A hollow spherical steel has an inner diameter of 30cm and outer diameter of 37cm. It is covered with insulation of 5cm thick. The inner surface of the steel is kept at a constant temperature of 100°C and outside insulation is 30°C. The thermalconductivity of the material is 0.65 W/m-k. By what percentage will the rate of loss be decreased if the thickness of the insulation is increased by 4cm?O a. 16.65%O b. 83.35%O c. 79.57%O d. 20.43%O e. None

A hollow spherical steel has an inner diameter of 30cm and outer diameter of 37cm. It is covered with insulation of 5cm thick. The conductivity of the material is 0.65 W/m-k. By what percentage will the rate of loss be decreased if the thickness of the insulation O a. 16.65% O b. 83.35% O c. 79.57% O d. 20.43% Oe. None inner surface of the steel is kept at a constant temperature of 100°C and outside insulation is 30°C. The then s increased by 4cm?

A hollow spherical steel has an inner diameter of 30cm and outer diameter of 37cm. It is covered with insulation of 5cm thick. The conductivity of the material is 0.65 W/m-k. By what percentage will the rate of loss be decreased if the thickness of the insulation O a. 16.65% O b. 83.35% O c. 79.57% O d. 20.43% Oe. None inner surface of the steel is kept at a constant temperature of 100°C and outside insulation is 30°C. The then s increased by 4cm?

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

Compare the different heat flux resulting from conduction through 1 in. of the follow·ing materials when subjected to a 30"F temperature difference: copper, steel, wood,glass fiber.
The left side of a composite wall is kept at 300oC constantly. The right side of the same wall is exposed to air at 20oC with a convection coefficient of 32 W/mk. kA = 10 W/mK, kB = 40 W/mK, kC = 1 W/mK, kD = 300 W/mK, kE = 0.1 W/mK Given figure 1, calculate: a) The total thermal resistance of the wall.b) The total heat rate through the wall.c) The junction temperature where B meets D (between second and third column)
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
Thermal Conductivity of Skin" Design experiments and calculate heat transfer coefficients/thermal conductivity (k)
why the resistance of small machine is greater than the resistance of the large machine??
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.
105 W/m3 heat is uniformly generating within a 4 cm thick slab. The slab is exposed to ho = 10 W/m2K and To = 20 °C ambient conditions from its both sides. What is the surface temperature of the slab? A. 420 °C B. 200 °C C. 220 °C D. 100 °C
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
What is(roughness)? what is its effect on heat transfer? Write one or two pages providing schemes or illustration for more demonstration.
Can you help me provide 2 more assumption of the study A Comparative Analysis of Thermal Performance on Insulation Systems Among Melted Beer Bottles, Plywood, and PE Foam Insulation Assumption of the Study The researchers based this study on the following assumptions: Melted Beer bottle glass is more efficient and durable than PE Foam Insulation. 2. 3.
A heating element made of tungsten wire connected to a large battery that has negligible internal resistance. When the heating element reaches 80.0°C, it consumes electrical energy at a rate of 480 W. Assume that the temperature coefficient of resistivity has the value given in Table 25.2 in the textbook and that it is constant over the temperature range in this problem. In the equation R(T) = Ro [1 + a(T - To)] take To to be 20.0°C. Part A What is its power consumption when the temperature of the heating element is 110.0°C? Express your answer with the appropriate units. P = Submit Value Provide Feedback Request Answer Units ?