No.3 Evaluation & measurement

I report an effect of the fog cooling this time. According to various reports, the cooling effect by the fog seems to be able to cool around 3-5 degrees than ambient temperature. By this experiment, it was confirmed. But temperature greatly rises on sunny and hot day in summer. For example, it is not unusual to become more than 40 degrees on urban asphalt street though the ambient temperature is still 30 degrees.

The next photographs show a result of the temperature change measurement performed at 9:30 AM on July 31st, 2005. The sunlight of the summer was quite shiny in southern front of my home facing to a parking lot. The ambient temperature of the morning was around 29 degrees, but the temperature under the sunshine easily exceeded 30 degrees because the weather was so nice.

******Before cooling****** *******After cooling*******

On the left photograph, the red part indicates it was strongly lighted and reached around 33 degrees. The yellow part shows it was shadowed by my neighbor's house, but still reached 29 degrees as well as the ambient temperature. Although my plants prevented the heat, after all the inside of the room became hot by radiant heat.

The right photograph shows measurement result after cooling with fog for 20 minutes. It cooled 3-4 degrees down and the temperature became 27-28 degrees around the trees. It also reached to 25-26 degrees on the ground under the trees. The photos don't clearly show because covered with a tree, but the temperature was 27.5 degrees in the living room behind the trees then. I could feel coolly if blowing soft wind.

The shower heads were installed on a tree branch in the middle of the photo and on a house wall behind the trees. The mists flew around my house with evaporating at the most direction of wind rather than wetting the trees. I installed one more shower head in the east side, then the whole house cooled down considerably if all ran at the same time.

By the way, I could easily measure temperature in the high place because I used a radiation thermometer. But I sequentially measured points where I defined beforehand because it could not widely measure. Because the photographs were composed from the data, there may be some errors.

I will report about the effect of the tree next time.