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The units of an R-value (see below) are usually not explicitly stated, and so it is important to determine from context which units are being used: an R-value expressed in I-P (inch-pound) units [13] is about 5.68 times larger than when expressed in SI units, [14] so that, for example, a window that is R-2 in I-P units has an RSI of 0.35 (since ...
Vacuum Insulating Glass (VIG) units result in R-values as high as R-15 (center of glass). Combining a VIG unit with another glass pane and warm edge spacer result in R-18 (center of glass) or more depending upon the low-e coating(s). Double VIG units with warm edge spacer reach R-25 (center of glass) or more depending upon low-e coatings and ...
The first of the cooling load factors used in this method is the CLTD, or the Cooling Load Temperature Difference. This factor is used to represent the temperature difference between indoor and outdoor air with the inclusion of the heating effects of solar radiation. [1] [5] The second factor is the CLF, or the cooling load factor.
In the United States, the efficiency of air conditioners is often rated by the seasonal energy efficiency ratio (SEER) which is defined by the Air Conditioning, Heating, and Refrigeration Institute, a trade association, in its 2008 standard AHRI 210/240, Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment. [1]
R = Resistance(s) to heat flow in pipe wall (K/W) Other parameters are as above. [16] The heat transfer coefficient is the heat transferred per unit area per kelvin. Thus area is included in the equation as it represents the area over which the transfer of heat takes place. The areas for each flow will be different as they represent the contact ...
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