2. Early showerheads consumed either 5 or 7 gallons of water per minute (gpm). Federal plumbing standards (beginning with the Energy Policy Act of 1992) mandated that showerheads use no more than 2.5...

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Extracted text: 2. Early showerheads consumed either 5 or 7 gallons of water per minute (gpm). Federal plumbing standards (beginning with the Energy Policy Act of 1992) mandated that showerheads use no more than 2.5 gpm to conserve water and save (hot water) energy. High-efficiency showerheads use 1.5 or 1.75 gpm. An older showerhead (5 gpm) is used, on average, for 15 minutes. Determine the gallons of water used if the shower is used twice a day over a year (365 days). а. A high-efficiency showerhead (1.5 gpm) is used for 15 minutes. Determine the gallons of water used if the shower is used twice a day over a year (365 days). b. Determine the water savings, in gallons/year, by switching from the older to the high- efficiency showerhead, if the shower is used twice a day over a year (365 days). с. In the U.S., shower water is heated, on average, from 50°F to 110°F. Since a Btu equates to a 1°F temperature increase in one pound of water and a gallon of water weighs about 8.3 Ib, water for a shower is heated with 498 Btu/gallon*. After water heater-efficiency losses, water heating consumes about 600 Btu/gallon. Determine the energy savings, in Btu/year, by switching from the older to the high-efficiency showerheads used twice a day over a year (365 days). d. * 1 Btu/°F-lb - (110°F - 50°F) 8.3 Ib/gal = 498 Btu/gal. Natural gas costs, on average, about $12/MMBtu (MMBtu = 1,000,000 Btu). Determine the energy cost savings, in $/year, by switching from the older to the high-efficiency showerheads used twice a day over a year (365 days). е.