Chapter 3: Energy from the Sun - Wood, Wind and Water
BTU = energy to raise temperature of 1 pound of water by 1oF. 1 pound of water = 8 pounds. 1 kWh = 3413 BTU 1 kilogram = 2.2 pounds 1 cubic foot of gas contains 1031 BTUs 1 ton of coal has 2.5E7 BTU. R value = [area (ft2) x time (hours) x ΔT (ºF)] / BTU. 1. ................
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