10A.4. Current-carrying capacity of wire. A copper wire of 0.040 in. diameter is insulated uni- formly with plastic to an outer diameter of 0.12 in. and is exposed to surroundings at 100°F. The heat transfer coefficient from the outer surface of the plastic to the surroundings is 1.5 Btu/hr ft F. What is the maximum steady current, in amperes, that this wire can carry without heating any part of the plastic above its operating limit of 200°F? The thermal and electrical conductivities may be assumed constant at the values given here: k (Btu/hr.ft.F) k (ohm ¹ cm ¹) 220 5.1 X 105 0.20 0.0 Copper Plastic

10A.4. Current-carrying capacity of wire. A copper wire of 0.040 in. diameter is insulated uni- formly with plastic to an outer diameter of 0.12 in. and is exposed to surroundings at 100°F. The heat transfer coefficient from the outer surface of the plastic to the surroundings is 1.5 Btu/hr ft F. What is the maximum steady current, in amperes, that this wire can carry without heating any part of the plastic above its operating limit of 200°F? The thermal and electrical conductivities may be assumed constant at the values given here: k (Btu/hr.ft.F) k (ohm ¹ cm ¹) 220 5.1 X 105 0.20 0.0 Copper Plastic

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

Related questions

Q: Heat is uniformly generated at the rate of 2 × 10° W/m³ in a wall of thermal conductivity 25 W/m•K…

A: Given Data: q=2×105w/m3 T∞,1=30°c k=25 w/m-k…

Q: A cylindrical rod of stainless steel is insulated on its exterior surface except for the ends. The…

A: According to question:- Temperature distribution within the rodT=a-bxLDiameter of the…

Q: The inner and outer surfaces of a 25-cm-thick wall are at 27 oC and 45 oC, respectively. The outer…

Q: A truncated cone 30 cm high is constructed of aluminum. The diameter at the top is 7.5 cm, and the…

Q: Problem 5. Heat is generated uniformly at a rate of Se in a copper wire of radius re having thermal…

Q: As shown in the figure, an exterior wall of a building has an average thermal conductivity of 0.32…

Q: costs Tom and Jerry are each trying to sell you a heat engine. Both engines work between high and…

Q: A group is considering installing a solar power station and has asked you for your recommendation if…

A: Given data as per question incident solar radiation on the collector = 550 W/m2 surrounding…

Q: - (II) An ideal heat pump is used to maintain the inside temperature of a house at Tin = 22°C when…

A: Given data Inside temperature of house = Tin = 22 °Cheat pump does a work rate = 1700 WThe heat loss…

Q: .Mexico's metro requires the implementation of an air conditioning system for each of its cars. On…

A: Given:Ti=45°CTf=25°CV=17 m x 2.5 x 2n=130v=0.06 m3/personQ=30 KJt=1 min

Q: The fin efficiency is defined as the ratio of the actual heat transfer from the fin to a. The…

A: Fin efficiency is the quantity which is used to determine the flow of heat in fins when actual…

Q: A plane furnace surface at 150°C covered with 1-cm-thick insulation is exposed to air at 30°C, and…

Q: a. Find the overall heat transfer coefficient = Answer W / m² ° C. b. Heat transfer rate per meter…

A: The temperature of steam flowing inside the pipe is, Ti=160 °C. Inner radius of the pipe is, r1=50…

Q: SUPPOSE THE AMBIENT TEMPERATURE IS 20degrees CELSIUS, AND THE HOT RESERVOIR CONSISTS OF A SPHERICAL…

Q: Steam at 150 ° C flows in a pipe having an inner radius of 50 mm and an outer radius of 55 mm. The…

Q: The Ocean Thermal Energy Conversion (OTEC) system in Hawai utilizes the surface water and deep water…

Q: A radioactive sphere of 20-cm diameter generates heat at the rate of 300 W. It is cooled by placing…

Q: As shown in the figure, an exterior wall of a building has an average thermal conductivity of 0.32…

A: Given:Thermal conductivity of wall, k=0.32 Btu/h.ft.°RThickness, L=5 inT1=70°FTo=30°FConvective heat…

Q: Q2- Water flows inside a steel pipe with an ID of 2.5 cm. The wall thickness is 2 mm. and the…

