Enter the airflow rate (CFM), the temperature difference between the air after recovery and the air before recovery (F), and the heat recovery efficiency (%) into the Heat Recovery Calculator. The calculator will evaluate the Heat Recovery.

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## Heat Recovery Formula

The following formula is used to calculate the Heat Recovery.

HR = 1.08 * Q * dT * E/100

Variables:

- HR is the Heat Recovery (BTU/h)
- Q is the airflow rate (CFM)
- dT is the temperature difference between the air after recovery and the air before recovery (F)
- E is the heat recovery efficiency (%)

## How to Calculate Heat Recovery?

The following steps outline how to calculate the Heat Recovery.

- First, determine the airflow rate (CFM).
- Next, determine the temperature difference between the air after recovery and the air before recovery (F).
- Next, determine the heat recovery efficiency (%).
- Next, gather the formula from above = HR = 1.08 * Q * dT * E/100.
- Finally, calculate the Heat Recovery.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem:**

Use the following variables as an example problem to test your knowledge.

airflow rate (CFM) = 100

temperature difference between the air after recovery and the air before recovery (F) = 30

heat recovery efficiency (%) = 50

HR = 1.08 * Q * dT * E/100 =** ** ?