Nkoog ziab yog cov txheej txheem kom qhuav, tab sis txawv ntawm cov dej qhuav, thaum khov kom qhuav yog cov txheej txheem kom qhuav yog tseem hu ua sublimation ziab. Quav qhuav yog ib txoj kev ua kom lub cev qhuav dej. Qhov zoo dua ntawm lub cev qhuav dej kom qhuav yog tias nws tuaj yeem khaws cov duab, xim thiab cov as-ham ntawm cov khoom.
Nkoog-kom kom qhuav tsis tshua muaj tshwm sim hauv lub xeev ntuj, yog li lub nkoj tshwj xeeb yog xav tau los tsim ib puag ncig ib puag ncig kom khov-qhuav. Lub nkoj no yog qhov khov-kom qhuav chav. Lub khov-kom qhuav chamber feem ntau muaj ob daim:
1. Paus plaub. Cov chav sib txig zoo rau lub cav tshuab hluav taws xob, yog li cov ntaub ntawv khov kho tshuab hluav taws xob uas yuav tsum tsis siv neeg ntim feem ntau ua raws li cov duab sib dhos.
2. Cylindrical. Muaj qhov sib txawv ntawm sab hauv thiab sab nraud ntawm cov chav khov-kom qhuav, yog li cov khoom noj kom qhuav-kom qhuav tshuab yog feem ntau ua rau hauv ib qho cylindrical.
Ntxiv rau ntawm chav tsev, khov-kom qhuav yuav tsum tub yees, nqus tsev thiab cov cua sov ua kom tsim sublimation rau cov txheej txheem khov. Yog xav paub ntxiv, thov hu rau Kemolo.