A vertical array of circuit boards of 150-mm height is to be air cooled such that the
Question:
A vertical array of circuit boards of 150-mm height is to be air cooled such that the board temperature does not exceed 60°C when the ambient temperature is 25°C.
Assuming isothermal surface conditions, determine the allowable electrical power dissipation per board for the cooling arrangements:
(a) Free convection only (no forced airflow).
(b) Airflow with a downward velocity of 0.6 m/s.
(c) Airflow with an upward velocity of 0.3 m/s.
(d) Airflow with a velocity (upward or downward) of 5 m/s.
Transcribed Image Text:
Air flow, (b) (c) 150 mm T, Board Quiescent air, T. (a)
Fantastic news! We've Found the answer you've been seeking!
Step by Step Answer:
Answer rating: 60% (15 reviews)
KNOWN Vertical array of circuit boards 015m high with maximum allowable uniform surface temperature for prescribed ambient air temperature FIND Allowable electrical power dissipation per board qWm for ...View the full answer
Answered By
Tobias sifuna
I am an individual who possesses a unique set of skills and qualities that make me well-suited for content and academic writing. I have a strong writing ability, allowing me to communicate ideas and arguments in a clear, concise, and effective manner. My writing is backed by extensive research skills, enabling me to gather information from credible sources to support my arguments. I also have critical thinking skills, which allow me to analyze information, draw informed conclusions, and present my arguments in a logical and convincing manner. Additionally, I have an eye for detail and the ability to carefully proofread my work, ensuring that it is free of errors and that all sources are properly cited. Time management skills are another key strength that allow me to meet deadlines and prioritize tasks effectively. Communication skills, including the ability to collaborate with others, including editors, peer reviewers, and subject matter experts, are also important qualities that I have. I am also adaptable, capable of writing on a variety of topics and adjusting my writing style and tone to meet the needs of different audiences and projects. Lastly, I am driven by a passion for writing, which continually drives me to improve my skills and produce high-quality work.
5.00+
1+ Reviews
10+ Question Solved
Related Book For
Fundamentals of Heat and Mass Transfer
ISBN: 978-0471457282
6th Edition
Authors: Incropera, Dewitt, Bergman, Lavine
Question Posted:
Students also viewed these Mechanical Engineering questions
-
A vertical array of circuit boards is immersed in quiescent ambient air at T = 17C. Although the components protrude from their substrates, it is reasonable, as a first approximation, to assume flat...
-
A 0.15 m square circuit board is to be cooled in a vertical position as shown. The board is insulated on one side while on the other, 100 closely spaced square chips are mounted, each of which...
-
Does sound tend to bend upward or downward when its speed is less near the ground?
-
Evaluate triple integrate (x^2+y^2+z^2)dx dy dz where R denotes the region bounded by x = 0, y = 0, z = 0 and x + y + z = a, (a > 0)
-
Each of the following employees works as a staff accountant at a regional tax return preparation firm. Which of the following employees likely can be legally terminated from work without notice? a. A...
-
Compare and contrast attributes that are most and least important to a project manager when building a team. Provide a work or project example to support your answer. Back up your answer with...
-
Juliana is considering an investment proposal with the following cash flows: Required a. Determine the payback period b. Determine the accounting rate of return on initial investment c. Determine the...
-
Usury laws place a ceiling on interest rates that lenders such as banks can charge borrowers. Why would we expect low-income households in states with usury laws to have significantly lower levels of...
-
In the figure below, O is the center of the circle. Name a secant of the circle. D A E F 0 6 G B H H K A. FG B. AO C. HK OD. AB
-
Given the following yield information on municipal bonds issued by the state of Nebraska: 1-year note yield = 2.35% 2-year note yield = 2.75% 3-year note yield = 3.29% 4-year note yield = 3.95%...
-
According to experimental results for parallel airflow over a uniform temperature, heated vertical plate, the effect of free convection on the heat transfer convection coefficient will be 5% when...
-
A horizontal l00-mm-diameter pipe passing hot oil is to be used in the design of an industrial water heater. Based on a typical water draw rate, the velocity over the pipe is 0.5 m/s. The hot oil...
-
The input-output equation characterizing a system of input x(t) and output y(t) is and zero otherwise. (a) Find the ordinary differential equation that also characterizes this system. (b) Suppose...
-
What is the IRR of an investment of \($1,000\) that yields cash flows of \($600\) in each of the first two years?
-
Your grandfather put $1,000 in the bank for you 48 years ago. The bank paid 6 percent interest compounded annually during this time period. How much is your grandfathers deposit worth today?
-
What does redundant hardware mean? Is this an unnecessary cost to a business?
-
What is the break-even price when a company expects to sell 5,000 units, the fixed costs are \($50,000,\) and the variable costs are \($30\) per unit?
-
Alpha makes a product with a fixed cost of \($400,000\) and a variable cost of \($100\) per unit. The sales price is \($200\) per unit. What is the break-even point for the product? How many units...
-
The percentage of workers in the public sector that are unionized is far _________ than average in the economy.
-
Is that Yelp review real or fake? The article A Framework for Fake Review Detection in Online Consumer Electronics Retailers (Information Processing and Management 2019: 12341244) tested five...
-
In a single panelboard, what is the maximum number of overcurrent protection devices that may be used for protecting lighting/appliance branch circuits?
-
A mixing chamber with heat transfer receives 2 kg/s of R-22 at 1 MPa, 40C in one line and 1 kg/s of R-22 at 30C, quality 50% in a line with a valve. The outgoing flow is at 1 MPa, 60C. Find the rate...
-
Two flows are mixed to form a single flow. Flow at state 1 is 1.5 kg/s water at 400 kPa, 200oC and flow at state 2 is 500 kPa, 100oC. Which mass flow rate at state 2 will produce an exit T3 = 150oC...
-
An insulated mixing chamber receives 2 kg/s R-134a at 1 MPa, 100C in a line with low velocity. Another line with R-134a as saturated liquid 60C flows through a valve to the mixing chamber at 1 MPa...
-
Required information Research Case 10-2 (Static) FASB codification; locate and extract relevant information and cite authoritative support for a financial reporting issue; restoration costs; asset...
-
Assets Cash Bowers Corporation Comparative Balance Sheets December 31, 20x2 and 20x1 ($ in thousands) Accounts receivable Short-term investment Inventory Land Buildings and equipment Less:...
-
Dwight Donovan, the president of Franklin Enterprises, is considering two investment opportunities. Because of limited resources, he will be able to invest in only one of them. Project A is to...
Study smarter with the SolutionInn App