Ragewar thermal

Ƙarƙashin zafi shine tsarin haɗa iska na ciki a cikin gini don kawar da yadudduka masu ma'ana da cimma daidaiton zafin jiki a cikin ambulan ginin.

 Thermal stratification a cikin gine-gine 
Lalacewa ita ce juyar da tsarin yanayin yanayin yanayin zafi, wanda shine shimfidar yanayin yanayi daban-daban (yawanci karuwa) daga bene zuwa rufi. Matsala yana faruwa ne ta hanyar iska mai zafi da ke tashi zuwa rufi ko sararin rufin saboda ya fi sauƙi fiye da iska mai sanyaya da ke kewaye. Akasin haka, iska mai sanyi tana faɗowa ƙasa yayin da ta fi iskar zafi da ke kewaye da ita.

A cikin keɓaɓɓen gini, bambancin zafin jiki na zuwa 1.5°C kowace ƙafa ta tsaye ya zama ruwan dare, kuma idan rufin ginin ya fi girma, mafi girman bambancin zafin zai iya zama.Thermal Destratification in Buildings: The missing piece to the HVAC puzzle" (PDF). Energy Services and Technology Association. January 2013. Archived from the original (PDF) on 2015-07-01 A cikin matsanancin yanayi, an sami bambancin zafin jiki na 10 ° C sama da tsayin mita 1. Sauran sauye-sauyen da ke tasiri matakin ƙaddamarwar thermal sun haɗa da yanayin zafi da mutane ke samarwa da tsarin da ke cikin ginin, rufin sararin samaniya daga yanayin yanayin waje, samun hasken rana, ƙayyadaddun tsarin HVAC, wurin samar da bututun mai da dawowa, da motsin iska a tsaye a cikin sararin samaniya, yawanci ana ba da shi ta hanyar magoya bayan lalata. Za'a iya amfani da sauye-sauye na ruwa na lissafi don tsinkayar matakin daidaitawa a cikin sarari.

 Sakamakon thermal stratification 
A cikin binciken da Ƙungiyar Ƙwararrun suka ɗauka suka ɗauka suka ɗauka don ƙaddamarwa ya karu akai-akai dangane da bambancin zafin jiki daga bene zuwa rufi (ΔT).BSRIA. "Wasted Energy Due to Stratification". Retrieved 23 February 2018. Binciken ya nuna cewa keɓaɓɓen gine-gine suna yin zafi sosai ko yin sanyi bisa la'akari da yanayin zafin jiki a ma'aunin zafi da sanyio, wanda ke nuna ƙasa da ƙarfin zafin da ke cikin ɗakin. Har ila yau, binciken ya nuna cewa sharar makamashin makamashi saboda ƙaddamarwa ya kasance a cikin rufin rufin daga 20 ft. zuwa 40 ft, kuma mafi girman rufi ya haifar da asarar makamashi mai yawa, ko da a daidai ΔT. Tun da ΔT ya kasance mafi girma a cikin dogon rufi, tasirin rarrabuwa yana haɓaka, yana haifar da sharar makamashi mai yawa a cikin manyan gine-gine.

 Ma'anar lalata 
Tunda ƙaddamarwa da farashin da ke tattare da shi na layi ne, ma'anar ɓarna zai bambanta dangane da ra'ayi da yanayin amfani. Cikakken ɓarna, ko 0° ΔT daga bene zuwa rufi, ba zai yuwu ya faru a kowane gini ba. Tunda farashin ƙaddamarwa yana raguwa a layi yayin da ΔT ke gabatowa 5.4 ° F, kuma babu wani binciken da ya riga ya kalli tasirin ƙaddamarwa a ƙasa 5.4 ° F, ba sabon abu ba ne a yi la'akari da kowane sarari tare da ΔT da ke ƙasa 5 ° F da za a lalata. A {asar Amirka, ASHRAE Standard 55 ya tsara 3°C a matsayin iyaka ga bambancin zafin iska a tsaye tsakanin matakan kai da idon sawu, amma ba shi da ma'auni da ke ba da shawarar ΔT mai kyau tsakanin bene da rufi.Standard 55-2004 -- Thermal Environmental Conditions for Human Occupancy (ANSI Approved). Atlanta, GA: ASHRAE.

 Fasahar lalata 
Ana iya samun cim ma rage raɗaɗin zafin jiki ta hanyar sarrafa masu canji waɗanda ke da alaƙa da haɓakawa. Tun da yawancin masu canji, gami da tsayin rufi, mutane da matakai, samun hasken rana, da yanayin yanayin waje ba za a iya sarrafa su ba, mafi yawan fasahohin da ake amfani da su suna da alaƙa da tsarin HVAC na ginin ( dumama, iska, da kwandishan). Ɗaya daga cikin mafi arha, mafi inganci, kuma mafi sauƙi don shigar da fasahar shine magoya bayan lalata, gami da duka magoya bayan axial destratification da magoya bayan HVLS (ƙananan ƙaranci).

 Axial destratification Fans 
Magoya bayan axial destratification raka'a ne masu haɗaka da kansu waɗanda aka sanya su a cikin tsararru a rufi tare da burin busa iska mai sanyi a cikin rufin ƙasa zuwa ƙasa, inda mutane ke rayuwa da aiki. Saboda an tsara magoya bayan axial don busa iska kai tsaye a ƙasa, ana iya amfani da su a cikin rufi da tsarin rufi fiye da 100 ft. tsayi. Saboda axial destratification magoya baya iya cimma lalata tare da ƙananan CFMs, yana da mahimmanci cewa iskar da ke barin bututun ya sami saurin iska a ƙasa tsakanin 0.2 da 0.5 m/s. Sakamakon wannan matakin motsi na iska shine haɗuwa da iska mai iska daga rufi tare da iska a matakin ƙasa. Rashin yin tasiri a bene zai haifar da lalacewa na tsaka-tsakin iska amma ba a cimma nasara a kasa ba. Tunda yankin da ke kusa da ma'aunin zafi da sanyio ba zai lalace ba a wannan misalin, ana hasashen cewa za a sami ɗan kuɗi kaɗan ko babu kuɗi, kamar yadda ma'aunin zafi da zafi zai ci gaba da yin zafi ko sanyaya ɗaki.

Gwaji a cikin ɗaki mai tsayin ƙafa 21 ya ba da ajiyar kuɗi na 23.5% tare da amfani da magoya bayan axial destratification.Cold Weather Destratification Energy Evaluation" (PDF). Enbridge. June 2017. Archived from the original (PDF) on 24 February 2018. Retrieved 23 February 2018.

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