The enthalpy at constant pressure heating or cooling is illustrated by the image below. To calculate enthalpy at constant pressure (heating or cooling), two essential parameters are needed and these parameters are Enthalpy at Point 1 (h1) and Enthalpy at Point 2 (h2).
The formula for calculating enthalpy at constant pressure:
Q = h2Â – h1
Where:
Q = Enthalpy at Constant Pressure
h1Â = Enthalpy at Point 1
h2Â = Enthalpy at Point 2
Given an example;
Find the enthalpy at constant pressure when the enthalpy at point 1 is 20 and the enthalpy at point 2 is 28.
This implies that;
h1 = Enthalpy at Point 1 = 20
h2 = Enthalpy at Point 2 = 28
Q = h2Â – h1
That is, Q = 28 – 20
Q = 8
Therefore, the enthalpy at constant pressure is 8 J/Kg.
Calculating the Enthalpy at Point 1 when the Enthalpy at Constant Pressure and the Enthalpy at Point 2 are Given
h1 = h2 – Q
Where:
h1Â = Enthalpy at Point 1
Q = Enthalpy at Constant Pressure
h2Â = Enthalpy at Point 2
Let’s solve an example;
Find the enthalpy at point 1 when the enthalpy at constant pressure is 12 and the enthalpy at point 2 is 32.
This implies that;
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Q = Enthalpy at Constant Pressure = 12
h2 = Enthalpy at Point 2 = 32
h1 = h2 – Q
Then, h1 = 32 – 12
h1 = 20
Therefore, the enthalpy at point 1 is 20 J/Kg.
Read more:Â How to Calculate and Solve for Work of Evapouration | Enthalpy
Calculatint the Enthalpy at Point 2 when the Enthalpy at Constant Pressure and the Enthalpy at Point 1 are Given
h2 = Q + h1
Where:
h2Â = Enthalpy at Point 2
Q = Enthalpy at Constant Pressure
h1 = Enthalpy at Point 1
Let’s solve an example;
Given that the enthalpy at point 1 is 12 and the enthalpy at constant pressure is 10. Find the Enthalpy at point 2?
This implies that;
Q = Enthalpy at Constant Pressure = 10
h1 = Enthalpy at Point 1 = 12
So, h2 = Q + h1
h2 = 10 + 12
h2 = 22
Therefore, the enthalpy at point 2 is 22J/Kg.
How to Calculate Enthalpy at Constant Pressure Heating or Cooling With Nickzom Calculator
Nickzom Calculator – The Calculator Encyclopedia is capable of calculating the enthalpy at constant pressure heating or cooling.
To get the answer and workings of the enthalpy at constant pressure heating or cooling 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
So, Click on Enthalpy under Chemical Reaction Thermodynamics
Now, Click on Enthalpy at Constant Pressure Heating or Cooling under Enthalpy
The screenshot below displays the page or activity to enter your values, to get the answer for the enthalpy at constant pressure heating or cooling according to the respective parameter which is the Enthalpy at Point 1 (h1) and Enthalpy at Point 2 (h2).
Now, enter the values appropriately and accordingly for the parameters as required by the Enthalpy at Point 1 (h1) is 20 and Enthalpy at Point 2 (h2) is 28.
Finally, Click on Calculate
As you can see from the screenshot above, Nickzom Calculator– The Calculator Encyclopedia can calculate the enthalpy at constant pressure heating or cooling and presents the formula, workings and steps too.
