A) the total number of degree-days using 65 degrees F as the reference value. B)
ID: 3149419 • Letter: A
Question
A) the total number of degree-days using 65 degrees F as the reference value. B) the total requirement for a 3000square foot house (9 ft. ceilings) in BTUs for the 14 days assuming 1 BTU per cubic foot per degree-dayFor part A, the book defines a degree-day as a day during which the average outside temperature is one degree less than the desired inside temperature. If my calculations are right, there aren't any degree-days because the averages don't reach the needed 64 degrees to be considered a degree day. Maybe I'm doing something wrong. Table 1 Day Daily Maximum Daily Minimum IOF 34.0 42.0 44.0 70.0 47.0 28.0 52.0 66.0 66.0 72.0 73.0 53.0 51.0 66.0 28.0 33.0 30.0 43.0 28.0 23.0 18.0 39.0 43.0 42.0 51.0 39.0 36.0 49.0 4 10 12 13 14
Explanation / Answer
A) Calculating Heating Degee-Day (HDD): Take the average temperature on any given day, and subtract it from the base temperature. If the value is less than or equal to zero, that day has zero HDD. But if the value is positive, that number represents the number of HDD on that day.
[That is, Degree-Day is a unit used to determine the heating requirements of buildings, representing a fall of one degree below a specified average outdoor temperature (usually 18°C or 65°F) for one day.]
S.No
Max
Min
total
Avg (X)
HDD=65-X
1
34
28
62
31
34
2
42
33
75
37.5
27.5
3
44
30
74
37
28
4
70
43
113
56.5
8.5
5
47
28
75
37.5
27.5
6
28
23
51
25.5
39.5
7
52
18
70
35
30
8
66
39
105
52.5
12.5
9
66
43
109
54.5
10.5
10
72
42
114
57
8
11
73
51
124
62
3
12
53
39
92
46
19
13
51
36
87
43.5
21.5
14
66
49
115
57.5
7.5
Total
277
A) The total number of degree-days using 65 degrees F as the reference value = 277
B) the total requirement for a 3000square foot house (9 ft. ceilings) in BTUs for the 14 days (assuming 1 BTU per cubic foot per degree-day) = 3000X277 =83100 BTU
S.No
Max
Min
total
Avg (X)
HDD=65-X
1
34
28
62
31
34
2
42
33
75
37.5
27.5
3
44
30
74
37
28
4
70
43
113
56.5
8.5
5
47
28
75
37.5
27.5
6
28
23
51
25.5
39.5
7
52
18
70
35
30
8
66
39
105
52.5
12.5
9
66
43
109
54.5
10.5
10
72
42
114
57
8
11
73
51
124
62
3
12
53
39
92
46
19
13
51
36
87
43.5
21.5
14
66
49
115
57.5
7.5
Total
277
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