Part 4: Using the RDPI to Optimize Evaporative Cooler Water Usage ﾖ A Case Study
By Daniel J. Robinette, P.E.
In Parts 1 through 3 of this article series, a new tool for determining the amount of mineral precipitate that will form within industrial water-process equipment was introduced. This new tool is known as the Robinette Dynamic Precipitation Indicator (RDPI) and offers several advantages over the use of traditional scaling indices and saturation ratios. The new tool provides quantitative results by calculating the mass per unit time of mineral precipitates that will form under various operating conditions and system configurations. The calculations are driven by a series of algorithms that include built-in equilibrium and kinetic models. As described in Part 2 of this series (January 2011 issue), there are two approaches for developing RDPIsﾗ experimental and classical. The experimental approach was used to develop an RDPI for Tricalcium Phosphate (RDPI-TcP). The classical approach, described in Part 3 of this series (May 2011 issue) was used to develop an RDPI for Calcium Carbonate (RDPI-CC). Both of these tools will be demonstrated in this Part 4 case study.
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