Three electric resistance heaters of length L = 250 mm and diameter D = 25 mm are submerged in a 10-gal tank of water, which is initially at 295 K. The water may be assumed to have a density and specific heat of p = 990 kg/m³ and c = 4180 J/kg K. (a) If the heaters are activated, each dissipating 91 500 W, estimate the time required to bring the water to a temperature of 335 K. = (b) If the natural convection coefficient is given by an expression of the form h = 370 (T, - T)¹/³, where T, and T are temperatures of the heater surface and water, respectively, what is the temperature of each heater shortly after activation and just before deactivation? Units of h and (T, - T) are W/m² · K and K, respectively. (c) If the heaters are inadvertently activated when the tank is empty, the natural convection coefficient associated with heat transfer to the ambient air at T = 300 K may be approximated as h = 0.70 (T. -T.)¹/3. If the temperature of the tank walls is also 300 K and the emissivity of the heater surface is & = 0.85, what is the surface temperature of each heater under steady-state conditions?

Three electric resistance heaters of length L = 250 mm and diameter D = 25 mm are submerged in a 10-gal tank of water, which is initially at 295 K. The water may be assumed to have a density and specific heat of p = 990 kg/m³ and c = 4180 J/kg K. (a) If the heaters are activated, each dissipating 91 500 W, estimate the time required to bring the water to a temperature of 335 K. = (b) If the natural convection coefficient is given by an expression of the form h = 370 (T, - T)¹/³, where T, and T are temperatures of the heater surface and water, respectively, what is the temperature of each heater shortly after activation and just before deactivation? Units of h and (T, - T) are W/m² · K and K, respectively. (c) If the heaters are inadvertently activated when the tank is empty, the natural convection coefficient associated with heat transfer to the ambient air at T = 300 K may be approximated as h = 0.70 (T. -T.)¹/3. If the temperature of the tank walls is also 300 K and the emissivity of the heater surface is & = 0.85, what is the surface temperature of each heater under steady-state conditions?

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

I need answer within 20 minutes please please with my best wishes
Project 7: In this project you were assigned to explore your mechanical design and system capabilities. Your manger asked you to prepare a technical research report to evaluate the effects of misalignment of shafts and the measures that are taken to prevent problems from occurring. The hiring committee asked you to deliver a short report showing your evaluation (no more than 600 words).
Define the concept of mechanic of materials ?
An automobile tire can be critically statically balanced since it has an dimension. on
The tyre of a parked car in a parking lot experiences Select one: O Siding Friction O Rolling Friction Both static and dynamic friction O Static Friction
i need the answer quickly
Root cause analysis (RCA) is a problem solving technique to find the actual cause of the problems which usually lie underneath the visible symptoms. It requires thorough analysis steps and investigation to find the actual cause. 5 WHY analysis is one of the commonly use RCA technique. Complete the Table 2 using given possible causes listed below in correct sequences. Problem: The machine at the production suddenly stopped The circuit was overloaded, causing the fuse to blow. Bearing locked up because insufficient Jubrication 2 WHY the circuit overloaded? 3 WHY was the insufficient lubricant? 5 WHY is the pump clogged with metal? The pump strainer was broken. Solution : WHY the machine stopped? Hire new technician WHY the pump circulate oils? WHY technician did not perform inspection? Pump in good condition Replace a new strainer with correct size. WHY the pump circulate less oil? Pump clogged with metal shaving. Pump not circulating enough oil WHY the operator stopped the machine? New…
I need ans within 8 minutes with draw happy emoji in the end my best wishes ton
Solution 1: Ergonomic Assessment and Improvement. An ergonomic assessment of Paula's workstation could identify areas where adjustments could be made to reduce strain on her wrists. This could include adjusting the height of the workstation, providing wrist supports, or changing the design of the tools she uses. The strength of this solution is that it directly addresses the physical strain causing Paula's discomfort. However, the weakness is that it may require investment in new equipment or tools, and the effectiveness will depend on the specific changes made. Solution 2: Job Rotation. Paula could be rotated between different tasks more frequently, reducing the amount of time she spends on tasks that strain her wrists. This could also include training other workers to perform the welding and gaging operations, allowing for more flexibility in task assignments. The strength of this solution is that it reduces the repetitive strain on Paula's wrists. The weakness is that it requires…
What are crumple zones in cars designed for? O absorbing the shock from bumpy roads changing the direction of the car during impact increasing the time it takes for a car to stop during a crash allowing the car to be scrapped and recycled easily
Direction: In about 300 words, write a part-by-part description of a Valco baby stroller. Include at least FIVE parts in the descriptions using the information provided in the table below. Hand brake Handlebar Canopy Cup holder & Storage compartments Jeep Cup/food holder Reclining Seat Tray Table Lap belt Cargo/storage space Foot rest Wheels Parts Descriptions • provides a convenient mounting place for controlling covered in leather shape location Handlebar the stroller • stainless steel holds a cup, other drinking vessel, or food items • plastic 2.25 inches * 5.75 inches Cup/food holders shape color slows the stroller down to an smooth easier pace color Hand brake plastic location semicircular protects babies from sunlight, wind, rain, and snow. stitched to the reclining seat color Canopy location • reduces the amount of shocks to the child's body not more than 14.5 kg polyester linear Reclining seat location stores baby's diaper bags and towels, and helps parents carry some of baby's…
Tire manufacturers recommend that you check your tire pressure monthly to avoid unnecessary tire wear and enhance safety. This is best done when the tires are cold meaning; the car has not been driven for at least 2 hours. Since you leave for work before the sun comes up you decide to inflate your tires to the recommended pressure right after you get home from work in the afternoon when the tires are still warm. What would you find if you rechecked your tire pressure after the tires have cooled down? A.Tire pressure has decreased because there is a decrease in kinetic energy of themolecules resulting in more collisions with the inside walls of the tire thusincreasing the pressure inside the tire. B.Tire pressure has increased because there is a decrease in kinetic energy of the molecules resulting in fewer collisions with the inside walls of the tire thus decreasing the pressure inside the tire. C.Tire pressure has increased because there is an increase in kinetic energy of the…