A steel pipe (k = 43 W/m K) carries a heat‐transfer fluid and is covered with...

A steel pipe (k = 43 W/m K) carries a heat‐transfer fluid and is covered with a 2‐cm layer of calcium silicate insulation (k = 0.029 W/m K) to reduce the heat loss. The inside and outside pipe diameters are 5.25 cm and 6.03cm, respectively. If the inner pipe surface is at 150°C and the exterior surface of the insulation is at 25°C, calculate: (a) The rate of heat loss per unit length of pipe (b) The temperature of the outer piper surfac

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Amanda K answered 2 years ago

The heat transfer coefficient of a steel (k = 43 W/m · K) tube (1.9 cm...

The heat transfer coefficient of a steel (k = 43 W/m · K) tube (1.9 cm ID and 2.3 cm OD) in a shell-and-tube heat exchanger is 500 W/m2 · K on the inside and 120 W/m2 · K on the shell side, and it has a deposit with a total fouling factor of 0.000176 m2 · K/W. Calculate a. The overall heat transfer coefficient b. The cleanliness factor, and percent over surface.

Steam at a temperature of 280 DegreeC flows in a steel pipe (k=70 W/m K) having...

Steam at a temperature of 280 DegreeC flows in a steel pipe (k=70 W/m K) having an inner and outer diameter of 5 cm and 5.6 cm. The pipe is covered with glass wool insulation (k=0.05 W/m K) to a thickness of 4 cm. On a windy day heat is lost from the lagging surface with a convective heat transfer coefficient of 50 W/m2 K. The surroundings are at a temperature of 5 DegreeC and the internal heat transfer coefficient...

The rate of heat transfer, Q [energy/time = power] through a pipe wall between a fluid...

The rate of heat transfer, Q [energy/time = power] through a pipe wall between a fluid and the surroundings depends on fluid properties: density (ρ), viscosity (μ), specific heat (cp [energy/temperature/mass]); and also on pipe and flow properties: the length (l), diameter (D), and thermal conductivity (λ [power/length/temperature]) of the pipe, fluid mean velocity (V), and the temperature difference (ΔT) between the pipe wall and the surroundings. Use dimensional analysis to express this system in terms of dimensionless numbers. The...

Water flows at 112°C through a steel pipe (k=90 W/m °C) which has a 6 cm...

Water flows at 112°C through a steel pipe (k=90 W/m °C) which has a 6 cm inside diameter and 8cm outside diameter. Such that, hi =346 W/m2 °C and ho =6.0 W/m2 °C. Surrounding air temperature is 20°C. To reduce heat loss to the surroundings the pipe is covered with an insulation insulation having the thickness of 4.0 mm and k=0,5W/m°C . Calculate; a. The heat loss by convection per unit length from the bare pipe (before insulation). b....

3. A stainless steel sphere of thermal conductivity 16 W/m · K with a diameter of...

3. A stainless steel sphere of thermal conductivity 16 W/m · K with a diameter of 4 cm is exposed to a convective environment of 15 W/m2 · K, 20?C. Heat is generated uniformly in the sphere at a rate of 1.0 MW/m3 . Determine the steady-state temperature of the sphere at its center and its surface. Also determine the heat flux at a radius of 1.5 cm.

A pipe transporting a fluid has an internal diameter of 5.0 m. The fluid has a...

A pipe transporting a fluid has an internal diameter of 5.0 m. The fluid has a flow rate of 5.00 × 10−2 m3 /s and a viscosity of 1.00 × 10−3 N/m2 ∙s. The fluid has a density of 695 kg/m3 and a pressure of 1.62 × 104 Pa. Consider the fluid to be ideal. a) Calculate the speed of the fluid in the pipe. b) What is the maximum diameter that the pipe must have if the flow is...

Fluid X is flowing in a circular pipe with a constant velocity ν (m/s). The fluid...

Fluid X is flowing in a circular pipe with a constant velocity ν (m/s). The fluid is cooled by a jacket kept at constant temperature, Tj. Fluid velocity is plug shaped , in other words uniform at radial positions. Assume that temperature is uniform in radial positions because of turbulent flow conditions; ρ and Cp of the fluid are constants. The inlet temperature (at z=0) is constant and uniform at To (To>Tj). Assume that thermal conduction of heat along the...

Heat Transfer in a Steel Pan A medium sized steel pan is used to boil water...

Heat Transfer in a Steel Pan A medium sized steel pan is used to boil water on top of an electric range. Approximately 85% of the 1000 W produced by the heating unit is transferred nearly uniformly into the pot during use. Express the most appropriate form of the heat diffusion equation that describes the heat transfer through the bottom section of the pan. Include all relevant boundary conditions. The bottom section of the pan has a thickness of 0.5...

An insulated steel pipe carries hot water at 80 ºC. The outer surface of the insulation...

An insulated steel pipe carries hot water at 80 ºC. The outer surface of the insulation loses heat to the environment by convection and radiation. For convection, assume hconv = 5.8 W/m2.ºC. The emissivity of the insulation is 0.88 and conductivity, k = 0.038 W/mK. The surroundings are at 30 ºC. Assume the inner surface of the insulation is at the water temperature. What is the surface temperature of the insulation?

Discuss how turbulence influence the heat transfer process in convection pipe flow

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