Vharuvhu yekuwedzeredza chikamu chakakosha chesystem yekutonhodza, inowanzoiswa pakati pesilinda yekuchengetera mvura ne evaporator. Vharuvhu yekuwedzeredza inoita kuti refrigerant yemvura patembiricha yepakati uye kumanikidzwa kwakanyanya kuve utsi hwakanyorova patembiricha yakaderera uye kumanikidzwa kwakaderera kuburikidza nekukweva kwayo, uye refrigerant inotora kupisa mu evaporator kuti iwane mhedzisiro yekutonhodza. Vharuvhu yekuwedzeredza inodzora kuyerera kwevharuvhu kuburikidza nekuchinja kwakanyanya kwekupisa pamagumo e evaporator kudzivirira kushandiswa kushoma kwenzvimbo ye evaporator uye chiitiko chekugogodza silinda.
Zvichitaurwa zviri nyore, vharuvhu yekuwedzera inoumbwa nemuviri, package yekuona tembiricha uye chubhu yekuyera chiyero.
Mamiriro akanaka ekushanda kwevharuvhu yekutambanudza anofanira kunge ari ekuchinja kuvhurika kwayo panguva chaiyo uye kudzora mwero wekuyerera kwemvura nekuchinja kwemutoro we evaporator. Asi kutaura chokwadi, nekuda kwe hysteresis yekuchinja kwekupisa mu envelopu inoona tembiricha, mhinduro yevharuvhu yekutambanudza inogara ichinonoka zvishoma nezvishoma. Kana tikadhirowa dhayagiramu yekuyerera kwenguva yevharuvhu yekutambanudza, tichaona kuti haisi curve yakatsetseka, asi mutsetse wavy. Hunhu hwevharuvhu yekutambanudza hunoratidzwa muhukuru hwemafungu. Kana amplitude yakakura, maitiro evharuvhu anononoka uye hunhu hwayo hunowedzera kuipa.
