I am working with eoncmic engineering please see the requirements attached for this project.
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MET/IEM 4953/5953 – Casework 8 – Electric Motors
Project work: By individuals
Assignment value: 100 points maximum possible
Background reading to support this assignment:
1) Any link that the instructor emails to you.
2) All files listed in Module 19 of CANVAS.
3) The assigned textbook, Chapter 12, pages 414 to 424.
You are the plant engineer at a poultry production facility, where thousands of chickens are grown to maturity and then processed for Tyson all year. The birds are fed and housed in a high concentration, so outside ventilation is required to maintain air quality, reduce disease transmission among the animals, and control temperature.
The ventilation is provided by one fan operated by one 25-horsepower 3-phase, 480-volt induction motor. The motor was purchased new in 1990 and has been re-wound once. This is a NEMA standard-efficiency motor. The motor’s nominal efficiency (when new) at a 75% load factor is 89.7%, and it is an 1800 rpm TEFC* unit. There is no VFD or other multi-speed control. The control is by one circuit breaker: on or off. totally enclosed fan-cooled type Currently, the motor operates at a 75% load factor, all year. It operates 6,999 hours per year, on average. For five months (May through September), the fan must provide 100% of CFM to the production space, and it runs 24/7. For the “shoulder-season” months, only 50% of the CFM is required, but the fan runs 24/7. During three mid-winter months, only 25% of the CFM is needed, and the fan is manually turned off most of the time to allow some heat retention in the cages. Currently, the client uses a manually-controlled relief damper to adjust the CFM so that excessive air flow is avoided during mid-winter and mild-temperature months, such as in October and April. Here is the existing operational schedule of the fan: Month Motor Operating hrs. % of CFM required Jan 133 25% Feb 133 25% Mar 744 50% Apr 720 50% May 744 100%*
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**30,000 CFM at 1″ WG
Utility cost = $0.075 per kWh (w/o demand) all year, all day; $7.50 per kW demand all year.
Internal labor cost = $50 per hour (Client will use in-house labor.)
PROBLEM: The plant manager has asked you to make a recommendation between two options:
(A) Replace the existing motor with a new NEMA premium-efficiency unit. (Do not confuse premium-efficiency with high-efficiency, because “high-efficiency” is a lower standard.)
(B) Install a VFD to control the existing motor. Assume no post-project change in the CFM requirement listed in the table above.
The manager does not want to do both projects, but wants to know which option will provide a shorter simple payback?
So, your key task is to answer:
“Which option offers the shorter simple payback?”
Are there any other reasons why you might recommend one option over the other? Explain.
Calculate the estimated project cost (labor & materials) for both options A and B.
Calculate the annual energy cost savings for both options. Decide if there will also be demand savings; if so, include them.
Calculate the simple payback. You are not required to calculate NPV or lifecycle cost savings.
Specify the equipment for both A and B, and estimate the material cost. Provide product descriptive literature such as webpage or brochure image. List three vendors, wholesale or retail, via links in footnotes.
Provide a rough estimate of the labor cost for both options. Provide whatever additional assumptions that you need in order to calculate this, but list your assumptions.
Provide URLs in footnotes to document all outside sources.
Assume that there are no utility rebates and no tax credits or deductions for this work.
Points: 100 maximum possible
Due date – Check the CANVAS drop box folder and email from your instructor.
Upload PDF (and/or Word or Excel files) of this casework into CANVAS on or before the deadline.
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