What do heating and cooling degree-days measure?a) The number of hours a heating system operatesb) The temperature difference between day and nightc) The average number of degrees above or below a base temperatured) The total temperature range in a year
Question
What do heating and cooling degree-days measure?a) The number of hours a heating system operatesb) The temperature difference between day and nightc) The average number of degrees above or below a base temperatured) The total temperature range in a year
Solution
Heating and cooling degree-days measure c) The average number of degrees above or below a base temperature.
Here's a step-by-step explanation:
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Degree days are a measure of how cold or warm a location is. A degree day compares the mean (average) of the high and low temperatures recorded each day with a 65 degrees Fahrenheit base.
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If the average temperature for a day is above 65 degrees, we have cooling degree days. If it's below 65 degrees, we have heating degree days.
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For example, if the average temperature for a day was 60 degrees, there would be 5 heating degree days. If the average temperature was 70 degrees, there would be 5 cooling degree days.
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The heating degree days are a measure of how much (in degrees), and for how long (in days), outside air temperature was lower than a specific "base temperature" (or "balance point").
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Similarly, cooling degree days are a measure of how much (in degrees), and for how long (in days), outside air temperature was higher than a specific base temperature.
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They are used in calculations relating to the energy consumption required to heat or cool buildings.
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