Civil Engineering Reference
In-Depth Information
c energy of the residence is necessary to present their
evolution in time for each month. The calculus starts from the speci
In the model for the speci
c annual
consumptions of heat and cold, and aims at
finding the speci
c monthly con-
sumption. The determination of the speci
c monthly consumption is done with
statistical indicators heating degree-day, HDD, and cooling degree-day, CDD.
Degree Day method determines monthly the heat and cold consumption, per unit of
total
floor area of the building with equation:
q
HDD
monthly
HDD
year
q
monthly
¼
ð
51
Þ
Respectively
q
C
CDD
monthly
CDD
year
q
C
monthly
¼
ð
52
Þ
c monthly consumption of electricity and domestic hot water (DHW)
is considered the same (constant) for each month, namely:
The speci
e
N
month
e
monthly
¼
ð
53
Þ
q
DHW
N
month
q
DHW monthly
¼
ð
54
Þ
where the number of months is N
month
¼
12.
Table 30 The monthly specific consumption (illustrative exercise)
Month
Heating
degrees
days
Cooling
degrees
days
Heat q
(kWh/m
2
)
Cold q
c
(kWh/m
2
)
DHW q
DHW
(kWh/m
2
)
Electricity e
(kWh/m
2
)
°
C-d
°
C-d
January
611
0
14.69
0.00
1.25
3.33
February
521
0
12.52
0.00
1.25
3.33
March
403
0
9.69
0.00
1.25
3.33
April
207
33
4.98
0.42
1.25
3.33
May
40
208
0.96
2.68
1.25
3.33
June
0
300
0.00
3.86
1.25
3.33
July
0
363
0.00
4.67
1.25
3.33
August
0
363
0.00
4.67
1.25
3.33
September
6
234
0.14
3.01
1.25
3.33
October
195
53
4.69
0.68
1.25
3.33
November
390
0
9.38
0.00
1.25
3.33
December
539
0
12.96
0.00
1.25
3.33
Annually
2,912
1,554
70.00
20.00
15.00
40.00
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