Appendix B: 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 inch
•1 meter = 3.28 feet
•1 meter = 1.09 yards
•1 inch = 2.54 centimeter
•1 feet = 0.305 meter
•1 cubic feet/minute (CFM) = 1.7m3/hour
kVA conversions
•Three phase
•Single phase kVA = V × A⁄1000
Formulas
•kVA = [Voltage x Current (amps)]/1000
•Watts = VA x power factor (PF)
•Btu = Watts x 3.41
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