# Svar till övningsuppgifterna. ηi ηit - TA Driftteknik

Formelsamling Fysik 1

You could just use 0.0036 as a direct multiplier to get from W/m2 to MJ/m2/Hour. * Last updated by: ChipsNSalsa on 9/25/2008 @ 4:47 PM * Log in or register to post/reply in the forum. 1 W/m2 = 0.003599 MJ/m2h 1 W/m2 = 0.086401 MJ/m2d 1 W/m2 = 0.001433cal/cm2min kcal/m2 1 kcal/m2 = 0.00419 MJ/m2 1 10^6 * 1s * 1 w/m2 = 1 MJ/m2 注意，两个单位实际不是一种单位，相互间差了一个时间单位的因子，如上式的s The convection heat transfer coefficients at the inner and the outer surfaces of the tank are 80 W/m2·K and 10 W/m2·K, respectively. Determine (a) the rate of heat transfer to the iced water in the tank and (b) the amount of ice at 0ºC that melts during a 24-h period. The heat of fusion of water at atmospheric sure is hif=333.7 kJ/kg.