Question

10A.4. Current-carrying capacity of wire. A copper wire of 0.040 in. diameter is insulated uni-
formly with plastic to an outer diameter of 0.12 in. and is exposed to surroundings at 100°F.
The heat transfer coefficient from the outer surface of the plastic to the surroundings is 1.5
Btu/hr ft F. What is the maximum steady current, in amperes, that this wire can carry
without heating any part of the plastic above its operating limit of 200°F? The thermal and
electrical conductivities may be assumed constant at the values given here:
k (Btu/hr.ft.F)
k (ohm ¹ cm ¹)
220
5.1 X 105
0.20
0.0
Copper
Plastic

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 2 steps with 2 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

A solar collector and storage tank, shown in Figure (a) below, is to be optimized to achieve minimum first cost. During the day the temperature of water in the storage vessel is elevated from 25 °C (the minimum useful temperature) to tmax, as shown in Figure (b). The collector receives 260 W/m² of solar energy, but there is heat loss from the collector to ambient air by convection. The convection coefficient is 2 W/(m²*K), and the average temperature difference during the 10-hour day is (25 + tmax)/2 minus the ambient temperature of 10 °C. The energy above the minimum useful temperature of 25 °C that is to be stored in the vessel during the day is 200,000 kJ. The density of water is 1000 kg/m³, and its specific heat is 4.19 kJ/(kg*K). The cost of the solar collector in dollars is 20A, where A is the area in square meters, and the cost of the storage vessel in dollars is 101.5C, where V is the volume in cubic meters. Storage tank Collector (a) Temperature, C tmax 25°C, lowest useful…
Thermodynamics
A group is considering installing a solar power station and has asked you for your recommendation if it should be a photovoltaic system or a solar thermal system. At this stage you are asked not to include cost factors. The single point design condition they have given you is for an incident solar radiation on the collector of 550 W/m2, a surrounding temperature of 18 C. The dead state for this problem should be taken as To = 291 K, Po = 1 bar. You can perform your analysis at steady state conditions. In addition to determining the power output and first law efficiency of the options, you have been requested to determine the exergy destroyed for each of them. The photovoltaic system has an efficiency of 0.15 defined as the power output/incident solar radiation. The basic photovoltaic collector is 1.1 m2 and losses heat from both the front and back surface. The edge area can be neglected. The convective heat transfer coefficient is 10 W/m2 K. The inverter and signal…
solve the (1st) question only
Steam at 140 ° C flows in a pipe having an inner radius of 50 mm and an outer radius of 55 mm. The convective heat transfer coefficient between the steam and the inner pipe wall is 2500 W / (m² ° C). The outer surface of the pipe exposed to ambient air is 20 ° C with a convective heat transfer coefficient of 10 W / (m² ° C). Assuming steady state, calculate the rate of heat transfer per meter of pipe from steam to air. Assume that the thermal conductivity of stainless steel is 15 W / (m ° C.). Steps of work according to example 4.16 Singh. a. Find the overall heat transfer coefficient = Answer W / m² ° C. b. Heat transfer rate per meter of pipe = Answer W / m.
16
The inside wall of a furnace is at 2100oF and the outside wall is at 300oF. The wall of a furnace must be designed to transmit no more than 220 Btu/hr-ft2. Two types of bricks are available for construction:TYPE A: k = 0.38 Btu/ hr-ft-R with an allowable maximum temperature of 1400oFTYPE B: k = 0.98 Btu/ hr-ft-R with an allowable maximum temperature of 2300oF Both types of bricks have the same dimensions (9” x 4.5” x 3”) but the cost for Type B brick is twice the cost of Type A brick. If a 15 ft2 wall is to be constructed, how many bricks will be used? how many brick A and how many brick B?
The heat capacity of a liquid is 250 J/K, if its mass is 50 kg the specific heat capacity of the liquid would be 1250 J kg/ K C° 50 J kg/ K C° 125 J kg/ K C° 5 J kg/ K C°
1) A geothermal facility operates at 1/3 of the Carnot efficiency. If the cold reservoirhas a temperature of 70°C, calculate and plot the efficiency of the facility as afunction of the geothermal fluid temperature from 100°C to 300°C. (remember toconvert to Kelvin!)1b) If a minimum efficiency of 5% is needed for this facility to be economicallyviable, what is the required minimum temperature of the geothermal fluid?
7
What is the payback time on a solar hot-water system that cost$ 5,000? Assume the system reduces electrical energy consumption by 4,000 kWhr each year and ilectricity costs 16 cents per kWhr. O 8 years O 4 years O 12 years O 15 years.
what id correct ans