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Keywords: Life Estimation, Wet Cooling, Evaporative Cooling
In Evaporative Cooling applications, calcium scale buildups can largely affect saturation effectiveness, and consequently, the life of the rigid wet cooling media. Performing Accelerated Degradation Tests on cellulose media has helped us understand the mechanism behind the scale buildup and draw an empirical relation between parameters like conductivity of the sump water and pressure drop across the media pads, and the corresponding calcium depositions on the pads. However, a number of such industrial applications tend to recirculate the sump water during the wetting cycles, thereby increasing the concentration of dissolved salts and further facilitating the process of scale buildup on the media pads. In such cases, introducing a water bleed system in the apparatus can help get rid of a large portion of the minerals as they accumulate, thus extending the life of the media pads. This presentation provides a summary of the literature review, and the results of the Accelerated Degradation Test, while predicting the effect of a water bleed system on the life of the wet cooling media. The apparatus employed in this experiment is an airflow bench, a section in between the inlet and outlet ducts of the bench for the placement of the media pads, a sump, a pump in the sump, water distribution headers, a water reservoir, and an external pump. At first, ADT will be carried out on an unmodified apparatus. Afterwards, a water bleed system will be introduced in the sump, and ADT will be carried out again. Performance criteria like sump water conductivity, pressure drop across the pads, and physical calcium depositions on the pad will be monitored and compared for both the scenarios. Based on this comparison, the life extension of the media pads can be predicted.
Shriya Prasad Joshi,
University of Texas at Arlington
Arlington, TX

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