As shown in the figure, electrical heaters operating in the V=220 V are placed on the lower surface of the square-shaped horizontal aluminum plate with a length and width of 1.2 m. Air at a temperature of 27 °C flows from the upper surface of the plate in parallel at 15 m/s. Since the bottom surface of the plate is fully insulated, what should the value of the current () passing through the electrical elements be so that the temperature of the plate does not exceed 77 °C? Air Al plate Heaters L=1.2 m

As shown in the figure, electrical heaters operating in the V=220 V are placed on the lower surface of the square-shaped horizontal aluminum plate with a length and width of 1.2 m. Air at a temperature of 27 °C flows from the upper surface of the plate in parallel at 15 m/s. Since the bottom surface of the plate is fully insulated, what should the value of the current () passing through the electrical elements be so that the temperature of the plate does not exceed 77 °C? Air Al plate Heaters L=1.2 m

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

There is a flow of air that circulates over a flat plate that is used to store a food product at a temperature of 95 ° C throughout its surface. The air flows at a speed of 2.5 m/s and has a temperature of 25.0°C. The plate measures 600.0 mm · 300.00 mm. As a task assigned by your plant operations manager, you are asked to answer the following questions: i. Determine the heat loss from the plate if the air flows parallel to the 600.00-mm side.ii. How would this heat loss be affected if the airflow is made parallel to the 300.0-mm side? For this type of configuration, the coefficient of heat transfer by forced convection, h, can be obtained from the relation IMAGE BELOW The previous correlation is valid for the laminar regime, that is: Re < 500000
A liquid is entering a 10 m long pipe of 0.2 m diameter at 25°C with an average velocity of 0.02 m/s. The pipe is kept at a constant surface temperature of 40°C. Assume the flow is both hydrodynamically and thermally fully-developed in the pipe. Find out the outlet temperature. Justify if the assumption of fully-developed flow is appropriate. The properties of the fluid can be assumed constant with following values Density: 484.2 kg/m³; Specific heat capacity: 2802 J/kg.K; Thermal conductivity: 0.0904 W/m.K; Dynamic viscosity: 9.197 × 10-5 kg/m.s; Prandtl number: 2.85. 29.3 °C
An oil gusher shoots crude oil 23.0 m into the air through a pipe with a 0.100 m diameter. Neglecting air resistance but not the resistance of the pipe, and assuming laminar flow, calculate the pressure (in N/m2) at the entrance of the 45.0 m long vertical pipe. Take the density of the oil to be 900 kg/m3 and its viscosity to be 1.00 (N/m2) · s (or 1.00 Pa · s). Note that you must take into account the pressure due to the 45.0 m column of oil in the pipe.
could you plz take a photo of the solution, the solution above isn't clear, the words are all put together so i can't quite get it.
A square duct having D=23-cm and surface temperature T=70°C is located horizontally in an attic space with ambient temperature T=11°C. If the duct is subjected to ait flow of U=1.4-m/s, find the Nusselt number for the external flow over the duct as shown in the figure below. U air T
Wind flows over a flat plate of length L = 25 mm and width W = 8 mm. The plate is maintained at a constant temperature of 32 °C on both sides. using an electric heater generating heat at a rate of Q = 0.5 W which is dissipated to air from both sides of the plate. Consider the temperature of the wind/air as 20 °C and assume that the wind speed does not exceed 100 m/s. The properties of air at this temperature are given as; specific heat capacity Cp = 1.005 kJ/kg-K, thermal conductivity k = 0.0253 W/m-K, Density p = 1.19 kg/m³, and kinematic viscosity v = 1.522 x 10 5 m²/s.
A 30mm ID, 50mm OD aluminum round tube passes air through it at a rate of 0.08 m^3/s. A 100W electric heater blanket covers the outside of the 2m long tube. If the air enters the tube at 100 celsius , what temperature does it exit at? Assume that the heater blanket is perfectly insulated on the back side (no heat loss out the back). Note-RT is 25 celsius
Water flow in steel pipe at a temperature of 50o C as shown in the figure. The pipe is wrapped with thermal isolation. Air is flowing over the pipe at a temperature of -5o C and a speed of 3 m/sec. It is known that 1kWh costs 0.05$ Find the daily cost of the heat losses per meter without the pipe isolation? What is the daily cost saving when using the isolation?
Air at 20°C is hydrodynamically fully developed as it flows in a 1 cm I.D. pipe. The average velocity is 0.7 m/s. If it enters a section where the pipe wall is at 60°C, what is the temperature 0.25 m farther down stream?
A square duct having D=17-cm and surface temperature T=66°C is located horizontally in an attic space with ambient temperature T=14°C. If the duct is subjected to ait flow of U=1.0-m/s, find the Nusselt number for the external flow over the duct as shown in the figure below. U air T,