Engineering

How to Calculate and Solve for Work of Evapouration | Enthalpy

Last Updated on May 27, 2022

The work of evapouration is illustrated by the image below.

To compute for work of evapouration, three essential parameters are needed and these parameters are Specific Volume of Dry Gas (vg), Specific Volume of Wet Steam (vf) and Pressure of Gas (P).

The formula for calculating work of evapouration:

WE = P(vg – Vf)

Where:

WE = Work of Evapouration
vg = Specific Volume of Dry Gas
vf = Specific Volume of Wet Steam
P = Pressure of Gas

Given an example;
Find the work of evapouration when the specific volume of dry gas is 30, the specific volume of wet steam is 0 and the pressure of gas is 10.

This implies that;

vg = Specific Volume of Dry Gas = 30
vf = Specific Volume of Wet Steam = 0
P = Pressure of Gas = 10

WE = P(vg – Vf)
WE = 10 x (30 – 0)
WE = 10 x 30
WE = 300

Therefore, the work of evapouration is 300J.

Calculating the Specific Volume of Dry Gas when the Work of Evapouration, the Specific Volume of Wet Steam and the Pressure of Gas is Given.

vg = WE / P + vf

Where:

vg = Specific Volume of Dry Gas
WE = Work of Evapouration
vf = Specific Volume of Wet Steam
P = Pressure of Gas

Given an example;
With work of evapouration as 40, the specific volume of wet steam as 0 and the pressure of gas as 10. Find the specific volume of dry gas?

This implies that;

WE = Work of Evapouration = 40
vf = Specific Volume of Wet Steam = 0
P = Pressure of Gas = 10

vg = WE / P + vf
vg = 40 / 10 + 0
vg = 4

Therefore, the specific volume of dry gas is 4.

Calculating the Pressure of Gas when the Work of Evapouration, the Specific Volume of Dry Gas and the Specific Volume of Wet Steam is Given.

P = WE / vg – vf

Where:

P = Pressure of Gas
WE = Work of Evapouration
vg = Specific Volume of Dry Gas
vf = Specific Volume of Wet Steam

Given an example;
Find the pressure of gas when the work of evapouration is 30, the specific volume of dry gas is 15 and the specific volume of wet steam is 0.

This implies that;

WE = Work of Evapouration = 30
vg = Specific Volume of Dry Gas = 15
vf = Specific Volume of Wet Steam = 0

P = WE / vg – vf
P = 30 / 15 – 0
P = 2

Therefore, the pressure of gas is 2.

Nickzom Calculator – The Calculator Encyclopedia is capable of calculating the work of evapouration.

To get the answer and workings of the work of evapouration using the Nickzom Calculator – The Calculator Encyclopedia. First, you need to obtain the app.

You can get this app via any of these means:

Web – https://www.nickzom.org/calculator-plus

To get access to the professional version via web, you need to register and subscribe to have utter access to all functionalities.
You can also try the demo version via https://www.nickzom.org/calculator

Android (Paid) – https://play.google.com/store/apps/details?id=org.nickzom.nickzomcalculator
Android (Free) – https://play.google.com/store/apps/details?id=com.nickzom.nickzomcalculator

Apple (Paid) – https://itunes.apple.com/us/app/nickzom-calculator/id1331162702?mt=8
Once, you have obtained the calculator encyclopedia app, proceed to the Calculator Map, then click on Materials and Metallurgical under Engineering.

Now, Click on Chemical Reaction Thermodynamics under Materials and Metallurgical

Now, Click on Enthalpy under Chemical Reaction Thermodynamics

Now, Click on Work of Evapouration under Enthalpy

The screenshot below displays the page or activity to enter your values, to get the answer for the work of evapouration according to the respective parameter which is the Specific Volume of Dry Gas (vg), Specific Volume of Wet Steam (vf) and Pressure of Gas (P).

Now, enter the values appropriately and accordingly for the parameters as required by the Specific Volume of Dry Gas (vg) is 30, Specific Volume of Wet Steam (vfis 0 and Pressure of Gas (P) is 10.

Finally, Click on Calculate

As you can see from the screenshot above, Nickzom Calculator– The Calculator Encyclopedia solves for the work of evapouration and presents the formula, workings and steps too.

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