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download Excel spreadsheet with macro here. (this spreadsheet converts between sky cover, sunshine, and solar radiation in any of three units.) 1 BTU = 251.9958 Calorie 1 BTU = 1055.056 Joule 1 BTU = 1055.056 Watt-sec 1 Langley = 1 Cal/cm2 1 Calorie = 4.1868 Joule 1 Watt = 1 Joule/sec 1 Watt-sec = 1 Joule 1 Watt/m2 = 0.085985 Lang/hour (see Conversion Sequence 1, below) 1 Lang/hour = 11.6300 Watt/m2 (see Conversion Sequence 1, below) 1 Langley = 41868 Joules/m2 (see Conversion Sequence 2, below) 1 Langley = 41868 Watt-sec/m2 (see Conversion Sequence 2, below) 1 Watt/cm2 = 3170 BTU/ft2-hour (see Conversion Sequence 3, below) 1 Watt/m2 = 0.3170 BTU/ft2-hour (see Conversion Sequence 3, below) 1 Langley/day = 0.484583 Watt/m2 (see Conversion Sequence 4, below) 1 Langley/day = 0.153613 BTU/ft2-hour (see Conversion Sequence 4, below) 1 Watt = 3.41216 BTU/hour (see Conversion Sequence 5, below) Conversion details are below, or download a pdf of this entire page here.
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