1- Calculate the critical radius of insulation for asbestos (k = 0.172 W/m. K) surrounding a pipe and exposed to room air at (300 K) with (h = 2.8 W/m2. K). Calculate the heat loss rom a (475 K), (60 mm) diameter pipe when covered with the critical radius of nsulation and without insulation. %3D %3D

1- Calculate the critical radius of insulation for asbestos (k = 0.172 W/m. K) surrounding a pipe and exposed to room air at (300 K) with (h = 2.8 W/m2. K). Calculate the heat loss rom a (475 K), (60 mm) diameter pipe when covered with the critical radius of nsulation and without insulation. %3D %3D

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

I need a step by step answer please :)
Question 1 The exterior wall of a building consists of 100 mm thick face brick (k = 0.9 W/m-K), 40 mm thick polystyrene insulating board (k = 0.036 W/m-K), 125 mm thick concrete block (k = 1.8 W/m-K) and 15 %3D mm thick interior gypsum board (k = 0.18 W/m-K). The inside and outside convective heat transfer coefficients are 6.5 W/m2-K and 22.5 W/m2-K, respectively. The outside air temperature is -5°C and the inside air temperature is 20°C. The wall is 3 m high and 15 m long. Calculate the rate of heat loss (in W) through the wall. Round your answer to 2 decimal places. Add your answer Follow-up question to Question 1, calculate the temperature (in °C) of the interior surface of the wall. Round your answer to 2 decimal places. Add your answer Follow-up question to Question 1, calculate the temperature (in °C) of the exterior surface of the wall. Round your answer to 2 decimal places. Add your answer
Two water columns are at different temperatures, one being at 35°C and the other being at 18oC. The water columns are separated by a glass wall of area Im by 2m and a thickness of 0.005m. Calculate the amount of heat transfer. (Thermal Conductivity of glass is 1.6 W/mK) TABLE 13-13 Typical values of resistance for common building materials R, m K/W R for thickness shown, m K/W Building material Building board Eypsum, 9.5 mm particle board Building membrane 2 layers, 0.73 kg/ns³ felt 0.056 7.35 0.21 Glass single glazing. 3 mm double glazing. 6 mm air space triple glazing, 6 mm air space 0.16 0.32 0.47 Insulating material Blanket and batt mineral fiber from glass, approx. 90 mm approx. 150 mm approx. 230 mm approx. 275 mm glass fiber, organic bonded loose fill milled paper spray applied polyurethane foam Roofing 2.29 3.32 5.34 6.77 27.7 23 40 asphalt shingles buil-up, 10 mm 0.077 0.058 Masonry brick 1.15 concrete 0.6 Siding materials hardboard, 1l mm 0.12 plywood, 9.5 mm Aluminum or…
There are 2 options to be considered to form the insulation layer between the refractory brick and air space, which are fiberglass and firebrick. Calculate the minimum thickness required for the both fiberglass and firebrick. Which option do you recommend? Comment. State the assumption in your calculation. Based on your recommendation, calculate the temperature at each interface throughout the wall and draw a temperature variation diagram from inside wall surface to outside wall surface. * Refractory brick Fiberglass or firebrick? 0.5" Plaster Heat Ambient source Air spáce 4 Concrete block Figure 2
Two inches of urethane foam will reduce heat loss close to 1000% when applied to a 2-inch diameter uninsulated steel pipe. Assume the pipe wall thickness is 0.25-inches, the pipe interior convective heat loss (hi) is 500 BTU/hr-ft2-oF, and the pipe outside convective heat loss ho 20 BTU/hr-ft2-oF, k steel is 25 BTU/hr-ft-oF, and k insulaton is 0.023 BTU/hr-ft-oF. (hint - calculate heat loss with and without insulation.
To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from a production field. (1) Consider a pipe-in-pipe configuration consisting of concentric steel tubes with an intervening insulating material. The inner tube is used to transport warm crude oil through cold ocean water. The inner steel pipe (k, = 45 W/m-K) has an inside diameter of D₁, 1 = 150 mm and wall thickness t; = 20 mm while the outer steel pipe has an inside diameter of D₁,2 = 250 mm and wall thickness to = 1;. Determine the maximum allowable crude oil temperature to ensure the polyurethane foam insulation (k = 0.055 W/m-K) between the two pipes does not exceed its maximum service temperature of 7p,max = 70°C. The ocean water is at T, = -5°C and provides an external convection heat transfer coefficient of h, = 500 W/m²K. The convection coefficient associated with the flowing crude oil is h; = 450 W/m².K. (2) It is proposed to enhance the performance of the…
Stainless steel type 304 [k = 16.3 W/m-K] from heat treatment was brought to a room @ 27C. It is in cube form and has an edge of side 20cm. Initially, the temp. of the steel from the heat treatment is 500C. The total effective heat transfer coefficient is 18 W/m2-K. How long will it take for the surface of the cube to be within 28 C of the room temp.?
Calculate the critical radius of insulation for asbestos (k=0.17 W/m.C) surrounding a pipe and exposed to room air at 17 C with h= 3 W/m².C. Calculate the heat loss from a 180 C, 3.5 cm diameter pipe when covered with the critical radius of insulation and without insulation.
Thermal energy is being transferred through a 0.8 mm layer of human skin at a rate of 1.1 x 104 W/m?. The room temperature is 27 °C. (a) Determine the thermal conductivity of the skin.
What is the thermal resistance of a 3 in fired clay brick with density of 120 Ibm/ft3 a. 0.422 b. 6.8 c. 0.48 d. 6.2
brick and 1. An outside wall for a building consists of a 10-cm (k=0.69 W/m-C) layer of common a 2.5 cm layer of fiber glass (k= 0.05 W/m-C). Calculate the heat flow through the wall for 25 C temperature differential.. 10 cm 2.5cm
Question 1 A composite component is comprised of a tube and a concentric rod running inside it, both with a length of 1.5 meters. The tube is made of copper and has inner and outer diameters of 60 mm and 100 mm, respecti vely, a coefficient of thermal expansion and elastic modulus of 17 x10-6C and 117 GPa, respectively. The rod is made of aluminium with a diameter, coefficient of thermal expansion and elastic modulus of 50 mm, 23 x10-6C and 80 GPa, respectively. If the composite is exposed to a temperature rise of 120°C, determine: The sense and magnitude of the stresses induced in the composite if it is not restrained. 1.1 1.2 The sense and magnitude of the stresses induced in the composite ifit is partially restrained with an allowed free expansion of 0.3 mm.