Tuesday, August 20, 2019

Humidification for rain

This triangular cloth-covered framework device shown will deflect a huge volume of air into the almost saturated layer just above the sea during the course of a day and will facilitate the evaporation of spray above the surface by creating turbulence with the downwards direction of the air. Just before a sea breeze develops (breeze from sea to land) the air that is being warmed on land expands upwards and outwards, keeping the sea breeze from developing. Warm dry air from this expanded volume of air will be mixed, by this device, into the spray and almost-saturated air region just above the sea just before the sea breeze develops. A deeper moist layer will then blow in with the sea breeze, facilitating rain.
If the spray was just rising a few cm without the device and is forced a few m upwards by the wind with the device there will be a big increase in evaporation. If a few cubic km of air per day is directed down by the device you will have a huge amount of moist air. Imagine the device is 1 km long, 1/100 km high and wind blows at 10 km/hour for 20 hours. Then 2 cubic km of air per day could be forced down.
When there is a drought the land gets hotter because of no evaporation (hot deserts are hotter than tropical forests where there is evaporation). When land gets hotter the air above the land gets hotter and then relative humidity of the air drops and the vapour pressure deficit (VPD) increases a lot. From what I have read plants generally like a vapour pressure deficit (VPD) of between 0.8 kPa and 1.2 kPa. This means that the vapour pressure inside the plant minus the vapour pressure in the air should be 0.8 to 1.2 kPa. Failing this there is wilting, etc. Even if you do not get rain it might be worthwhile humidifying the air around the coast or planting more trees



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