Njira zodziwika bwino za firiji zomwe zimagwiritsidwa ntchito m'makina achangu-zozizira ndi izi:
Compressor Refrigeration: Iyi ndi njira yodziwika kwambiri. Imagwiritsa ntchito kompresa kukanikiza firiji kuti ikhale yotentha-yotentha kwambiri,{2}}gasi wopanikizika kwambiri, ndipo kenako amakongoletsedwa kukhala madzi ndi condenser. Pambuyo pokhumudwa ndi chipangizo chogwedeza, chimalowa mu evaporator, kutengera kutentha kuchokera kumalo ozungulira kuti akwaniritse kuziziritsa. Njira imeneyi ndi yabwino kwambiri, yokhwima mwaukadaulo, ndipo imalola kuwongolera bwino kutentha, zomwe zimapangitsa kuti izigwiritsidwa ntchito kwambiri m'makina osiyanasiyana ofulumira-ozizira.
Mufiriji wa Nayitrojeni wamadzimadzi: Nayitrojeni wamadzimadzi amakhala ndi kutentha kochepa kwambiri. Akabayidwa m'makina ofulumira-woziziritsa, nayitrojeni wamadzimadziwo amasungunuka, kutengera kutentha kwakukulu ndikuziziritsa chakudya mwachangu. Njira yopangira firijiyi imapereka kuziziritsa kwachangu kwambiri ndipo imatha kusunga zopatsa thanzi komanso kukoma kwa chakudya kwambiri.
Dry Ice Refrigeration: Madzi oundana owuma amatsika ndikutenga kutentha kwakukulu, motero amapeza kuziziritsa. Dry ice refrigeration ndiyosavuta kugwiritsa ntchito ndipo safuna zida zovuta.
