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# ME 4530 Alternative Energy Systems

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## Questions:

The UoAo value for the structure, based upon usage data above, comes out to be 1,000 Btu/hroF. Based on that. Using the spreadsheet tool provided, and the one from homework #5, the goal is to decrease UoAo to save on energy cost.

1. Take the data from the “modified usage data” spreadsheet provided in homework #5, and in addition to pulling out gas usage for water heating and dryer usage, make another take multiplying the remainder by a furnace efficiency of 80%. If you were to replace the 80% efficient furnace with a 95% efficient one, how much money would you save in the months of November-April each year? Looking up the cost of a 200,000 Btu 95% efficient furnace (document this), how many years would it take to pay back the investment?

2. Windows are a notorious path for heat flow into or out of a building. The current windows in this stricter have a U-factor of 0.81 Btu/hrft2oF. Look up the U-factor for 3 commercially-available windows that are better than what is in there. Detail the cost assuming all windows in the building are 5’ tall x 3’ wide double hung. Add 10% to the cost for installation, and make a small table
detailing the effect of the 3 window upgrades on UgAg, and on UoAo. As part of the table, include the savings in gas for the months of November-April each year, and the payback period in years.

3. Instead of replacing windows, a homeowner who happens to be a thermal sciences Professor  comes up with the idea of simply installing exterior storm windows. Assuming each storm window costs \$75, how does this impact UgAg, and on UoAo? Again, what is the savings in gas for the months of November-April each year, and the payback period for storm windows in years.

4. Instead of the current insulation, a homeowner who happens to be a thermal sciences Professor comes up with the idea of tearing out his drywall, removing the R-13 fiberglass insulation, putting in spacers over the studs so that instead of 3 ½ inches the cavities are 4 inches, replacing it with rigid board extruded polystyrene insulation (XPS), and replacing the drywall. Calculate the effect of this upgrade on UwAw, and on UoAo. Look up the cost of the XPS and the drywall and calculate
the payback period of this improvement.
5. Repeat #4, but in this case said Professor gets the XPS at a 50% discount and decides to thicker
spacers so that he can put in 4 layers 2-inch thick XPS. Again, calculate the effect of this upgrade
on UwAw, and on UoAo, including the payback period of this improvement. Are there any
additional benefits to having XPS over the fiberglass insulation?

### Cite This Work

My Assignment Help (2021) Alternative Energy Systems [Online]. Available from: https://myassignmenthelp.com/free-samples/me-4530-alternative-energy-systems/different-materials.html
[Accessed 19 April 2021].

My Assignment Help. 'Alternative Energy Systems' (My Assignment Help, 2021) <https://myassignmenthelp.com/free-samples/me-4530-alternative-energy-systems/different-materials.html> accessed 19 April 2021.

My Assignment Help. Alternative Energy Systems [Internet]. My Assignment Help. 2021 [cited 19 April 2021]. Available from: https://myassignmenthelp.com/free-samples/me-4530-alternative-energy-systems/different-materials.html.

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