Heat Flux, or density of heat flow rate, is a quantity to express the amount of heat transferred in a unit time per unit area. The SI unit of heat flux watt per square meter (symbol W/m²).

Specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius. The SI for specific heat is joule per kilogram kelvin (symbol J/(kg·K)).

Thermal conductivity is the quantity of heat transferred per unit time through a surface of unit area due to the exist of certain temperature gradient. The SI unit is watt per meter kelvin (symbol W/(m·K).

The overall heat transfer coefficient describes the rate of heat transfer in the heat exchanger. It expresses the amount of heat which passes through a unit area of a medium or system in a unit time when the temperature difference between the surface and surrounding medium is 1 degree. The SI unit is watt per square meter kelvin (symbol W/(m²·K).

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