Idan zafin ƙafewar tsarin sanyaya sanyi ya yi ƙasa da 0 ° C, wani Layer na sanyi zai bayyana a saman na'urar evaporator, wanda ke shafar ingancin canja wurin zafi. Saboda haka, narkewa akai-akai shi ma muhimmin ɓangare ne na kula da adana sanyi. Akwai hanyoyi da yawa na narkewa. A halin yanzu, masana'antun ginin adana sanyi galibi suna amfani da hanyoyi guda biyar: narkewa ta wucin gadi, narkewar lantarki, narkewar iska mai zafi, narkewar ruwa, narkewar ruwan zafi.
1. Narkewar da hannu shine cire layin sanyi da hannu a saman bututun fitar da iskar gas. Ana iya yin wannan hanyar ba tare da dakatar da kayan aikin sanyaya ba. Wannan hanyar tana ɗaukar lokaci kuma tana da wahala, kuma tasirin narkewar ba shi da kyau.
2. Narkewar lantarki shine a sanya hita ta lantarki a kan na'urar dumama iska don ta narke da dumama ta lantarki. A lokacin narkewar, a dakatar da matsewa ko a daina ciyar da na'urar dumama iska. Narkewar lantarki yana da fa'idodin ƙarancin farashi da sauƙin sarrafawa, amma farashin aiki yana da yawa. Ana amfani da shi gabaɗaya don narkewar kayan adana sanyi, ba don narkewar kayan sanyaya ba. Don yanayin zafi daban-daban, buƙatun ƙwarewar rufi dole ne su bambanta, kuma ƙarfin sanyaya da ake buƙata dole ne ya bambanta. Ya kamata a keɓance wurin adana sanyi bisa ga yanayin aikace-aikacen abokin ciniki da aikace-aikacensa, sai dai idan babu wata buƙata ta musamman don ɗaukar hanyar daidaitawa.
3. Narkewar iskar gas mai zafi shine amfani da tururin firiji mai zafi da na'urar compressor ke fitarwa don sakin zafi a cikin na'urar evaporator da kuma narke layin sanyi a saman na'urar evaporator. Tsarin narkewar iskar gas mai zafi yana da rikitarwa kuma farashi yana da yawa. Amma tasirin narkewar ya fi kyau. Idan aka yi amfani da shi a cikin tsarin ammonia, man da aka tara a cikin na'urar evaporator kuma ana iya fitar da shi zuwa magudanar ruwa ko ma'ajiyar zagayawar iska mai ƙarancin matsin lamba. A cikin tsarin narkewar iskar gas mai zafi, galibi ana sarrafa matsin lamba a 0.6MPa. Yi ƙoƙarin amfani da iskar gas mai ƙarfi da aka fitar daga na'urar compressor mataki ɗaya don narkewar. Lokacin hunturu na iya zama da kyau don rage ruwan sanyaya ko rage adadin na'urorin comdenser, ƙara zafin shaye-shaye, rage lokacin narkewar. Ga tsarin ammonia, ya kamata a haɗa ammonia mai zafi don narkewa da bututun shaye-shaye na mai raba mai.
4. Narkewar ruwa shine fesa ruwa a saman na'urar fesawa don narke layin sanyi. Tsarin narkewar ruwa yana da tsari mai rikitarwa da tsada mai yawa, amma kyakkyawan tasiri da ƙarancin farashi. Narkewar ruwa zai iya cire layin sanyi kawai a saman na'urar fesawa, kuma ba zai iya magance mummunan tasirin tarin mai a cikin na'urar fesawa akan canja wurin zafi ba. Abu mafi mahimmanci shine allon ajiya na sanyi, wanda galibi ana samarwa a gaba ta masana'antar allon ajiya na sanyi kuma yana da tsayi, faɗi da kauri. Allon ajiya na sanyi mai kauri 100mm yawanci ana amfani da shi don adana sanyi mai zafi da matsakaici, allon ajiya mai kauri 120mm ko 150mm yawanci ana amfani da shi don adana zafi mai ƙarancin zafi da adanawa.
5. Narkewar ruwan zafi ta hanyar iskar zafi ita ce hanyoyi guda biyu na narkewar zafi da narkewar ruwa da ake amfani da su a lokaci guda, waɗanda ke tattara fa'idodin duka biyun, kuma suna iya cire layin sanyi da sauri da inganci a saman narkewar kuma kawar da tarin mai a cikin narkewar. Lokacin narkewar, ana fara aika iskar zafi zuwa narkewar don raba layin sanyi daga saman narkewar, sannan a fesa ruwan don a wanke layin sanyi da sauri. Bayan an yanke wadatar ruwa, saman narkewar yana "bushe" ta hanyar iska mai zafi don hana fim ɗin ruwan saman daskarewa da shafar canja wurin zafi. A da, masana'antun allon ajiya na sanyi galibi suna amfani da polyethylene da polystyrene azaman kayan aiki. Yanzu akwai ingantaccen aiki na allon sandwich polyurethane. Yawan kayan rufin kumfa na polystyrene yana da ƙasa, ba za a iya rufe shi ba. Yawanci ana amfani da su a cikin kayan aiki na musamman. Polyethylene abu ne mai kyau na asali. Ta hanyar wani rabo, ana iya fitar da kumfa daga yawan da ya dace, tasirin rufi yana da kyau, ƙarfin ɗaukar kayan rufi yana da ƙarfi. Farantin polyurethane ya fi kyau, yana da ingantaccen aikin kariya kuma baya shan danshi, amma wannan farashin ajiyar sanyi ya ɗan fi girma.
Lokacin Saƙo: Disamba-08-2023