This answer on chegg please take a hints and solve but don't copy and paste chegg answers I need your handwriting Consider a 23-cm x 28-cm printed circuit board(PCB) that has electroniccomponents on one side.The board is placed in aroom at 20°C. The heatloss from the backsurface of the board isnegligible. Assume thatthe circuit boarddissipates 8 W of powerin steady operation. Takethe emissivity of thesurface of the board tobe 0.8 and assume thesurrounding surfaces tobe at the sametemperature as the air inthe room. Evaluate airproperties at a filmtemperature of 32.5°Cand 1 atm pressure.Given: The properties ofair at 1 atm and 32.5°C.k = 0.02067W/m.°Cv = 1.631 x 10-5 m2/sPr 0.7275,B = 0.003273 K-1Determine the average temperature ofthe hot surface of the board, assumingthe board is horizontal with hot surfacefacing up.°C

Given: PCB of 23 cm x 28 cm Board is horizontal, and hot surface facing up T∞=20°CHeat dissipated,…

Answered: Determine the average temperature of…

Determine the average temperature of the hot surface of the board, assuming the board is horizontal with hot surface facing up.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter11: Heat Transfer By Radiation

Section: Chapter Questions

Problem 11.56P

See similar textbooks

Related questions

Q: emissivity of 0.85. Determine the net rate of radiation heat transfers between the two surfaces, and…

A: 1. Steady operating conditions exist 2. The surfaces are opaque, diffuse, and gray 3. Convection…

Q: Q2/A vertical cylinder having a length of 30 cm is maintained at 100-C and exposed to room air at…

Q: The ratio of the mass of actual dry steam to the mass of same qantity of wet steam is called *…

Q: Task mechanical engineering Water is boiling in a 12-cm-deep pan with an outer di ameter of 25 cm…

A: The Answer is below

Q: A 2.5-m-tall steel cylinder has a cross-sectional area of 1.5 m². At the bottom, with a height of…

A: Height of water, hw=0.5m Height of oil, ho=1m Height of container, h=2.5m Atmospheric air pressure,…

Q: Checked whether the lumped system analysis is suitable OIf it is suitable, determine the temperature…

A: Problem 1 (HW 6) Given: Diameter of the sphere (D) =10 cm=0.1 m ρ=8954kg/m3c=383…

Q: determine the thermal resistance of three concentric cylinders of radious r1, r2, r3

Q: Determine the shape factor between the floor and the 45 over a long corridor. The width is 2 Im and…

Q: Discuss the difference between static and dynamic temperatures.

A: difference between static and dynamic temperature

Q: Why does the shape of the passenger cabin windows on modern airplanes are rounded or elliptical? Why…

A: Given question: Why does the shape of the passenger cabin windows on modern airplanes are rounded or…

Q: The hot water coming out of a hydrothermal vent is sometimes called vent fluid. Why would you and I…

A: The hydrothermal vents found in the ocean where the volcanic activity takes place it is the natural…

Q: what is the outer surface wall temperature

A: Given Heat transfer rate, Q = 69.25 W Outdoor temperature, T4 = -10oC Thermal…

Q: The upper and lower compartments of a well-insulated container are separated by two parallel sheets…

A: In this case, there are two compartments, one is upper and another is lower. One compartment has hot…

Q: What are the three modes of heat transfer? Describe each briefly.

A: There are three modes of heat transfer namely as follows; 1- Conduction, 2- Convection and 3-…

Q: Explain the wet bulb and dew point temperatures. Show how they are determined on the cycrometric…

A: Wet bulb temperature The temperature of adiabatic saturation is known as adiabatic saturation.…

Q: Explain how the fins enhance heat transfer from a surface. Also, explain how the addition of fins…

A: Basic convection equation is given by

Q: A cyclic process consists of two isothermal and two isobaric processes. Calculate the net work done…

A: Given Data⇒Cyclic ProcessesTwo isobaric processesTwo isothermal procesesProblem defintion⇒Problem…

Q: 3. Compute for the Nusselt value of a natural convection in a small holding tank with a heating…

Q: Question Consider heat loss through the two walls of a house on a winter night. The walls are…

A: Given that onle wall has a glass window and other wall does not have any window.

