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Home Weatherization: A Simulation (CONTINUED) After estimating the cost of each energy-saving inprovement, you want to determine the number of heating seasons it will take to recover the cost of the improvement. The pay-off time for one improvement is found by using this formula. PAY-OFF TIME = COST OF IMPROVEMENT MILLION BTU SAVED X COST PER ANNUALLY MILLION BTU Type of Heat Natural gas Fuel oil Electricity Cost per Million Blu $ 9.50 $14.20 $32.80 Find the pay-off time for each improvement for each type of heating. Round your answers to the nearest hundredth. Improvement Natural gas Oll Electricity 6. Caulking and weather stripping 7. Basement panels 8. Ceiling insulation 9. Storm windows Find the pay-off time for all the improvements combined for each type of heating by substituting the total cost of improvements in the formula above. 10. Natural gas E 11. Oil 12. Electricity Many homes have been constructed with insufficient insulation and without proper weatherization. Homes can be made more energy efficient by adding attic and crawl space insulation, by installing storm doors and storm windows, and by caulking windows and doors. in order to conserve energy and save money on fuel bills, you have decided to investigate a home weatherization program for your house. To weatherize your home, you need to reduce the heat that is lost by conduction and infiltration. Heat lost by conduction is the heat that escapes Home Weatherization: A Simu through the building materials. All materials used in building construction reduce the flow of heat. but insulation if more effective in reducing the flow of heat. Heat loss by infiltration is heat lost through the leakage of air. Air can leak in and out of a house through the cracks around windows You have inspected your home and consulted an energy savings guide to come up with the data in the chart below. ESTIMATE OF ANNUAL ENERGY SAVINGS Proposed Changes Heat To Be Saved Type of Heat Loss to Building (Million Btu) Infiltration Caulk and weatherstrip all doors and windows 25.1 Conduction through: Insulate upper portion of Floors basement walls 75 Ceilings Add 6 in. of insulation to ceiling 15.0 Windows Add storm windows 7.95 Walls Nonewalls already insulated TOTALS 55.55 In order to save energy. you decide to make the proposed changes to your home. Complete the chart below to estimate the cost of each change. Since you will do the work yourself, there will be no labor charge. Estimated Cost Number of Units Type of Material 10 tubes Cost per Unit 5 tubes of $1.89 each 5 tubes at $4.29 each 17-ft roll costs $2.65 1. Caulking 221 ft 2. 3. 1630,90 534 ts 32-sq-ft panel costs $4.39 $134.09 387.25 Weather stripping Foam panels for basement walls Insulation: 6-in. fiberglass balts Storm windows 992 sq ft 1250 sq ft 50-sqft roll costs $15.49 4. 8 $135 per window 5. Total 15 16 Home Weatherization: A Simulation (CONTINUED) After estimating the cost of each energy-saving inprovement, you want to determine the number of heating seasons it will take to recover the cost of the improvement. The pay-off time for one improvement is found by using this formula. PAY-OFF TIME = COST OF IMPROVEMENT MILLION BTU SAVED X COST PER ANNUALLY MILLION BTU Type of Heat Natural gas Fuel oil Electricity Cost per Million Blu $ 9.50 $14.20 $32.80 Find the pay-off time for each improvement for each type of heating. Round your answers to the nearest hundredth. Improvement Natural gas Oll Electricity 6. Caulking and weather stripping 7. Basement panels 8. Ceiling insulation 9. Storm windows Find the pay-off time for all the improvements combined for each type of heating by substituting the total cost of improvements in the formula above. 10. Natural gas E 11. Oil 12. Electricity Many homes have been constructed with insufficient insulation and without proper weatherization. Homes can be made more energy efficient by adding attic and crawl space insulation, by installing storm doors and storm windows, and by caulking windows and doors. in order to conserve energy and save money on fuel bills, you have decided to investigate a home weatherization program for your house. To weatherize your home, you need to reduce the heat that is lost by conduction and infiltration. Heat lost by conduction is the heat that escapes Home Weatherization: A Simu through the building materials. All materials used in building construction reduce the flow of heat. but insulation if more effective in reducing the flow of heat. Heat loss by infiltration is heat lost through the leakage of air. Air can leak in and out of a house through the cracks around windows You have inspected your home and consulted an energy savings guide to come up with the data in the chart below. ESTIMATE OF ANNUAL ENERGY SAVINGS Proposed Changes Heat To Be Saved Type of Heat Loss to Building (Million Btu) Infiltration Caulk and weatherstrip all doors and windows 25.1 Conduction through: Insulate upper portion of Floors basement walls 75 Ceilings Add 6 in. of insulation to ceiling 15.0 Windows Add storm windows 7.95 Walls Nonewalls already insulated TOTALS 55.55 In order to save energy. you decide to make the proposed changes to your home. Complete the chart below to estimate the cost of each change. Since you will do the work yourself, there will be no labor charge. Estimated Cost Number of Units Type of Material 10 tubes Cost per Unit 5 tubes of $1.89 each 5 tubes at $4.29 each 17-ft roll costs $2.65 1. Caulking 221 ft 2. 3. 1630,90 534 ts 32-sq-ft panel costs $4.39 $134.09 387.25 Weather stripping Foam panels for basement walls Insulation: 6-in. fiberglass balts Storm windows 992 sq ft 1250 sq ft 50-sqft roll costs $15.49 4. 8 $135 per window 5. Total 15 16
