b) A steel pipe with heat transfer coefficient of 42 W/mK contains flowing water. The outer diameter of the pipe is 90 mm and the wall thickness is 3mm. Calculate: i. ii. The heat loss by convection and conduction per meter length of un-insulated pipe when the water temperature is 14°C, the outside air temperature is -10°C, the water side heat transfer coefficient is 30 KW/m²K and the outside heat transfer coefficient is 20 KW/m²K. Calculate the corresponding heat loss when the pipe is lagged with insulation having an outer diameter of 200 mm, and thermal conductivity of K = 0.05 W/mK c) A composite wall is composed of 5 sections as represented in the below diagram. The temperature at the left side is 25°C and at the right side is 90°C and h = 15 W/m2 K on both sides. The coefficient of heat transfer are k₁ = k3= 80 W/mK, k₂ = 120 W/mK, k4 = 100 W/mK, and ks = 150 W/mK. Determine: i. The total thermal resistance, ii. Heat transfer rate through the composite. 2 3 cm,2 cm, 3 cm 79 24 cm 8 cm 6 cm 2 cm
b) A steel pipe with heat transfer coefficient of 42 W/mK contains flowing water. The outer diameter of the pipe is 90 mm and the wall thickness is 3mm. Calculate: i. ii. The heat loss by convection and conduction per meter length of un-insulated pipe when the water temperature is 14°C, the outside air temperature is -10°C, the water side heat transfer coefficient is 30 KW/m²K and the outside heat transfer coefficient is 20 KW/m²K. Calculate the corresponding heat loss when the pipe is lagged with insulation having an outer diameter of 200 mm, and thermal conductivity of K = 0.05 W/mK c) A composite wall is composed of 5 sections as represented in the below diagram. The temperature at the left side is 25°C and at the right side is 90°C and h = 15 W/m2 K on both sides. The coefficient of heat transfer are k₁ = k3= 80 W/mK, k₂ = 120 W/mK, k4 = 100 W/mK, and ks = 150 W/mK. Determine: i. The total thermal resistance, ii. Heat transfer rate through the composite. 2 3 cm,2 cm, 3 cm 79 24 cm 8 cm 6 cm 2 cm
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The question is about concepts of heat transfer and heat transfer rates. I need answers to part b) and c) of the question and I have attached them. Kindly please solve part b) and c) showing all formulas used and working used to arrive at the solution.
Transcribed Image Text:b) A steel pipe with heat transfer coefficient of 42 W/mK contains flowing water. The outer
diameter of the pipe is 90 mm and the wall thickness is 3mm. Calculate:
i.
ii.
The heat loss by convection and conduction per meter length of un-insulated pipe
when the water temperature is 14°C, the outside air temperature is -10°C, the water
side heat transfer coefficient is 30 KW/m²K and the outside heat transfer coefficient
is 20 KW/m²K.
Calculate the corresponding heat loss when the pipe is lagged with insulation having
an outer diameter of 200 mm, and thermal conductivity of K = 0.05 W/mK
c) A composite wall is composed of 5 sections as represented in the below diagram. The
temperature at the left side is 25°C and at the right side is 90°C and h = 15 W/m2 K on both
sides. The coefficient of heat transfer are k₁= k3 = 80 W/mK, k₂ = 120 W/mK, k4 = 100 W/mK,
and ks = 150 W/mK. Determine:
i.
The total thermal resistance,
ii.
Heat transfer rate through the composite.
5
3 cm,2 cm, 3 cm
2779
24 cm
6 cm
2 cm
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