Kuberako ibiryo bitetse biri muburyo bwo gukonjesha vacuum, icyerekezo cyo guhererekanya ubushyuhe gikorerwa kuva mubiribwa bikagera hejuru, bityo ubwiza bwimiterere yikigo cyibiribwa ntibuzangirika mugihe cyubushyuhe bwo hejuru, kandi ibiryo bikonje bizaba bishya kandi byoroshye. 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.