The sizing of receivers is important as it has a direct impact on both the overall reliability and the energy efficiency of the compressed air system.
The size of an air receiver will depend on the amount of fluctuation in air demand. In most cases an adequately sized receiver will be able to supply the extra air during a high demand period and then recharge when the demand drops off. This function allows the air compressor to be sized for the average demand, rather than for the maximum demand. In some cases when the fluctuation is too great, a solution can be to have a smaller compressor that can ‘kick in’ as required.
There are a number of formulae for calculating the storage volume required. However, the following empirical rule can provide an approximation for planning purposes, taking into account the compressor(s) output and the pattern of demand.
The Air receiver should be sized (in Litres) to be at least 6 – 10 times the compressor free air output (in litres a second).