Engineering assignment
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1. Using NFPA 17 and Ansul Criteria provided in the PPT, design a system for an area 25 ft. wide, 20ft. long, and 12 feet high, with 210 square feet of un-enclosable area. You must address and show your work for determining the volume of the hazards (5pts), interior surface area (5pts), percentage of un-enclosable area (5pts), minimum amount of dry agent required (5pts), minimum amount to cover un-enclosable area (5pts), total amount of agent required (5pts) and the minimum number of nozzles (5pts).
2. A valuable painting is in a display case 5 ft. wide, 6 ft. long, and 5 ft. tall, elevated 1 ft. above a solid floor. The case is centered in a 10 ft. long by 10 ft. wide enclosure with 8 ft. high walls on all sides. Use the rate-by-volume method of local application to calculate flow rate and the total amount of carbon dioxide required, assuming a discharge time of 30 seconds.

3. The case in problem 1 has been moved to a very large room with no walls near the case, and with the case mounted directly to the floor. Use the rate-by-volume method of local application to calculate flow rate and total amount of carbon dioxide required, assuming a discharge time 45 seconds.

4. Use the rate-by-area method to determine the minimum amount of carbon dioxide required to protect a diptank 45 ft. long and 5 ft. wide, and a dranboard 10 ft. long and 5 ft. wide, using a discharge time of 30 seconds.

5. Determine the minimum total flooding design quantity of Carbon Dioxide agent required for a room containing Acetylene that is 15 ft. long, 15 ft. wide, and 12 ft. in height. The structure has a 5 sq. ft. opening whose center is 5 ft. below the ceiling of the enclosure. The temperature for the enclosure is 210oF

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Engineering economics case study
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Case Description
Paul and Leslie Smithson are buying a new house. They have saved for several years to
accumulate a down payment and have now found a house that is just perfect for their
needs. It is a beautiful three bedroom Tudor house in a quiet neighborhood in the
suburbs. With the help of their real estate agent and after several rounds of offering and
counter-offering, they have agreed on a price of $103,000 with the sellers. The only thing
that remains to make their new home a reality is to select a mortgage. Paul and Leslie are
unsure about the details of making this type of decision and have come to you for
guidance because of your expertise in this area.

Paul and Leslie are both 30 years old and professionally employed. They earn generous
salaries and fall into the 28% effective tax bracket on their personal income taxes. They
dream long term of retiring at the age of 65 so they can travel the country to take in all its
scenic beauty. It is this dream that drives them to determine a mortgage arrangement that
allows them to generate the maximum retirement account balance that they can create to
supplement their company sponsored retirement plans. They currently have
accumulated $10,000 to use for the down payment and closing costs on their house. Any
excess amount not used in this way could be used as an initial deposit in their retirement
savings account. Alternatively, any excess could be used to make a down payment in
excess of the minimum requirement. After studying their budget and spending patterns
they have determined that they can afford $1,000/month to cover both mortgage
payments and personal retirement savings. They are strongly committed to their
retirement travel plans, so any of the $1,000 not spent on the mortgage will be invested in
the retirement savings account. In addition, any tax savings generated through the
mortgage will be deposited in the retirement account. Although they anticipate salary
increases over the years until they retire, the impact of inflation and changes in lifestyle
will offset these to the extent that the $1,000 per month can be considered constant over
the next 35 years.

They have selected a retirement savings vehicle which involves investment in a tax
sheltered mutual fund which pays an average of 9% per year compounded monthly. Paul
and Leslie, with the help of an investment banker, have studied the history of this fund
and are comfortable that the 9%/yr/mo average return over their 35 year retirement
savings horizon is reasonable. Undoubtedly their will be ups and downs but the long
term average of 9% appears to be reasonable and stable for planning purposes. Since this
is a tax sheltered account, all investments will grow tax free until their retirement.
Paul and Leslie have identified four potential mortgage options. They will make their
selection from among these four based on your recommendation.
Available Mortgage
15 year fixed rate @ 6.63%/year/2-weeks, bi-weekly payments, minimum 5% down
payment, 1 point closing costs
The mortgage has two options (must solve for both options):
1. Going with minimum down payment and getting more loan, but depositing the remaining of the $10,000 the Smithson’s accumulated in the beginning to the retirement account in time zero.
2. Using the whole $10,000 towards down payment and 1% closing cost and get lower amount of loan, but not having anything to deposit in the beginning (time zero) in the retirement account.

