100. One easy way to reduce heating (and cooling) costs is to add extra insulation in the attic of a house. Suppose a single-story cubical house already had 15 cm of fiberglass insulation in the attic and in all the exterior surfaces. If you added an extra 8.0 cm of fiberglass to the attic, by what percentage would the heating cost of the house drop? Take the house to have dimensions 10 m by 15 m by 3.0 m. Ignore air infiltration and heat loss through windows and doors, and assume that the interior is uniformly at one temperature and the exterior is uniformly at another. 101. Many decisions are made on the basis of the payback period: the time it will take through savings to equal the capital cost of an investment. Acceptable payback times depend upon the business or philosophy one has. (For some industries, a payback period is as small as 2 years.) Suppose you wish to install the extra insulation in the preceding problem. If energy cost $1.00 per million joules and the insulation was $4.00 per square meter, then calculate the simple payback time. Take the average AT for the 120-day heating season to be 15.0 °C.
100. One easy way to reduce heating (and cooling) costs is to add extra insulation in the attic of a house. Suppose a single-story cubical house already had 15 cm of fiberglass insulation in the attic and in all the exterior surfaces. If you added an extra 8.0 cm of fiberglass to the attic, by what percentage would the heating cost of the house drop? Take the house to have dimensions 10 m by 15 m by 3.0 m. Ignore air infiltration and heat loss through windows and doors, and assume that the interior is uniformly at one temperature and the exterior is uniformly at another. 101. Many decisions are made on the basis of the payback period: the time it will take through savings to equal the capital cost of an investment. Acceptable payback times depend upon the business or philosophy one has. (For some industries, a payback period is as small as 2 years.) Suppose you wish to install the extra insulation in the preceding problem. If energy cost $1.00 per million joules and the insulation was $4.00 per square meter, then calculate the simple payback time. Take the average AT for the 120-day heating season to be 15.0 °C.
100. One easy way to reduce heating (and cooling) costs is to add extra insulation in the attic of a house. Suppose a single-story cubical house already had 15 cm of fiberglass insulation in the attic and in all the exterior surfaces. If you added an extra 8.0 cm of fiberglass to the attic, by what percentage would the heating cost of the house drop? Take the house to have dimensions 10 m by 15 m by 3.0 m. Ignore air infiltration and heat loss through windows and doors, and assume that the interior is uniformly at one temperature and the exterior is uniformly at another. 101. Many decisions are made on the basis of the payback period: the time it will take through savings to equal the capital cost of an investment. Acceptable payback times depend upon the business or philosophy one has. (For some industries, a payback period is as small as 2 years.) Suppose you wish to install the extra insulation in the preceding problem. If energy cost $1.00 per million joules and the insulation was $4.00 per square meter, then calculate the simple payback time. Take the average AT for the 120-day heating season to be 15.0 °C.
I need help with this problem and an explanation for the solution described below. (University Physics 1: Thermodynamics: Temperature and Heat).
Transcribed Image Text:100. One easy way to reduce heating (and cooling) costs is to add extra insulation in the attic of a house.
Suppose a single-story cubical house already had 15 cm of fiberglass insulation in the attic and in all the
exterior surfaces. If you added an extra 8.0 cm of fiberglass to the attic, by what percentage would the
heating cost of the house drop? Take the house to have dimensions 10 m by 15 m by 3.0 m. Ignore air
infiltration and heat loss through windows and doors, and assume that the interior is uniformly at one
temperature and the exterior is uniformly at another.
101. Many decisions are made on the basis of the payback period: the time it will take through savings to
equal the capital cost of an investment. Acceptable payback times depend upon the business or
philosophy one has. (For some industries, a payback period is as small as 2 years.) Suppose you wish to
install the extra insulation in the preceding problem. If energy cost $1.00 per million joules and the
insulation was $4.00 per square meter, then calculate the simple payback time. Take the average AT for
the 120-day heating season to be 15.0 °C.
Science that deals with the amount of energy transferred from one equilibrium state to another equilibrium state.
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