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Faibha inonyungudutsaMuchimiro chekutamiswa kwekupisa kunogona kukamurwa kuita zvinhu zvakasiyana-siyana, kutamiswa kwekupisa kwemwaranzi yesilo ine maburi, mhepo iri mukati mesilo ine maburi uye kutamiswa kwekupisa kwefaibha yakasimba, uko kutamiswa kwekupisa kwemhepo kunofuratirwa. Kuwanda kwehuwandu netembiricha zvine hukama hwakabatana, tembiricha yakakwira, kudzikira kwehuwandu hwekesi, chiyero chekutamiswa kwekupisa kwemwaranzi chinowedzera. Kune zvigadzirwa zvefiber zvinoramba, kuwanda kwehuwandu kunowanzo kuve pasi pe0.25g/cm', porosity iri pamusoro pe90%, gas phase inogona kuonekwa seinoenderera mberi, solid phase inogona kuonekwa seisina kuenderera mberi, saka solid thermal conductivity yefaibha idiki.
Kana zvichingobva padzidziso yekuti huwandu hwehuwandu hudiki, huwandu hwekupisa hudiki, huwandu hwehuwandu hwehuwandu hwekupisa hudiki; izvi hazvienderane nemamiriro chaiwo, senge kuti huwandu hwebhora reslag hwakasiyana, kunyangwe huwandu hwehuwandu hwakafanana, huwandu hwefibers payuniti vhoriyamu hwakasiyana, zvekuti porosity payuniti vhoriyamu haina kufanana, saka pachava nemusiyano muhuwandu hwekupisa. Zvisinei, mhedziso dzemhando yepamusoro dzinogona kupfupikiswa seizvi.
1. Kufambiswa kwekupisa kwefiber dzinoramba kusimbaKuderera kunoderera nekuwedzera kwehuwandu, uye kudzikira kunoderera zvishoma nezvishoma, asi kana huwandu hwacho hwasvika padanho rakati, kupisa hakuchadziki uye kune katsika kekuwedzera zvishoma nezvishoma.
2. Pakupisa kwakasiyana, pane kuyerera kwekupisa kushoma uye kuyerera kwekupisa kushoma kunoenderana. Kuwanda kunoenderana nekuyerera kwekupisa kushoma kunowedzera nekupisa kuri kuwedzera.
3. Pahuwandu hwakafanana, mafambiro ekupisa anosiyana zvichienderana nehukuru hwemaburi.
(1) Saizi yeburi 0.1mm.
0C kupinda = 0.0244W/(m . K) 100C kana λ = 0.0314W / (m. K)
(2) Aperture 2mm.
Mukati pa0C = 0.0314W/(m, K) λ = 0. 0512W/(m . K) pa100C. K)
Dhayamita yePore iri 1mm, tembiricha inokwira kubva pa0C kusvika pa500C, kukosha kwayo kwekufambiswa kwemhepo inopisa kunowedzera ka5.3; dhayamita yepore iri 5mm, tembiricha inokwira kubva pa0C kusvika pa500C, kukosha kwayo kwekufambiswa kwemhepo inopisa kunowedzera ka11.7. Nokudaro, kana maburi ari mufiber inodzivirira, huwandu hwehuremu hunoenderana hunowedzerawo hushoma, uye kufambiswa kwemhepo inopisa kunowedzerawo.