1. What is Cooling Degree Days (CDD)?

Cooling Degree Days (CDD) is a measurement designed to quantify the demand for energy needed to cool buildings. It is derived from measurements of outside air temperature and gives an indication of how much (in degrees), and for how long (in days), the outside air temperature was above a specific base temperature.

2. How Does the Calculator Work?

The calculator uses the CDD equation:

Where:

• \( T_{avg} \) — Average daily temperature (°C)
• \( T_{base} \) — Base temperature (°C)

Explanation: The equation calculates how much and for how long the temperature was above the base temperature, which is typically 18°C or 65°F (can vary by region).

3. Importance of CDD Calculation

Details: CDD is used by energy companies to forecast energy needs, by economists to assess energy consumption impacts on the economy, and by climate scientists to track climate change impacts.

4. Using the Calculator

Tips: Enter the average temperature and base temperature in degrees Celsius. The calculator will compute the cooling degree days.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical base temperature?
A: The most common base temperature is 18°C (65°F), but this can vary depending on regional climate and building characteristics.

Q2: How is CDD used in energy forecasting?
A: Utilities use CDD to predict electricity demand for air conditioning and to plan energy generation and distribution.

Q3: What's the difference between CDD and HDD?
A: Cooling Degree Days (CDD) measure cooling needs when temperature is above the base, while Heating Degree Days (HDD) measure heating needs when temperature is below the base.

Q4: Can CDD be negative?
A: No, CDD is always zero or positive. If the average temperature is below the base temperature, CDD is zero.

Q5: How is CDD calculated for longer periods?
A: For monthly or annual CDD, daily CDD values are summed over the period.