Q: Show that the plate is lumped, and then find the time required for the plate to achieve a…

Q: A spherical block of dry ice at -79°C is exposed to atmospheric air at 30°C. The general direction…

A: The direction is explained with the concept of natural convection

Q: A 3-meter high room is heated through a vertical steam pipe. If the bulk temperature of steam in the…

A: Given data: *The height of the room is h=3 m. *The bulk temperature of the steam is Tb=25 degrees…

Q: Question 1: -Explain the effect of the air velocity on the heat transfer by convection. -Explain the…

A: given; (a) explain the effect of the air velocity on the heat transfer by convection. (b) explain…

Q: What must be the Height of a 200mm diameter vertical pipe carrying hot liquid so that the…

A: Given:Diameter of the vertical pipe, d=200 mm or 0.2 mSurrounding area, Ts=38o CRate of convection…

Q: Consider a person standing in a breezy room at 24C. Determine the total rate of heat transfer from…

Q: Question # 3: Water is boiling in a 12-cm-deep pan with an outer diameter of 25 cm that is placed on…

Q: Explain why an absolute temperature is defined and give its SI units.

A: Given Data : Absolute temperature SI Unit

Q: The interior-wall temperature of an annealing oven constructed of firebrick (Missouri) is 2552°F,…

Q: Explain why heat loss from a cooking pan is reduced by fitting it with a lid. The lid prevents hot…

A: Heat loss from the cooking pan without lid occurs by convection and evaporation. 1. Heat lost by…

Q: QUESTION 4. Question 4.1 Consider two fluids, one with a large coefficient of volume expansion and…

A: Heat transfer can take place in three different modes namely conduction, convection and radiation.…

Q: 1. The boiling temperature of water is 100 °C. If you put boiling water in a mug placed at the table…

A: As per our guidelines, experts can provide solution to only one problem in case of multiple…

Q: A can of engine oil with a length of 150 mm and a diameter of 100 mm is placed vertically in the…

A: The data given is, Length of the can of engine oil, L = 150 mm = 0.150 m Diameter of the can of…

Q: A. Check whether the lumped system analysis is suitable. B. Determine the temperature of the copper…

A: For solution refer below images.

Q: surface temperature (in K) of the rod is

A: Given; A cylindrical uranium fuel rod; radius=5 mm heat genration rate =4×107W/m3 Heat transfer…

Q: Why do vapor bubbles get larger in boiling water as they approach the surface? Type your detailed…

Q: What is smog? What does it consist of?

A: smog= smoke +fog It reduce the visibility It occurs when sunlight reacts with nitrogen oxides and…

Q: Do they equal the limits of resistance (ou, oy) in the tensile and compressive tests of ductile…

Q: what is a simple closed surface that consists of four or more planes?

A: Simple Closed Surface : A simple closed surface is defined as a surface with exactly one interior,…

Q: Determine the total pressure and centre of pressure on an isosceles triangular plate of base 650 cm…

Q: For which solid is the lumped system analysis more likely to be applicable: an actual apple or a…

A: Lumped heat capacity depends on the biot number. Biot number=hVKSwhere,V=volume of…

Concept explainers

Layout

The layout is a way of organizing the elements, products, and raw materials in a design. The layout is the representation of information in a structural, logical, descriptive, coherent form.The layout is a mapping of various equipment arrangements, workstations, machinery, plants, and more. It secures the continuous movement of a product quantity along with the quality.

Question

This answer on chegg please take a hints and solve but don't copy and paste chegg answers I need your handwriting

Consider a 23-cm x 28-
cm printed circuit board
(PCB) that has electronic
components on one side.
The board is placed in a
room at 20°C. The heat
loss from the back
surface of the board is
negligible. Assume that
the circuit board
dissipates 8 W of power
in steady operation. Take
the emissivity of the
surface of the board to
be 0.8 and assume the
surrounding surfaces to
be at the same
temperature as the air in
the room. Evaluate air
properties at a film
temperature of 32.5°C
and 1 atm pressure.
Given: The properties of
air at 1 atm and 32.5°C.
k = 0.02067W/m.°C
v = 1.631 x 10-5 m2/s
Pr 0.7275,
B = 0.003273 K-1
Determine the average temperature of
the hot surface of the board, assuming
the board is horizontal with hot surface
facing up.
°C

