Heat Loss Calculator

Heat Loss Calculator:

Enter the values of heat transfer coefficient, U_(W/m2.K), surface area, A_(m2) and temperature difference,ΔT_(°C) to determine the value of Heat loss, q_(W).

Enter Heat Transfer Coefficient:		W/m2.K
Enter Surface Area:		m2
Enter Temperature:		°C
Result – Heat Loss:		W

Heat Loss Formula:

Heat loss refers to the transfer of thermal energy from a warmer object or system to a cooler surrounding environment. This process is crucial in engineering, construction, and energy efficiency studies, particularly in designing building insulation, heating systems, and industrial equipment. Heat loss occurs due to conduction, convection, and radiation.

In buildings, walls, roofs, windows, and floors are typical pathways for heat loss. The heat loss rate is influenced by the thermal conductivity of materials, surface area exposed, temperature difference across the material, and the overall heat transfer coefficient (U-value).

The U-value represents the amount of heat transferred per unit area per unit temperature difference, while ΔT (temperature difference) represents the driving force for heat flow. By minimizing the U-value and reducing exposed surface areas, heat loss can be controlled effectively.

The formula for heat loss accounts for these factors and helps in estimating the total heat transfer. Accurate calculations are vital for designing efficient systems and reducing energy consumption.

Heat loss, q_(W) in Watts equals the product of the overall heat transfer coefficient, U_(W/m2.K) in Watts per square metres Kelvin, the surface area, A_(m2) in square metres and the temperature difference, ΔT_(°C) in degree Celsius.

Heat loss, q_(W) =  U_(W/m2.K) * A_(m2) * ΔT_(°C)

q_(W) = heat loss in Watts, W.

U_(W/m2.K) = heat transfer coefficient in Watts per square metres Kelvin, W/m².K.

A_(m2) = surface area in square metres, m².

ΔT_(°C) = temperature in degree Celsius, °C.

Heat Loss Calculation:

1. A wall with a surface area of 50 m², a U-value of 0.25 W/m².K and a temperature difference of 20°C between the interior and exterior is analyzed for heat loss.

Given:U_(W/m2.K) = 0.25 W/m².K, A_(m2) = 50 m², ΔT_(°C) =  20°C.

Heat loss, q_(W) =  U_(W/m2.K) * A_(m2) * ΔT_(°C)

q_(W) = 0.25 * 50 * 20

q_(W) =  250W.

2. A building’s roof with a U-value of 0.15 W/m².K and an area of 80 m², loses 480 W of heat. Calculate the temperature difference.

Given:U_(W/m2.K) = 0.15 W/m².K, A_(m2) = 80 m², q_(W) =  480W.

Heat loss, q_(W) =  U_(W/m2.K) * A_(m2) * ΔT_(°C)

ΔT_(°C) = q_(W) /  U_(W/m2.K) * A_(m2) *

ΔT_(°C) =  480 / 0.15 * 80

ΔT_(°C) =  480 / 12

ΔT_(°C) = 40°C.