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3.1.6 Protection against vacuum with HORNIT systems
These steps only apply to the HORNIT systems. These systems operate at a pressure between 800 mbar and
1000mbar, the overpressure can only be regulated by using an electrical valve.
Step 1. When the total system pressure in the heat storage tank is at the desired level, the nitrogen generator stops.
Under the influence of heat, the water expands and the total system pressure increases. When the pressure of
the nitrogen blanket is at its maximum working pressure, the nitrogen generator will activate a solenoid valve.
The nitrogen is vented from the buffer tank until the desired nominal pressure is reached.
Step 2. If water in the buffer tank is not further heated up and cools down then the total system pressure also drops. It is
possible that the pressure drops below 0 Bar and turns into a vacuum. The vacuum safety valve will open and
will let surrounding air into the tank. This will undo the vacuum.
Summary of Contents for HORNIT N2
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