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Appendix 11.5 Derivation of Heat Re-circulation FactorEnvironmental Impact Assessment • September 14th, 2021
It is assumed that all cooling water discharges have an excess temperature with reference to the ambient water temperature. The value of excess temperature will be based on the design temperature load for the proposed cooling system. Theoretically, the potential short circuit problem of the recirculation of heated water to the cooling water intake should be taken into account by conducting a series of model runs. The first run should be simulated with an excess temperature specified at the spent cooling water outfalls and the second run should be simulated with the specified excess temperature plus the temperature elevation at the intakes predicted in the first-run. More simulations should be iterated with the temperature elevation at the intakes plus temperature at the outfall to reproduce the potential build-up of heat recirculation, until the results converge. Assuming that the temperature elevation at intake is proportional to that at cooling water discharge, the temperature elevat
