Counterflow HX with Crossflow Headers
The function provides the effectiveness of a counterflow heat exchanger that has cross-flow headers. The solution is obtained using the method suggested by Kays et al. (1968) in which a counterflow heat exchanger is placed in series with a cross-flow (both fluids unmixed) heat exchanger.
Inputs:
NTU_co number of transfer units in the counterflow region, UA_co/C_min (-)
NTU_cr number of transfer units in the crossflow region, UA_cr/C_min (-)
CR Capacitance ratio - C_min/C_max (-)
Outputs:
eff total effectiveness of the heat exchanger
Example:
NTU_co=5
NTU_cr=2
CR=0.9
eff=hx_cof_crfhdr(NTU_co, NTU_cr, CR)
{Solution:
eff=0.9039
}