Thermal Units
Latent heat of ice	= 144 BTU/lb	= 288,000 BTU/ton
1 ton refrigeration	= 12,000 BTU/hr	= 288,000/24 hours
1 British Thermal Unit (BTU)		= .252 kcal
1 kilo – calorie (kcal)		= 3.97 BTU
1 BTU/lb		= 0.555 kcal/kg
1 watt		= 1.8 BTU/lb
		= 1 kcal/kg/°C.
		= 3.413 BTU/hr
HEAT, ENERGY, WORK
1 ft lb	= .001285 BTU	= 0.13826 kg-meter
1 joule	= 1 watt – second	= .000948 BTU
1 BTU	= 778.1 ft lb	= .252 kcal
1 KCAL	= 3.968 BTU	= 1000 cal
1 hp-hr	= .746 kw-hr	= 2544.7 BTU
1 kw-hr	= 1.341 hp-hr	= 3413 BTU
1 boiler horsepower	= 33479 BTU/hr	= Evaporation of 34.5 water/hr at 212° F.