Lub plhaub thiab cov raj kub tshuab hluav taws xob tsuas yog tsim ntawm lub plhaub, raj pob, ntawv raj thiab taub hau yas. Ntawm lawv, ib qho kua dej (feem ntau yog cov kua txias txias) ntws hauv lub raj sab, thiab lwm yam kua (feem ntau yog cov kua kub) ntws hauv lub plhaub sab. Vim tias qhov sib txawv kub ntawm ob, tshav kub yog pauv los ntawm qhov siab- kua dej kub rau cov kua dej qis, yog li pom qhov kev hloov pauv kub.
Tshwj xeeb, thaum cov kua dej nkag rau hauv lub plhaub sab, nws cov cua sov pauv mus rau cov kua txias hauv lub raj sab hauv phab ntsa. Txoj kev hloov cua sov no tsis yog tsuas yog ua tau zoo, tab sis kuj tseem tuaj yeem tswj qhov kub thiab txias ntawm cov kua dej. In addition, the shell and tube heat exchanger can also be designed as a single-pass or multi-pass structure according to actual needs to meet different heat exchange requirements.