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Electrical Engineering&Matlab(Laplace Equation)
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the questions and graph is at the end of the pdf file. others are instructions.

Consider the rectangular domain as shown with the applied voltage on the
boundary:

• Write a Matlab code to find the electric potential V (x, y) and the
electric field E(x, y) at all grid points in the domain.
• Draw equipotential lines in the domain.
• Draw contour plot of constant field intensity.
• How much energy is stored in this device?
• Could this device be considered as a capacitor? If so, find its
capacitance.
• Disucss anything else about this problem that you find interesting or
important.

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Three engineers who worked for Mitchell Engineering
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Three engineers who worked for Mitchell Engineering, a company specializing in public housing development, went to lunch together several times a week. Over time they decided to work on solar energy production ideas. After a lot of weekend time over several years, they had designed and developed a prototype of a low-cost, scalable solar energy plant for use in multifamily dwellings on the low end and medium sized manufacturing facilities on the upper end. For residential applications, the collector could be mounted along side a TV dish and be programmed to track the sun. The generator and additional equipment are installed in a closet-sized area in an apartment or on a floor for multiple-apartment supply. The system serves as a supplement to the electricity provided by the local power company. After some 6 months of testing, it was agreed that the system was ready to market and reliably state that an electricity bill in high-rises could be reduced by approximately 40% per month. This was great news for low-income dwellers on government subsidy that are required to pay their own utility bills. With a hefty bank loan and $200,000 of their own capital, they were able to install demonstration sites in three cities in the sunbelt. Net cash flow after all expenses, loan repayment, and taxes for the first 4 years was acceptable; $55,000 at the end of the first year, increasing by 5% each year thereafter. A business acquaintance introduced them to a potential buyer of the patent rights and current subscriber base with an estimated $500,000 net cash-out after only these 4 years of ownership. However, after serious discussion replaced the initial excitement of the sales offer, the trio decided to not sell at this time. They wanted to stay in the business for a while longer to develop some enhancement ideas and to see how much revenue may increase over the next few years.
During the next year, the fifth year of the partnership, the engineer who had received the patents upon which the collector and generator designs were based became very displeased with the partnering arrangements and left the trio to go into partnership with an international firm in the energy business. With new research and development funds and the patent rights, a competing design was soon on the market and took much of the business away from the original two developers. Net cash flow dropped to $40,000 in year 5 and continued to decrease by $5000 per year. Another offer to sell in year 8 was presented, but it was only for $100,000 net cash. This was considered too much of a loss, so the two owners did not accept. Instead, they decided to put $200,000 more of their own savings into the company to develop additional applications in the housing market. It is now 12 years since the system was publicly launched. With increased advertising and development, net cash flow has been positive the last 4 years, starting at $5000 in year 9 and increasing by $5000 each year until now.

It is now 12 years after the products were developed, and the engineers invested most of their savings in an innovative idea. However, the question of “When do we sell?” is always present in these situations. To help with the analysis, determine the following:
1. The rate of return at the end of year 4 for two situations:
(a) The business is sold for the net cash amount of $500,000
(b) No sale.
2. The rate of return at the end of year 8 for two situations:
(a) The business is sold for the net cash amount of $100,000
(b) No sale.
3. The rate of return now at the end of year 12.
4. Consider the cash flow series over the 12 years. Is there any indication that multiple rates of return may be present? If so, use the spreadsheet already developed to search for ROR values in the range 100% other than the one determined in exercise 3 above.
5. Assume you are an investor with a large amount of ready cash, looking for an innovative solar energy product.
What amount would you be willing to offer for the business at this point (end of year 12) if you require a 12% per year return on all your investments and, if purchased, you plan to own the business for 12 additional years? To help make the decision, assume the current NCF series continues increasing at $5000 per year for the years you would own it. Explain your logic for offering this amount.

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