BuildFlo Design Guide · Thermal · CIBSE Guide B
Duct coil cooling calculator
Size ducted cooling coil airflow or off-coil temperature from sensible cooling load. Free duct coil cooling calculator.
What this calculator does
Duct coil cooling helps UK building services engineers with room airflow or off-coil temperature from sensible cooling load. The calculation follows CIBSE Guide B methods used in everyday MEP design — enter your project inputs below for a first-pass result.
Whether you searched for "duct coil cooling", "duct coil cooling calculator", or "how to duct coil cooling", this page gives you a working tool plus the context to use it on a real job.
When to use it
Use this for early-stage sizing and sanity checks on UK building services work. It is not a substitute for issued calculations — verify against the project specification, drawings, and relevant standard before sign-off.
How to use it
1. Fill in the inputs for your scenario (defaults are starting points only). 2. Click Calculate — results include the method and assumptions where applicable. 3. Verify against the project specification and relevant standard before issuing.
Typical output unit: l/s.
Tips
- Defaults are indicative — replace with project-specific values from the architect, structural, or MEP spec.
- For issued calculations, save results in your BuildFlo project and attach to the calculation folder.
- Need the regulation citation? Open BuildFlo chat in the app and ask about duct coil cooling under UK standards.
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Frequently asked questions
- How do I calculate cooling coil airflow?
- Enter sensible cooling load and desired off-coil temperature. Airflow = sensible duty / (ρ × cp × ΔT).
- Does this include latent cooling?
- This calculator addresses sensible load only. Dehumidification and latent duty require additional psychrometric analysis.
- What off-coil temperature is typical for comfort cooling?
- 14–16°C off-coil is common for air handling units. Lower temperatures increase dehumidification but risk cold draughts at diffusers.
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