IVT C7 User Manual

Technical information
6 720 643 409 (2010/03)
26
7.3.5 Collector pressure loss
The collector's pressure loss depends on the
temperature and the mixing ration of antifreeze and
water. When the temperature falls and the share of
antifreeze increases, the pressure loss from the
collector rises.
Fig. 18
D Factor relative to pressure loss
K Concentration of antifreeze
Example:
If the concentration of antifreeze is 25 vol. % and the
temperature is 0 °C, the pressure loss with regard to the
water medium increases by a factor of 1.425.
7.3.6 Measurement values for temperature sensors
When calculating pressure loss, the
concentration of antifreeze (propylene
glycol) should be taken into consideration.
0102030
0 °C
-5 °C
K
40 50 60
1,0
1,1
1,2
1,3
1,4
1,5
1,6
1,7
1,8
1,9
2,0
D
6 720 612 299-40.1J
[Vol.-%]
°C Ω
T...
°C Ω
T...
°C Ω
T...
°C Ω
T...
–40 154300 –5 19770 30 3790 65 980
–35 111700 0 15280 35 3070 70 824
–30 81700 5 11900 40 2510 75 696
–25 60400 10 9330 45 2055 80 590
–20 45100 15 7370 50 1696 85 503
–15 33950 20 5870 55 1405 90 430
–10 25800 25 4700 60 1170
Tab. 17

IVT C7 Specifications

General

Brand	IVT
Model	C7
Category	Heat Pump
Language	English