Kuberako ibiryo bitetse biri muburyo bwo gukonjesha vacuum, icyerekezo cyo guhererekanya ubushyuhe gikorwa kuva murwego rwibiryo kugeza hejuru, bityo ubwiza bwimiterere yikigo cyibiribwa ntibuzangirika mugihe cyubushyuhe bwinshi, kandi ibiryo bikonje bizaba bishya kandi chewy. Nyuma yigihe vacuum mbere yo gukonjesha igera kubushyuhe buke bwateganijwe, agasanduku ka vacuum ya pre-cooler karasunikwa kugirango kinjire mubikorwa bikurikira: gupakira vacuum.
Ibiryo bitetse vacuum pre-cooler nibikoresho byiza byo gukonjesha ibiryo bitetse ubushyuhe bwo hejuru (nkibicuruzwa bikaranze, ibicuruzwa bya sosi, isupu) kugirango bikonje vuba kandi neza, kandi bikureho neza bagiteri zangiza.