Size automotive A/C compressor displacement and capacity based on cabin volume, heat load, and target temperature.
Input Parameters
Results
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Cooling Load
BTU/hr
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Compressor Displacement
cc/rev
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Cooling Capacity
tons
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Est. Power Draw
HP
Note: Typical car A/C: 1-2 tons (12,000-24,000 BTU/hr). A/C compressor draws 3-7 HP. R-134a being replaced by R-1234yf per EPA regulations.
Reference
Air Load = Volume × 1.08 × ΔT × 0.5 (ACH)
Solar Load ≈ 3000 BTU/hr (glass area)
Occupant Load = N × 400 BTU/hr
Total = Air + Solar + Occupant
Tons = Total / 12,000
Power ≈ Total / (COP × 2545)