, then the process is irreversible.

How to Calculate Irreversibility?

Irreversibility calculator uses Irreversibility = (Temperature*(Entropy at point 2-Entropy at point 1)-Heat input/Input Temperature+Heat output/Output Temperature) to calculate the Irreversibility, Irreversibility of a process can also be construed as the amount of work to be done to restore the system to the original state. Irreversibility is denoted by I12 symbol.

How to calculate Irreversibility using this online calculator? To use this online calculator for Irreversibility, enter Temperature (T), Entropy at point 2 (S2), Entropy at point 1 (S1), Heat input (Qin), Input Temperature (Tin), Heat output (Qout) & Output Temperature (Tout) and hit the calculate button. Here is how the Irreversibility calculation can be explained with given input values -> 8171.548 = (86*(145-50)-200/210+300/120).

FAQ

What is Irreversibility?
Irreversibility of a process can also be construed as the amount of work to be done to restore the system to the original state and is represented as I12 = (T*(S2-S1)-Qin/Tin+Qout/Tout) or Irreversibility = (Temperature*(Entropy at point 2-Entropy at point 1)-Heat input/Input Temperature+Heat output/Output Temperature). Temperature is the degree or intensity of heat present in a substance or object, Entropy at point 2 is the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work, Entropy at point 1 is the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work, Heat input is the energy transferred to a thermodynamic system, by mechanisms other than thermodynamic work or transfer of matter, Input Temperature is the degree or intensity of heat present in the system, Heat output is the energy transferred from a thermodynamic system, by mechanisms other than thermodynamic work or transfer of matter & Output Temperature is the degree or intensity of heat present outside the system.
How to calculate Irreversibility?
Irreversibility of a process can also be construed as the amount of work to be done to restore the system to the original state is calculated using Irreversibility = (Temperature*(Entropy at point 2-Entropy at point 1)-Heat input/Input Temperature+Heat output/Output Temperature). To calculate Irreversibility, you need Temperature (T), Entropy at point 2 (S2), Entropy at point 1 (S1), Heat input (Qin), Input Temperature (Tin), Heat output (Qout) & Output Temperature (Tout). With our tool, you need to enter the respective value for Temperature, Entropy at point 2, Entropy at point 1, Heat input, Input Temperature, Heat output & Output Temperature and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.
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