Chifukwa chakudya chophikidwa chimakhala munjira yoziziritsira vacuum, njira yosinthira kutentha imayendetsedwa kuchokera pachimake cha chakudya kupita pamwamba, kotero kuti mawonekedwe a malo odyetserako sadzawonongeka pakatentha kwambiri, ndipo chakudya chokhazikika chizikhala chatsopano komanso more chew. Pambuyo pa nthawi yoziziritsa kuzizira isanakwane kutentha komwe kumayikidwa kale, bokosi la vacuum la pre-cooler limakankhidwira kunja kuti lilowe munjira yotsatira: kuyika vacuum.
Chophika chophikira cha vacuum pre-cooler ndi chida choyenera kuzizira chazakudya zophikidwa kwambiri (monga zopangidwa ndi braised, msuzi, soups) kuti ziziziziritsa mwachangu komanso mofanana, ndikuchotsa bwino mabakiteriya owopsa.