Power & efficiency analyzer

Upload logged CT current data to visualize the weekly power pattern, group the week into day types, and compute average power and equivalent full-load hours (EFLH). With a VFD power–flow curve (or a load/unload configuration) it also reports a time-weighted isentropic efficiency — no more transcribing a single operating point by hand.

Step 1: Upload CSV File

Step 2: System Parameters

Real power is calculated as: P = √3 × V × I × PF. Discharge pressure is used for the isentropic efficiency estimate. Inlet air is assumed to be at the CAGI standard 20 °C — intake-temperature effects are handled by the Cold Intake calculator.

System Voltage (V):

208 · 240 · 480 · 600

Power Factor:

Typical 0.80–0.95

Nameplate Power (kW):

Full-load compressor kW

Discharge Pressure (PSI):

Gauge, for efficiency

Zero-Flow Power (kW):

CAGI package input at 0 flow; nets out parasitics for a shaft-side efficiency

Step 3: Control Type & Performance Data

VFD Compressor Non-VFD Compressor

VFD Configuration: Power–Flow Data Points

Enter at least 4 power–flow data points from the CAGI datasheet. These map measured power to flow at each timestep. Click "Add Point" for more rows.

Power (kW)

Flow (CFM)

Step 4: Average-Power Threshold

Samples below this power are treated as idle/off and excluded from average operating power and the efficiency lookup (EFLH still counts all runtime). Auto-set to 50% of the lowest VFD point, or 50% of unloaded power. Edit to override.

Threshold (kW):

Step 5: Weekly Power Pattern

Step 6: Day Types

Days are auto-grouped into buckets by their average power profile (within ~10% ⇒ same bucket). Rename a bucket, reassign a day, add a bucket, or re-run the auto-grouping. Each bucket gets its own profile below; EFLH and average power are still computed across all days.

Step 7: Results

Weeks per year: