# How is heat sink performance measured?

## How is heat sink performance measured?

One should be placed in the flow of the inlet air to measure the temperature of the ambient air. A small hole is drilled into the middle of the heat sink base and a thermocouple is placed inside of it to measure the base temperature of the heat sink….Calculations:

parameter
fin height (m) 2.00e-2

Is higher or lower thermal resistance better?

Thermal resistance is calculated by dividing the thickness of the material by its thermal conductivity, giving an R-value specific to that thickness. As a rule of thumb, the higher the thermal resistance the better, because there is a greater resistance to heat transfer.

### Do you want a high or low thermal resistance?

The R-value is a measure of resistance to heat flow through a given thickness of material. So the higher the R-value, the more thermal resistance the material has and therefore the better its insulating properties.

How much heatsink do I need?

When it comes to applying thermal paste, less is more: a small, pea-sized drop is all you need. Don’t spread it around, either—the heatsink will spread it out evenly as you screw it in.

#### How to determine the optimal parallel plate fin heat sink?

Parallel plate fin heat sink configuration. In order to select the appropriate heat sink, the thermal designer must first determine the maximum allowable heat sink thermal resistance.

How does fin height affect the heat sink?

Effect of fin height and number of fins on heat sink thermal resistance at an air velocity of 2.5 m/s (492 fpm). Figure 3. Effect of fin height and number of fins on heat sink thermal resistance at a volumetric air flow rate of 0.0024 m 3 /s (5 CFM).

## How is the thermal resistance of a heat sink calculated?

To select a heat sink, firstly thermal resistance of the heating circuit is calculated. The mathematically thermal resistance of a body is equal to the ratio of temperature difference and heat generated. R = Thermal resistance (°C/W), Q = Generated heat (watt), (T2-T1) = Difference in temperature. Calculation of Thermal resistance in series

What does RJC stand for in heat sink?

Rja : Junction to air thermal resistance. Rjc : Junction to chip thermal resistance. Rch : Chip to heat sink (Interface material) thermal resistance. Rha : Heat sink to air thermal resistance.