Panasonic WH-UD07FE5 - Hydraulic Balancing; Special Behaviour When Cooling

101
Aquarea air / water heat pump – design handbook 07 / 2014
Project Design
Hydraulics
Hydraulic balancing | Peculiarities when cooling
Pump characteristic curve of the high-efciency water circulation pump without differen-
tial pressure control for the Aquarea heat pump units of the F generation or later
Pump delivery head of
high-efciency pumps
without differential
pressure control
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
Circulation rate [l
/ min]
Pump operating head [kPa]
010
7
6
5
4
3
2
1
20 30 40 6050
Min.
Max.
The hydraulic balancing of the heat transfer system is achieved from
correct setting of the circulation rates from regulating valves. In this
manner, a situation where individual building areas are excessively
heated up whereas other sections remain cold with low circulation rates
is avoided. The hydraulic balancing is therefore a question of home
comfort and at the same time also a prerequisite for efcient operation
of air / water heat pump.
Hydraulically, a heat pump system with cooling does not differ from a
pure heating system. For the calculation of seasonal performance factor,
both the heat produced and heat removed via cooling should be meas-
ured with a meter.
5.13.4 Hydraulic balancing
5.13.5 Special behaviour
when cooling