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Latent Heat Airflow Calculator

Latent (moisture) load an airflow carries from the humidity-ratio difference.

0
Latent heat (kW)
0
Moisture moved (kg/h)

The 3.0 = ฯ ร— latent heat (1.2 ร— 2,501/1000). Coastal climates: latent can be half the coil duty โ€” a sensible-only calc undersizes badly.

Formula

Q(W) = 3.0 ร— L/s ร— ฮ”w(g/kg) (US: BTU/h = 0.68 ร— CFM ร— ฮ”gr)
References: ASHRAE Fundamentals โ€” air-side equations

Latent Heat Airflow Calculator is a free latent heat formula for HVAC designers, technicians and energy auditors โ€” instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.

About Latent Heat Airflow Calculator

Latent (moisture) load an airflow carries from the humidity-ratio difference. The calculation implements Q(W) = 3.0 ร— L/s ร— ฮ”w(g/kg) (US: BTU/h = 0.68 ร— CFM ร— ฮ”gr) (ASHRAE Fundamentals โ€” air-side equations). The 3.0 = ฯ ร— latent heat (1.2 ร— 2,501/1000). Coastal climates: latent can be half the coil duty โ€” a sensible-only calc undersizes badly.

How to use Latent Heat Airflow Calculator

  1. 1Enter Airflow in L/s.
  2. 2Enter Humidity ratio difference in g/kg.
  3. 3Read Latent heat, Moisture moved instantly โ€” no submit button needed.
  4. 4Need US units? Flip the SI/Imperial toggle and every field converts.

Why use Latent Heat Airflow Calculator?

  • โœ“Implements the standard formula โ€” Q(W) = 3.0 ร— L/s ร— ฮ”w(g/kg) (US: BTU/h = 0.68 ร— CFM ร— ฮ”gr)
  • โœ“Reference cited on-page: ASHRAE Fundamentals โ€” air-side equations
  • โœ“One-click SI โ‡„ Imperial toggle โ€” values convert in place, physics stays in SI
  • โœ“Runs entirely in your browser โ€” nothing uploaded, free forever

Frequently asked questions

What formula does the Latent Heat Airflow Calculator use?+

It computes Q(W) = 3.0 ร— L/s ร— ฮ”w(g/kg) (US: BTU/h = 0.68 ร— CFM ร— ฮ”gr), per ASHRAE Fundamentals โ€” air-side equations. The formula is displayed under the result.

What should I keep in mind when using this calculator?+

The 3.0 = ฯ ร— latent heat (1.2 ร— 2,501/1000). Coastal climates: latent can be half the coil duty โ€” a sensible-only calc undersizes badly.

Is this based on ASHRAE methods?+

The calculations follow the standard ASHRAE/ISHRAE formulations cited under the result, simplified where industry practice does the same. For permit-grade design, confirm with the full code procedure.

Is the Latent Heat Airflow Calculator free to use?+

Yes โ€” completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.

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