Saturday, July 07, 2012
Having mentally undressed all the attractive girls sunbathing poolside (most are almost naked anyway), my mind wandered to the conundrum why the large pool's water is cooler than the shallow childrens pool. The pools lose energy (heat) by evaporating water, and the surface/mass ratio is higher in the shallow pool, so it should be cooler. Yet the opposite is true. The shallow children's pool is warmer and stinks of piss. May the heat contribution of the urine (36 degrees Celsius) cause the temperature paradox?
Yes. In the early morning, after a night of irradiating long wave energy and no hot piss additions, the shallow pool is cooler than the deep one. Yet around 0900 AM the relation reverses itself, and the children's pool becomes a warm nitrification reactor. Also the fact that the deep pool's volume is about 800 cu.m. vs 50 cu m of the children's pool affects the rate of temperature change. Next time I'll calculate the denitrication rate at different chlorine concentrations.