3-28E A wall is constructed of two layers of 0.6-in-thick sheetrock (k = 0.10 Btu/h-ft-°F), which is a plasterboard made of two layers of heavy paper separated by a layer of gypsum, placed 7 in apart. Thespace between the sheetrocks is filled with fiberglass insulation (k = 0.020 Btu/h-ft F). Determine (a) the thermal resistance of the wall and (b) its R-value of insulation in English units.FIGURE P3-28EFiberglassinsulationSheetrock0.6 in7 inI 0.6 in

Thickness of fiber glass insulation, L = 7 in.Thermal conductivity of sheetrock Ks = 0.10 Btu/h. ft.…

Answered: 3-28E A wall is constructed of two…

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

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Q2: For the wall construction shown in figure below determine; في الشكل الموضح أدناه احسب: 1- The oerall heat transfer coefficient for the wall U. 2- Rate of heat transfer through the wall 3- The temperature T3 Take the thickness of inner and outer layers, 150mm and 50mm respectively. . معامل انتقال الحرارة الكليU ۲. معدل انتقال الحرارة. ۳. درجة الحرارة T3 اتحذ سمك طبقة الجدار الداخلية 150mm وسمك الطبقة الخارجية 50mm. T, T, T3 h=10w/m²°c To=-10°c Ti=20°C k,=1.6 k=0.14 h,=40w/m²°C A=1.5m*0.8m ΔΧ AX,
3. A cylindrical 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 70 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. Solve for the value of T2.
Insert Space 61 Exercise 6 A 3-194 A 4-m-high and 6-m-long wall is constructed of two large 0.8-cm-thick steel plates (k= 15 W/m-K) separated by 1-cm-thick and 22-cm-wide steel bars placed 99 cm apart. The remaining space between the steel plates is filled with fiberglass insulation (k=0.035 W/m-K). If the temperature difference between the inner and the outer surfaces of the walls is 22°C. determine the rate of heat transfer through the wall. Can we ignore the steel bars between the plates in heat transfer analysis since they occupy only 1 percent of the heat transfer surface area? Steel plates 0.8 cm 22 cm Fiberglass insulation 99 cm 1 cm 0.8 cm Pencil + >
Q2: A 2.5 -mm-diameter electrical wire is insulated by a 2-mm-thick rubberized sheath (* = 0.11 W/m K), and the wire/sheath interface. The convection heat transfer coefficient of the outer surface of the sheath is 10 W/m² K, and the temperature of the ambient air is 20 C. If the temperature of the insulation may not exceed 50 C, what is the maximum allowable electrical power that may be dissipated per unit length of the conductor? What is the critical radius of the insulation?
2-91 The inner and outer surfaces of a 5-m x 6-m brick wall of thickness 30 cm and thermal conductivity 0.69 W/m-C are maintained at temperatures of 20°C and 5°C, respectively. Determine the rate of heat transfer through the wall, in W. Brick wall -30 cm- 20°C 5°C
Saved Help Save & Exit A 2-kW resistance heater wire with thermal conductivity of k= 70 W/m-K, a diameter of D= 4 mm, and a length of L = 0.9 m is used to boil water. If the outer surface temperature of the resistance wire is Ts= 230°C, determine the temperature at the center of the wire. (Round your answer to a single decimal place.) 230 C -D→ es Resistance heater The temperature at the center of the wire is °C 18°C Clear ^ 4 ENG
If 3.9 kg metal with 92 °C temperatures is immersed into 6 kg of water at 10 °C, what will be the final temperature of the water after immersion? Cp metal = 0.911 KJ/kg-K
Please solve this, thank you very much
A pipe of length L connects to thermal reservoirs that are kept constant at temperatures T₁ and T₂. The pipe contains a gas with a thermal conductivity K, a density p, and a heat capacity cp. What is the temperature T of the gas in the tube at a distance x = 0.2L away from the thermal reservoir with temperature T₁ ? Select one: a. b. T = 0.5(T₁+T₂) T = T₁ +0.2 (T₂-T₁) c. T = T₁ +0.2(T₂-T₁) d. T = T₁ +0.2(T₁ - T₂)
Determine the resistance (in F-h/BTU) of a hollow cylinder with an inside and outside radius of 2 in and 2.2 in, respectively. The length of the cylinder is 4 ft while the thermal conductivity is 22 BTU/hr-ft-F
HEAT TRANSFER (a) Determine the thermal conductivity of an insulating material given the following data: steel pipe with 0.1025 m inner diameter and 0.1150 m outer diameter, insulation thickness 3 cm, heat flow per meter is 150 W/m, steel thermal conductivity 55 W/m-°C, and overall temperature difference of 72.2°C. If the temperature of the steam inside the pipe is 128°C, (b) find the outside temperature of the insulating material.
Q1/ Consider a 4-m-high, 6-m-wide, and 0.3-m-thick brick wall whose thermal conductivity is k = 0.8 W/m °C. On a certain day, the temperatures of the inner and the outer surfaces of the wall are measured to be 14°C and 6°C, respectively. Determine the rate of heat loss through the wall on that day.

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