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Heat Loss Calculator

U-Value (W/m²K)

Plocha (m²)

Temperature Difference (K)

What is Heat Loss Calculator?

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Heat loss calculation determines heating requirements based on insulation, air leakage, and temperature difference. Critical for system sizing.

DigiCalcs delivers precision-engineered tools for engineers and STEM professionals.

Vzorec

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f(x)Conductive loss: Q = U × A × ΔT (sum all surfaces)

Variable Legend

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Symbol	Meno	Jednotka	Popis
Q	1	—	1
U	U value	—	Variable used in the calculation
A	A value	—	Variable used in the calculation

How to Heat Loss Calculator

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1Conductive loss: Q = U × A × ΔT (sum all surfaces)
2Infiltration loss: Q = 1.08 × CFM × ΔT × air density
3Total loss drives heating system size

Worked Examples

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Example 1

Given:House 200 m², U-avg 0.5, ΔT 20K, 500 CFM infiltration

Výsledok:Total loss ~12 kW (heating system needed)

Detailed calc required

Real-World Applications

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HVAC system design and energy efficiency modelling

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Industrial process engineering and materials science

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Climate science and atmospheric physics research

Frequently Asked Questions

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Why is air sealing important?

Infiltration loss often exceeds conductive loss; air sealing improves efficiency more than adding insulation.

Does orientation affect heat loss?

Indirectly; south-facing gains solar heat. Window orientation matters more than walls.

Common Mistakes to Avoid

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!Neglecting infiltration (often 30-50% of total loss)
!Using design temperature without seasonal variation

References

›Heat Loss — Wikipedia

📖Difficulty:Intermediate

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Reviewed October 2026

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