A 250mm steam main, 225metres long is covered with 50mm of high temperature insulation (k = 0.095W/m K) and 40 mm of low temperature insulation (k = 0.065W/m K). The inner and outer surface temperatures as measured are 400°C and 50°C respectively. Calculate : The total heat loss per hour. [5] The total heat loss per m2 of outer surface.  [5] The heat loss per m2 of pipe surface.   [4] The temperature between the two layers of insulation.      [4]     Neglect heat conduction through pipe material

Steel pipe (outer diameter 100 mm) is covered with two layers of insulation. The inner layer, 40 mm thick, has a thermal conductivity of 0.07 W / (m K). The outer layer, 20 mm thick, has a thermal conductivity of 0.15 W / (m K). Pipes are used to deliver steam with a pressure of 800 kPa. The temperature on the outer insulation surface is 24 ° C. If the pipe is 10 m long, determine the following: (assuming that the conduction heat transfer resistance of the steel pipe and the vapor convection resistance are negligible).        a. Heat loss per hour. = AnswerkJ / hr.        b. Temperature between insulation layers. = Answer ° C.

A steel pipe (outside diameter 100 mm) is covered with two layers of insulation. The inside layer, 40 mm thick, has a thermal conductivity of 0.07 W/(m K). The outside layer, 20 mm thick, has a thermal conductivity of 0.15 W/(m K). The pipe is used to convey steam at a pressure of 600 kPa. The outside temperature of insulation is 24°C. If the pipe is 10 m long, determine the following, assuming the resistance to conductive heat transfer in steel pipe and convective resistance on the steam side are negligible: a. The heat loss per hour. b. The interface temperature of insulation.

I am struggling with this question. Part a and b

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6. A 1.5 m pipe of negligible thickness holding a hot fluid at 140°C and having an outer diameter of 0.4 m is insulated with three layers of each 50 mm thick insulation of k₁ = 0.02; k2 = 0.06; and k3= 0.16 W/m-K (starting from inside). The outside surface temperature is 30°C. Determine a. the heat loss in Watts, b. the temperatures between interfaces of insulating layers in °C

2. A steam line is covered with two successive layers of insulation. The 1.6 in thick layer in contact with the pipe is asbestos which is covered with a 1.4 inch thickness of magnesia insulation. The internal pipe diameter is 3 in, the pipewall thickness is 0.40 in made from common brick. The steam temperature is 850ºF, and the internal surface film coefficient is 50 Btu/hr.ft².F, while the ambient outer temperature is 105°F and the outer surface film coefficient is 3.0 Btu/hr.ft².F. Calculate the following: a. value of U based upon the external area of the magnesia covering, Btu/hr.ft2.F b. heat loss from the steam for a length of 190 feet of pipe, Btu/hr

QUESTION 3 A steel pipe 150mm external diameter conveys steam at a temperature of 260°C and is covered by two layers of lagging, each 50mm thick. The thermal conductivity coefficient of the inside layer of lagging is 0.0865W/mK while that of the outside layer is 0.0952W/mK. The outside surface temperature of the steel pipe can be taken as being the same temperature of the steam. The ambient temperature is 27°C and the heat transfer coefficient of the outside surface is 15W/m2K. Calculate: 3.1 the heat lost/hr for a pipe length of 30m;

A cubical piece of heat-shield-tile from the space shuttle measures 0.17 m on a side and has a thermal conductivity of 0.065 J/(s·m·C°). The outer surface of the tile is heated to a temperature of 1050°C, while the inner surface is maintained at a temperature of 23°C. (a) How much heat flows from the outer to the inner surface of the tile in 3.0 minutes? (b) If this amount of heat were transferred to 1.5 liters (1.5 kg) of liquid water, by how many Celsius degrees would the temperature of the water rise?

Calculate the quantity of heat conducted per minute through a duralumin circular disc 127 mm diameter and 19 mm thick when the temperature drop across the thickness of the plate is 5 degrees Celsius. Take the coefficient of thermal conductivity of duralumin as 150 W/(m-K).