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.

Devordagi issiqlik yo'qotishi qanday hisoblanadi?

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.

Devorlarning odatiy U-qiymatlari qancha?

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.

Sirt parda qarshiliklari nima?

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.

Muhandislik uchun bepul vosita

Devor Orqali Issiqlik Yo'qolishi Kalkulyatori

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

—

Kompozit devorning issiqlik o'tkazuvchanligi

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

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