| Meier
Supply
Company, Inc.
HVACR Specialists
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Miscellaneous Refrigeration Formulas
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To find KW necessary to raise the temperature of air:
KW = (CFM x Temp Rise x 1.08) / 3413
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To convert BTU's to KW:
Total BTU's x 0.0002928
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To convert KW to BTU's:
Total KW x 3413
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To find BTU load on a flow of water:
GPM x H2O Temp difference x 500
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To calculate airflow:
CFM = Area(sqft) x Velocity(fpm)
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Energy Efficiency Ratio (EER):
EER = BTU / Watts
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To find RPM of Belt Drive Compressor:
Motor Speed x Motor Pulley Size / Compressor Flywheel Size
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