U-value (thermal transmittance) is the rate of heat transfer through a structure per unit area per degree of temperature difference. Lower U = better insulation. Units: W/(m²·K). U = 1/R_total.

Kako se izračunava gubitak toplote kroz zid?

Q = U × A × ΔT, where Q is heat flow (W), U is thermal transmittance (W/m²K), A is wall area (m²), and ΔT is temperature difference between inside and outside.

R-value is thermal resistance: R = thickness/conductivity for each layer. Total R = R_si + ΣR_layers + R_se (including surface film resistances). U = 1/R_total. Higher R = better insulation.

Koje su tipične U-vrednosti zidova?

Uninsulated brick wall: U ≈ 2.0 W/m²K. Insulated cavity wall: U ≈ 0.3-0.5 W/m²K. Well-insulated wall (modern code): U ≈ 0.15-0.25 W/m²K. Passive house: U < 0.15 W/m²K.

Šta su otpornosti površinskog filma?

R_si (internal surface) ≈ 0.13 m²K/W and R_se (external surface) ≈ 0.04 m²K/W account for the thin boundary layer of still air at each surface. They are included in the total thermal resistance calculation.

Besplatan Inženjerski Alat

Kalkulator gubitka topline kroz zid

Calculate heat loss Q = U × A × ΔT through composite walls. Add material layers, set temperatures, and get U-value and heat flow.

Q = U·A·ΔTMulti-Layer#176

Results

Heat Loss Q

—

U-Value

—

Total R-Value

—

Heat Flux q

—

Prijenos Topline Kroz Kompozitni Zid

R_si = 0.13 m²K/W (internal surface), R_se = 0.04 m²K/W (external surface).

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