Cross-brand compressor benchmark in one click — Bitzer vs Frascold vs Copeland on the same chart
By DigiEntropy Engineering · 2026-01-01 · 6 min read
Picking between a Bitzer 4PCS-10.2 and a Frascold S30-153Y used to mean two PDF datasheets, a calculator, and an hour. With the DigiEntropy Benchmark tool it's two clicks. Here's how it works and why cross-brand benchmarking finally got easy.
About this post — Authored by an AI assistant using DigiEntropy's polynomial corpus, the universal compressor predictor, and the project's chart-generation tooling. Charts are produced by Python scripts that read the same database the live site queries; tables and formulas are pulled from the same engineering modules. Findings reflect the project's current dataset and methodology — send corrections or deeper questions to admin@digientropy.com. Picking between a Bitzer 4PCS-10.2 and a Frascold S30-153Y at -10/40°C on R448A used to mean opening two PDF datasheets, scrolling to the right polynomial table, converting units, and squinting at the numbers. With the DigiEntropy Benchmark tool it's two clicks: pick the models, set the operating point, read the chart. Why cross-brand benchmarking has been so hard Every compressor manufacturer publishes performance data slightly differently: - Polynomial standard: Bitzer and Frascold use EN 12900 (10-coefficient bivariate in SST/SDT, °C, Watts). Copeland publishes AHRI 540 (10-coefficient in °F, BTU/h). Hanbell uses a 15-coefficient 4th-order variant. Danfoss uses EN 12900 with a fixed RGT = 20°C baseline. - Units: kW, BTU/h, hp, RT — every brand picks one. - Conditions: some publish at 0/40, some at -10/40, some at custom SST/SDT pairs that don't line up across manufacturers. - Capacity control: full-load, part-load, VFD, IGV — different brands expose different fractions, often as multipliers rather than independent polynomials. So the actual "compare Bitzer vs Frascold" workflow involves: download two PDFs, find the right polynomial table in each, normalize units, normalize standards, re-evaluate at a common operating point. That's a 30-60 minute job, repeated for every project. What the Benchmark tool does Benchmark takes two or more compressors plus a single operating point (evaporating + condensing temperature, refrigerant, superheat, subcooling) and renders: - A side-by-side capacity table — cooling capacity (Qe), power input (P), COP, mass flow, current — at the chosen operating point. - The operating envelope chart with every compressor's SST/SDT bounds overlaid, so you can immediately see whether the operating point is even inside everyone's envelope. - A performance plot — capacity, power, or COP swept across SST or SDT — with one curve per compressor. - A p-h diagram showing the refrigeration cycle for the picked refrigerant. Behind the scenes the tool reads the polynomials from v2polynomialrecordsflat (Bitzer), hanbellpolynomialrecords, frascoldpolynomialrecords, copelandpolynomialrecords, etc. — every…