HVAC ENGINEERING TOOL

Sensible Heat Airflow Calculator

Calculate required SI or IP airflow from sensible heat and temperature difference.

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Formula / Method

Qs = ρ × Cp × V̇ × ΔT

Engineering Method & Assumptions

Dry-air density 1.204 kg/m³ and Cp 1.006 kJ/(kg·K).
Reference: 20 °C and 101.325 kPa.
No latent load or altitude correction.

Applicability: Use a psychrometric/load analysis where latent load, moisture, elevation, or variable air properties are material.

WHEN TO USE THIS TOOL

Useful during airside & ventilation work.

Quick-check airflow, velocity, room-air-change or ventilation relationships during design reviews.
Compare alternate design conditions before moving into detailed equipment or duct selection.
Use as a transparent check alongside project criteria, applicable standards and manufacturer data.

Frequently asked questions

What load does this calculator include?

It includes sensible heat only and does not include latent heat associated with moisture.

Is the 1.08 CFM equation used?

No. The authoritative engine uses the documented SI air properties; 1.08 is shown only as a field reference.

Does altitude affect the result?

Yes, air density varies with altitude, but Phase 1 applies no altitude correction.