Q ₁₀₀

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Basic sketch of a heat exchanger

Q ₁₀₀ indicates the performance of a heat exchanger with a defined mass flow of air and volume flow of coolant as well as a temperature difference between the incoming material flows of 100  Kelvin ; z. B.

${\displaystyle \vartheta _{\text{Lufteintritt}}=-20\,\mathrm {^{\circ }C} }$

${\displaystyle \vartheta _{\text{Kühlmitteleintritt}}=+80\,\mathrm {^{\circ }C} }$

Correspondingly, the temperature difference for Q _{80 is} 80 Kelvin and for Q _{60 it is} 60 Kelvin.

This standardized value can be used to calculate the current output of the heat exchanger with the same mass and volume flows and different inlet temperatures - e.g. B. during a test drive with changing coolant or air inlet temperatures:

${\displaystyle {\dot {Q}}_{\rm {W{\ddot {U}}T}}={\dot {Q}}_{100}\cdot {\frac {\vartheta _{\rm {K{\ddot {u}}hlmittel}}-\vartheta _{\rm {Lufteintritt}}}{100}}}$

Q ₁₀₀ can also be determined as a map as a function of different mass flows .