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In the United States and Canada, the R-value that describes the performance of thermal insulation is typically quoted in square foot degree Fahrenheit hours per British thermal unit (ft 2 ⋅°F⋅h/Btu). For one square foot of the insulation, one Btu per hour of heat flows across the insulator for each degree of temperature difference across it.
Cost cutting features included a compact, two-story floor plan which measured 30 feet (9.1 m) square plus a narrow entry and stairway extension. The four sides were also designed identically, so that a single set of concrete forms could have been used — only minor modifications would have been required to accommodate the stairwell.
Installed faced fiberglass batt insulation with its R-value visible (R-21) [1]. The R-value (in K⋅m 2 /W) is a measure of how well a two-dimensional barrier, such as a layer of insulation, a window or a complete wall or ceiling, resists the conductive [2] flow of heat, in the context of construction. [3]
When an upper floor was included, the inhabitants used it as living quarters, while the ground floor was used as a stable for livestock and for storage. [1] There were multiple variations on the basic four-room house. Some had a five-, three-, or two-room layout, and sometimes the rooms were divided by additional walls into smaller areas.
A quad is a unit of energy equal to 10 15 (a short-scale quadrillion) BTU, [1] or 1.055 × 10 18 joule (1.055 exajoules or EJ) in SI units. The unit is used by the U.S. Department of Energy in discussing world and national energy budgets. The global primary energy production in 2022 was 637.8 quad, i.e., 672.9 EJ. [2]
For petroleum gases, the standard cubic foot (scf) is defined as one cubic foot of gas at 60 °F (288.7 K; 15.56 °C) and at normal sea level air pressure. The pressure definition differs between sources, but are all close to normal sea level air pressure. A pressure of 14.696 pounds per square inch (1.00000 atm; 101.325 kPa). [2]
The first 5,000-square-foot (460 m 2) zero-energy design [170] home was built in 1979 with support from President Carter's new United States Department of Energy. It relied heavily on passive solar building design for space heat, water heat and space cooling. It heated and cooled itself effectively in a climate where the summer peak temperature ...
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