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Na'urar busar da zafin iska tana amfani da ka'idar sake zagayowar Carnot don zana zafi daga iska da canza shi zuwa ɗakin, haɓaka zafin jiki don taimakawa wajen bushewa abubuwa. Ya haɗa da ƙaƙƙarfan evaporator (naúrar waje), kwampreso, na'ura mai ƙyalƙyali (naúrar ciki), da bawul ɗin faɗaɗa. Refrigerant yakan fuskanci evaporation (yana sha da zafi daga waje) → matsawa → condensation (fitar da zafi a cikin ɗakin bushewa na cikin gida) → tarwatsewa → zafi mai zafi da sake amfani da shi, ta haka yana motsa zafi daga yanayin ƙananan zafin jiki na waje zuwa ɗakin bushewa yayin da refrigerant ke kewaya cikin tsarin.

A cikin tsarin bushewa, mai zafi mai zafi yana dumama dakin bushewa a cikin sake zagayowar. Bayan isa ga yanayin da aka saita a cikin ɗakin bushewa (misali, idan an saita shi a 70 ° C, mai zafi zai daina aiki kai tsaye), kuma lokacin da zafin jiki ya faɗi ƙasa da matakin da aka saita, injin ɗin zai dawo da dumama kai tsaye. Ana kula da ƙa'idar cire humidification ta hanyar isar da mai ƙidayar lokaci. Relay mai ƙidayar lokaci zai iya ƙayyade tsawon lokacin rage humidification na fan mai cire humidification bisa la'akari da zafi a cikin ɗakin bushewa (misali, tsara shi don gudana na minti 1 kowane minti 21 don cire humidification). Ta hanyar amfani da mai ƙidayar lokaci don sarrafa lokacin cire humidification, yana hana asarar zafi sosai a cikin ɗakin bushewa saboda rashin iya daidaita lokacin dehumidifying lokacin da ƙarancin danshi a cikin ɗakin bushewa.