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.

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## 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:**

- First, determine the total volume of air (m^3). In this example, the total volume of air (m^3) is measured to be 50.
- 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.
- 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)