Passage III
Heating degree-days (HDD) and cooling degree-days (CDD) are used to estimate the amount of energy needed to heat or cool, respectively, any building on a given day. HDD are calculated by subtracting the daily mean temperature (Td) from a base temperature of 65°F. Each degree difference is one HDD. CDD are calculated by subtracting 65°F from Td.
Table 1 lists, for each of 10 US cities, the latitude of the city and the city's total HDD and CDD for a 1 yr period.
For the state of Illinois, the annual total HDD and the annual total CDD were determined for each of the years 1985-2010 (see Figure 1).
17. Based on Table 1, for all the cities between 40°N and 50° N latitude, which of the following statements describing HDD or CDD is accurate? In a 1 yr period, the total:
Your Answer is
Correct Answer is A
Explanation
Analyze one by one according to the options from the fifth row to the ninth row of the table.