Consider a house in Blacksburg, Virginia. The typical annual space-heating load for this size of a house is 100 x 10 Btu

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Consider A House In Blacksburg Virginia The Typical Annual Space Heating Load For This Size Of A House Is 100 X 10 Btu 1 (54.01 KiB) Viewed 48 times

Consider a house in Blacksburg, Virginia. The typical annual space-heating load for this size of a house is 100 x 10 Btu. That is, with no insulation in the attic, we lose about 100 x 10 Btu per year. With insulation in the attic the amount of heat lost each year will be reduced. The value of energy savings that results from adding insulation and reducing heat loss is dependent on what type of residential heating furnace is installed. Assume that an electrical resistance furnace is installed by the builder, and its efficiency is near 100%. The cost of electricity is $0.14 per kWh. The cost of several insulation alternatives and associated space-heating loads for this house are given in the following table. Which amount of attic insulation is most economical? The life of the insulation is estimated to be 26 years. R11 R30 R38 Amount of Insulation R19 3,500 69.8 x 10 Investment cost (5) 6,500 2,500 74 x 10 5,300 67.2x105 Annual heating load (Btu/year) 66.4x10 Recall that 1 Btu = 0.293 Wh and calculate the cost of electricity per million Btu. Fill in the table below. (Round to the nearest cent.) R30 Investment cost (S) 5300 2746.54 Cost of heat loss per year ($) Cost of heat loss over 26 years (S) 71670.14 Total life cycle costs ($) 91359.74 R11 2500 3035.48 78922.48 100604.48 OD R19 3500 2863.20 74443.10 94894.50 R38 6500 2723.28 70816.93 91359.74