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Control of the rate of heat flow in a compact heat exchanger by changing the speed of fan rotation

Taler D.

Archives of Thermodynamics

2009

Vol. 30, no. 4

67-80

The aim of the steady-state inverse heat transfer problem for plate-fin and tube heat exchangers is to adjust the number of fan revolutions per minute so that the water temperature at the heat exchanger outlet is equal to a preset value. Since the outlet water temperature is a nonlinear function of the fan revolution number, a nonlinear algebraic equation was solved using the secant or interval searching method. The steady-state outlet water temperature was calculated at every search or iteration step using an analytical mathematical model of the heat exchanger. An analytical model of the plate-fin and tube heat exchanger with two tube rows and two passes allowing for different heat transfer coefficients on each tube row was developed. The procedure developed in the paper was validated by comparing the calculated and measured values of the fan revolutions. The calculated numbers of fan revolutions compare closely with the measured values.