Well, the density of water is 1 kg/liter...
An OG of 1.102 means your original density is 1.102 kg/liter. You said it was 19 liters, so your mass is
( 1.102 kg/liter ) * (19 liters) = 20.94 kg
During fermentation, your mass is pretty much constant. So if the density decreases and the mass stays the same, then the volume must increase. So with an FG of 1.024, your density is 1.024 kg/liter. Then, your final volume is:
( 20.94 kg ) / (1.024 kg/liter) = 20.45 liters
Your increase in volume:
( 20.45 liters ) - ( 19 liters) = 1.45 liters
So, you should expect an increase of about 1.5 liters during fermentation of such a large beer.