Muchirevo chezvivakwa zvinoshandisa simba, "U-value" kazhinji inoreva kupisa kwechinhu kana chikamu, chinozivikanwawo seU-factor kana U-value, inova chiyero chekugona kwechinhu kutamisa. kupisa pachikamu chetembiricha musiyano pachikamu chenguva kuburikidza nechikamu chepamusoro penzvimbo, uye inowanzoratidzwa mumayuniti eW/m²-K (watts per square metre per kelvin).
Iyo yakaderera iyo U-kukosha, zviri nani kuvharirwa kwezvinhu uye zvakanyanya kushanda pakumisa kuendeswa kwekupisa, nokudaro kuvandudza simba resimba rechivako. Mukugadzira-simba rinoshanda rekuvaka, kusarudza zvinhu zvine yakaderera U-values kwakakosha kudzikisa mashandisiro esimba pakudziya nekutonhodza.
Kunyangwe U-value (kana U-factor) iri pasi rose, U-tsika inogona kuratidzwa muzvikamu zvakasiyana. Munyika zhinji, kukosha kweU kunoratidzwa muzvikamu zveSI.
Munyika zhinji, kukosha kweU kunoratidzwa sezvikamu zveSI,
W/(m2⋅K):
MuUnited States, iyo U-kukosha inoratidzwa seBritish thermal units (Btu) paawa-square tsoka-madhigirii Fahrenheit.
Btu/(h⋅ft2⋅°F)
Mugwaro rese iri, U-tsika dzinoratidzwa seSI kunze kwekunge zvataurwa neimwe nzira. Kushandura SI kuenda kuUS tsika tsika, patsanura ne5.678.
Thermal conductivity yakaderera muzvikamu zvakavharidzirwa zvakanaka zvechivako uye yakakwirira muzvikamu zvisina kuvharwa zvakanaka. u-values inofunga kurasikirwa nekuda kwekupisa kwemwaranzi, kupisa kupisa, uye kupisa conduction.
Kunyangwe iwo mayunitsi ekupisa kwekushisa kwakafanana nekupisa kwemafuta coefficients, thermal conductivity inosiyana pakuti kupisa kupisa coefficients inongoshandiswa kutsanangura kupisa kwemhepo mumvura, nepo thermal conductivity inoshandiswa kurerutsa equations nemhando dzakasiyana dzakasiyana dzekupisa kupisa.
Inotsanangurwa neiyo equation inotevera:
φ = A × U × (T1 - T2) uko Φ ndiyo inotamisa kupisa mumawatts, U ndiyo inotamisa kupisa, T 1 ndiyo tembiricha kune rimwe divi rechimiro, T 2 ndiyo tembiricha kune rimwe divi rechimiro. , uye A inzvimbo iri masikweya mita.
Iyo yekupisa yekufambisa kwemadziro mazhinji uye matenga anogona kuverengerwa uchishandisa ISO 6946 kunze kwekunge paine simbi yekuvharisa bhiriji, mune iyo nyaya ISO 10211 inogona kushandiswa. Kune akawanda epasi pasi, ISO 13370 inogona kushandiswa. Kune akawanda mahwindo, iyo yekupisa yekufambisa inogona kuverengerwa uchishandisa ISO 10077 kana ISO 15099.
ISO 9869 inotsanangura maitiro ekuyedza kuyera kupisa kwekufambisa kwechimiro. Sarudzo yezvishandiso uye kunaka kwekuisirwa kune yakakosha pesvedzero pakubudirira kwekuvhara hwindo. Iko kuumbwa uye kuiswa chisimbiso kaviri kwehwindo system ndiyo chaiyo isina simba mapoinzi ekuvhara hwindo.
Nguva yekutumira: Aug-15-2024