| The reservoir must also include vapour space in addition to the fluid space. As the temperature rises the fluid expands. The space filled with vapour becomes smaller. At a given moment there will only be fluid left in the reservoir. After this, only a minor temperature increase is required to generate very high pressures in the reservoir as the fluid can no longer expand because there is no more space. The resulting forces are great enough to burst the reservoir. In order to ensure a reservoir is not over-filled, the pressure gas regulations stipulate how many kilos of refrigerant may be filled per litre of inside volume of the reservoir. This „filling factor“ multiplied by the inside volume indicates the authorised filling content. For the refrigerant R134a, it is 1.15°kg/l. |
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