How Good Are Tatties?

What are tatties?

Locals at Seerore near Benares were great advocates of evaporation and its "frigorific" effect.  Seerorens used tatties to keep their homes cool.  Tatties are mats of fresh green bushes or long roots.  Tatties were hung in the windows and doorways.  Their tatties were kept wet.  Air passing through would evaporate the water and cool markedly as it made its way into the house.   

Seerore's tatties seemed to work well.  Here is some data from 1792.  [In the latter part of the 18th century you could buy thermometers.  Jefferson bought his on July 4, 1776.  Recreational temperature measurement was all the rage!]

May 16 and June 7, 1792.  2 PM local time Seerore.  Hot days with westerly winds. 

  May 16  June 7
Thermometer in the sun 118° F 113° F
Thermometer in the shade   110° F 104° F
Thermometer in tattied house.  83° F  83° F

So we might ask the question, how hot could a well tattied Seeroren house get?  My guess is around 92° F (the Priestly Taylor Temperature) as at temperatures this high or higher effectively all the heat flux from the tatties would be due to latent heat and sensible heating would go to zero.

Anyway good tatties will win you some 20° F of cooling.  The price you pay for having good tatties is that you humidify the house as you cool it!

If the tatties even came close to saturating the air in the house then it would be like living in a sugarcane field in Queensland, Australia if British or perhaps on Devils Island if French.

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