Appendix B: Conversion factors and formulas

Conversion factors and formulas

The conversion factors provided in this appendix are intended to ease data calculation for systems that do not provide information in the format requested in this site preparation guide. The following list includes the conversion factors used in this document, as well as additional conversion factors that might be helpful in determining those factors required for site planning.

Conversion factors for refrigeration

•1 watt = 0.86 kcal/hour

•1 watt = 3.412 British thermal unit (BTU)/hour

•1 ton = 200 BTU/minute

•1 ton = 12,000 BTU/hour

•1 ton = 3,517.2 W

Metric equivalents

•1 centimeter = 0.3937 inches

•1 meter = 3.28 feet

•1 meter = 1.09 yards

•1 inch = 2.54 centimeters

•1 foot = 0.305 meters

•1 cubic foot/minute = 1.7 cubic meters/hour

kVa conversions

•Three-phase kilovolt-amperes (kVA) = V x A x √3/1,000

•Single-phase kVA = V x A/1,000

Formulas

•kVA = [Voltage x Current (amps)]/1,000

•Watts = VA x power factor

•BTU = Watts x 3.41

Appendix B: Conversion factors and formulas 85