Irreversibility Calculator

✖Temperature is the degree or intensity of heat present in a substance or object.ⓘ Temperature [T]			+10% -10%
✖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 2 [S₂]			+10% -10%
✖Entropy at point 1 is the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work.ⓘ Entropy at Point 1 [S₁]			+10% -10%
✖Heat input is the energy transferred to a thermodynamic system, by mechanisms other than thermodynamic work or transfer of matter.ⓘ Heat Input [Q_in]			+10% -10%
✖Input Temperature is the degree or intensity of heat present in the system.ⓘ Input Temperature [T_in]			+10% -10%
✖Heat output is the energy transferred from a thermodynamic system, by mechanisms other than thermodynamic work or transfer of matter.ⓘ Heat Output [Q_out]			+10% -10%
✖Output Temperature is the degree or intensity of heat present outside the system.ⓘ Output Temperature [T_out]			+10% -10%

✖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 [I₁₂]

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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)-Q_in/T_in+Q_out/T_out)
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: 298 Kelvin --> 298 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)-Q_in/T_in+Q_out/T_out) --> (298*(145-50)-200/210+300/120)

Evaluating ... ...

I₁₂ = 28311.5476190476

STEP 3: Convert Result to Output's Unit

28311.5476190476 Joule per Kilogram --> No Conversion Required

FINAL ANSWER

28311.5476190476 ≈ 28311.55 Joule per Kilogram <-- Irreversibility

(Calculation completed in 00.004 seconds)

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Created by Suman Ray Pramanik

Indian Institute of Technology (IIT), Kanpur

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< Entropy Generation Calculators

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Entropy Balance Equation

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Irreversibility Formula

Irreversibility = (Temperature*(Entropy at Point 2-Entropy at Point 1)-Heat Input/Input Temperature+Heat Output/Output Temperature)
I₁₂ = (T*(S₂-S₁)-Q_in/T_in+Q_out/T_out)

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 formula is defined as a measure of the degree to which a thermodynamic process deviates from reversibility, reflecting the generation of entropy due to irreversible processes in a system. 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 (Q_in), Input Temperature (T_in), Heat Output (Q_out) & Output Temperature (T_out) and hit the calculate button. Here is how the Irreversibility calculation can be explained with given input values -> 28311.55 = (298*(145-50)-200/210+300/120).

FAQ

What is Irreversibility?

Irreversibility formula is defined as a measure of the degree to which a thermodynamic process deviates from reversibility, reflecting the generation of entropy due to irreversible processes in a system and is represented as I₁₂ = (T*(S₂-S₁)-Q_in/T_in+Q_out/T_out) 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 formula is defined as a measure of the degree to which a thermodynamic process deviates from reversibility, reflecting the generation of entropy due to irreversible processes in a system 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 (Q_in), Input Temperature (T_in), Heat Output (Q_out) & Output Temperature (T_out). 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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