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U = Overall heat transfer coefficient in Btu/(ft2-hr-deg F) A = Area in square feet T1 = outdoor temperature in degrees F T2 = indoor temperature in degrees F For heat gains due to people, equipment (hooded and unhooded), and lighting
The Btu should not be confused with the Board of Trade Unit (BTU), an obsolete UK synonym for kilowatt hour (1 kW⋅h or 3,412 Btu). The Btu is often used to express the conversion-efficiency of heat into electrical energy in power plants. Figures are quoted in terms of the quantity of heat in Btu required to generate 1 kW⋅h of electrical energy.
In the United States, U-value is expressed as British thermal units (Btu) per hour-square feet-degrees Fahrenheit: Btu/(h⋅ft 2 ⋅°F) Within this article, U-values are expressed in SI unless otherwise noted. To convert from SI to US customary values, divide by 5.678. [1]
The whole thing is on the Farouki reference footnote [118] and it comes with graphs and with formulas. To make it easier a lb/ft 3 is about 0.01601846 grams/cm 3 and a Btu in./ft 2 hr °F is about 0.14413139 W ⋅ m −1 ⋅ K −1. Soils, frozen, above saturation Higashi Soils Soil A r* = 0.7: K = 3.953 W ⋅ m −1 ⋅ K −1 Soil B r = 0.8 ...
Download as PDF; Printable version ... ≈ 5.8 × 10 6 BTU 59 °F: ... 1 ⁄ 100 of the energy required to warm one gram of air-free water from 0 °C to 100 °C at a ...
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12,000.00 Btu IT /h 2,593.90 ft⋅lbf/s A ton of refrigeration ( TR or TOR ), also called a refrigeration ton ( RT ), is a unit of power used in some countries (especially in North America) to describe the heat-extraction capacity of refrigeration and air conditioning equipment.
[1] [2] It therefore has units of BTU/watt-hr. The higher the HSPF rating of a unit, the more energy efficient it is. An electrical resistance heater, which is not considered efficient, has an HSPF of 3.41. [3] Depending on the system, an HSPF ≥ 9 can be considered high efficiency and worthy of a US Energy Tax Credit. [4]