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ExCoil

Heat exchanger engineering software

Design finned-tube coils and shell-and-tube heat exchangers in your browser

ExCoil rates and sizes seven types of heat exchangers with real refrigerant properties, row-by-row air-side models and explicit hydraulic checks. Every result shows its energy balance, warnings and limits — and feeds the same geometry into 2D drawings, 3D models and reports.

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Free plan: all six finned-tube calculators, no time limit, no credit card.

ExCoil DX evaporator results screen showing total capacity, sensible heat ratio, air outlet state and energy balance
heat exchanger modules
7
refrigerants with CoolProp-traceable property tables
16
tube, fin and shell materials
21
website languages
6

One engineering workspace, seven heat exchanger types

Each module has its own physical model. They share the same geometry library, material database, unit system, project manager and report engine.

From inputs to drawings without retyping

The geometry you calculate is the geometry you draw. Circuitry, headers and connections are derived from one model and reused everywhere.

  1. 1. Define the duty

    Enter air, refrigerant, water, glycol or steam conditions in the units you prefer: SI, US HVAC, refrigeration or a custom pack saved per user.

  2. 2. Rate or size

    Rate a known coil, or let the solver search geometry and flow. Unreachable targets are reported as not met instead of being forced.

  3. 3. Check physics and hydraulics

    Energy balance, velocities, pressure drops, saturation drop and circuit loading are shown with explicit warnings and blocking conditions.

  4. 4. Export deliverables

    PDF technical report, CSV/JSON data, 2D drawing with DXF, and on Enterprise a 3D model with STL and STEP export — all from the same model.

Real screens from the application

Screenshots captured from the running software with default example inputs. No mock-ups.

DX evaporator results with energy balance and alerts
DX evaporator results with energy balance and alerts
Automatic refrigerant circuitry with distributor and suction header
Automatic refrigerant circuitry with distributor and suction header
Chilled water coil 3D model with supply and return headers
Chilled water coil 3D model with supply and return headers
2D general arrangement drawing with connection table
2D general arrangement drawing with connection table
Shell-and-tube 3D cutaway: tubes, baffles, nozzles and saddles
Shell-and-tube 3D cutaway: tubes, baffles, nozzles and saddles
Shell-and-tube general arrangement and tube layout
Shell-and-tube general arrangement and tube layout
Steam coil with steam inlet and condensate connections
Steam coil with steam inlet and condensate connections
Dry cooler coil with supply and return connections
Dry cooler coil with supply and return connections
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Calculation engine you can inspect

Published correlations, physical tube counts and explicit assumptions. Where a model does not apply, ExCoil says so.

Real fluid properties

Refrigerant tables generated with CoolProp 7.2 (HEOS) for 16 fluids, including R32, R410A, R134a, R1234yf, R1234ze, R290, R744 and R717, with a SHA-256 manifest.

Air side

Wang–Chi–Chang (2000) heat transfer and friction for plain fins with actual fin thickness, Schmidt fin efficiency, and dry or wet surface by enthalpy potential.

Refrigerant side

Moving-boundary models for DX evaporators and condensers, pressure-coupled saturation, and Domanski–Hermes return-bend pressure drop.

Shell side

Bell-Delaware heat transfer and pressure drop with leakage and bypass corrections, on a tube layout computed from the real shell and bundle clearances.

Honest results, not marketing numbers

ExCoil is built for engineers who need to defend a selection. The software reports when a coil does not reach its target, when a circuit is hydraulically infeasible or when an input falls outside the validity range of a correlation.

  • Energy balance between air and fluid side shown on every result
  • No hidden calibration factors applied without a test reference
  • Physical tube counts — fractional tubes are never created
  • Commercial pipe sizes for headers and connections
  • Results are preliminary estimates; certification remains with you

Who uses ExCoil

Coil and heat exchanger manufacturers

Quote faster with consistent selections, branded PDF reports, drawings and bills of materials generated from one model.

HVAC&R consulting engineers

Check supplier selections, compare alternatives and document assumptions with traceable property data.

OEM and plant engineering teams

Size coils for air handlers, chillers, heat pumps, dry coolers and process heat exchangers in a single workspace.

Students and researchers

Explore how geometry, circuiting and fluids change performance. Academic access is available after review.

Start free, upgrade when you need deliverables

The free plan includes all six finned-tube calculators. Professional adds saving, PDF reports and 2D drawings; Enterprise adds 3D, STEP, circuitry and API access.

See pricing

Run your first coil calculation in minutes

Create a free account, open a calculator and compare the result with your current method.

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