Example 6.4 Output from an ideal solar still
The insolation in a dry sunny area is typically 20MJm−2 day−1. The
latent heat of evaporation of water is 24MJkg−1. Therefore if all the
solar heat absorbed by the evaporation, and all the evaporated water,
is collected, the output from the still is
20MJm−2 day−1
24MJkg−1
= 83 kg day−1m−2