THE NUMBERS, EXPLAINED
How to use this calculator.
No heat recovery or latent heat is included. This is not ventilation design advice.
Start with your inputs
Enter airflow (m³/hour), air density (kg/m³), heat capacity (j/kgk), temperature difference (k). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Airflow (m³/hour) | 100 |
| Air density (kg/m³) | 1.2 |
| Heat capacity (J/kgK) | 1005 |
| Temperature difference (K) | 20 |
A worked example
With the example inputs above, sensible heat loss (w) is 670. Change the inputs to explore your own scenario.
Putting the example numbers into the formula
Sensible heat loss (W)
(100) ÷ 3600 × (1.2) × (1005) × (20) = 670
| Result | Example answer |
|---|---|
| Sensible heat loss (W) | 670 |
How this is calculated
Sensible heat loss (W)
a ÷ 3600 × b × c × d
Symbols and units
- a
- Airflow (m³/hour)
- b
- Air density (kg/m³)
- c
- Heat capacity (J/kgK)
- d
- Temperature difference (K)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions and limits
No heat recovery or latent heat is included. This is not ventilation design advice.
Calculations use the values you enter. Blank or invalid inputs show an error instead of silently substituting zero. Results are displayed to useful precision; calculations retain the underlying numeric precision.
Questions about this tool
What does the result tell me?
Sensible heat loss (W). The result applies to the method and inputs described above. Check the units and assumptions before using it in a decision.
Why might another calculator differ?
Differences in units, rounding, timing or model definitions can produce different answers. Compare the input definitions and the method, rather than only the final number. For this tool: No heat recovery or latent heat is included. This is not ventilation design advice.
Are my inputs stored or sent to AI?
Calculations on this page happen in your browser. The separate AI question finder sends its submitted conversation to OpenAI; these calculator fields are not sent. Favourites and recent tool names are stored locally. A shared link contains the inputs you choose to include.
Review status
Software example and browser checks are recorded in our quality report. No external expert review is claimed. Created with coding assistance; calculations run as ordinary browser code.
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