Abstract
This paper presents a numerical method for determining heat transfer
coefficients in cross-flow heat exchangers with extended heat exchange
surfaces. Coefficients in the correlations defining heat transfer on the
liquid- and air-side were determined using a nonlinear regression method.
Correlation coefficients were determined from the condition that the sum
of squared liquid and air temperature differences at the heat exchanger
outlet, obtained by measurements and those calculated, achieved minimum.
Minimum of the sum of the squares was found using the Levenberg-Marquardt
method. The uncertainty in estimated parameters was determined using the
error propagation rule by Gauss. The outlet temperature of the liquid and
air leaving the heat exchanger was calculated using the analytical model
of the heat exchanger.
Go to article