Cooling Degree Hours Calculator

Formula

The formula to calculate the Cooling Degree Hours (CDH) is:

\[ CDH = (T - T_b) \times t \]

Where:

\( CDH \) is the cooling degree hours
\( T \) is the temperature in degrees Celsius
\( T_b \) is the base temperature in degrees Celsius
\( t \) is the time in hours

What are Cooling Degree Hours?

Cooling degree hours (CDH) are a measure used in the field of meteorology and HVAC (heating, ventilation, and air conditioning) to quantify the demand for energy needed to cool a building. CDH is calculated by taking the difference between the outdoor temperature and a base temperature (usually 18°C or 65°F) and multiplying it by the number of hours the temperature remains above the base temperature. This metric helps in understanding the cooling requirements and energy consumption for air conditioning systems over a specific period.

Example

Let's say the temperature (T) is 25°C, the base temperature (T_b) is 18°C, and the time (t) is 5 hours. Using the formula:

\[ CDH = (25 - 18) \times 5 = 35 \]

So, the cooling degree hours (CDH) is 35.