THE
ENERGY
FAMILY
(C) IDM ENERGIESYSTEME GMBH
3. General description
Installation instructions TERRA AL Twin
10
1
2
3
4
5
6
7
8
10
11
12
13
1
2
3
0
5
10
15
20
25
30
35
-20
-15
-10
-5
0
5
10
15
20
AL 17
W35 EN14511
{
outdoor temperature [°C]
heating capacity [kW]
bivalence point
standard externaltemperature
domestic hot water requirement
building- characteristic line
required heating capacity 14 kW
at standard external temperature
incl. service water required
Bivalence
AL 17 Twin
Dimensioning
Dim
ensio
ning
An air/water-heat pump should be dimensioned in
such a way that the bivalence point lies between -3
and -10 °C. This guarantees that more than 90° of
the annual heating requirement (Austria, Germany,
Switzerland) will be covered by the heat pump.
In dimensioning the system the maximum heating
output of the house including the water for domestic
use is calculated.
The standard outside temperature is additionally
required. This is determined by the geographical lo-
cation and can be found on the IDM homepage and
obtained from various institutions.
Example:
Detached single-family house in Germany
4 person-household
Domestic water requirements: 3x0.25 kW = 0.75 kW
Heating load requirement 11.0 kW
Standard external temperature
Germany:
- 16 °C
Off-period factor:
1.1
Heating energy required:
(domestic water requir heating load requirements) x off-period factor = 13.0 kW
3. Dimensioning
