To calculate the heat dissipation of a 100-square-meter house at -15°C, several factors need to be considered, including the insulation performance of the house, materials, insulation, indoor temperature, and ambient temperature.
Typically, calculating the exact amount of heat dissipated in a house is a complex process that takes into account multiple heat transfer methods such as heat conduction, convection, and radiation in the building. However, it can be estimated by some approximations.
One way to estimate the amount of heat dissipated is to use the heat loss factor. The heat loss coefficient (U-value) is an index used to measure the thermal insulation performance of a building, and the unit is w (m ·k), which indicates the amount of heat dissipation per square meter of house under the unit temperature difference.
Suppose the 100 square meter house has good thermal insulation performance, the U value is 2 W (m ·k), and the temperature difference is -15°C (i.e. the difference between the ambient temperature and the indoor temperature is 15°C).
Heat dissipation = u-value of the surface area of the house Temperature difference.
Heat dissipation = 2 W (m·k) 100 m 15 k = 3000 watts (or 3 kilowatts).
The results of this estimate show that under these conditions, the 100-square-meter house would lose approximately 3,000 watts of heat per hour at -15°C.
Please note that this value is an approximate value, and the actual amount of heat dissipated will be affected by a variety of factors, such as the building structure, insulation, climatic conditions, and materials used. Therefore, this estimate is for reference only.
The thermal conductivity coefficient (often expressed as w (m ·k)) is a measure of the thermal conductivity of a material. In the field of construction, it is often referred to as the thermal conductivity or heat transfer coefficient and is used to measure the thermal conductivity of a material per unit thickness.
The unit of w (m ·k) can be interpreted as:
w stands for watts (unit power, i.e., the amount of heat conducted per unit of time).
Square metre. k stands for Kelvin temperature (temperature difference).
Thus, 2 W (m·k) represents the amount of heat that the material conducts 2 watts of heat per square meter of surface area per unit temperature difference. The lower this number, the better the insulation performance of the material, as it means that the material is able to conduct less heat per unit temperature difference.