Solar Hot Water Math, Formulas and Conversions
120 - 50 = DELTA T 70F
for Solar Hot Water Math Calculations
Iwalani's Voyage Around the World
Weekly logs of Iwalani's three year circumnavigation written by Philip Shelton, Amy P. Wood and Stewart the Cat.
The "World Voyagers" Book
A true story of the three year circumnavigation by Philip Shelton, Amy Wood and Stewart the cat. From designing and building a 42 foot wooden cutter "Iwalani" to sailing around the world— this is not a watered down, sugar coated tale, but a "no holds barred" account of just what it's like to live a "dream."
BTU (British Thermal Unit) Calculations
1 BTU=1 DEGREE FARENHEIT INCREASE IN ONE POUND OF WATER.
8.34 POUNDS IN ONE GALLON
Solar Constant (measured outside the earth's atmosphere by satellite) is about 1.3 kilowatts (1,366 watts) per square meter (kW/m²)
Solar Insolation Maximum sun energy (irradiance) reaching the surface of the earth over a given time period.
Correct Flow Rates for Evacuated Tube Collector
231 CUBIC INCHES PER GALLON
7.481 GALLONS PER CUBIC FOOT
1 kWh (kilo watt hours) = 3412.1415 BTU's
1 BTU = 0.00029307108 kWh
Btu Content of Common Energy Units
DELTA T = TEMPERATURE DIFFERENCE BETWEEN TWO VALUES (100F-90F = 10F DELTA T)
F TO C CONVERSION (F - 32.0) / 1.8 = C
KILOGRAMS * 2.204623 = POUNDS
LITERS * 0.264272 = GALLONS
QUARTS * 0.946353 = LITERS
LITERS * 1.056688 = QUARTS
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