Cooling Degree Day. An indicator of space cooling demand. The cooling degree days for a single day equal the average of the highest hourly temperature and the lowest hourly temperature for the day minus 65 degrees Fahrenheit, if greater than or equal to zero.
Cooling Degree Day. Cooling Degree Day (CDD) is a form of degree day used to estimate energy requirements for space cooling (e.g., air conditioning, refrigeration). One cooling degree day is obtained for each degree that the daily average temperature is above the base of 65 degrees F. For example, if the daily high temperature is 84 degrees and the daily low is 60 degrees, the average temperature for that day is 72 degrees F. The daily CDD is 7. If the average temperature is less than or equal to 65 degrees, the daily CDD is zero.
Cooling Degree Day. Difference between the actual temperature, as determined by the average of the high and low daily temperatures, and 65 degrees F. For example, if the daily high temperature is 77 degrees and the daily low is 65 degrees, the actual temperature for that day would be 71 degrees. The CDD's for that day would be 6 (71-65). If the average temperature is less than or equal to 65 degrees, the CDD's for the day would be zero
Cooling Degree Day. CDDs are a way to measure how much cooling is required in some period of time. A large number of CDDs signifies that the building required a large amount of cooling. Zero CDDs signifies that the building did not require any cooling. In case you are interested, CDDs for each day are calculated as follows: CDD = (TMean -TBalance Point ) * Nday+ Where TMean is the average of the high and low temperature for a day, and Nday = 1, and CDD must always be positive. For Utility Bill Analysis, CDDs are calculated separately for each day and then summed together into billing periods.
The average temperature for a given day less the baseline of 65°F a. Average temp 75°F b. [75°F-65°F] = 10 CDD
Cooling degree day. See "Cooling Degree Days."
Cooling Degree Day. A unit measuring the severity of summer or cooling energy conditions. Using a reference temperature of 65° F, degree days are determined by the difference in the mean daily temperature and the reference temperature. For example, a day with 85° F mean temperature has 20 CDD (85-65=20). The annual Cooling Degree Days are the sum of the degree days over a calendar year.
Cooling Degree Day. useful in determining cooling energy requirements. Defined as (MT - 65)= CDD, where MT is Mean Temperature (F). If MT is less than 65 degrees F, CDD=0. MT= Mean (average) Temperature of the day.