Hot water can in fact freeze faster than cold water for a wide range of experimental conditions. This phenomenon is extremely counter- intuitive, and surprising even to most scientists, but it is in fact real. It has been seen and studied in numerous experiments. While this phenomenon has been known for centuries, and was described by Aristotle, Bacon, and Descartes, it was not introduced to the modern scientific community until 1969, by a Tanzanian high school student named Mpemba.

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Recently going through some blog articles, I found the use of low flush toilets where water can be saved by more than 50%. Amazed by numbers, I thought to work out my self these numbers with ref to India & possible quantum of savings.

Therefore, my search began on this issue & found that technologies are available which can reduce the consumption to more than 80-90% and is totally developed indeginously by Indians. We do not realize the importance of any small change unless we see its impact in totality which may be very useful for the nation as a whole

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This is in continuation of my previous post on this topic. In this part, I will explain the calculation of NTU for cooling towers, yes NTU which is very important & is similar to NTU in absorption towers. It helps in indentifying the performance, capacity & effciiency of your cooling tower. In next part of this post I will explain How to use these calculations for mesurement of efficiencies, prediction for new conditions etc .

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