soojusülekandearvu

Soojusülekandearv, also known as the heat transfer coefficient or convective heat transfer coefficient, is a crucial parameter in thermodynamics and heat transfer engineering. It quantifies the rate at which heat is transferred between a surface and a fluid (liquid or gas) due to convection. The value of the soojusülekandearv depends on various factors, including the properties of the fluid, the flow regime (laminar or turbulent), the geometry of the surface, and the temperature difference between the surface and the fluid.

Mathematically, the soojusülekandearv is defined by Newton's law of cooling, which states that the rate of heat transfer (Q) is proportional to the surface area (A), the temperature difference (ΔT) between the surface and the fluid, and the soojusülekandearv (h). The formula is expressed as Q = h * A * ΔT. The units of soojusülekandearv are typically Watts per square meter per Kelvin (W/(m²·K)) or Watts per square meter per degree Celsius (W/(m²·°C)).

A higher soojusülekandearv indicates a more efficient transfer of heat. This parameter is essential for designing heat exchangers, cooling systems, and heating equipment. Engineers use it to predict how quickly a fluid will heat up or cool down, or how much heat will be lost or gained from a system. Understanding and accurately determining the soojusülekandearv allows for optimized performance and energy efficiency in numerous applications.