Radiation exchange with the ground

Assignment Help Mechanical Engineering
Reference no: EM13947603

1. Consider the transmission case of Problem 1.23, but now allow for radiation exchange with the ground/ chassis, which may be approximated as large surround- ings at Tsur = 30°C. If the emissivity of the case is = 0.80, what is the surface temperature?

2. One method for growing thin silicon sheets for photo- voltaic solar panels is to pass two thin strings of high melting temperature material upward through a bath of molten silicon. The silicon solidifies on the strings near the surface of the molten pool, and the solid silicon sheet is pulled slowly upward out of the pool. The silicon is replenished by supplying the molten pool with solid sili- con powder. Consider a silicon sheet that is Wsi = 85 mm

(a) Determine the electric power, Pelec, needed to oper- ate the system at steady state.

(b) If the photovoltaic panel absorbs a time-averaged solar flux of q"sol = 180 W/m2 and the panel has a conversion efficiency (the ratio of solar power absorbed to electric power produced) of 77 = 0.20, how long must the solar panel be operated to pro- duce enough electric energy to offset the electric energy that was consumed in its manufacture?

Reference no: EM13947603

Questions Cloud

Compute expected return given these three economic states : Refer to the table below to complete this question. "Compute the expected return given these three economic states, their likelihoods, and the potential returns Economic State Probability Return Fast Growth 0.30 40% Slow Growth 0.40 10% Recession 0.3..
Just-in-time inventory management system : The efficiency gains resulting from a just-in-time inventory management system will allow a firm to reduce its level of inventories permanently by $379,000. What is the most the firm should be willing to pay for installing the system?
Describe ways to increase your site''s search engine rank : What are the differences between the various graphic formats? Give an example of when you would use each.
Expected return of your portfolio : You have $69000, you put 18% of your money in a stock with an expected return of 12%, $40000 in a stock with an expected return of 17%, and the rest in a stock with an expected return of 18%. What is the expected return of your portfolio?
Radiation exchange with the ground : 1. Consider the transmission case of Problem 1.23, but now allow for radiation exchange with the ground/ chassis, which may be approximated as large surround- ings at Tsur = 30°C. If the emissivity of the case is s = 0.80, what is the surface tempe..
Provide both qualitative and quantitative reasoning in memo : Prepare a memo to the president that details your analysis and reasoning and recommends one of the two alternatives. Provide both qualitative and quantitative reasoning in the memo.
Target capital structure calls debt and common equity : For a company whose target capital structure calls for 50% debt and 50% common equity, which of the following statements is CORRECT? The interest rate used to calculate the WACC is the average after-tax cost of all the company’s outstanding debt as s..
Why do we have both debug and release builds : When two or more functions have the same name, how does the compiler determine which one to use for a particular function call?
Stocks dividend is expected to grow at constant rate : If a stock’s dividend is expected to grow at a constant rate of 5% a year, which of the following statements is CORRECT? The stock is in equilibrium.

Reviews

Write a Review

Mechanical Engineering Questions & Answers

  Package design

Package Design Brief: Assume you are the packaging engineer for a large consumer products company. In this company, the Packaging Design Briefs are initiated by the marketing group and forwarded to the Package Engineering group.

  Mechanical engineering questions

Define dynamic viscosity, Determine the centroid, Pressure due to the height of liquid, Advantage of changing the liquid, Calculate the total moment about the hinge of the seal gate.

  Automatic control

DOF system and Find the differential equation describing the system

  Write a paper on boyle''s law

Write a paper on Boyle's law and describe Compression and Combustion stroke . Also explain Charles's law and illustrate SI engine and CI engine.

  Verify the law for parallelogram of forces

To Verify the law for parallelogram of forces, law for triangle of forces and law of polygon of forces. These laws are very useful to calculate unknown forces in very short time.

  Discharge pressure of the compressor

What is the discharge revised discharge pressure of the compressor.

  The Case for Global Accounting Standards

The role of IFRS in both developing and developed capital markets.

  Wind turbine

Wind turbines are becoming more and more common as a method of energy production, wind turbines by their very nature are dynamic and are subject to and create their own internal and external kinematics and kinetics.

  Advanced design methodologies

8 x product engineering and design review (week 2 – 12), ~3 pages per item which must contain a brief description of the product then delve into concepts such as materials selection, manufacturing methods, life cycle analysis, recyclability and overa..

  Design of absorption column and the cooler

Design of absorption column and the cooler. Process design of other units should be completed along with pipe sizes.

  Determine the maximum total bending moment

Determine maximum total bending moment (static plus dynamic) of the beam under steady-state conditions.

  Force of the water on the gate

Determine the magnitude of the horizontal and vertical components of the force of the water on the gate.

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd