Wort pre-cooling and its influence on casting
The results of tests carried out in a brewery on a commercial scale are reported in this article. The whirlpool temperature was reduced from 98 to 89°C by cooling during casting, resulting in a noticeable decrease in thermal stress on the wort.
Conditions permitting thermal reactions still exist in the whirlpool during hot break separation and wort cooling. In contrast to wort boiling, due to the absence of convection movement, evaporation of volatile substances formed is minimal. Insufficient thermal cleavage of DMS precursor during wort boiling in particular may cause problems during the subsequent hot holding period. Using this method, unwanted aroma substances are expelled immediately ahead of wort cooling (1). This has been confirmed by casting in by-pass without cooling....
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