Derive the equation from (Node at an internal Corner with convection). 2 (Tm-1, n + Tmin + 1) + ( Tm+lin + Tmin-1) m-1, n Ay Ax- 1 1 + 2 hox Tw-2 (3+ hax) Tm²n=0 m, n+1 1 12 Th m.n-1 m+ 1, n
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- Calculate the R-factor (film resistance) for the following situations: (a) windblowing over a wall, h = 5 88 W⁄m2 ⋅K, and (b) still air inside a room near awall, h=1.47 Wm2 ⋅ K.A horizontal pipe having a surface temperature of 67 °C and diameter of 25 cm is buried at a depth of 1.2 m in the earth at a location where k = 1.8 W/m-°C. The earth surface temperature is 15 °C. Calculate the shape factor if the pipe length is 10 m.Because you forgot to let the pipes drip during a freezing night, a section of an outdoor pipe is now frozen. The frozen section is L = 1 m long and the inner pipe diameter is D = 1.8 cm. During the day, the pipe is exposed to the cold air, the Sun, and the radiating surroundings. The cold air temperature is T∞ = -10°C, and has convection heat transfer coefficient h = 20 W/m2·K. The Sun provides solar irradiance of Gsun = 1350 W/m2. The steel pipe surface has absorptivity α = 0.6 and emissivity ε= 0.1. The surroundings, such as vegetation, houses, ground, etc. can be assumed to be blackbody held at Tsur = 280 K. A) Using the energy conservation system illustrated below, establish an equation that describes the stored energy in the section of frozen water (Est). B) Determine the amount of time needed to melt the ice in the pipe. Ice has density ρ= 920 kg/m3, and latent heat of fusion hsf = 334 kJ/kg. The ice is Tw = 0°C. Ignore conduction through the pipe walls – assume the pipe…
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