A new method and device for trub separation is described. The operating principle is the exploitation of the convection currents naturally occurring in a tank of hot wort to guide the wort into a flow pattern which causes the trub, as it settles out by gravity, to accumulate at the centre of the bottom of the vessel. This is achieved by means of a circular float with a hollow cylinder attached to its underside, fitting over another hollow cylinder standing on the tank bottom. Gaps at the base of the lower cylinder and between the float and the upper cylinder allow the hot wort to circulate in the desired pattern. Evaporation occurs at the surface, in the ring shaped space between the float and the tank wall, assisted by natural or artificial ventilation. This cools the wort, which flows down the outside of the cylinders, in through the bottom and up the centre of the cylinder, depositing trub in the process. Trials showed that flocculation was more rapid and formed larger particles, and that consequently the trub settled out more rapidly and completely, than in a whirlpool processing the same quantity of identical wort. In addition to producing a brighter wort in a shorter time than a whirlpool, this device, being powered by the heat already present in the wort, has no pump and consequently consumes no extraneous energy. Although the cleaning process required by the equipment is somewhat more elaborate, it is not difficult and no hygiene problems have been encountered. The invention has been patented in the USA.
Keywords : comparative test convection equipment performance separation trub whirlpool wort