Enter the total volume of air (m^3) and the change in temperature of the air (C) into the calculator to determine the HVAC Energy. 

HVAC Energy Formula

The following equation is used to calculate the HVAC Energy. 

E = V*d*Cp*T

Variables:

  • Where E is the HVAC Energy (Joules)
  • V is the total volume of air (m^3) 
  • T is the change in temperature of the air (C) 
  • d is the density of air (1.225 kg/m^3)
  • Cp is the specific heat of air (1000 J/kg-C)

How to Calculate HVAC Energy?

The following two example problems outline the steps and information needed in order to calculate the HVAC Energy.

Example Problem #1:

  1. First, determine the total volume of air (m^3). In this example, the total volume of air (m^3) is measured to be 50.
  2. Next, determine the change in temperature of the air (C). For this problem, the change in temperature of the air (C) is calculated to be 12.
  3. Finally, calculate the HVAC Energy using the formula above: 

E = V*d*Cp*T

Inserting the values from above and solving the equation with the imputed values gives: 

E = 50*1.225*1000*12 = 735,000 (Joules)


Example Problem #2: 

Using the same process as example problem 1, we first define the needed variables outlined by the formula. In this case, the values are provide as: 

total volume of air (m^3) = 104

change in temperature of the air (C) = 24

Entering these values into the formula or calculator above gives us: 

E = 104*1.225*1000*24 = 3057600(Joules)