## Question

###### Help mee!! Q1. Heat conduction & convection (38 pt). Hot water flows in a steel pipe...

Help mee!!

Q1. Heat conduction & convection (38 pt). Hot water flows in a steel pipe of 0.1 m inside diameter at a flow rate of 0.2 m/h and at an average temperature of 70 °C. The pipe length is 2.5 m and the inside pipe wall temperature is 60 °C Assume that the pipe thickness is small and the steel heat conductivity is high enough so that the thermal resistance of the pipe wall is negligible. Calculate: (a) The convective heat transfer coefficient on the inside pipe wall; (b) The heat loss from the pipe to the cold air, if the outside ambient temperature is 20 °C and the outside convective heat transfer coefficient is 17 W/(m2K). Assume steady-state conditions.

## Answers

a) Q = hA delta T neglecting R_th of pipe. heat loss from water to pipe = h_loss pipe to air hA(70 degrees C - 60 degrees C) = (17 W/m^2.K) times A times (60 degrees C - 20 degrees C) hA times 10 = 17 times A times 40 h = 68 W/(m^2.K) b) Total area = 2 pi r^2 h = 2 times pi times 0.1 times 2.5 m = 5 pi = 15.7 m^2 Heat loss = hA delta T = 68 times 15.7 times [70 - 60] = 10676 Watt

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