Freezing Degree Days (FDD) Calculator

Calculate Freezing Degree Days (FDD)



Formula

The formula to calculate the Freezing Degree Days (FDD) is:

\[ \text{FDD} = (T_{\text{avg}} - 32) \times D \]

Where:

Definition

Example

Let's say the average daily temperature (Tavg) is 20°F and the number of days (D) is 10. Using the formula:

\[ \text{FDD} = (20 - 32) \times 10 = -120 \]

So, the freezing degree days (FDD) is -120.

Extended information about "Freezing-Degree-Days-FDD-Calculator"

Freezing Degree Days Formula

Definition: Freezing degree days (FDD) are used to estimate the amount of freezing that occurs over a period of time.

Formula: \( \text{FDD} = \sum (\text{T}_{avg} - 32) \)

Example: \( \text{FDD} = (30 - 32) + (28 - 32) + (25 - 32) \)

Cooling Degree Days Formula

Definition: Cooling degree days (CDD) are used to estimate the energy demand for cooling buildings.

Formula: \( \text{CDD} = \sum (\text{T}_{avg} - 65) \)

Example: \( \text{CDD} = (70 - 65) + (75 - 65) + (80 - 65) \)