Defined values
(DefinedValues)


Model description

This element implements the option to use constand, flow rate independet propertes. Both, the pressure loss coefficient and the heat transfer coefficient are set to the constant values: $$\zeta=\zeta_c$$ $$\alpha=\alpha_c$$

Please be aware, that the geometric properties $l$, $V$ and $S$ are used as they are configured, without checking any conflicts. Hence, the parameters could be set s.t $S\neq l\cdot U$ and $V\neq l\cdot A$, where $U$ and $A$ are the circumference and cross sectrion area acording to the configured profile.

  1. Züst S (2017) Model Based Optimization of Internal Heat Sources in Machine Tools. ETH Diss-Nr. 24482.

Parameters

ParameterSymbolUnitDescription
PressureLossCoefficient\(\zeta_c\)-Constant pressure loss coefficient
Length\(l\)mLength of the element
Volume\(V\)m3Volume of the element
HeatTransferCoefficient\(\alpha_c\)m2 kg s-3 K-1Constant heat transfere coefficient
Surface\(S\)m2Surface area