The evaporator ozizira yosungirako ndi kutentha exchanger amene amalola otsika kutentha madzi refrigerant kusinthanitsa kutentha kutentha ndi sing'anga amafuna firiji.

Evaporator imapangidwa ndi seti imodzi kapena zingapo za koyilo: pamene refrigerant yamadzi yotsika kutentha imalowa mu koyilo ya evaporator kuti ikuyenda. Pambuyo pa khoma la chubu limakoka kutentha kwa sing'anga (mpweya kapena madzi) kuzungulira koyilo, madzi otentha kwambiri amasanduka mpweya (amasanduka nthunzi), kotero kuti kutentha kwa sing'anga kuzungulira koyilo kumachepetsedwa kapena kusungidwa pa kutentha kwina kochepa, motero kukwaniritsa cholinga cha firiji. Pachifukwa ichi, koyilo ya evaporator iyenera kuyikidwa pamalo omwe amafunikira kuziziritsa. Evaporator ya kusungirako kuzizira imayikidwa mufiriji ndi mufiriji; evaporator ya chipinda choyatsira mpweya imayikidwa mkati mwa khoma la chipinda chokhala ndi mpweya. Ndipo monga choziziritsira mpweya, chopondera cha evaporator cha chiller cha madzi chomwe chimatulutsa madzi otsika (otchedwa madzi ozizira mu engineering) chimayikidwa mu bokosi la chipolopolo momwe madzi ozizira a chakudya amalimidwa.