Page 6
Design
The dimensioning of an air/water heat pump should be
such that the bivalence point is between -3 and -10 °C.
This will help ensure that more than 90° of the annual
heating requirement is covered by the heat pump.
The maximum heating output of a building is determined
in the design, including its water consumption require-
ment.
In addition, the standard outside temperature is required.
This is determinated by geographical location and can be
obtained from various institutions.
Example:
Single-family house in Germany
4 persons
Service water consumption requirement:
•
4 x 0.25 kW = 1 kW
Heating output required:
•
16 kW
Standard outside temperature for Germany:
•
- 16 °C
Off-period factor:
•
1.1
Heating output required:
(service water consumption re heating output required) x off-period factor = 18.7 kW
0
5
10
15
20
25
30
35
40
45
-20
-15
-10
-5
0
5
10
15
20
W35 EN14511
CL 33
CL 27
CL 22
CL 15
CL 12
CL 10
CL 8
{
{
outside temperature [°C]
heating capacity [kW]
bivalence point of the
particular heatpump
type
standard external temperature
electr. additional heating
at TERRA CL 15
service water required
electr. additional heating
at TERRA CL 22
building- characteristic line
required heating capacity at
standard external temperature
incl. service water required
