1. A beverage cooler is in the shape of a cube, 42 cm on each inside edge. Its 3.0-cm thickwall are made up of plastic (kr = 0.050 W/mK). When the outside temperature is 20°C,how much ice will melt each hour? Tice is 0°C.2. One of the possible mechanisms of heat transfer in human body is conduction throughbody fat. Suppose that heat travels through 0.03 m of fat in reaching the skin, which has atotal surface area of 1.7 m² and a temperature of 34°C. Find the amount of heat that reachesthe skin in half an hour, if the temperature at the body, interior is maintained at the normalvalue 37°C ? Thermal conductivity of body fat is k = 0.2 J/sm°C.3. The air in a room is at 25°C and outside temperature is 0°C. The window of the room hasan area of 2m² and thickness 2mm. Calculate the rate of loss of heat by conduction throughwindow ? Thermal conductivity for glass is 1 Wm¯'degree!.

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Answered: 1. A beverage cooler is in the shape of…

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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show schematic drawings, conversions, units and box in your final answers A furnace wall is made up of three layer of thickness 200 mm, 100 mm, and 125 mm with thermal conductivity of 1.65 W/m-K, k2, and 9.2 W/m-K respectively. The inside is exposed to gases at 1200°C with a convection coefficient of 25 W/m²-K and the inside surface temperature is at 1000°C, the outside air temperature is at 30°C with convection coefficient of 12 W/m²-K. Calculate: a. the unknown thermal conductivity; b. the outside surface temperature and mid-plane temperatures in °F.
The compartment below is used as a freezer of refrigerator compartment. Inner wall is at -15 C and outer wall is at 25 C. Insulator with a thermal conductivity of 0.035 W/(mK) is used to prevent the heat losses from the compartment. The shape is in square form with a side of 1.2 m and unit width into the page. Determine the thickness of the insulator if the compartment heat load is 700 W? a)5 cm b)none c)4.2 cm d)2.4 mm e)9.6 mm
A house has a 120 square meter of net exterior wall area (after subtracting for windows, doors, and so on). The outside air temperature is 38°C and the inside temperature is 20°C. Compute the rate of heat loss through an insulated wall (U 0.05 W/°C.m^2).
Q4/ A room on the second floor of a house with a balcony has a door. The door made of teak (wood) and it contains a large sheet of glass (outside winter type) in the middle and constitutes 80% of the area of the door. Door thickness is 40 mm and the temperature in the room 25. °C when the temperature is in the balcony 8 °C. Calculate the rate of heat loss from the room to the balcony through the door. The door dimensions 2m x 1m. Assume Inside and outside still air thermal resistance f= 8.29 W/m2 °C and f. 34.1 W/m2 °C respectively
A house, for cooling purposes, consists of two zones: the attic area zone A and the living area zone B (see below figure). The living area is cooled by a 2-ton air conditioning unit that removes 19 °F per thousand Btu. The time constant for heat 4 41,000 Btu/hr. The heat capacity of zone B is transfer between zone A and the outside is 2 hr, between zone B and the outside is 4 hr, and between the two zones is 4 hr. If the outside temperature stays at 90°F, how warm does it eventually get in the attic zone A? It eventually gets to be F in the attic zone A. (Type an integer or decimal rounded to the nearest hundredth as needed.) 4 hr Î A 쉽 4 hr B 2 hr 41,000 Btu/hr
1. Temperatures are measured at the left-hand face and at a point 4 cm from the left-hand face of the planar wall shown in the figure below. These temperatures are T₁ = 45.3 °C and T* = 21.2 °C. The heat flow through the planar wall is steady and one dimensional. What is the value of T2 at the right-hand surface of the wall? TI T* 4 cm 10 cm T2
A metallic plate, whose external faces are kept at temperatures T1 and T2 by a cooling fluid, has a thin-thickness resistance heater with thermal flux equal to o, as shown in the following figure. T, т, 9cond gcond - L + L The differential energy balance of this plate, in Cartesian coordinates, can be expressed by ôT pcp dy (" dy where r is the material's specific mass, cp is the material's specific heat, T is the temperature, t is the time, and x, y, z are the variables on the Cartesian axes. Consider the heat flux of this one-dimensional plate in the x direction, the constant thermal conductivity of the material, and steady state operation. Check the equation that describes this phenomenon and explain why your answer a (aT ôz dz pc. 出业姐,业逃】- ()- dz
Please help me fast.
The heat transfer across a 5" wall of firebrick is 500 W/m2. If the surface temperature thermalconductivity of brick is 0.7 Btu/hr-ft-°F, find he on cold side is 30°C and temperature on hot side. O 65.37 deg C 87.25 deg C 73.45 deg C 82.41 deg C
Question 1: In your own words, write down the differences between thermodynamic and heat transfer. (3 Marks) Question 2: Estimate the heat loss per square metre of surface through a brick wall 0.5 m thick when the inner surface is at 400 K and the outside surface is at 300 K. The thermal conductivity of the brick may be taken as 0.7 W/mK. (2 Marks) Question 3: A furnace is constructed with 0.20 m of firebrick, 0.10 m of insulating brick, and 0.20 m of building brick. The inside temperature is 1200 K and the outside temperature is 330 K. If the thermal conductivities are as shown in the figure below, estimate the heat loss per unit area. (5 Marks) 1200 K 330 K Fire brick X=0.20 m Insulating brick x=0.10 m Ordinary brick X=0.20 m k = 1.4 k = 0.21 k = 0.7 (WimK)
Q5A) Consider a composite spherical shell comprising an insulating layer of unknown thermal conductivity sandwiched between two layers of steel (k = 45 W/m. °C). The inner shell has 100 mm inner diameter and wall thickness of 5 mm. The outer shell has 150 mm inner diameter and wall thickness of 2 mm. The inner surface of inner spherical shell was experimentally found 120 °C while outer surface of outer spherical shell was at 67 °C. The ambient air was at 30 °C with heat-transfer coefficient at outer surface 6 W/m². °C. Determine thermal conductivity of insulating material. Then, experiment was repeated on another day when ambient air temperature was 13 °C. The inner surface temperature of inner shell and convection coefficient remained unchanged. Calculate temperature of outer surface of outer shell in this case.
The bottom of a 50mm diameter, 2mm thick metallic induction heater is 120C while its thermal conductivity is 60 W/m-C. The voltage and current flowing into the heater are 220V and 5A, respectively. Find the temperature at the top portion of the pan. Sketch diagram and show pertinent solutions. Box your final answer and express numerical values in 2 decimal places

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