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It was originally defined as the rate of heat transfer that results in the freezing or melting of 1 short ton (2,000 lb; 907 kg) of pure ice at 0 °C (32 °F) in 24 hours. [ 1 ] [ 2 ] The modern definition is exactly 12,000 Btu IT /h (3.516853 kW ).
He designed a new type of low-pressure steam heating system, Trane vapor heating. Reuben Trane, James' son, earned a mechanical engineering degree in 1910 and joined his father's plumbing firm. [6] In 1913, James and Reuben incorporated The Trane Company. By 1916, the Tranes focused their attention on manufacturing heating products.
The turn down ratio depends on the system configuration and manufacturer. It modulates from 15 or 25% up to 100% at full capacity with a single inverter from 12 to 100% with a hybrid tandem. This method is the most efficient way to modulate an air conditioner's capacity. It is up to 58% more efficient than a fixed speed system. [citation needed]
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