Walvis Bay 28 Aug 2019, 15:00

Walvis Bay, Wednesday 28 August 2019 at 15:00.
T=18 deg C and RH=58%. Atmospheric pressure is assumed to be 101.325 kPa. 
With evaporative cooling of 30% efficiency the air will be cooled to 16.57 deg C. 
RH after evaporative cooling will be 68.48%. 
Using Espy's equation for lifted condensation (LCL):
LCL before evaporative cooling is 1047 m
LCL after evaporative cooling is 727 m.
The mass of water required to do the evaporative cooling is 711 tonnes per cubic km.
Dew Point:
Dew point before evaporative cooling is 9.62 deg C
Dew point after evaporative cooling is 10.75 deg C
Danger of fire. The greater the Chandler Burning Index the greater the danger of fire:
Before evaporative cooling: Chandler burning index is 10.75 (fire is unlikely)
After evaporative cooling: Chandler burning index is 4.29 (fire is unlikely
Saturated adiabatic lapse rate (SALR):
Before evaporative cooling initial SALR is 5.327 deg C per km rise.
After evaporative cooling initial SALR is 5.215 deg C per km rise.
Absolute humidity:
Before evaporative cooling the absolute humidity is 8.909 grams of water vapour per cubic metre.
After evaporative cooling the absolute humidity is 9.657 grams of water vapour per cubic metre.
Discomfort Index (DI). Above 110 is hazardous to health.:
Before evaporative cooling the DI is 70.4
After evaporative cooling the DI is 68.5
Water from air from condensation by cooling air:
Before evaporative cooling you can get 0.479 kg of water per kWh of cooling
After evaporative cooling you can get 0.556 kg of water per kWh of cooling
Vapour pressure deficit (VPD). Usually VPD should be between 0.45 kPa and 1.25 kPa:
Before evaporative cooling VPD is 0.867 kPa
After evaporative cooling VPD is 0.594 kPa