Last post we talked about the psychrometric chart and the process that moist air follows on the chart when it is cooled until condensation begins. You may be familiar with cooling systems that are variously termed “evaporative coolers”, “swamp coolers”, “desert coolers” and other names. These systems work on something sort of like the inverse of the condensation process that we talked about last time. Instead of cooling the moist air until liquid water condenses out, these systems evaporate liquid water into the air in order to cool it.
