Engineering tools for HVAC and heat exchanger design
Design finned coils, analyze psychrometric processes, generate 2D drawings and 3D models, and optimize thermal systems.
What ExCoil does
A complete engineering platform for thermal system design, from psychrometric analysis to 3D geometry export.
Psychrometric Analysis
Interactive psychrometric chart with 10 air properties, 5 HVAC processes, and ASHRAE-based calculations. Free to use.
Finned Coil Design
Size DX evaporators, condensers, chilled water, hot water, steam coils, and dry coolers with engineering-grade thermal calculations.
Automatic Circuit Generation
Generate coil circuiting configurations automatically with same-side and opposite-side connections, balanced and unbalanced distributions.
2D Engineering Drawings
Export professional 2D dimensional drawings in PDF with ISO-standard annotations, dimension lines, and title blocks.
3D Geometry Export
Generate 3D models of heat exchangers with tubes, fins, and return bends. Export as STL for CAD integration.
Thermal Visualization
Real-time 3D thermal heatmaps showing air and fluid temperature distribution across the coil with NTU-based calculations.
Supported coil types
Six calculator modules covering the most common finned-tube heat exchanger applications in HVAC and refrigeration.
Built for engineers
Transparent calculations
Every result is traceable. NTU-LMTD methods, ASHRAE psychrometrics, and documented correlations.
Engineering accuracy
Segment-by-segment solver with real refrigerant properties, fin efficiency, and fouling factors.
Accessible tools
No installation required. Works in the browser. Free psychrometric calculator. Professional plans for advanced features.
Start designing heat exchangers
Create a free account and access the psychrometric calculator, coil sizing tools, and engineering drawings.