# seminarska fizika

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- - : : : :. -. , 2012 . . , , . . : : . : - U-. U- Heat-Unit -. 1 2 1 () (W/m2 K). (), . : () W/m2 K :U= 1/R R ( ) m2 K/ W. U- R :R = Rsi + 11 + 22 + 33 + 44 + 55 + Rse Rsi , Rse , d __ [kg/m3] [J/kg*k][W/m2K] mm/m/1000C 52016700,1401,55,0 210010501,40301,1 12009600,1942,0007,0 808400.0410.05.. 22009601,51301,0R = Rsi + 11 + 22 + 33 + 44 + 55 + RseR = 0.17 + 0,025/0,140 + 0,04/1,40 + 0,001/0,19 + 0,02/0,041 + 0,118/1,51 + 0.04 R = 0.17 + 0,178 + 0,21 + 0,005 + 0,488 + 0,078 + 0.04R = 1,169 m2K/WU= 1/R = 1/1,169U=0,855 W/ m2K [kg/m3] [J/kg*k][W/m2K] mm/m/1000C 18501,500,70151,1 300,025 220010500,40301,0 80010500,367 808400.0410.05- 9008400.0211.21.25R = Rsi + 11 + 22 + 33 + 44 + 55 + 66 + RseR = 0.13 + 0.01/0.70 + 0.05/0.025 + 0.01/0.40 + 0.25/0.36 + 0.05/0.041 + 0.015/0.21 + 0.04R = 0.13 + 0.014 + 2 + 0.025 + 0.69 + 1.21 + 0.071 + 0.04R = 4.18 m2K/WU= 1/R = 1/4.18U=0.239 W/ m2K [kg/m3] [J/kg*k][W/m2K] mm/m/1000C 78004000.19600.0001.2 50016700.09983.050016700.09983.00.16 808400.0410.05- 9008400.0211.21.25R1 = [Ax1 * (Rsi + 11 + 22 + Rse) + Ax2 * ( Rsi + 11 + 22 + Rse) ] / AxR1 = 0.05 * (0.10 + 0.00055/0.19 + 0.025/0.16 + 0.04) + 0.60* (0.10 + 0.00055/0.19 + 0.025/0.099 + 0.04)R1 = 0.05 * (0.10 + 0.0028 + 0.15 + 0.04) + 0.60 * (0.10 + 0.0028 + 0.25 + 0.04) R1 = 0.01464 + 0.23568R1 = 0.25032 / 0.65R = 0.3851 m2K/WR1 = Rsi + 11 + 22 + 33 + 44 +RseR2 = 0.10 + 0.025/0.099 + 0.225/0.16 + 0.10/0.041 + 0.012/0.021 + 0.04R2 = 0.10 + 0.25 + 1.40 + 2.43 + 0.57 + 0.04R2 = 4,79 m2K/WR1 + R2 = 0.3851 + 4.79R = 5.1751 m2K/WU= 1/R = 1/5.1751U=0,193 W/ m2K