Nkag Siab Txog Kev Rwb Thaiv R-Tus Nqi: Ib Phau Ntawv Qhia Txog Chav Kawm Thiab Kev Hloov Pauv
Thaum nws los txog rau kev ua tau zoo ntawm kev rwb thaiv tsev, ib qho ntawm cov ntsuas tseem ceeb tshaj plaws uas yuav tsum xav txog yog tus nqi R. Tus nqi no ntsuas qhov kev tiv thaiv ntawm kev rwb thaiv tsev rau kev ntws cua sov; tus nqi R siab dua qhia txog kev ua tau zoo dua ntawm kev rwb thaiv tsev. Txawm li cas los xij, tus nqi R tuaj yeem qhia tau hauv ntau chav sib txawv, tshwj xeeb tshaj yog hauv US Customary Units (USC) thiab Imperial System (Imperial System). Tsab xov xwm no yuav tshawb nrhiav cov chav R-tus nqi siv rau kev rwb thaiv tsev thiab yuav ua li cas hloov pauv ntawm ob lub tshuab no.
Tus nqi R yog dab tsi?
Tus nqi R yog ib qho kev ntsuas ntawm kev tiv taus cua sov uas siv hauv kev lag luam tsim kho. Nws ntsuas lub peev xwm ntawm cov khoom siv los tiv taus kev hloov pauv cua sov. Tus nqi R yog qhov tseem ceeb hauv kev txiav txim siab qhov ua tau zoo ntawm kev rwb thaiv tsev hauv kev ua kom koj sov thaum lub caij ntuj no thiab txias thaum lub caij ntuj sov. Tus nqi R siab dua, qhov rwb thaiv tsev zoo dua.
Tus nqi R yog xam raws li cov khoom siv tuab, thermal conductivity, thiab thaj chaw uas cua sov raug xa mus. Cov mis rau kev xam tus nqi R yog raws li nram no:
\[ R = \frac{d}{k} \]
Qhov twg:
- \(R\) = tus nqi R
- \(d\) = cov khoom tuab (hauv meters lossis nti)
- K = thermal conductivity ntawm cov khoom (hauv Watts ib 'meter'-Kelvin lossis British thermal units ib teev-foot-Fahrenheit)
Cov chav ntsuas R-tus nqi
Hauv Tebchaws Meskas, R-tus nqi feem ntau yog qhia nyob rau hauv Imperial system, siv cov chav xws li BTUs (British Thermal Units) thiab square feet. Cov chav rau R-tus nqi hauv Tebchaws Meskas yog:
**Tus nqi R (Imperial)**: BTU·h/ft²·°F
Qhov sib txawv, lub kaw lus metric siv cov chav sib txawv, uas tuaj yeem ua rau tsis meej pem thaum piv cov ntaub ntawv rwb thaiv tsev hauv thaj chaw sib txawv. Cov chav metric rau R-tus nqi yog:
- **Tus nqi R (metric)**: m²·K/W
Hloov ntawm cov chav nyob
Yuav kom piv tau cov ntaub ntawv rwb thaiv tsev rau ntau thaj chaw lossis ntau lub tshuab sib txawv, nws yog ib qho tseem ceeb kom nkag siab txog yuav ua li cas hloov R-tus nqi ntawm Imperial thiab Metric systems. Kev hloov pauv ntawm ob lub units no yog raws li kev sib raug zoo ntawm BTUs (British Thermal Units) thiab watts, nrog rau qhov sib txawv ntawm thaj chaw thiab qhov kub.
1. **Los ntawm Imperial mus rau Metric**:
Yuav hloov cov nqi R los ntawm Imperial mus rau Metric, koj siv tau cov qauv hauv qab no:
R_{metric} = R_{imperial} \times 0.1761 \
Qhov no txhais tau tias rau txhua tus nqi R uas tau hais ua lus Askiv, muab nws sib npaug los ntawm 0.1761 kom tau txais tus nqi R sib npaug hauv metric.
2. **Los ntawm Metric mus rau Imperial**:
Ntawm qhov tod tes, txhawm rau hloov tus nqi R los ntawm metric mus rau imperial, cov mis yog:
\[ R_{Imperial} = R_{Metric} \times 5.678 \]
Qhov no txhais tau tias rau txhua tus nqi R uas qhia hauv metric, muab nws sib npaug los ntawm 5.678 kom tau txais tus nqi R sib npaug hauv imperial.
Qhov tseem ceeb ntawm kev ua tau zoo
Kev nkag siab txog kev hloov pauv ntawm cov chav ntsuas imperial thiab metric ntawm R-value yog qhov tseem ceeb rau cov kws kes duab vajtse, cov neeg ua vaj tse, thiab cov tswv tsev. Thaum xaiv cov khoom rwb thaiv tsev, koj yuav pom R-values hauv ntau yam sib txawv, tshwj xeeb tshaj yog nyob rau hauv kev lag luam thoob ntiaj teb uas cov khoom tuaj ntawm ntau lub tebchaws sib txawv.
Piv txwv li, yog tias tus tswv tsev nyob hauv Tebchaws Meskas xav yuav cov khoom rwb thaiv tsev uas muaj tus nqi R ntawm 3.0 m²·K/W, lawv yuav tsum hloov qhov no mus rau cov chav imperial kom piv rau cov khoom hauv zos. Siv cov mis hloov pauv, tus nqi R hauv cov chav imperial yog:
\[ R_{imperial} = 3.0 \times 5.678 = 17.034 \]
Qhov no txhais tau tias cov rwb thaiv tsev muaj tus nqi R ntawm kwv yees li 17.0 BTU·h/ft²·°F, uas tuaj yeem piv rau lwm cov ntaub ntawv rwb thaiv tsev hauv khw.
Yog li ntawd, R-tus nqi yog ib qho cim qhia tseem ceeb rau kev ntsuam xyuas kev ua haujlwm thermal ntawm cov ntaub ntawv rwb thaiv tsev. Kev nkag siab txog R-tus nqi units thiab kev hloov pauv ntawm US cov chav tsev ib txwm muaj thiab imperial yog qhov tseem ceeb rau kev txiav txim siab txog kev rwb thaiv tsev. Txawm hais tias koj yog tus tsim kho, tus kws kes duab vajtse, lossis tus tswv tsev, qhov kev paub no yuav pab koj xaiv cov rwb thaiv tsev zoo rau koj cov kev xav tau, xyuas kom meej tias koj qhov chaw nyob yog txuag hluav taws xob thiab xis nyob. Raws li kev lag luam kev tsim kho txuas ntxiv mus, kev nkag siab txog cov kev ntsuas no yog qhov tseem ceeb rau kev coj ua hauv tsev zoo thiab kev txuag hluav taws xob.
Yog tias koj muaj lus nug, thov hu rau pab pawg Kingflex.
Lub sijhawm tshaj tawm: Lub Yim Hli-11-2025
