Ngenxa yokuthi ukudla okuphekiwe kumodi yokupholisa ye-vacuum, i-Heat Transfer Direction yenziwa kusuka endaweni ephansi yokudla, ngakho-ke ikhwalithi yokudla yesikhungo sokudla ngeke ichithwe esiteji sokushisa esiphakeme, futhi ukudla okupholile kuzothuthukiswa futhi kuhlafuna kakhulu. Ngemuva kwesikhathi se-Vacuum Pre-CooLing sifinyelela emazingeni okushisa aphansi asendaweni esethiwe, ibhokisi le-vacuum le-pre-couler likhishwa ukuze lingene kwinqubo elandelayo: Ukupakishwa kwe-Vacuum.
Ukudla okuphekiwe Ukudla Okuphoqelwe kuqala kuyimishini ekhangayo yokupholisa yokudla okushisa okuphezulu (njengemikhiqizo evuswe yimikhiqizo, amasobho) ukupholisa ngokushesha nangokulinganayo, futhi ngempumelelo ususe amagciwane alimazayo.