Ventilation Heating Load Calculator
Calculate ventilation heating load with transparent engineering inputs and the displayed formula.
Run deterministic checks for missing or mixed units, physical bounds, detectable out-of-range values and formula applicability. This is not an engineering approval or a complete code/compliance check.
Export the current calculation inputs and outputs with formula, assumptions, confirmed source credits, automated verification status, tool version and timestamp.
PROFENG Pro unlocks calculation-record exports. The calculation itself remains free.
PROFENG provides this tool for engineering screening and educational use. Check the calculation basis, units, physical assumptions, applicable standards, safety factors, equipment data and project-specific requirements before design, procurement or operation.
Turn this result into a calculation record
Carry the tool context into the PROFENG calculation-check and record workspace without implying certification or engineering approval.
Why use this ventilation heating load calculator?
Calculate ventilation heating load with transparent engineering inputs and the displayed formula. The displayed relationship is Q = ρ cp V̇ ΔT.
What this calculation does
This calculator determines ventilation sensible load from outdoor airflow, indoor-outdoor difference, air density, specific heat. Use it for HVAC and building-services screening with transparent air, thermal or flow assumptions.
Formula and engineering variables
Q = ρ cp V̇ ΔT
| Variable | Definition | Unit | Working guidance |
|---|---|---|---|
flow | Outdoor airflow | m³/s | Illustrative screening band: 0 to about 5 m³/s. This is not a design limit. |
deltaT | Indoor-outdoor difference | K | For absolute temperature inputs, values must remain above 0 K. |
rho | Air density | kg/m³ | Illustrative screening band: 0 to about 12 kg/m³. This is not a design limit. |
cp | Specific heat | kJ/(kg·K) | Illustrative screening band: 0 to about 10.05 kJ/(kg·K). This is not a design limit. |
Ranges above are screening guidance or physical bounds where stated. They are not code limits or manufacturer ratings.
Calculated outputs
- Ventilation sensible load (kW): rho*cp*flow*deltaT
Worked example
- Outdoor airflow (flow) = 0.5 m³/s
- Indoor-outdoor difference (deltaT) = 20 K
- Air density (rho) = 1.2 kg/m³
- Specific heat (cp) = 1.005 kJ/(kg·K)
(1.2)*(1.005)*(0.5)*(20) = 12.06 kWVentilation sensible load: 12.06 kWAssumptions
- Air or fluid properties are represented by the entered values.
- The calculation represents steady operation unless the formula explicitly includes time.
- Room, duct or envelope geometry is idealized by the displayed relationship.
Limitations
- Detailed load calculations, diversity, controls, equipment curves, psychrometric state changes and local code requirements may require additional analysis.
- Final equipment selection should use manufacturer data and the applicable HVAC design method.
- A formula-level published source has not yet been confirmed for this exact implementation.
- Until the source is confirmed, use the displayed relationship only as a transparent screening implementation and independently check the method before engineering decisions.
- The displayed default values are a worked example only; replace them with traceable project or measurement data.
Formula source and acknowledgement
Source being confirmed. PROFENG has not yet approved a published source for this exact implementation, so no candidate book, paper or standard is displayed here.
Limits of use for this relationship
- A formula-level published source has not yet been confirmed for this exact implementation.
- Until the source is confirmed, use the displayed relationship only as a transparent screening implementation and independently check the method before engineering decisions.
Read the PROFENG methodology for formula sourcing and automated checks →
How to use it
Start with the inputs shown above, review the assumptions or options, then generate the result. Where the tool creates a file, keep the original until you have opened and checked the downloaded output.
Frequently asked questions
What does Ventilation Heating Load Calculator calculate?
This calculator determines ventilation sensible load from outdoor airflow, indoor-outdoor difference, air density, specific heat. Use it for HVAC and building-services screening with transparent air, thermal or flow assumptions.
What formula does Ventilation Heating Load Calculator use?
The calculator uses Q = ρ cp V̇ ΔT. Every input used by the implementation is listed in the variable table on this page.
How is the worked example for Ventilation Heating Load Calculator checked?
PROFENG substitutes the displayed default values into the implemented relationship and compares the result against automated verification cases where an independent verifier is available.
What assumptions matter most for Ventilation Heating Load Calculator?
Air or fluid properties are represented by the entered values. The calculation represents steady operation unless the formula explicitly includes time. Room, duct or envelope geometry is idealized by the displayed relationship.
Can I use this result for final design or procurement?
Use it as an engineering screening calculation. Final design, procurement, operation or compliance decisions require project-specific data and the applicable engineering method, standard or manufacturer information.
QA, changelog and corrections
Last QA update: 30 September 2026.
Automated verification passed – 30 September 2026 – six numerical cases checked, with dimensional checks, independent cross-checks for calculators, and unit round-trip checks for converters where applicable.
Changelog
30 September 2026 – source/indexation status, metadata and correction pathway reviewed. Engineering tools display the automated verification label only when they are inside the passing Part 3 verification scope.