Duct Heat Loss Calculator

Formula

The formula to calculate the Duct Heat Loss (Q) is:

\[ \text{Q} = \text{A} \cdot \text{U} \cdot \Delta \text{T} \]

Where:

\( \text{Q} \) is the duct heat loss (W)
\( \text{A} \) is the surface area of the duct (m²)
\( \text{U} \) is the heat transfer coefficient (W/m²K)
\( \Delta \text{T} \) is the temperature difference between the inside and outside of the duct (°C)

What is Duct Heat Loss?

Duct heat loss refers to the loss of heat from the air as it travels through the ductwork in a heating, ventilation, and air conditioning (HVAC) system. This loss occurs due to the temperature difference between the air inside the duct and the surrounding environment. The heat is transferred through the duct walls to the outside environment, leading to a decrease in the temperature of the air being delivered to the conditioned space. Proper insulation and sealing of ductwork can help minimize duct heat loss and improve the efficiency of the HVAC system.

Example Calculation

Let's assume the following values:

Surface Area of the Duct (A) = 50 m²
Heat Transfer Coefficient (U) = 0.5 W/m²K
Temperature Difference (ΔT) = 20 °C

Using the formula to calculate the Duct Heat Loss:

\[ \text{Q} = 50 \text{ m}^2 \cdot 0.5 \text{ W/m}^2\text{K} \cdot 20 \text{ °C} = 500 \text{ W} \]

The Duct Heat Loss (Q) is 500 W.