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Show transcribed image text Steam in T-80C 2. (30 pts) Consider one of the pipes in a steam condenser where steam condenses at 80°C around the outside of pipes through which water flows to carry out the heat of condensation. Since 0c condensation heat transfer coefficient is very high, the thin- walled entire pipe can be assumed to be at 80 °C. Consider one of the 25 mm diameter, thin-walled metal pipes; water enters the pipe/tube at 15°C as fully developed flow with a velocity of 1 m/sec. It is desired to find the length of the pipe L such that the outlet water temperature from the condenser is 50°C. Neglect any radiation Water S C a. Is the water flow laminar or turbulent through the pipe? b. What is the convective heat transfer coefficient m Condensate T-80°C between the water and the pipe? What is the necessary length of the pipe needed to get the desired water outlet temperature (Hint. Base your calculations on ΔTLMTD between the water and the pipe) of 50°C? c. Pr = 5.5 Water Properties: ρ = 1,000 kgin' ; cr" 4.18 kJ/kg. K ; μ = 0.8 x 103 kg/s.m ; v-0.8 x 10"m2/s ; α = 0.147 x 10^ ㎡/s ; k-0.613 W/rn.K :
Steam in T-80C 2. (30 pts) Consider one of the pipes in a steam condenser where steam condenses at 80°C around the outside of pipes through which water flows to carry out the heat of condensation. Since 0c condensation heat transfer coefficient is very high, the thin- walled entire pipe can be assumed to be at 80 °C. Consider one of the 25 mm diameter, thin-walled metal pipes; water enters the pipe/tube at 15°C as fully developed flow with a velocity of 1 m/sec. It is desired to find the length of the pipe L such that the outlet water temperature from the condenser is 50°C. Neglect any radiation Water S C a. Is the water flow laminar or turbulent through the pipe? b. What is the convective heat transfer coefficient m Condensate T-80°C between the water and the pipe? What is the necessary length of the pipe needed to get the desired water outlet temperature (Hint. Base your calculations on ΔTLMTD between the water and the pipe) of 50°C? c. Pr = 5.5 Water Properties: ρ = 1,000 kgin' ; cr" 4.18 kJ/kg. K ; μ = 0.8 x 103 kg/s.m ; v-0.8 x 10"m2/s ; α = 0.147 x 10^ ㎡/s ; k-0.613 W/rn.K :
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