Samson TRUCK MASTER 1700, Инструкция по эксплуатации, Страница: 16 / 36

DOC9091B |
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Truck Master 1700
Pump model Description Truck Master 1700
Heat input from technical specifications Q
in Pump
30 kW
Ambient temperature t
amb
28°C
Maximum Working Temperature of the water.
This is determined by you. The temperature
has influence on the pump performance
t
op
40°C
Temperature difference Δ
t
t
Op
- t
amb
= 12°C
Truck radiator effect based on 20 °C in
temperature difference
Q
out Truck 20
20 kW
Truck radiator effect based on 12 °C in
temperature difference
Q
out Truck 12
12/20*20 = 12 kW
Total cooling requirement from fan cooler Q
fan cooler
Q
in Pump
-Q
out Truck 12
= 30-12 = 18 kW
3.4 Water consumption
Summary
We need to find a fan cooler that can transfer 18 kW with a temperature difference on 12°C.
That is 1,5 kW/°C.
If we for example accept a higher temperature, for instance 48°C, we will have full cooling effect from the
truck on 20 kW and a cooling requirement on 10 kW. The fan cooler we need to find is thereby on 10/20 =
0,5 kW/°C and a big difference to the bigger model calculated above.
It is possible to design the liquid separator so that almost 100% of the water is separated from the air.
However, the air will be heated up and thereby it can content more water. Also, the relative humidity will go
up and end near 100%.
So, the air will flow into the pump with maybe 50% relative humidity at a low temperature and be
discharged at a higher temperature and humidity. Therefore, there will be an evaporation from the system.
Temp.
Vacuum
20°C 30°C 40°C 50°C 55°C
50% 12 17 34 60 100
70% 5 10 20 35 60
80% 4 7 13 24 39
Choose your water temperature
Water consumption Liters per hour
3.5 Dome valve system
The liquid ring pump can handle liquid and particles in the inlet but it is of course
recommendable to avoid this.
A dome valve or floating valve will ensure that the suction will be closed when the liquid
level reaches the top of the tank.
In many situations there will be foam on the liquid surface inside the tank. It can be
difficult to avoid that this will be transported into the suction line before the dome valve
will close.
Therefore, it will be recommended to make a combination of a filter and dome valve as
illustrated below.
The filter will prevent particles lifted by the foam to enter the pump.
DOC1627393