ENVS 101 Chapter 7 Review Question PDF

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Environmental Science 101 – Chapter 7 Review Questions 1. Total R-Value: - 16.2 (Current Total R-Value) - .68 (Inside Temperature) - .17 (Outside Temperature) ฀ New R-Value Total: 17.05 BTU Calculations: {(8 Hours) [8 x 24 (Wall Size)]}/ 17.05 = 90.088 Btu 3. R-Value: 11/ Wall Size = 1500ft^2/ Degree Day = 5,600 BTU Calculations: 1500ft^2 x 5,600-degree day/ 11 = 763636.364 Btu 5. Total R- Value: - 16.31 (Current R- Value #1) - 8.0 (Current R- Value #2) ฀ New R-Value Total: 24.31 BTU Calculations: [6040 Degree Day x 13]/ 24.31 = 3,229.947 Btu 7. New R- Value: 19.0 BTU Calculations: [6040 Degree Day x 13]/ 19.0 = 4,132.632 Btu The purchase of insulation at 0,45/ft^2 would not be a good idea. Since the r-value is now lowered, it would result in a higher Btu this means it would ultimately be far more expensive. 11. Your house can be made to become more efficient in many different ways. One example would be to rely more on natural sources of energy compared to fossil fuels. If you put solar panels on your house, then you would be using fewer fossil fuels to power your home. Another way is to switch your lightbulbs to ones that are more energy efficient. A third example is not washing your clothes with a dryer as much, rather use a clothes line. 12. To make me save energy in my own house, I could try turning off all my lights when I leave. As small as this may sound, I am gone from my home for long periods of time during the day. If a light is left on then a lot power is drained with energy being wasted.

13. Life Cycle Energy Costs: - Coffee Machine Maker = 100kWh at $8 per year with 200lb of CO2 Emission o Coffee makers would be the most effective in terms of lasting the longest with the least amount of CO2 Emissions - Lighting = 844 kWh at $70 per year with 1,688lb of CO2 Emission - Refrigerator = 1,116 kWh at $93 per year with 2,232lb of CO2 Emission 17. Which Little Bulb is Better:

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15-Watt Fluorescent at $4 to last 10,000 hours (10,000 x .10 = 1,000) 75-Watt Incandescent at 50 cents to last 1,000 hours ฀ This would cost $5 to reach the same amount of hours as the 15-watt (1,000 x .10 = 100) o Ultimately the 15-watt is cheaper in the long term compared to the 75-watt...