engleski

General Mathematical Model of Evaporative Cooling Devices

In this paper a general nondimensional mathematical model for the description of all types of evaporative cooling devices in today's use (water cooling towers, evaporative condensers and evaporative fluid coolers, air washers, dehumidifying coils etc.) is presented. The system of differential equations describing nonadiabatic evaporation processes is transformed to a pure nondimensional form by the introduction of nondimensional coordinates and parameters and by the substitution of straight air saturation line instead of the real one. In such a way, not only the description of the entire process becomes very simple, but also the overall performance of any such device can be expressed in terms of only few parameters and presented in one or few diagrams. This nondimensional model forms a basis for simple and rather accurate methods for rating various types of evaporative cooling devices. For every type of device, a unique rating procedure can be established, irrespective of the relative flow direction of the fluids involved, what is very convenient when crossflow devices are considered. Since every particular type of evaporative device deserves considerable attention, the application of this general model to various evaporative devices, together with the resulting rating procedure and accuracy test will be presented in detail in the follow-on papers, each devoted to one particular type.

heat transfer; mass transfer; nonadiabatis evaporation; nondimensional mathematical model; evaporative condenser; evaporative fluid cooler; water cooling tower

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