5.16 A thermal energy storage unit consists of a large rectan- gular channel, which is well insulated on its outer surface and encloses alternating layers of the storage material and the flow passage. Storage material Hot gas T, h Each layer of the storage material is an aluminum slab of width W = 0.05 m, which is at an initial temperature of 25°C. Consider conditions for which the storage unit

5.16 A thermal energy storage unit consists of a large rectan- gular channel, which is well insulated on its outer surface and encloses alternating layers of the storage material and the flow passage. Storage material Hot gas T, h Each layer of the storage material is an aluminum slab of width W = 0.05 m, which is at an initial temperature of 25°C. Consider conditions for which the storage unit

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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Example 16.3 Determine the thickness of a glass window 120 × 120 cm² that separates a room at temperature of 25°C from outside temperature of 44°C and allows not more than 7 × 10° cal of heat to enter the room each day. Assume thermal conductivity of glass as 0.0024 cal/cm.s.K.
14.3 The external brick wall of a building has a surface area A of 830 m² and thickness 8 of 300 mm. The wall has a thermal insulation on its outer sur- face. The thermal conductivity of concrete k is 1.6 W/m K and of insulation k; is 0.04 W/m K. The indoor and outdoor air temperatures are t₁ = 21°C and to = 3°C, respectively. The heat-transfer coefficients are h; = 14 W/m²K (on the inner surface) and h = 20 W/m²K (on the outer surface). Determine (1) the rate of heat loss through the wall without insulation and (2) the thick- ness of the insulation required to reduce the rate of heat loss by 60%.
The thermal boundary layer in heat transfer exists whenever there is a difference between the temperatures of the fluid and the outside environment. For fluid flow, how does a boundary layer form?A. Because common surfaces are not smooth, the flow is hindered, and boundary layers are formed.B. The disturbances on the streamlines in high Reynolds number flow produces boundary layer.C. The existence of walls or “boundaries” that keep the fluid inside (or outside) creates the boundary layer.D. Velocity profiles are inherently approaching no-slip condition because of the resistance of the walls.
Answer correctly and quickly as possible please. Please help me with my last three questions, I do not have any ask an expert left. Please.
The composite wall of an oven consists of three materials, two of which are of known thermal conductivity, ka = 20 W/m · Kand ke = 50 W /m · K, and known thickness, LA = 300 mm and Lc = 150 mm. The third material, B, which is sandwiched between materials A and C, is of known thickness, Lg = 150 mm, but unknown thermal conductivity kg. ka ke Air T., h Under steady-state operating conditions, measurements reveal an outer surface temperature of T, = 20°C, an inner surface temperature of T, = 600°C, and an oven air temperature of T = 800°C. The inside convection coefficient h is known to be 25 W/m? · K. What is the value of kg?
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As part of your work-study program at HTU, you successfully got a student job at your local ‘BEST-BURGER-IN-TOWN’ to help pay your own tuition and expenses. Since cylindrical frozen burger patties are cooked when placed on a hot stainless-steel cooking top, you like to think of the case as a conduction problem:a. Write down the appropriate general heat conduction equation that describes the cooking of those beef patties.b. Clearly state all assumptions.c. After cancelling the proper terms, write down the final energy equation for the patties.Do not solve for temperature distribution or heat transfer.
Please help. I am not sure how to approach this problem. This problem involves heat transfer and internal flow within a retangular channel. Thank you.
G. ?" Which matcrial has the higher themal conductivity'? d: 5. (ht What is the overall heat-transfer coefficicnt U? Describe a physical situation,in す 5コ . :- which it could be used. 石:.5 . (c) A standard Schedule 405 cm steel pipe (inside diameter 5.25 cm and wall thickness 040 cm) čarrying steam is lagged (i.e insulated) with 5.0 cm of 85 per cent magnesia covered in turn with 5.0 cm of cork. Estimate the heat loss per hour per meter of pipc if the inner surface of the pipe is at 120°C and the outer surface of the cork is at 32°C. The thermal conductivitics of the substances concerned are 9. of Material Thermal Conductivity [Watts/ha K] Steel 45 85% Magnesia (0.07 Cork 0.05 At いい 1
To cool hot oil, an engineer has suggested that the oil be pumped through a pipe submerged in a nearby lake. The pipe (external diameter = 15 cm) will be placed in the horizontal direction. The temperature of the outer surface of the pipe averages 125 ° C. The surrounding water temperature is assumed to be constant at 15 ° C. Pipe length 125 m. If it is assumed that there is no water movement. a. Determine the convective heat transfer coefficient of the outer pipe surface to the water. = Answer Watt / (m² ° C) b. Determine the heat transfer rate from the pipe to the water. = Answer kW
FROM BOOK: ENGINEERING THERMOFLUIDS, M. MASSOUD
PROBLEM: IVB-46 FROM THE BOOK: ENGINEERING THERMOFLUIDS, M. MASSOUD.