Workspace Projects Teams Work Modes

Project Equipment Search tools, tasks and features

All features — every workflow remains available

ToolsUnit Converter →

Convert common HVAC engineering units.

ToolsCooling Capacity →

Convert TR, kW, BTU/h and kcal/h.

ToolsEER / COP →

Convert COP, EER and kW per TR.

ToolsAirflow →

Convert CFM, CMH, L/s and m³/s.

ToolsChilled Water Flow →

Calculate CHW flow from capacity and ΔT.

ToolsPipe Velocity / Flow →

Solve hydronic pipe flow, velocity or internal diameter.

Calculate air changes or required airflow.

ToolsFresh Air →

Calculate outdoor airflow from project-specified people and area rates.

ToolsDuct Calculator →

Solve duct airflow, velocity or area.

ToolsDew Point →

Calculate dew point from temperature and RH.

ToolsCondensation Risk →

Compare surface temperature with ambient-air dew point.

ToolsPsychrometric Calculator →

Calculate pressure-dependent moist-air properties.

ToolsCooling Coil ADP / BF →

Calculate wet-coil apparatus dew point and bypass factor.

ToolsAHU Face Area →

Calculate AHU gross face area or face velocity.

ToolsRefrigerant P-T →

Look up refrigerant saturation pressure or temperature.

ToolsRefrigeration Diagnostics & System Performance →

Calculate blend-aware SH/SC and extend the same field snapshot into pressure ratio, evaporator/condenser air relationships and discharge-temperature context.

ToolsRefrigeration Cycle Analyzer & P-h Diagram →

Analyze a blend-aware single-stage subcritical refrigeration cycle with COP, mass flow and pressure-enthalpy visualization.

ToolsFlash Economizer / Vapor-Injection Cycle →

Analyze a bounded flash-tank economizer cycle with intermediate pressure, flash-vapor injection, stage work, COP comparison and P-h visualization.

ToolsTwo-Stage Compression & Intercooling →

Analyze a bounded two-stage refrigeration cycle with constant-pressure intercooling, stage work, COP, duties and P-h visualization.

ToolsR717 / Ammonia Cycle & P-h →

Analyze a bounded single-stage ammonia cycle with full-state properties, COP, mass flow and pressure-enthalpy visualization.

ToolsR717 Two-Stage Flash Intercooler →

Analyze a bounded industrial-ammonia two-stage flash-intercooler cycle with vessel mass balance, stage duties, COP and P-h schematic.

ToolsR717 Pumped-Liquid / Recirculation →

Analyze ammonia liquid overfeed with low-pressure-receiver flash gas, circulation ratio, pumped flow, compressor burden and pump power.

ToolsAdvanced Cycle Comparison Studio →

Compare compatible single-stage, economized, two-stage, R717 and R744 architectures on a normalized common thermodynamic basis without automatic ranking.

ToolsAdvanced P-h Engineering Workspace →

Overlay compatible refrigeration architectures on one pressure-enthalpy workspace with explicit process, branch and mass-basis interpretation.

ToolsDesign vs Field Refrigeration Performance →

Compare a refrigeration design cycle with stabilized field pressures, temperatures, SH/SC and optional measured capacity/compressor input while keeping model and measurement boundaries explicit.

ToolsRefrigeration Performance Intelligence →

Apply explicit OEM/Project/commissioning tolerances to Design-vs-Field refrigeration evidence, identify deterministic investigation patterns and define Issue Finder/retest follow-up without automatic root-cause claims.

ToolsNatural Refrigerant Architecture Comparison →

Compare implemented R717 and R744 architectures on explicit common inputs with visible comparability limits and no automatic optimization.

ToolsOEM Compressor Envelope Review →

Check a refrigeration compressor operating point against an engineer-entered OEM envelope polygon with source provenance and optional declared limits.

ToolsOEM Compressor Performance Map Interpolation →

Interpolate capacity and absorbed power only inside a user-entered OEM compressor performance grid with provenance and no extrapolation.

ToolsR717 Thermosiphon Oil Cooling →

Calculate ammonia thermosiphon oil-cooling circulation, vapor generation, liquid return and added condenser load from explicit design inputs.

ToolsR744 / CO₂ Transcritical Cycle →

Calculate a bounded single-stage transcritical CO₂ cycle from explicit evaporating, high-side, gas-cooler and compressor-efficiency inputs.

ToolsR744 Flash Tank & Parallel Compression →

Analyze a transcritical CO₂ flash-receiver architecture with parallel flash-gas compression, mass balance, COP and compressor duties.

ToolsR744 / CO₂ Ejector Architecture Analysis →

Screen a vapor-ejector / receiver / parallel-compression CO₂ architecture with explicit entrainment, work-recovery efficiency, receiver split and compressor burden.

ToolsR744 / CO₂ Heat Recovery →

Split direct or parallel-compression CO₂ high-side heat rejection into recoverable heat and remaining gas-cooler duty at fixed pressure.

ToolsR744 Heat-Recovery Pinch & UA Review →

Segment a CO₂ heat-recovery exchanger to find internal pinch/crossover and aggregate UA, with optional area from an explicit U-value.

ToolsTemperature Logger / Pull-down Review →

Review cold-room logger CSV locally for excursions, sampling gaps, pull-down, recovery and service-retest behavior.

ToolsRefrigerant Comparison →

Compare refrigerant family, safety class, GWP, composition and glide behavior.

ToolsHVAC&R Quick Reference →

Search formulas, constants, conversions and engineering reminders.

ToolsSensible Heat →

Calculate airflow from sensible load and ΔT.

ToolsAll free tools →

Browse every calculator, converter and reference.

Specialist features retain their existing access, evidence and safety requirements.

Quick checks work without a Project. Save important results explicitly.

REFRIGERATION · COLD ROOM · FIELD REVIEW

Temperature Logger, Pull-down & Recovery Review

Open logger data locally, apply the correct project or commodity temperature range, and review observed excursions, pull-down, recovery or service-retest behavior without uploading the raw file.

Review a temperature logger CSV

Logger data stays in this browser by default. In Project context, you may deliberately archive the exact CSV/TXT source as private hashed Engineering Evidence.

Logger CSV / delimited textRequired columns: timestamp/date-time and temperature. Comma, semicolon and tab delimiters are supported.

Applicable minimum (°C)

Applicable maximum (°C)

Use the limit from the applicable Project, client, OEM or commodity procedure. The default 2–8 °C values are an editable example, not a universal cold-chain acceptance range.

Pull-down / recovery / service context

Analysis

Measurement location

Reference event

Event date & timeLeave blank to analyse from the first logger point.

Recorded setpoint (°C)

Sustained in-range observation (min)Analysis preference only; not an acceptance rule.

Before / after window (min)

Door condition

Loading condition

Defrost condition

Service / corrective action

Operating context notes

How to use the result

Review sampling gaps first. Declare the measurement location and operating event, then interpret pull-down/recovery timing or before/after service behavior against the correct operating context. The analysis is descriptive and does not create a commodity acceptance rule or root-cause diagnosis.