## Fundamental of Heat Transfer

Heat transfer (or heat) is energy in transit due to a temperature difference. When there is a temperature difference in a medium or between media, heat transfer occurs. There are different type of heat transfer process, Conduction), Convection and Thermal radiation.

When a temperature gradient exists in a stationary medium, the heat transits from higher temperature to… |
Convection heat transfer occurs between a surface and a moving fluid (liquid or gas) when they are at different temperatures… |

Thermal radiation is energy emitted by matter that is at a finite temperature via electromagnetic waves… |
Thermal resistance (Rth) is an important concept and index to heat transfer calculation and product development… |

Each fan gets a characteristic curve, also known as P-Q curve, which indicates the correlation between fan air flow rate and static pressure… |
When fluid passes through a system or an object with flow impedance and pressure loss, the correlation between pressure loss and flow rate is obtained as system impedance curve… |