A thick-walled tube of stainless steel with thermal conductivity k = 19 W/m°C has inner diameter of 10 cm and outer diameter of 30 cm is covered with 5 cm layer of asbestos insulation with thermal conductivity k = 0.2 W/m°C. If the inside of the pipe and outside of insulator temperature is maintained at 600°C and 100°C respectively. Determine the heat loss per meter length of pipe and the tube-insulation interface temperature.

150 circular copper fins (k = 400 W / m ° C) of 5 cm diameter and 1 mm thickness are attached to a pipe of 3 cm diameter and 150 cm length, the outer surface of which is kept at 220 ° C. The gap between the wings is 9 mm and the pipe is in an environment at 22 ° C. Since the heat transfer coefficient between the pipe and the ambient air is 80 W / m2 ° C, calculate the heat transfer amount from the finned pipe. Find the amount of increase in heat transfer.

A thick-walled tube of stainless steel (L = 0.50 m; k = 21.63 W/m-K) with an inside diameter of 0.0254 m and outside diameter of 0.0508 m, is covered with an insulation (∆x =0.0254 m) with k = 0.2423 W/m-K. If the inside wall temperature of the pipe is at 400 oC, calculate the temperature at the interface between the metal and the insulation (in oC) if the outside surface of the insulation is at 29.8 oC. 99 K in Pa.

A cast iron pipe (k = 80 W/m - oC) whose inner and outer diameters are 5 cm and 5.5 cm respectively is coverd with a 3 cm thick glass wool insulation (k = 0.05 W/m - oC) The temperature at the inner surface of the pipe is 320 oC and the interface temperature between the pipe and insulation is 300 oC. Determine the surface temperature of the insulation.

Calculate the heat loss through a 100-ft² wall with an inside temperature of 65°F and an outside temperature of 35°F. Assume the exterior wall is composed of 2- in. of material having a 'k' factor of 0.80, and 2-in. of insulation having a conductance of 0.16. RTotal = 8.75 & Q = 342-Btu/hr RTotal = 9.2 & Q = 399-Btu/hr RTotal = 8.75 & Q = 399-Btu/hr RTotal = 9.2 & Q = 342-Btu/hr Hide hint for Question 3 Utilize the (RTotal = 1/C + x1/k1) equation.

Water flows through a cast steel pipe with k = 53 W/m-K with an outer diameter of 110 mm and 3.5 mm wall thickness. Calculate the thickness of insulation to be lagged on the pipe if the heat transfer per unit length is 6.5 W/m. The thermal conductivity of the insulation is 0.045 W/m-K. The water temperature is 15°C with convective heat transfer coefficient of 30 W/m2 -K while the outside air is -8°C and 18 W/m2 -K.

Consider a power transistor encapsulated in an aluminum case that is attached at its base to a square aluminum plate of thermal conductivity k= 240W/m.K, thickness L= 6mm, and width W= 20mm. The case is joined to the plate by screws that maintain a contact pressure of 1 bar, and the back surface of the plate transfers heat by natural convection and radiation to ambient air and large surroundings at T∞ =Tsur -25°C. The surface has an emissivity of ε=0.9, and the convection coefficient is h=4 W/m².K. The case is completely enclosed such that heat transfer may be assumed to occur exclusively through the base plate. a) If the air-filled aluminum-to-aluminum interface is characterized by an area of A₁=2×10-4 m² and contact resistance of R+c= 1.375 K/W, what is the maximum allowable power dissipation if the surface temperature of the case, Ts,c, is not to exceed 85°C? S,C' Transistor case Ts. Pelec S,C' Enclosure W Isur Base plate, (k,ε) Interface, Ac Air Th 801 b) How much should the h be…

An industrial cold room has four 200 mm thick walls made of concrete. The walls are insulated on the outside with a layer of foam 60 mm thick. Cladding with a thickness of 15 mm protects the foam on the outside from the elements. The composite wall surface temperatures are –3 °C on the inside and 18 °C on the outside of the room respectively. The thermal conductivities of concrete, foam and cladding are 0.75, 0.35 and 0.5 W/m K respectively.   Assuming perfect thermal contact between the layers of the composite walls, draw the typical temperature distribution across the layers and determine the heat energy gained per hour through all 4 walls of the room with a total surface area of 20 m2. What does this heat energy represent in terms of the refrigeration system of the cold room?

qo =4x107 W/m3 heat is produced in a spherical shaped radioactive material with a diameter of R = 0.2 m. The heat produced is released from the spherical surface to the environment in a stable regime. Thus, the temperature on the surface is kept constant at T=80°C The heat transmission coefficient of the object is given as k = 15W / m ° C. The temperature of the spherical body changes only in the radial direction. (T = T (r)). The distribution of temperature in a spherical body: =0 It is defined in the form. T, a) Obtain the temperature distribution T (r). b) Determine the boundary conditions. Find the maximum temperature. (Tmax)

I JUST NEED HELP WITH THE RED MARKED AREAS, THANKS!