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

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 50cm by 100 cm stainless steel plate with emissivity of 0.85 is maintained at 500°C. determine the heat produced by the plate in 30 minutes, and the power it dissipates
A 50-cm * 50-cm circuit board that contains 121 square chips on one side is to be cooled by combined natural convection and radiation by mounting it on a vertical surface in a room at 25°C. Each chip dissipates 0.18 W of power, and the emissivity of the chip surfaces is 0.7. Assuming the heat transfer from the back side of the circuit board to be negligible, and the temperature of the surrounding surfaces to be the same as the air temperature of the room, determine the surface temperature of the chips. Evaluate air properties at a film temperature of 30°C and 1 atm pressure. Is this a good assumption?
Consider a sealed 20-cm-high electronic box whose base dimensions are 40 cm x 40 cm placed in a vacuum chamber. The emissivity of the outer surface of the box is 0.95. If the electronic components in the box dissipate a total of 100 W of power and the outer surface temperature of the box is not to exceed 55°C, determine the temperature at which the surrounding surfaces must be kept if this box is to be cooled by radiation alone. Assume the heat transfer from the bottom surface of the box to the stand to be negligible.
A 3 m2 hot black surface at 80 C is losing heat to the surrounding air at 25 C by convection with a convection heat coefficient of 12 W/m2.C and by radiation to the surrounding surfaces at 15 C. Calculate the total rate of heat loss from the surface in watts.
Consider steady heat transfer between two large parallel plates at constant temperatures T1 = 300 K and T2 = 200 K that are L = 1 cm apart, as shown below. Assuming the surface to be black, determine the rate of heat transfer between the plates per unit surface area assuming the gap between the plates is free flowing air with h = 7.5 W/m2oC
Consider a 15-cm * 20-cm printed circuit board (PCB) that has electronic components on one side. The board is placed in a room at 20°C. The heat loss from the back surface of the board is negligible. If the circuit board is dissipating 8 W of power in steady operation, determine the average temperature of the hot surface of the board, assuming the board is (a) vertical, (b) horizontal with hot surface facing up, and (c) horizontal with hot surface facing down. Take the emissivity of the surface of the board to be 0.8 and assume the surrounding surfaces to be at the same temperature as the air in the room. Evaluate air properties at a film temperature of 32.5°C and 1 atm pressure. Is this a good assumption?
Consider a sealed 20-cm-high electronic box whose base dimensions are 40 cm × 40 cm placed in a vacuum chamber. The emissivity of the outer surface of the box is 0.95. If the electronic components in the box dissipate a total of 100 W of power and the outer surface temperature of the box is not to exceed 55 °C, determine the (maximum) temperature (in °C) at which the surrounding surfaces must be kept if this box is to be cooled by radiation alone. Assume the heat transfer from the bottom surface of the box to the stand to be negligible. Round your answer to 2 decimal places.
as a researcher in the field of heat transfer explain how you will distinguish between radiation by black body and a real body
Consider a room whose door and windows are tightly closed, and whose walls are well-insulated so that heat loss or gain through the walls is negligible.
Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 0.0023-m-thick layers of glass (k = 0.78 W/m·K) separated by a 12-mm-wide vacuum space. Take the convection heat transfer coefficients on the inner and outer surfaces of the window to be h1 = 10 W/m2·K and h2 = 25 W/m2·K, and disregard any heat transfer by radiation. Assume that the space between the two glass layers is evacuated.Determine the steady rate of heat transfer (in W) through the glass window. The room is maintained at 24°C while the temperature of the outdoors is –5°C. (Radiation in outer side of the double-pane window should be disregarded but in the inner part, the only mechanism of heat transfer in vacuum is by radiation. Emissivity for glass is around 1, and the temperature of inner surfaces of the double-pane window should be assumed to be 5 and 15 'C.)
Determine the net heat transferred by radiation from a 9-ft square hot plate to a cold plate of equal size that are parallel to one another, and 20 ft apart if the hot plate is oxidized steel at 700°F and the cold plate is dull brass at 175°F.Ans: 2,863 Btu/hr
A 1000-W iron is left on the ironing board with its base exposed to the air at 23°C. The convection heat transfer coefficient between the base surface and the surrounding air is 20 W/m2 ·°C. If the base has an emissivity of 0.4 and a surface area of 0.02 m2 , determine the temperature of the base of the iron.