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This sizing tool will give good results for most systems.
Some assumptions are made about the configuration of the system;These are as follows:
  • The expansion vessel is connected near the cold water inlet (or on the boiler return in the case of a central heating system).
  • The water supply is pressure regulated to a certain maximum cold operating pressure.
  • The precharge pressure in the expansion vessel should be 0.2 bar lower than the cold operating pressure to ensure proper functioning. Otherwise pressure fluctuation and water hammer effects can occur.
  • The ambient air pressure is 1.0 bar

This calculation can also be used for heating installations with a temperature <90 °C. In this case, replace the tank volume with the volume of water in the heating system.
This program selects vessel from the following sizes stocked by RVR.ie:
liters

Operating parameters
Cold operating pressure: bar
Expansion Vessel precharge : bar
Max pressure in vessel (Safety valve pressure): bar
DHW tank properties
Hot water tank capacity: liters
Max temperature in DHW (hot water): °C
Water supply temperature (cold water): °C
Expansion Vessel
Select size: or input the size: liters
Results

Just move off the field with Enter or Tab or use Refresh to recalcualte!

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