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Expansion vessel

Calculates the size of an expansion vessel depending on the pressure in the system.

Expansion vessel with bellow

Input Result
System volume Vs=
Min temperature Tmin= ˚C
Max temperature Tmax= ˚C
Min operating pressure Pmin=
Max operating pressure Pmax=
Expansions volume Vex=
Spare volume Vr,min=
Opening pressure Pini=
Min opening pressure Pini, min=
Min nominal volume VN,bälg=

Expansion vessel with pump or compressor

Input Result
System volume Vs=
Min temperature Tmin= ˚C
Max temperature Tmax= ˚C
Utilization η=
Expansion volume Vex=
Spare volume Vr,min=
Min nominal volume VN,pump=

Filling pressure

Input Result
System volume Vs=
Nominal volume VN=
Spare volume Vr,min=
Filling temperature Tfill= ˚C
Min temperature Tmin= ˚C
Min operating pressure Pmin=
Filling pressure Pfill=

Explanations

Expansion vessel

An expansion vessel is designed to handle medium varying volume caused by temperature differences. Calculations are made ​​to handle clean water.

System Volume

Refers to the total volume of liquid in the system.

Min temperature

Is used to get the right density at the lowest temperature of the water in the system.

Max temperature

Used to have the right density at the highest temperature of the water in the system.

Min working pressure

Refers to the minimum operating pressure of the system.

Min working pressure

Refers to the maximum operating pressure of the system.

Expansion Volume

The volume system volume increases due to temperature differences.

Reserv volume

Reserv volume is a safety margin that you want on the vessel. Is the expansion volume under 15l estimates the reserve volume as 20% of the expansion volume. Is the expansion volume larger than 15l is my reserv volume to 0.5% of the system volume, but at least 3 liters.

Opening pressure

The pressure gets expansion tank to begin taking on water.

Min opening pressure

The minimum opening pressure as standard.

Min nominal size

The estimated minimum volume of the vessel.

Utilization

Defines the proportion of vessel used.

Filling Temperature

The temperature of water used to refill the system.

Filling pressure

The pressure on the media needed to replenish the system.

Formula

Expansion volume: Expansion volume
Nominal volume for bellows vessels: Nominal volume for bellows vessels
Nominal volume with pump vessel: Nominal volume with pump vessel
Opening pressure: Opening pressure
Min opening pressure: Min opening pressure
Filling pressure: Filling pressure